repmgrd: fix upstream role check

Only take action if it's confirmed as a standby.

FAQ.md

@@ -1,9 +1,7 @@
 FAQ - Frequently Asked Questions about repmgr
 =============================================
 
-The repmgr 4 FAQ is located here:
-
-    https://repmgr.org/docs/appendix-faq.html
+The repmgr 4 FAQ is located here: [repmgr FAQ (Frequently Asked Questions)](https://repmgr.org/docs/4.0/appendix-faq.html "repmgr FAQ")
 
 The repmgr 3.x FAQ can be found here:
 

HISTORY

@@ -1,4 +1,104 @@
-4.0.4   2018-03-08
+4.2.0   2018-??-??
+        repmgr: add parameter "shutdown_check_timeout" for use by "standby switchover";
+          GitHub #504 (Ian)
+        repmgr: add "--node-id" option to "repmgr cluster cleanup"; GitHub #493 (Ian)
+        repmgr: report unreachable nodes when running "repmgr cluster (matrix|crosscheck);
+          GitHub #246 (Ian)
+        repmgr: add configuration file parameter "repmgr_bindir"; GitHub #246 (Ian)
+        repmgr: fix "Missing replication slots" label in "node check"; GitHub #507 (Ian)
+        repmgrd: fix parsing of -d/--daemonize option (Ian)
+        repmgrd: support "pausing" of repmgrd (Ian)
+
+4.1.1   2018-09-05
+        logging: explicitly log the text of failed queries as ERRORs to
+          assist logfile analysis; GitHub #498
+        repmgr: truncate version string, if necessary; GitHub #490 (Ian)
+        repmgr: improve messages emitted during "standby promote" (Ian)
+        repmgr: "standby clone" - don't copy external config files in --dry-run
+          mode; GitHub #491 (Ian)
+        repmgr: add "cluster_cleanup" event; GitHub #492 (Ian)
+        repmgr: (standby switchover) improve detection of free walsenders;
+          GitHub #495 (Ian)
+        repmgr: (node rejoin) improve replication slot handling; GitHub #499 (Ian)
+        repmgrd: ensure that sending SIGHUP always results in the log file
+          being reopened; GitHub #485 (Ian)
+        repmgrd: report version number *after* logger initialisation; GitHub #487 (Ian)
+        repmgrd: fix startup on witness node when local data is stale; GitHub #488/#489 (Ian)
+        repmgrd: improve cascaded standby failover handling; GitHub #480 (Ian)
+        repmgrd: improve reconnection handling (Ian)
+
+4.1.0   2018-07-31
+        repmgr: change default log_level to INFO, add documentation; GitHub #470 (Ian)
+        repmgr: add "--missing-slots" check to "repmgr node check" (Ian)
+        repmgr: improve command line error handling; GitHub #464 (Ian)
+        repmgr: fix "standby register --wait-sync" when no timeout provided (Ian)
+        repmgr: "cluster show" returns non-zero value if an issue encountered;
+          GitHub #456 (Ian)
+        repmgr: "node check" and "node status" returns non-zero value if an issue
+           encountered (Ian)
+        repmgr: add CSV output mode to "cluster event"; GitHub #471 (Ian)
+        repmgr: add -q/--quiet option to suppress non-error output; GitHub #468 (Ian)
+        repmgr: "node status" returns non-zero value if an issue encountered (Ian)
+        repmgr: enable "recovery_min_apply_delay" to be 0; GitHub #448 (Ian)
+        repmgr: "cluster cleanup" - add missing help options; GitHub #461/#462 (gclough)
+        repmgr: ensure witness node follows new primary after switchover;
+          GitHub #453 (Ian)
+        repmgr: fix witness node handling in "node check"/"node status";
+          GitHub #451 (Ian)
+        repmgr: fix "primary_slot_name" when using "standby clone" with --recovery-conf-only;
+          GitHub #474 (Ian)
+        repmgr: don't perform a switchover if an exclusive backup is running;
+          GitHub #476 (Martín)
+        repmgr: enable "witness unregister" to be run on any node; GitHub #472 (Ian)
+        repmgrd: create a PID file by default; GitHub #457 (Ian)
+        repmgrd: daemonize process by default; GitHub #458 (Ian)
+
+4.0.6   2018-06-14
+        repmgr: (witness register) prevent registration of a witness server with the
+          same name as an existing node (Ian)
+        repmgr: (standby follow) check node has actually connected to new primary
+          before reporting success; GitHub #444 (Ian)
+        repmgr: (standby clone) improve handling of external configuration file copying,
+          including consideration in --dry-run check; GitHub #443 (Ian)
+        repmgr: (standby clone) don't require presence of "user" parameter in
+          conninfo string; GitHub #437 (Ian)
+        repmgr: (standby clone) improve documentation of --recovery-conf-only
+          mode; GitHub #438 (Ian)
+        repmgr: (node rejoin) fix bug when parsing --config-files parameter;
+          GitHub #442 (Ian)
+        repmgr: when using --dry-run, force log level to INFO to ensure output
+          will always be displayed; GitHub #441 (Ian)
+        repmgr: (cluster matrix/crosscheck) return non-zero exit code if node
+           connection issues detected; GitHub #447 (Ian)
+        repmgrd: ensure local node is counted as quorum member; GitHub #439 (Ian)
+
+4.0.5   2018-05-02
+        repmgr: poll demoted primary after restart as a standby during a
+          switchover operation; GitHub #408 (Ian)
+        repmgr: add configuration parameter "config_directory"; GitHub #424 (Ian)
+        repmgr: add "dbname=replication" to all replication connection strings;
+          GitHub #421 (Ian)
+        repmgr: add sanity check if --upstream-node-id not supplied when executing
+          "standby register"; GitHub #395 (Ian)
+        repmgr: enable provision of "archive_cleanup_command" in recovery.conf;
+          GitHub #416 (Ian)
+        repmgr: actively check for node to rejoin cluster; GitHub #415 (Ian)
+        repmgr: enable pg_rewind to be used with PostgreSQL 9.3/9.4; GitHub #413 (Ian)
+        repmgr: fix minimum accepted value for "degraded_monitoring_timeout";
+          GitHub #411 (Ian)
+        repmgr: fix superuser password handling; GitHub #400 (Ian)
+        repmgr: fix parsing of "archive_ready_critical" configuration file
+          parameter; GitHub #426 (Ian)
+        repmgr: fix display of conninfo parsing error messages (Ian)
+        repmgr: fix "repmgr cluster crosscheck" output; GitHub #389 (Ian)
+        repmgrd: prevent standby connection handle from going stale (Ian)
+        repmgrd: fix memory leaks in witness code; GitHub #402 (AndrzejNowicki, Martín)
+        repmgrd: handle "pg_ctl promote" timeout; GitHub #425 (Ian)
+        repmgrd: handle failover situation with only two nodes in the primary
+          location, and at least one node in another location; GitHub #407 (Ian)
+        repmgrd: set "connect_timeout=2" when pinging a server (Ian)
+
+4.0.4   2018-03-09
         repmgr: add "standby clone --recovery-conf-only" option; GitHub #382 (Ian)
         repmgr: make "standby promote" timeout values configurable; GitHub #387 (Ian)
         repmgr: improve replication slot warnings generated by "node status";

Makefile.in

@@ -11,7 +11,11 @@ EXTENSION = repmgr
 
 DATA = \
   repmgr--unpackaged--4.0.sql \
-  repmgr--4.0.sql
+  repmgr--4.0.sql \
+  repmgr--4.0--4.1.sql \
+  repmgr--4.1.sql \
+  repmgr--4.1--4.2.sql \
+  repmgr--4.2.sql
 
 REGRESS = repmgr_extension
 
@@ -26,19 +30,24 @@ all: \
 PG_CPPFLAGS = -std=gnu89 -I$(includedir_internal) -I$(libpq_srcdir) -Wall -Wmissing-prototypes -Wmissing-declarations $(EXTRA_CFLAGS)
 SHLIB_LINK = $(libpq)
 
-HEADERS = $(wildcard *.h)
+
 
 OBJS = \
 	repmgr.o
 
 include Makefile.global
 
+ifeq ($(vpath_build),yes)
+	HEADERS = $(wildcard *.h)
+else
+	HEADERS_built = $(wildcard *.h)
+endif
 
 $(info Building against PostgreSQL $(MAJORVERSION))
 
 REPMGR_CLIENT_OBJS = repmgr-client.o \
 	repmgr-action-primary.o repmgr-action-standby.o repmgr-action-witness.o \
-	repmgr-action-bdr.o repmgr-action-cluster.o repmgr-action-node.o \
+	repmgr-action-bdr.o repmgr-action-cluster.o repmgr-action-node.o repmgr-action-daemon.o \
 	configfile.o log.o strutil.o controldata.o dirutil.o compat.o dbutils.o
 REPMGRD_OBJS = repmgrd.o repmgrd-physical.o repmgrd-bdr.o configfile.o log.o dbutils.o strutil.o controldata.o compat.o
 DATE=$(shell date "+%Y-%m-%d")
@@ -82,6 +91,7 @@ additional-clean:
 	rm -f repmgr-action-bdr.o
 	rm -f repmgr-action-node.o
 	rm -f repmgr-action-cluster.o
+	rm -f repmgr-action-daemon.o
 	rm -f repmgrd.o
 	rm -f repmgrd-physical.o
 	rm -f repmgrd-bdr.o

TODO.md

@@ -0,0 +1,20 @@
+TODO
+====
+
+This file contains a list of improvements which are desireable and/or have
+been requested, and which we aim to address/implement when time and resources
+permit.
+
+It is *not* a roadmap and there's no guarantee of any item being implemented
+within any given timeframe.
+
+
+Enable suspension of repmgrd failover
+-------------------------------------
+
+When performing maintenance, e.g. a switchover, it's necessary to stop all
+repmgrd nodes to prevent unintended failover; this is obviously inconvenient.
+We'll need to implement some way of notifying each repmgrd to suspend automatic
+failover until further notice.
+
+Requested in GitHub #410 ( https://github.com/2ndQuadrant/repmgr/issues/410 )

configfile.c

@@ -28,10 +28,8 @@ char		config_file_path[MAXPGPATH] = "";
 static bool config_file_provided = false;
 bool		config_file_found = false;
 
+static void parse_config(t_configuration_options *options, bool terse);
 static void _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *warning_list);
-static bool parse_bool(const char *s,
-		   const char *config_item,
-		   ItemList *error_list);
 
 static void _parse_line(char *buf, char *name, char *value);
 static void parse_event_notifications_list(t_configuration_options *options, const char *arg);
@@ -90,8 +88,7 @@ load_config(const char *config_file, bool verbose, bool terse, t_configuration_o
 
 			if (pwd != NULL)
 			{
-				appendPQExpBuffer(&fullpath,
-								  "%s", pwd);
+				appendPQExpBufferStr(&fullpath, pwd);
 			}
 			else
 			{
@@ -107,9 +104,7 @@ load_config(const char *config_file, bool verbose, bool terse, t_configuration_o
 					exit(ERR_BAD_CONFIG);
 				}
 
-				appendPQExpBuffer(&fullpath,
-								  "%s",
-								  cwd);
+				appendPQExpBufferStr(&fullpath, cwd);
 			}
 
 			appendPQExpBuffer(&fullpath,
@@ -241,7 +236,7 @@ end_search:
 }
 
 
-void
+static void
 parse_config(t_configuration_options *options, bool terse)
 {
 	/* Collate configuration file errors here for friendlier reporting */
@@ -288,7 +283,9 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 	memset(options->node_name, 0, sizeof(options->node_name));
 	memset(options->conninfo, 0, sizeof(options->conninfo));
 	memset(options->data_directory, 0, sizeof(options->data_directory));
+	memset(options->config_directory, 0, sizeof(options->data_directory));
 	memset(options->pg_bindir, 0, sizeof(options->pg_bindir));
+	memset(options->repmgr_bindir, 0, sizeof(options->repmgr_bindir));
 	options->replication_type = REPLICATION_TYPE_PHYSICAL;
 
 	/*-------------
@@ -314,16 +311,31 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 	options->tablespace_mapping.tail = NULL;
 	memset(options->recovery_min_apply_delay, 0, sizeof(options->recovery_min_apply_delay));
 	options->recovery_min_apply_delay_provided = false;
+	memset(options->archive_cleanup_command, 0, sizeof(options->archive_cleanup_command));
 	options->use_primary_conninfo_password = false;
 	memset(options->passfile, 0, sizeof(options->passfile));
 
-	/*-----------------------
+	/*-------------------------
 	 * standby promote settings
-	 *------------------------
+	 *-------------------------
 	 */
 	options->promote_check_timeout = DEFAULT_PROMOTE_CHECK_TIMEOUT;
 	options->promote_check_interval = DEFAULT_PROMOTE_CHECK_INTERVAL;
 
+	/*------------------------
+	 * standby follow settings
+	 *------------------------
+	 */
+	options->primary_follow_timeout = DEFAULT_PRIMARY_FOLLOW_TIMEOUT;
+	options->standby_follow_timeout = DEFAULT_STANDBY_FOLLOW_TIMEOUT;
+
+	/*------------------------
+	 * standby switchover settings
+	 *------------------------
+	 */
+	options->shutdown_check_timeout = DEFAULT_SHUTDOWN_CHECK_TIMEOUT;
+	options->standby_reconnect_timeout = DEFAULT_STANDBY_RECONNECT_TIMEOUT;
+
 	/*-----------------
 	 * repmgrd settings
 	 *-----------------
@@ -343,8 +355,8 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 	options->degraded_monitoring_timeout = -1;
 	options->async_query_timeout = DEFAULT_ASYNC_QUERY_TIMEOUT;
 	options->primary_notification_timeout = DEFAULT_PRIMARY_NOTIFICATION_TIMEOUT;
-	options->primary_follow_timeout = DEFAULT_PRIMARY_FOLLOW_TIMEOUT;
-	options->standby_reconnect_timeout = DEFAULT_STANDBY_RECONNECT_TIMEOUT;
+	options->repmgrd_standby_startup_timeout = -1; /* defaults to "standby_reconnect_timeout" if not set */
+	memset(options->repmgrd_pid_file, 0, sizeof(options->repmgrd_pid_file));
 
 	/*-------------
 	 * witness settings
@@ -463,6 +475,9 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 			strncpy(options->conninfo, value, MAXLEN);
 		else if (strcmp(name, "data_directory") == 0)
 			strncpy(options->data_directory, value, MAXPGPATH);
+		else if (strcmp(name, "config_directory") == 0)
+			strncpy(options->config_directory, value, MAXPGPATH);
+
 		else if (strcmp(name, "replication_user") == 0)
 		{
 			if (strlen(value) < NAMEDATALEN)
@@ -473,6 +488,8 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 		}
 		else if (strcmp(name, "pg_bindir") == 0)
 			strncpy(options->pg_bindir, value, MAXPGPATH);
+		else if (strcmp(name, "repmgr_bindir") == 0)
+			strncpy(options->repmgr_bindir, value, MAXPGPATH);
 
 		else if (strcmp(name, "replication_type") == 0)
 		{
@@ -508,6 +525,8 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 			parse_time_unit_parameter(name, value, options->recovery_min_apply_delay, error_list);
 			options->recovery_min_apply_delay_provided = true;
 		}
+		else if (strcmp(name, "archive_cleanup_command") == 0)
+			strncpy(options->archive_cleanup_command, value, MAXLEN);
 		else if (strcmp(name, "use_primary_conninfo_password") == 0)
 			options->use_primary_conninfo_password = parse_bool(value, name, error_list);
 		else if (strcmp(name, "passfile") == 0)
@@ -520,10 +539,26 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 		else if (strcmp(name, "promote_check_interval") == 0)
 			options->promote_check_interval = repmgr_atoi(value, name, error_list, 1);
 
+		/* standby follow settings */
+		else if (strcmp(name, "primary_follow_timeout") == 0)
+			options->primary_follow_timeout = repmgr_atoi(value, name, error_list, 0);
+		else if (strcmp(name, "standby_follow_timeout") == 0)
+			options->standby_follow_timeout = repmgr_atoi(value, name, error_list, 0);
+
+		/* standby switchover settings */
+		else if (strcmp(name, "shutdown_check_timeout") == 0)
+			options->shutdown_check_timeout = repmgr_atoi(value, name, error_list, 0);
+		else if (strcmp(name, "standby_reconnect_timeout") == 0)
+			options->standby_reconnect_timeout = repmgr_atoi(value, name, error_list, 0);
+
+		/* node rejoin settings */
+		else if (strcmp(name, "node_rejoin_timeout") == 0)
+			options->node_rejoin_timeout = repmgr_atoi(value, name, error_list, 0);
+
 		/* node check settings */
 		else if (strcmp(name, "archive_ready_warning") == 0)
 			options->archive_ready_warning = repmgr_atoi(value, name, error_list, 1);
-		else if (strcmp(name, "archive_ready_critcial") == 0)
+		else if (strcmp(name, "archive_ready_critical") == 0)
 			options->archive_ready_critical = repmgr_atoi(value, name, error_list, 1);
 		else if (strcmp(name, "replication_lag_warning") == 0)
 			options->replication_lag_warning = repmgr_atoi(value, name, error_list, 1);
@@ -564,15 +599,15 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 		else if (strcmp(name, "monitoring_history") == 0)
 			options->monitoring_history = parse_bool(value, name, error_list);
 		else if (strcmp(name, "degraded_monitoring_timeout") == 0)
-			options->degraded_monitoring_timeout = repmgr_atoi(value, name, error_list, 1);
+			options->degraded_monitoring_timeout = repmgr_atoi(value, name, error_list, -1);
 		else if (strcmp(name, "async_query_timeout") == 0)
 			options->async_query_timeout = repmgr_atoi(value, name, error_list, 0);
 		else if (strcmp(name, "primary_notification_timeout") == 0)
 			options->primary_notification_timeout = repmgr_atoi(value, name, error_list, 0);
-		else if (strcmp(name, "primary_follow_timeout") == 0)
-			options->primary_follow_timeout = repmgr_atoi(value, name, error_list, 0);
-		else if (strcmp(name, "standby_reconnect_timeout") == 0)
-			options->standby_reconnect_timeout = repmgr_atoi(value, name, error_list, 0);
+		else if (strcmp(name, "repmgrd_standby_startup_timeout") == 0)
+			options->repmgrd_standby_startup_timeout = repmgr_atoi(value, name, error_list, 0);
+		else if (strcmp(name, "repmgrd_pid_file") == 0)
+			strncpy(options->repmgrd_pid_file, value, MAXPGPATH);
 
 		/* witness settings */
 		else if (strcmp(name, "witness_sync_interval") == 0)
@@ -754,6 +789,17 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 		PQconninfoFree(conninfo_options);
 	}
 
+	/* set values for parameters which default to other parameters */
+
+	/*
+	 * From 4.1, "repmgrd_standby_startup_timeout" replaces "standby_reconnect_timeout"
+	 * in repmgrd; fall back to "standby_reconnect_timeout" if no value explicitly provided
+	 */
+	if (options->repmgrd_standby_startup_timeout == -1)
+	{
+		options->repmgrd_standby_startup_timeout = options->standby_reconnect_timeout;
+	}
+
 	/* add warning about changed "barman_" parameter meanings */
 	if ((options->barman_host[0] == '\0' && options->barman_server[0] != '\0') ||
 		(options->barman_host[0] != '\0' && options->barman_server[0] == '\0'))
@@ -778,6 +824,12 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
 		item_list_append(error_list,
 						 _("\replication_lag_critical\" must be greater than  \"replication_lag_warning\""));
 	}
+
+	if (options->standby_reconnect_timeout < options->node_rejoin_timeout)
+	{
+		item_list_append(error_list,
+						 _("\"standby_reconnect_timeout\" must be equal to or greater than \"node_rejoin_timeout\""));
+	}
 }
 
 
@@ -942,12 +994,11 @@ parse_time_unit_parameter(const char *name, const char *value, char *dest, ItemL
 	char	   *ptr = NULL;
 	int			targ = strtol(value, &ptr, 10);
 
-	if (targ < 1)
+	if (targ < 0)
 	{
 		if (errors != NULL)
 		{
-			item_list_append_format(
-									errors,
+			item_list_append_format(errors,
 									_("invalid value provided for \"%s\""),
 									name);
 		}
@@ -1001,13 +1052,16 @@ parse_time_unit_parameter(const char *name, const char *value, char *dest, ItemL
  * - promote_delay
  * - reconnect_attempts
  * - reconnect_interval
+ * - repmgrd_standby_startup_timeout
  * - retry_promote_interval_secs
  *
- * non-changeable options
+ * non-changeable options (repmgrd references these from the "repmgr.nodes"
+ * table, not the configuration file)
  *
  * - node_id
  * - node_name
  * - data_directory
+ * - location
  * - priority
  * - replication_type
  *
@@ -1016,7 +1070,7 @@ parse_time_unit_parameter(const char *name, const char *value, char *dest, ItemL
 
  */
 bool
-reload_config(t_configuration_options *orig_options)
+reload_config(t_configuration_options *orig_options, t_server_type server_type)
 {
 	PGconn	   *conn;
 	t_configuration_options new_options = T_CONFIGURATION_OPTIONS_INITIALIZER;
@@ -1026,17 +1080,50 @@ reload_config(t_configuration_options *orig_options)
 	static ItemList config_errors = {NULL, NULL};
 	static ItemList config_warnings = {NULL, NULL};
 
+	PQExpBufferData errors;
+
 	log_info(_("reloading configuration file"));
 
 	_parse_config(&new_options, &config_errors, &config_warnings);
 
+
+	if (server_type == PRIMARY || server_type == STANDBY)
+	{
+		if (new_options.promote_command[0] == '\0')
+		{
+			item_list_append(&config_errors, _("\"promote_command\": required parameter was not found"));
+		}
+
+		if (new_options.follow_command[0] == '\0')
+		{
+			item_list_append(&config_errors, _("\"follow_command\": required parameter was not found"));
+		}
+	}
+
 	if (config_errors.head != NULL)
 	{
-		/* XXX dump errors to log */
+		ItemListCell *cell = NULL;
+
 		log_warning(_("unable to parse new configuration, retaining current configuration"));
+
+		initPQExpBuffer(&errors);
+
+		appendPQExpBufferStr(&errors,
+							 "following errors were detected:\n");
+
+		for (cell = config_errors.head; cell; cell = cell->next)
+		{
+			appendPQExpBuffer(&errors,
+							  "  %s\n", cell->string);
+		}
+
+		log_detail("%s", errors.data);
+		termPQExpBuffer(&errors);
 		return false;
 	}
 
+
+
 	/* The following options cannot be changed */
 
 	if (new_options.node_id != orig_options->node_id)
@@ -1190,7 +1277,7 @@ reload_config(t_configuration_options *orig_options)
 		config_changed = true;
 	}
 
-	/* promote_delay */
+	/* promote_delay (for testing use only; not documented */
 	if (orig_options->promote_delay != new_options.promote_delay)
 	{
 		orig_options->promote_delay = new_options.promote_delay;
@@ -1217,6 +1304,15 @@ reload_config(t_configuration_options *orig_options)
 		config_changed = true;
 	}
 
+	/* repmgrd_standby_startup_timeout */
+	if (orig_options->repmgrd_standby_startup_timeout != new_options.repmgrd_standby_startup_timeout)
+	{
+		orig_options->repmgrd_standby_startup_timeout = new_options.repmgrd_standby_startup_timeout;
+		log_info(_("\"repmgrd_standby_startup_timeout\" is now \"%i\""), new_options.repmgrd_standby_startup_timeout);
+
+		config_changed = true;
+	}
+
 	/*
 	 * Handle changes to logging configuration
 	 */
@@ -1309,13 +1405,23 @@ exit_with_config_file_errors(ItemList *config_errors, ItemList *config_warnings,
 
 
 void
-exit_with_cli_errors(ItemList *error_list)
+exit_with_cli_errors(ItemList *error_list, const char *repmgr_command)
 {
 	fprintf(stderr, _("The following command line errors were encountered:\n"));
 
 	print_item_list(error_list);
 
-	fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname());
+	if (repmgr_command != NULL)
+	{
+		fprintf(stderr, _("Try \"%s --help\" or \"%s %s --help\" for more information.\n"),
+				progname(),
+				progname(),
+				repmgr_command);
+	}
+	else
+	{
+		fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname());
+	}
 
 	exit(ERR_BAD_CONFIG);
 }
@@ -1420,11 +1526,14 @@ repmgr_atoi(const char *value, const char *config_item, ItemList *error_list, in
  *
  *   https://www.postgresql.org/docs/current/static/config-setting.html
  */
-static bool
+bool
 parse_bool(const char *s, const char *config_item, ItemList *error_list)
 {
 	PQExpBufferData errors;
 
+	if (s == NULL)
+		return true;
+
 	if (strcasecmp(s, "0") == 0)
 		return false;
 
@@ -1706,6 +1815,9 @@ free_parsed_argv(char ***argv_array)
 }
 
 
+
+
+
 bool
 parse_pg_basebackup_options(const char *pg_basebackup_options, t_basebackup_options *backup_options, int server_version_num, ItemList *error_list)
 {

configfile.h

@@ -73,7 +73,9 @@ typedef struct
 	char		conninfo[MAXLEN];
 	char		replication_user[NAMEDATALEN];
 	char		data_directory[MAXPGPATH];
+	char		config_directory[MAXPGPATH];
 	char		pg_bindir[MAXPGPATH];
+	char		repmgr_bindir[MAXPGPATH];
 	int			replication_type;
 
 	/* log settings */
@@ -89,6 +91,7 @@ typedef struct
 	TablespaceList tablespace_mapping;
 	char		recovery_min_apply_delay[MAXLEN];
 	bool		recovery_min_apply_delay_provided;
+	char		archive_cleanup_command[MAXLEN];
 	bool		use_primary_conninfo_password;
 	char		passfile[MAXPGPATH];
 
@@ -96,6 +99,17 @@ typedef struct
 	int			promote_check_timeout;
 	int			promote_check_interval;
 
+	/* standby follow settings */
+	int			primary_follow_timeout;
+	int			standby_follow_timeout;
+
+	/* standby switchover settings */
+	int			shutdown_check_timeout;
+	int			standby_reconnect_timeout;
+
+	/* node rejoin settings */
+	int			node_rejoin_timeout;
+
 	/* node check settings */
 	int			archive_ready_warning;
 	int			archive_ready_critical;
@@ -118,8 +132,8 @@ typedef struct
 	int			degraded_monitoring_timeout;
 	int			async_query_timeout;
 	int			primary_notification_timeout;
-	int			primary_follow_timeout;
-	int			standby_reconnect_timeout;
+	int			repmgrd_standby_startup_timeout;
+	char		repmgrd_pid_file[MAXPGPATH];
 
 	/* BDR settings */
 	bool		bdr_local_monitoring_only;
@@ -158,13 +172,21 @@ typedef struct
 
 #define T_CONFIGURATION_OPTIONS_INITIALIZER { \
 		/* node information */ \
-		UNKNOWN_NODE_ID, "", "", "", "", "", REPLICATION_TYPE_PHYSICAL,	\
+		UNKNOWN_NODE_ID, "", "", "", "", "", "", "", REPLICATION_TYPE_PHYSICAL,	\
 		/* log settings */ \
 		"", "", "", DEFAULT_LOG_STATUS_INTERVAL,	\
-		/* standby action settings */ \
-		false, "", "", { NULL, NULL }, "", false, false, "",	\
+		/* standby clone settings */ \
+		false, "", "", { NULL, NULL }, "", false, "", false, "", \
 		/* standby promote settings */ \
 		DEFAULT_PROMOTE_CHECK_TIMEOUT, DEFAULT_PROMOTE_CHECK_INTERVAL, \
+		/* standby follow settings */ \
+		DEFAULT_PRIMARY_FOLLOW_TIMEOUT,	\
+		DEFAULT_STANDBY_FOLLOW_TIMEOUT,	\
+		/* standby switchover settings */ \
+		DEFAULT_SHUTDOWN_CHECK_TIMEOUT, \
+		DEFAULT_STANDBY_RECONNECT_TIMEOUT, \
+		/* node rejoin settings */ \
+		DEFAULT_NODE_REJOIN_TIMEOUT, \
 		/* node check settings */ \
 		DEFAULT_ARCHIVE_READY_WARNING, DEFAULT_ARCHIVE_READY_CRITICAL, \
 		DEFAULT_REPLICATION_LAG_WARNING, DEFAULT_REPLICATION_LAG_CRITICAL, \
@@ -178,8 +200,7 @@ typedef struct
         false, -1, \
 		DEFAULT_ASYNC_QUERY_TIMEOUT, \
 		DEFAULT_PRIMARY_NOTIFICATION_TIMEOUT,	\
-		DEFAULT_PRIMARY_FOLLOW_TIMEOUT,	\
-		DEFAULT_STANDBY_RECONNECT_TIMEOUT,	\
+		-1, "", \
 		/* BDR settings */ \
 		false, DEFAULT_BDR_RECOVERY_TIMEOUT, \
 		/* service settings */ \
@@ -255,16 +276,20 @@ typedef struct
 	"", "", "", "" \
 }
 
+#include "dbutils.h"
 
 void		set_progname(const char *argv0);
 const char *progname(void);
 
 void		load_config(const char *config_file, bool verbose, bool terse, t_configuration_options *options, char *argv0);
-void		parse_config(t_configuration_options *options, bool terse);
-bool		reload_config(t_configuration_options *orig_options);
+bool		reload_config(t_configuration_options *orig_options, t_server_type server_type);
 
 bool		parse_recovery_conf(const char *data_dir, t_recovery_conf *conf);
 
+bool		parse_bool(const char *s,
+					   const char *config_item,
+					   ItemList *error_list);
+
 int repmgr_atoi(const char *s,
 			const char *config_item,
 			ItemList *error_list,
@@ -280,7 +305,7 @@ void free_parsed_argv(char ***argv_array);
 
 
 /* called by repmgr-client and repmgrd */
-void		exit_with_cli_errors(ItemList *error_list);
+void		exit_with_cli_errors(ItemList *error_list, const char *repmgr_command);
 void		print_item_list(ItemList *item_list);
 
 #endif							/* _REPMGR_CONFIGFILE_H_ */

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for repmgr 4.0.4.
+# Generated by GNU Autoconf 2.69 for repmgr 4.2.
 #
 # Report bugs to <pgsql-bugs@postgresql.org>.
 #
@@ -582,8 +582,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='repmgr'
 PACKAGE_TARNAME='repmgr'
-PACKAGE_VERSION='4.0.4'
-PACKAGE_STRING='repmgr 4.0.4'
+PACKAGE_VERSION='4.2'
+PACKAGE_STRING='repmgr 4.2'
 PACKAGE_BUGREPORT='pgsql-bugs@postgresql.org'
 PACKAGE_URL='https://2ndquadrant.com/en/resources/repmgr/'
 
@@ -1178,7 +1178,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures repmgr 4.0.4 to adapt to many kinds of systems.
+\`configure' configures repmgr 4.2 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1239,7 +1239,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of repmgr 4.0.4:";;
+     short | recursive ) echo "Configuration of repmgr 4.2:";;
    esac
   cat <<\_ACEOF
 
@@ -1313,7 +1313,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-repmgr configure 4.0.4
+repmgr configure 4.2
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1332,7 +1332,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by repmgr $as_me 4.0.4, which was
+It was created by repmgr $as_me 4.2, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -2359,7 +2359,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by repmgr $as_me 4.0.4, which was
+This file was extended by repmgr $as_me 4.2, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -2422,7 +2422,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-repmgr config.status 4.0.4
+repmgr config.status 4.2
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 

configure.in

@@ -1,4 +1,4 @@
-AC_INIT([repmgr], [4.0.4], [pgsql-bugs@postgresql.org], [repmgr], [https://2ndquadrant.com/en/resources/repmgr/])
+AC_INIT([repmgr], [4.2], [pgsql-bugs@postgresql.org], [repmgr], [https://2ndquadrant.com/en/resources/repmgr/])
 
 AC_COPYRIGHT([Copyright (c) 2010-2018, 2ndQuadrant Ltd.])
 

controldata.c

@@ -37,13 +37,8 @@ get_system_identifier(const char *data_directory)
 	uint64		system_identifier = UNKNOWN_SYSTEM_IDENTIFIER;
 
 	control_file_info = get_controlfile(data_directory);
+	system_identifier = control_file_info->system_identifier;
 
-	if (control_file_info->control_file_processed == true)
-		system_identifier = control_file_info->control_file->system_identifier;
-	else
-		system_identifier = UNKNOWN_SYSTEM_IDENTIFIER;
-
-	pfree(control_file_info->control_file);
 	pfree(control_file_info);
 
 	return system_identifier;
@@ -57,13 +52,8 @@ get_db_state(const char *data_directory)
 
 	control_file_info = get_controlfile(data_directory);
 
-	if (control_file_info->control_file_processed == true)
-		state = control_file_info->control_file->state;
-	else
-		/* if we were unable to parse the control file, assume DB is shut down */
-		state = DB_SHUTDOWNED;
+	state = control_file_info->state;
 
-	pfree(control_file_info->control_file);
 	pfree(control_file_info);
 
 	return state;
@@ -78,12 +68,8 @@ get_latest_checkpoint_location(const char *data_directory)
 
 	control_file_info = get_controlfile(data_directory);
 
-	if (control_file_info->control_file_processed == false)
-		return InvalidXLogRecPtr;
+	checkPoint = control_file_info->checkPoint;
 
-	checkPoint = control_file_info->control_file->checkPoint;
-
-	pfree(control_file_info->control_file);
 	pfree(control_file_info);
 
 	return checkPoint;
@@ -98,16 +84,8 @@ get_data_checksum_version(const char *data_directory)
 
 	control_file_info = get_controlfile(data_directory);
 
-	if (control_file_info->control_file_processed == false)
-	{
-		data_checksum_version = -1;
-	}
-	else
-	{
-		data_checksum_version = (int) control_file_info->control_file->data_checksum_version;
-	}
+	data_checksum_version = (int) control_file_info->data_checksum_version;
 
-	pfree(control_file_info->control_file);
 	pfree(control_file_info);
 
 	return data_checksum_version;
@@ -139,33 +117,109 @@ describe_db_state(DBState state)
 
 
 /*
- * we maintain our own version of get_controlfile() as we need cross-version
+ * We maintain our own version of get_controlfile() as we need cross-version
  * compatibility, and also don't care if the file isn't readable.
  */
 static ControlFileInfo *
 get_controlfile(const char *DataDir)
 {
 	ControlFileInfo *control_file_info;
-	int			fd;
+	FILE	   *fp = NULL;
+	int			fd, ret, version_num;
+	char		PgVersionPath[MAXPGPATH] = "";
 	char		ControlFilePath[MAXPGPATH] = "";
+	char		file_version_string[64] = "";
+	long		file_major, file_minor;
+	char	   *endptr = NULL;
+	void	   *ControlFileDataPtr = NULL;
+	int			expected_size = 0;
 
 	control_file_info = palloc0(sizeof(ControlFileInfo));
+
+	/* set default values */
 	control_file_info->control_file_processed = false;
-	control_file_info->control_file = palloc0(sizeof(ControlFileData));
+	control_file_info->system_identifier = UNKNOWN_SYSTEM_IDENTIFIER;
+	control_file_info->state = DB_SHUTDOWNED;
+	control_file_info->checkPoint = InvalidXLogRecPtr;
+	control_file_info->data_checksum_version = -1;
+
+	/*
+	 * Read PG_VERSION, as we'll need to determine which struct to read
+	 * the control file contents into
+	 */
+	snprintf(PgVersionPath, MAXPGPATH, "%s/PG_VERSION", DataDir);
+
+	fp = fopen(PgVersionPath, "r");
+
+	if (fp == NULL)
+	{
+		log_warning(_("could not open file \"%s\" for reading"),
+					PgVersionPath);
+		log_detail("%s", strerror(errno));
+		return control_file_info;
+	}
+
+	file_version_string[0] = '\0';
+
+	ret = fscanf(fp, "%63s", file_version_string);
+	fclose(fp);
+
+	if (ret != 1 || endptr == file_version_string)
+	{
+		log_warning(_("unable to determine major version number from PG_VERSION"));
+
+		return control_file_info;
+	}
+
+	file_major = strtol(file_version_string, &endptr, 10);
+	file_minor = 0;
+
+	if (*endptr == '.')
+		file_minor = strtol(endptr + 1, NULL, 10);
+
+	version_num = ((int) file_major * 10000) + ((int) file_minor * 100);
+
+	if (version_num < 90300)
+	{
+		log_warning(_("Data directory appears to be initialised for %s"), file_version_string);
+		return control_file_info;
+	}
+
 
 	snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
 
 	if ((fd = open(ControlFilePath, O_RDONLY | PG_BINARY, 0)) == -1)
 	{
-		log_debug("could not open file \"%s\" for reading: %s",
-				  ControlFilePath, strerror(errno));
+		log_warning(_("could not open file \"%s\" for reading"),
+					ControlFilePath);
+		log_detail("%s", strerror(errno));
 		return control_file_info;
 	}
 
-	if (read(fd, control_file_info->control_file, sizeof(ControlFileData)) != sizeof(ControlFileData))
+
+	if (version_num >= 90500)
 	{
-		log_debug("could not read file \"%s\": %s",
-				  ControlFilePath, strerror(errno));
+		expected_size = sizeof(ControlFileData95);
+		ControlFileDataPtr = palloc0(expected_size);
+	}
+	else if (version_num >= 90400)
+	{
+		expected_size = sizeof(ControlFileData94);
+		ControlFileDataPtr = palloc0(expected_size);
+	}
+	else if (version_num >= 90300)
+	{
+		expected_size = sizeof(ControlFileData93);
+		ControlFileDataPtr = palloc0(expected_size);
+	}
+
+
+	if (read(fd, ControlFileDataPtr, expected_size) != expected_size)
+	{
+		log_warning(_("could not read file \"%s\""),
+					ControlFilePath);
+		log_detail("%s", strerror(errno));
+
 		return control_file_info;
 	}
 
@@ -173,6 +227,41 @@ get_controlfile(const char *DataDir)
 
 	control_file_info->control_file_processed = true;
 
+	if (version_num >= 110000)
+	{
+		ControlFileData11 *ptr = (struct ControlFileData11 *)ControlFileDataPtr;
+		control_file_info->system_identifier = ptr->system_identifier;
+		control_file_info->state = ptr->state;
+		control_file_info->checkPoint = ptr->checkPoint;
+		control_file_info->data_checksum_version = ptr->data_checksum_version;
+	}
+	else if (version_num >= 90500)
+	{
+		ControlFileData95 *ptr = (struct ControlFileData95 *)ControlFileDataPtr;
+		control_file_info->system_identifier = ptr->system_identifier;
+		control_file_info->state = ptr->state;
+		control_file_info->checkPoint = ptr->checkPoint;
+		control_file_info->data_checksum_version = ptr->data_checksum_version;
+	}
+	else if (version_num >= 90400)
+	{
+		ControlFileData94 *ptr = (struct ControlFileData94 *)ControlFileDataPtr;
+		control_file_info->system_identifier = ptr->system_identifier;
+		control_file_info->state = ptr->state;
+		control_file_info->checkPoint = ptr->checkPoint;
+		control_file_info->data_checksum_version = ptr->data_checksum_version;
+	}
+	else if (version_num >= 90300)
+	{
+		ControlFileData93 *ptr = (struct ControlFileData93 *)ControlFileDataPtr;
+		control_file_info->system_identifier = ptr->system_identifier;
+		control_file_info->state = ptr->state;
+		control_file_info->checkPoint = ptr->checkPoint;
+		control_file_info->data_checksum_version = ptr->data_checksum_version;
+	}
+
+	pfree(ControlFileDataPtr);
+
 	/*
 	 * We don't check the CRC here as we're potentially checking a pg_control
 	 * file from a different PostgreSQL version to the one repmgr was compiled

controldata.h

@@ -12,12 +12,326 @@
 #include "postgres_fe.h"
 #include "catalog/pg_control.h"
 
+/*
+ * A simplified representation of pg_control containing only those fields
+ * required by repmgr.
+ */
 typedef struct
 {
 	bool		control_file_processed;
-	ControlFileData *control_file;
+	uint64		system_identifier;
+	DBState		state;
+	XLogRecPtr	checkPoint;
+	uint32		data_checksum_version;
 } ControlFileInfo;
 
+
+
+/* Same for 9.3, 9.4 */
+typedef struct CheckPoint93
+{
+	XLogRecPtr	redo;			/* next RecPtr available when we began to
+								 * create CheckPoint (i.e. REDO start point) */
+	TimeLineID	ThisTimeLineID; /* current TLI */
+	TimeLineID	PrevTimeLineID; /* previous TLI, if this record begins a new
+								 * timeline (equals ThisTimeLineID otherwise) */
+	bool		fullPageWrites; /* current full_page_writes */
+	uint32		nextXidEpoch;	/* higher-order bits of nextXid */
+	TransactionId nextXid;		/* next free XID */
+	Oid			nextOid;		/* next free OID */
+	MultiXactId nextMulti;		/* next free MultiXactId */
+	MultiXactOffset nextMultiOffset;	/* next free MultiXact offset */
+	TransactionId oldestXid;	/* cluster-wide minimum datfrozenxid */
+	Oid			oldestXidDB;	/* database with minimum datfrozenxid */
+	MultiXactId oldestMulti;	/* cluster-wide minimum datminmxid */
+	Oid			oldestMultiDB;	/* database with minimum datminmxid */
+	pg_time_t	time;			/* time stamp of checkpoint */
+
+	TransactionId oldestActiveXid;
+} CheckPoint93;
+
+
+/* Same for 9.5, 9.6, 10, HEAD */
+typedef struct CheckPoint95
+{
+	XLogRecPtr	redo;			/* next RecPtr available when we began to
+								 * create CheckPoint (i.e. REDO start point) */
+	TimeLineID	ThisTimeLineID; /* current TLI */
+	TimeLineID	PrevTimeLineID; /* previous TLI, if this record begins a new
+								 * timeline (equals ThisTimeLineID otherwise) */
+	bool		fullPageWrites; /* current full_page_writes */
+	uint32		nextXidEpoch;	/* higher-order bits of nextXid */
+	TransactionId nextXid;		/* next free XID */
+	Oid			nextOid;		/* next free OID */
+	MultiXactId nextMulti;		/* next free MultiXactId */
+	MultiXactOffset nextMultiOffset;	/* next free MultiXact offset */
+	TransactionId oldestXid;	/* cluster-wide minimum datfrozenxid */
+	Oid			oldestXidDB;	/* database with minimum datfrozenxid */
+	MultiXactId oldestMulti;	/* cluster-wide minimum datminmxid */
+	Oid			oldestMultiDB;	/* database with minimum datminmxid */
+	pg_time_t	time;			/* time stamp of checkpoint */
+	TransactionId oldestCommitTsXid;	/* oldest Xid with valid commit
+										 * timestamp */
+	TransactionId newestCommitTsXid;	/* newest Xid with valid commit
+										 * timestamp */
+
+	TransactionId oldestActiveXid;
+} CheckPoint95;
+
+
+typedef struct ControlFileData93
+{
+	uint64		system_identifier;
+
+	uint32		pg_control_version;		/* PG_CONTROL_VERSION */
+	uint32		catalog_version_no;		/* see catversion.h */
+
+	DBState		state;			/* see enum above */
+	pg_time_t	time;			/* time stamp of last pg_control update */
+	XLogRecPtr	checkPoint;		/* last check point record ptr */
+	XLogRecPtr	prevCheckPoint; /* previous check point record ptr */
+
+	CheckPoint93	checkPointCopy; /* copy of last check point record */
+
+	XLogRecPtr	unloggedLSN;	/* current fake LSN value, for unlogged rels */
+
+	XLogRecPtr	minRecoveryPoint;
+	TimeLineID	minRecoveryPointTLI;
+	XLogRecPtr	backupStartPoint;
+	XLogRecPtr	backupEndPoint;
+	bool		backupEndRequired;
+
+	int			wal_level;
+	int			MaxConnections;
+	int			max_prepared_xacts;
+	int			max_locks_per_xact;
+
+	uint32		maxAlign;		/* alignment requirement for tuples */
+	double		floatFormat;	/* constant 1234567.0 */
+
+	uint32		blcksz;			/* data block size for this DB */
+	uint32		relseg_size;	/* blocks per segment of large relation */
+
+	uint32		xlog_blcksz;	/* block size within WAL files */
+	uint32		xlog_seg_size;	/* size of each WAL segment */
+
+	uint32		nameDataLen;	/* catalog name field width */
+	uint32		indexMaxKeys;	/* max number of columns in an index */
+
+	uint32		toast_max_chunk_size;	/* chunk size in TOAST tables */
+
+	/* flag indicating internal format of timestamp, interval, time */
+	bool		enableIntTimes; /* int64 storage enabled? */
+
+	/* flags indicating pass-by-value status of various types */
+	bool		float4ByVal;	/* float4 pass-by-value? */
+	bool		float8ByVal;	/* float8, int8, etc pass-by-value? */
+
+	/* Are data pages protected by checksums? Zero if no checksum version */
+	uint32		data_checksum_version;
+
+} ControlFileData93;
+
+
+/*
+ * Following fields added since 9.3:
+ *
+ * 	int			max_worker_processes;
+ *  int			max_prepared_xacts;
+ *  int			max_locks_per_xact;
+ *
+ */
+typedef struct ControlFileData94
+{
+	uint64		system_identifier;
+
+	uint32		pg_control_version;		/* PG_CONTROL_VERSION */
+	uint32		catalog_version_no;		/* see catversion.h */
+
+	DBState		state;			/* see enum above */
+	pg_time_t	time;			/* time stamp of last pg_control update */
+	XLogRecPtr	checkPoint;		/* last check point record ptr */
+	XLogRecPtr	prevCheckPoint; /* previous check point record ptr */
+
+	CheckPoint93	checkPointCopy; /* copy of last check point record */
+
+	XLogRecPtr	unloggedLSN;	/* current fake LSN value, for unlogged rels */
+
+	XLogRecPtr	minRecoveryPoint;
+	TimeLineID	minRecoveryPointTLI;
+	XLogRecPtr	backupStartPoint;
+	XLogRecPtr	backupEndPoint;
+	bool		backupEndRequired;
+
+	int			wal_level;
+	bool		wal_log_hints;
+	int			MaxConnections;
+	int			max_worker_processes;
+	int			max_prepared_xacts;
+	int			max_locks_per_xact;
+
+	uint32		maxAlign;		/* alignment requirement for tuples */
+	double		floatFormat;	/* constant 1234567.0 */
+
+	uint32		blcksz;			/* data block size for this DB */
+	uint32		relseg_size;	/* blocks per segment of large relation */
+
+	uint32		xlog_blcksz;	/* block size within WAL files */
+	uint32		xlog_seg_size;	/* size of each WAL segment */
+
+	uint32		nameDataLen;	/* catalog name field width */
+	uint32		indexMaxKeys;	/* max number of columns in an index */
+
+	uint32		toast_max_chunk_size;	/* chunk size in TOAST tables */
+	uint32		loblksize;		/* chunk size in pg_largeobject */
+
+	bool		enableIntTimes; /* int64 storage enabled? */
+
+	bool		float4ByVal;	/* float4 pass-by-value? */
+	bool		float8ByVal;	/* float8, int8, etc pass-by-value? */
+
+	/* Are data pages protected by checksums? Zero if no checksum version */
+	uint32		data_checksum_version;
+
+} ControlFileData94;
+
+
+
+/*
+ * Following field added since 9.4:
+ *
+ *	bool		track_commit_timestamp;
+ *
+ * Unchanged in 9.6
+ *
+ * In 10, following field appended *after* "data_checksum_version":
+ *
+ *	char		mock_authentication_nonce[MOCK_AUTH_NONCE_LEN];
+ *
+ * (but we don't care about that)
+ */
+
+typedef struct ControlFileData95
+{
+	uint64		system_identifier;
+
+	uint32		pg_control_version;		/* PG_CONTROL_VERSION */
+	uint32		catalog_version_no;		/* see catversion.h */
+
+	DBState		state;			/* see enum above */
+	pg_time_t	time;			/* time stamp of last pg_control update */
+	XLogRecPtr	checkPoint;		/* last check point record ptr */
+	XLogRecPtr	prevCheckPoint; /* previous check point record ptr */
+
+	CheckPoint95	checkPointCopy; /* copy of last check point record */
+
+	XLogRecPtr	unloggedLSN;	/* current fake LSN value, for unlogged rels */
+
+	XLogRecPtr	minRecoveryPoint;
+	TimeLineID	minRecoveryPointTLI;
+	XLogRecPtr	backupStartPoint;
+	XLogRecPtr	backupEndPoint;
+	bool		backupEndRequired;
+
+	int			wal_level;
+	bool		wal_log_hints;
+	int			MaxConnections;
+	int			max_worker_processes;
+	int			max_prepared_xacts;
+	int			max_locks_per_xact;
+	bool		track_commit_timestamp;
+
+	uint32		maxAlign;		/* alignment requirement for tuples */
+	double		floatFormat;	/* constant 1234567.0 */
+
+	uint32		blcksz;			/* data block size for this DB */
+	uint32		relseg_size;	/* blocks per segment of large relation */
+
+	uint32		xlog_blcksz;	/* block size within WAL files */
+	uint32		xlog_seg_size;	/* size of each WAL segment */
+
+	uint32		nameDataLen;	/* catalog name field width */
+	uint32		indexMaxKeys;	/* max number of columns in an index */
+
+	uint32		toast_max_chunk_size;	/* chunk size in TOAST tables */
+	uint32		loblksize;		/* chunk size in pg_largeobject */
+
+	bool		enableIntTimes; /* int64 storage enabled? */
+
+	bool		float4ByVal;	/* float4 pass-by-value? */
+	bool		float8ByVal;	/* float8, int8, etc pass-by-value? */
+
+	uint32		data_checksum_version;
+
+} ControlFileData95;
+
+/*
+ * Following field removed in 11:
+ *
+ *  XLogRecPtr	prevCheckPoint;
+ *
+ * In 10, following field appended *after* "data_checksum_version":
+ *
+ * 	char		mock_authentication_nonce[MOCK_AUTH_NONCE_LEN];
+ *
+ * (but we don't care about that)
+ */
+
+typedef struct ControlFileData11
+{
+	uint64		system_identifier;
+
+	uint32		pg_control_version;		/* PG_CONTROL_VERSION */
+	uint32		catalog_version_no;		/* see catversion.h */
+
+	DBState		state;			/* see enum above */
+	pg_time_t	time;			/* time stamp of last pg_control update */
+	XLogRecPtr	checkPoint;		/* last check point record ptr */
+
+	CheckPoint95	checkPointCopy; /* copy of last check point record */
+
+	XLogRecPtr	unloggedLSN;	/* current fake LSN value, for unlogged rels */
+
+	XLogRecPtr	minRecoveryPoint;
+	TimeLineID	minRecoveryPointTLI;
+	XLogRecPtr	backupStartPoint;
+	XLogRecPtr	backupEndPoint;
+	bool		backupEndRequired;
+
+	int			wal_level;
+	bool		wal_log_hints;
+	int			MaxConnections;
+	int			max_worker_processes;
+	int			max_prepared_xacts;
+	int			max_locks_per_xact;
+	bool		track_commit_timestamp;
+
+	uint32		maxAlign;		/* alignment requirement for tuples */
+	double		floatFormat;	/* constant 1234567.0 */
+
+	uint32		blcksz;			/* data block size for this DB */
+	uint32		relseg_size;	/* blocks per segment of large relation */
+
+	uint32		xlog_blcksz;	/* block size within WAL files */
+	uint32		xlog_seg_size;	/* size of each WAL segment */
+
+	uint32		nameDataLen;	/* catalog name field width */
+	uint32		indexMaxKeys;	/* max number of columns in an index */
+
+	uint32		toast_max_chunk_size;	/* chunk size in TOAST tables */
+	uint32		loblksize;		/* chunk size in pg_largeobject */
+
+	bool		enableIntTimes; /* int64 storage enabled? */
+
+	bool		float4ByVal;	/* float4 pass-by-value? */
+	bool		float8ByVal;	/* float8, int8, etc pass-by-value? */
+
+	uint32		data_checksum_version;
+
+} ControlFileData11;
+
+
+
 extern DBState get_db_state(const char *data_directory);
 extern const char *describe_db_state(DBState state);
 extern int	get_data_checksum_version(const char *data_directory);

dbutils.h

@@ -29,7 +29,9 @@
 #include "voting.h"
 
 #define REPMGR_NODES_COLUMNS "n.node_id, n.type, n.upstream_node_id, n.node_name, n.conninfo, n.repluser, n.slot_name, n.location, n.priority, n.active, n.config_file, '' AS upstream_node_name "
-#define BDR_NODES_COLUMNS "node_sysid, node_timeline, node_dboid, node_status, node_name, node_local_dsn, node_init_from_dsn, node_read_only, node_seq_id"
+#define BDR2_NODES_COLUMNS "node_sysid, node_timeline, node_dboid, node_name, node_local_dsn, ''"
+#define BDR3_NODES_COLUMNS "ns.node_id, 0, 0, ns.node_name, ns.interface_connstr, ns.peer_state_name"
+
 
 #define ERRBUFF_SIZE 512
 
@@ -94,6 +96,14 @@ typedef enum
 	SLOT_ACTIVE
 } ReplSlotStatus;
 
+typedef enum
+{
+	BACKUP_STATE_UNKNOWN = -1,
+	BACKUP_STATE_IN_BACKUP,
+	BACKUP_STATE_NO_BACKUP
+} BackupState;
+
+
 /*
  * Struct to store node information
  */
@@ -237,18 +247,14 @@ typedef struct s_bdr_node_info
 	char		node_sysid[MAXLEN];
 	uint32		node_timeline;
 	uint32		node_dboid;
-	char		node_status;
 	char		node_name[MAXLEN];
 	char		node_local_dsn[MAXLEN];
-	char		node_init_from_dsn[MAXLEN];
-	bool		read_only;
-	uint32		node_seq_id;
+	char		peer_state_name[MAXLEN];
 } t_bdr_node_info;
 
 #define T_BDR_NODE_INFO_INITIALIZER { \
 	"", InvalidOid, InvalidOid, \
-	'?', "", "", "", \
-    false, -1 \
+    "", "", "" \
 }
 
 
@@ -321,6 +327,21 @@ typedef struct
     UNKNOWN_TIMELINE_ID, \
 	InvalidXLogRecPtr \
 }
+
+
+typedef struct RepmgrdInfo {
+	int node_id;
+	int pid;
+	char pid_text[MAXLEN];
+	char pid_file[MAXLEN];
+	bool pg_running;
+	char pg_running_text[MAXLEN];
+	bool running;
+	char repmgrd_running[MAXLEN];
+	bool paused;
+} RepmgrdInfo;
+
+
 /* global variables */
 
 extern int	server_version_num;
@@ -353,10 +374,11 @@ PGconn	   *get_primary_connection(PGconn *standby_conn, int *primary_id, char *p
 PGconn	   *get_primary_connection_quiet(PGconn *standby_conn, int *primary_id, char *primary_conninfo_out);
 
 bool		is_superuser_connection(PGconn *conn, t_connection_user *userinfo);
+void		close_connection(PGconn **conn);
 
 /* conninfo manipulation functions */
 bool		get_conninfo_value(const char *conninfo, const char *keyword, char *output);
-
+bool		get_conninfo_default_value(const char *param, char *output, int maxlen);
 void		initialize_conninfo_params(t_conninfo_param_list *param_list, bool set_defaults);
 void		free_conninfo_params(t_conninfo_param_list *param_list);
 void		copy_conninfo_params(t_conninfo_param_list *dest_list, t_conninfo_param_list *source_list);
@@ -364,10 +386,11 @@ void		conn_to_param_list(PGconn *conn, t_conninfo_param_list *param_list);
 void		param_set(t_conninfo_param_list *param_list, const char *param, const char *value);
 void		param_set_ine(t_conninfo_param_list *param_list, const char *param, const char *value);
 char	   *param_get(t_conninfo_param_list *param_list, const char *param);
-bool		parse_conninfo_string(const char *conninfo_str, t_conninfo_param_list *param_list, char *errmsg, bool ignore_local_params);
+bool		parse_conninfo_string(const char *conninfo_str, t_conninfo_param_list *param_list, char **errmsg, bool ignore_local_params);
 char	   *param_list_to_string(t_conninfo_param_list *param_list);
 bool		has_passfile(void);
 
+
 /* transaction functions */
 bool		begin_transaction(PGconn *conn);
 bool		commit_transaction(PGconn *conn);
@@ -386,11 +409,16 @@ bool		get_cluster_size(PGconn *conn, char *size);
 int			get_server_version(PGconn *conn, char *server_version);
 RecoveryType get_recovery_type(PGconn *conn);
 int			get_primary_node_id(PGconn *conn);
-bool		can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *reason);
 int			get_ready_archive_files(PGconn *conn, const char *data_directory);
 bool		identify_system(PGconn *repl_conn, t_system_identification *identification);
 bool		repmgrd_set_local_node_id(PGconn *conn, int local_node_id);
 int			repmgrd_get_local_node_id(PGconn *conn);
+BackupState	server_in_exclusive_backup_mode(PGconn *conn);
+void		repmgrd_set_pid(PGconn *conn, pid_t repmgrd_pid, const char *pidfile);
+pid_t		repmgrd_get_pid(PGconn *conn);
+bool		repmgrd_is_running(PGconn *conn);
+bool		repmgrd_is_paused(PGconn *conn);
+bool		repmgrd_pause(PGconn *conn, bool pause);
 
 /* extension functions */
 ExtensionStatus get_repmgr_extension_status(PGconn *conn);
@@ -413,7 +441,7 @@ t_node_info *get_node_record_pointer(PGconn *conn, int node_id);
 bool		get_local_node_record(PGconn *conn, int node_id, t_node_info *node_info);
 bool		get_primary_node_record(PGconn *conn, t_node_info *node_info);
 
-void		get_all_node_records(PGconn *conn, NodeInfoList *node_list);
+bool		get_all_node_records(PGconn *conn, NodeInfoList *node_list);
 void		get_downstream_node_records(PGconn *conn, int node_id, NodeInfoList *nodes);
 void		get_active_sibling_node_records(PGconn *conn, int node_id, int upstream_node_id, NodeInfoList *node_list);
 void		get_node_records_by_priority(PGconn *conn, NodeInfoList *node_list);
@@ -454,7 +482,8 @@ void		create_slot_name(char *slot_name, int node_id);
 bool		create_replication_slot(PGconn *conn, char *slot_name, int server_version_num, PQExpBufferData *error_msg);
 bool		drop_replication_slot(PGconn *conn, char *slot_name);
 RecordStatus get_slot_record(PGconn *conn, char *slot_name, t_replication_slot *record);
-int			get_free_replication_slots(PGconn *conn);
+int			get_free_replication_slot_count(PGconn *conn);
+int			get_inactive_replication_slots(PGconn *conn, KeyValueList *list);
 
 /* tablespace functions */
 bool		get_tablespace_name_by_location(PGconn *conn, const char *location, char *name);
@@ -465,6 +494,8 @@ int			wait_connection_availability(PGconn *conn, long long timeout);
 
 /* node availability functions */
 bool		is_server_available(const char *conninfo);
+bool		is_server_available_params(t_conninfo_param_list *param_list);
+ExecStatusType	connection_ping(PGconn *conn);
 
 /* monitoring functions  */
 void
@@ -480,8 +511,8 @@ add_monitoring_record(PGconn *primary_conn,
 					  long long unsigned int apply_lag_bytes
 );
 
-int			get_number_of_monitoring_records_to_delete(PGconn *primary_conn, int keep_history);
-bool		delete_monitoring_records(PGconn *primary_conn, int keep_history);
+int			get_number_of_monitoring_records_to_delete(PGconn *primary_conn, int keep_history, int node_id);
+bool		delete_monitoring_records(PGconn *primary_conn, int keep_history, int node_id);
 
 
 
@@ -503,12 +534,14 @@ void		get_node_replication_stats(PGconn *conn, int server_version_num, t_node_in
 bool		is_downstream_node_attached(PGconn *conn, char *node_name);
 
 /* BDR functions */
+int			get_bdr_version_num(void);
 void		get_all_bdr_node_records(PGconn *conn, BdrNodeInfoList *node_list);
 RecordStatus get_bdr_node_record_by_name(PGconn *conn, const char *node_name, t_bdr_node_info *node_info);
 bool		is_bdr_db(PGconn *conn, PQExpBufferData *output);
 bool		is_bdr_db_quiet(PGconn *conn);
 bool		is_active_bdr_node(PGconn *conn, const char *node_name);
 bool		is_bdr_repmgr(PGconn *conn);
+char	   *get_default_bdr_replication_set(PGconn *conn);
 bool		is_table_in_bdr_replication_set(PGconn *conn, const char *tablename, const char *set);
 bool		add_table_to_bdr_replication_set(PGconn *conn, const char *tablename, const char *set);
 void		add_extension_tables_to_bdr_replication_set(PGconn *conn);

doc/appendix-faq.sgml

@@ -24,8 +24,9 @@
       series will no longer be actively maintained.
      </para>
      <para>
-      repmgr 2.x supports PostgreSQL 9.0 ~ 9.3. While it is compatible
-      with PostgreSQL 9.3, we recommend using repmgr 4.x.
+      &repmgr; 2.x supports PostgreSQL 9.0 ~ 9.3. While it is compatible
+      with PostgreSQL 9.3, we recommend using repmgr 4.x. &repmgr; 2.x is
+      no longer maintained.
      </para>
   </sect2>
 
@@ -35,7 +36,7 @@
     Replication slots, introduced in PostgreSQL 9.4, ensure that the
     primary server will retain WAL files until they have been consumed
     by all standby servers. This makes WAL file management much easier,
-    and if used `repmgr` will no longer insist on a fixed minimum number
+    and if used &repmgr; will no longer insist on a fixed minimum number
     (default: 5000) of WAL files being retained.
    </para>
    <para>
@@ -86,12 +87,35 @@
    </para>
    <para>
      To minimize downtime during major upgrades, for more recent PostgreSQL
-     versions <ulink url="https://www.2ndquadrant.com/en/resources/pglogical/">pglogical</ulink>
+     versions (PostgreSQL 9.4 and later),
+     <ulink url="https://www.2ndquadrant.com/en/resources/pglogical/">pglogical</ulink>
      can be used to set up a parallel cluster using the newer PostgreSQL version,
      which can be kept in sync with the existing production cluster until the
      new cluster is ready to be put into production.
    </para>
   </sect2>
+
+  <sect2 id="faq-libdir-repmgr-error">
+   <title>What does this error mean: <literal>ERROR: could not access file "$libdir/repmgr"</literal>?</title>
+   <para>
+     It means the &repmgr; extension code is not installed in the
+     PostgreSQL application directory. This typically happens when using PostgreSQL
+     packages provided by a third-party vendor, which often have different
+     filesystem layouts.
+   </para>
+   <para>
+     Either use PostgreSQL packages provided by the community or 2ndQuadrant; if this
+     is not possible, contact your vendor for assistance.
+   </para>
+  </sect2>
+
+  <sect2 id="faq-old-packages">
+   <title>How can I obtain old versions of &repmgr; packages?</title>
+   <para>
+     See appendix <xref linkend="packages-old-versions"> for details.
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="faq-repmgr" xreflabel="repmgr">
@@ -105,6 +129,7 @@
     standby to have been cloned using &repmgr;.
    </para>
   </sect2>
+
   <sect2 id="faq-repmgr-clone-other-source" >
    <title>Can I use a standby not cloned by &repmgr; as a &repmgr; node?</title>
 
@@ -118,6 +143,13 @@
    </para>
   </sect2>
 
+  <sect2 id="faq-repmgr-recovery-conf" >
+    <title>What does &repmgr; write in <filename>recovery.conf</filename>, and what options can be set there?</title>
+   <para>
+     See section <link linkend="repmgr-standby-clone-recovery-conf">Customising recovery.conf</link>.
+   </para>
+  </sect2>
+
   <sect2 id="faq-repmgr-failed-primary-standby" xreflabel="Reintegrate a failed primary as a standby">
    <title>How can a failed primary be re-added as a standby?</title>
    <para>
@@ -126,19 +158,23 @@
     needs to be re-registered as a standby.
    </para>
    <para>
-    In PostgreSQL 9.5 and later, it's possible to use <command>pg_rewind</command>
-    to re-synchronise the existing data directory, which will usually be much
+    It's possible to use <command>pg_rewind</command> to re-synchronise the existing data
+    directory, which will usually be much
     faster than re-cloning the server. However <command>pg_rewind</command> can only
     be used if PostgreSQL either has <varname>wal_log_hints</varname> enabled, or
     data checksums were enabled when the cluster was initialized.
    </para>
    <para>
-    &repmgr; provides the command <command>repmgr node rejoin</command> which can
-    optionally execute <command>pg_rewind</command>; see the <xref linkend="repmgr-node-rejoin">
-    documentation for details.
+     Note that <command>pg_rewind</command> is available as part of the core PostgreSQL
+     distribution from PostgreSQL 9.5, and as a third-party utility for PostgreSQL 9.3 and 9.4.
    </para>
    <para>
-    If <command>pg_rewind</command> cannot be used, then the data directory will have
+    &repmgr; provides the command <command>repmgr node rejoin</command> which can
+    optionally execute <command>pg_rewind</command>; see the <xref linkend="repmgr-node-rejoin">
+    documentation for details, in particular the section <xref linkend="repmgr-node-rejoin-pg-rewind">.
+   </para>
+   <para>
+    If <command>pg_rewind</command> cannot be used, then the data directory will need
     to be re-cloned from scratch.
    </para>
 
@@ -211,11 +247,22 @@
      Under some circumstances event notifications can be generated for servers
      which have not yet been registered; it's also useful to retain a record
      of events which includes servers removed from the replication cluster
-     which no longer have an entry in the <literal>repmrg.nodes</literal> table.
+     which no longer have an entry in the <literal>repmgr.nodes</literal> table.
    </para>
   </sect2>
 
-
+  <sect2 id="faq-repmgr-recovery-conf-quoted-values" xreflabel="Quoted values in recovery.conf">
+    <title>Why are some values in <filename>recovery.conf</filename> surrounded by pairs of single quotes?</title>
+    <para>
+      This is to ensure that user-supplied values which are written as parameter values in <filename>recovery.conf</filename>
+      are escaped correctly and do not cause errors when <filename>recovery.conf</filename> is parsed.
+    </para>
+    <para>
+      The escaping is performed by an internal PostgreSQL routine, which leaves strings consisting
+      of digits and alphabetical characters only as-is, but wraps everything else in pairs of single quotes,
+      even if the string does not contain any characters which need escaping.
+    </para>
+  </sect2>
 
 
  </sect1>
@@ -227,7 +274,7 @@
   <sect2 id="faq-repmgrd-prevent-promotion" xreflabel="Prevent standby from being promoted to primary">
    <title>How can I prevent a node from ever being promoted to primary?</title>
    <para>
-    In `repmgr.conf`, set its priority to a value of 0 or less; apply the changed setting with
+     In <filename>repmgr.conf</filename>, set its priority to a value of <literal>0</literal>; apply the changed setting with
     <command><link linkend="repmgr-standby-register">repmgr standby register --force</link></command>.
    </para>
    <para>
@@ -275,5 +322,36 @@
    </para>
   </sect2>
 
+  <sect2 id="faq-repmgrd-pg-bindir" xreflabel="repmgrd does not apply pg_bindir to promote_command or follow_command">
+    <title>
+      <application>repmgrd</application> ignores pg_bindir when executing <varname>promote_command</varname> or <varname>follow_command</varname>
+    </title>
+    <para>
+      <varname>promote_command</varname> or <varname>follow_command</varname> can be user-defined scripts,
+      so &repmgr; will not apply <option>pg_bindir</option> even if excuting &repmgr;. Always provide the full
+      path; see <xref linkend="repmgrd-automatic-failover-configuration"> for more details.
+    </para>
+  </sect2>
+
+  <sect2 id="faq-repmgrd-startup-no-upstream" xreflabel="repmgrd does not start if upstream node is not running">
+    <title>
+      <application>repmgrd</application> aborts startup with the error "<literal>upstream node must be running before repmgrd can start</literal>"
+    </title>
+    <para>
+      <application>repmgrd</application> does this to avoid starting up on a replication cluster
+      which is not in a healthy state. If the upstream is unavailable, <application>repmgrd</application>
+      may initiate a failover immediately after starting up, which could have unintended side-effects,
+      particularly if <application>repmgrd</application> is not running on other nodes.
+    </para>
+    <para>
+      In particular, it's possible that the node's local copy of the <literal>repmgr.nodes</literal> copy
+      is out-of-date, which may lead to incorrect failover behaviour.
+    </para>
+    <para>
+      The onus is therefore on the adminstrator to manually set the cluster to a stable, healthy state before
+      starting <application>repmgrd</application>.
+    </para>
+  </sect2>
+
  </sect1>
 </appendix>

doc/appendix-packages.sgml

@@ -1,48 +1,126 @@
 <appendix id="appendix-packages" xreflabel="Package details">
- <indexterm>
-  <primary>packages</primary>
- </indexterm>
+  <indexterm>
+    <primary>packages</primary>
+  </indexterm>
 
- <title>&repmgr; package details</title>
- <para>
-   This section provides technical details about various &repmgr; binary
-   packages, such as location of the installed binaries and
-   configuration files.
- </para>
-
- <sect1 id="packages-centos" xreflabel="CentOS packages">
-  <title>CentOS, RHEL, Scientific Linux etc.</title>
+  <title>&repmgr; package details</title>
   <para>
-    Currently packages are provided for versions 6.x and 7.x of CentOS et al.
+    This section provides technical details about various &repmgr; binary
+    packages, such as location of the installed binaries and
+    configuration files.
   </para>
 
-  <note>
+  <sect1 id="packages-centos" xreflabel="CentOS packages">
+    <title>CentOS Packages</title>
+
+    <indexterm>
+      <primary>packages</primary>
+      <secondary>CentOS packages</secondary>
+    </indexterm>
+
+    <indexterm>
+      <primary>CentOS</primary>
+      <secondary>package information</secondary>
+    </indexterm>
+
     <para>
-      For PostgreSQL 9.6 and lower, the CentOS packages use a mixture of <literal>9.6</literal>
-      and <literal>96</literal> in various places to designate the major version;
-      from PostgreSQL 10, the first part of the version number (e.g. <literal>10</literal>) is
-      the major version, so there is more consistency in file/path/package naming.
+      Currently, &repmgr; RPM packages are provided for versions 6.x and 7.x of CentOS. These should also
+      work on matching versions of Red Hat Enterprise Linux, Scientific Linux and Oracle Enterprise Linux;
+      together with CentOS, these are the same RedHat-based distributions for which the main community project
+      (PGDG) provides packages (see the <ulink url="https://yum.postgresql.org/">PostgreSQL RPM Building Project</ulink>
+      page for details).
     </para>
-  </note>
+
+    <para>
+      Note these &repmgr; RPM packages are not designed to work with SuSE/OpenSuSE.
+    </para>
+
+    <note>
+      <para>
+        &repmgr; packages are designed to be compatible with community-provided PostgreSQL packages.
+        They may not work with vendor-specific packages such as those provided by RedHat for RHEL
+        customers, as the filesystem layout may be different to the community RPMs.
+        Please contact your support vendor for assistance.
+      </para>
+    </note>
+
+    <sect2 id="packages-centos-repositories">
+      <title>CentOS repositories</title>
+
+      <para>
+        &repmgr; packages are available from the public 2ndQuadrant repository, and also the
+        PostgreSQL community repository. The 2ndQuadrant repository is updated immediately
+        after each
+        &repmgr; release.
+      </para>
+
+      <table id="centos-2ndquadrant-repository">
+        <title>2ndQuadrant public repository</title>
+        <tgroup cols="2">
+          <tbody>
+            <row>
+              <entry>Repository URL:</entry>
+              <entry><ulink url="https://dl.2ndquadrant.com/">https://dl.2ndquadrant.com/</ulink></entry>
+            </row>
+            <row>
+              <entry>Repository documentation:</entry>
+              <entry><ulink url="https://repmgr.org/docs/4.1/installation-packages.html#INSTALLATION-PACKAGES-REDHAT-2NDQ">https://repmgr.org/docs/4.1/installation-packages.html#INSTALLATION-PACKAGES-REDHAT-2NDQ</ulink></entry>
+            </row>
+          </tbody>
+        </tgroup>
+      </table>
+
+      <table id="centos-pgdg-repository">
+        <title>PostgreSQL community repository (PGDG)</title>
+        <tgroup cols="2">
+          <tbody>
+            <row>
+              <entry>Repository URL:</entry>
+              <entry><ulink url="https://yum.postgresql.org/repopackages.php">https://yum.postgresql.org/repopackages.php</ulink></entry>
+            </row>
+            <row>
+              <entry>Repository documentation:</entry>
+              <entry><ulink url="https://yum.postgresql.org/">https://yum.postgresql.org/</ulink></entry>
+            </row>
+          </tbody>
+        </tgroup>
+      </table>
+
+    </sect2>
+
+    <sect2 id="packages-centos-details">
+      <title>CentOS package details</title>
+
+      <para>
+        The two tables below list relevant information, paths, commands etc. for the &repmgr; packages on
+        CentOS 7 (with systemd) and CentOS 6 (no systemd). Substitute the appropriate PostgreSQL major
+        version number for your installation.
+      </para>
+
+      <note>
+        <para>
+          For PostgreSQL 9.6 and lower, the CentOS packages use a mixture of <literal>9.6</literal>
+          and <literal>96</literal> in various places to designate the major version; e.g. the
+          package name is <literal>repmgr96</literal>, but the binary directory is
+          <filename>/var/lib/pgsql/9.6/data</filename>.
+        </para>
+        <para>
+          From PostgreSQL 10, the first part of the version number (e.g. <literal>10</literal>) is
+          the major version, so there is more consistency in file/path/package naming
+          (package <literal>repmgr10</literal>, binary directory <filename>/var/lib/pgsql/10/data</filename>).
+        </para>
+      </note>
+
 
   <table id="centos-7-packages">
    <title>CentOS 7 packages</title>
 
    <tgroup cols="2">
     <tbody>
-     <row>
-      <entry>Repository URL:</entry>
-      <entry><ulink url="https://yum.postgresql.org/repopackages.php">https://yum.postgresql.org/repopackages.php</ulink></entry>
-     </row>
-
-     <row>
-      <entry>Repository documentation:</entry>
-      <entry><ulink url="https://yum.postgresql.org/">https://yum.postgresql.org/</ulink></entry>
-     </row>
 
      <row>
       <entry>Package name example:</entry>
-      <entry><filename>repmgr10-4.0.0-1.rhel7.x86_64</filename></entry>
+      <entry><filename>repmgr10-4.0.4-1.rhel7.x86_64</filename></entry>
      </row>
 
      <row>
@@ -52,7 +130,7 @@
 
      <row>
       <entry>Installation command:</entry>
-      <entry><literal>yum install -y repmgr10</literal></entry>
+      <entry><literal>yum install repmgr10</literal></entry>
      </row>
 
      <row>
@@ -61,7 +139,7 @@
      </row>
 
      <row>
-      <entry>In default path:</entry>
+      <entry>repmgr in default path:</entry>
       <entry>NO</entry>
      </row>
 
@@ -70,9 +148,14 @@
       <entry><filename>/etc/repmgr/10/repmgr.conf</filename></entry>
      </row>
 
+     <row>
+      <entry>Data directory:</entry>
+      <entry><filename>/var/lib/pgsql/10/data</filename></entry>
+     </row>
+
      <row>
       <entry>repmgrd service command:</entry>
-      <entry><literal>service repmgr10</literal></entry>
+      <entry><command>systemctl [start|stop|restart|reload] repmgr10</command></entry>
      </row>
 
      <row>
@@ -82,7 +165,7 @@
 
      <row>
       <entry>repmgrd log file location:</entry>
-      <entry>(not specified)</entry>
+      <entry>(not specified by package; set in <filename>repmgr.conf</filename>)</entry>
      </row>
 
     </tbody>
@@ -94,29 +177,20 @@
 
    <tgroup cols="2">
     <tbody>
-     <row>
-      <entry>Repository URL:</entry>
-      <entry><ulink url="https://yum.postgresql.org/repopackages.php">https://yum.postgresql.org/repopackages.php</ulink></entry>
-     </row>
-
-     <row>
-      <entry>Repository documentation:</entry>
-      <entry><ulink url="https://yum.postgresql.org/">https://yum.postgresql.org/</ulink></entry>
-     </row>
 
      <row>
       <entry>Package name example:</entry>
-      <entry><filename>repmgr96-4.0.0-1.rhel6.x86_64</filename></entry>
+      <entry><filename>repmgr96-4.0.4-1.rhel6.x86_64</filename></entry>
      </row>
 
      <row>
       <entry>Metapackage:</entry>
-      <entry>NO</entry>
+      <entry>(none)</entry>
      </row>
 
      <row>
       <entry>Installation command:</entry>
-      <entry><literal>yum install -y repmgr96</literal></entry>
+      <entry><literal>yum install repmgr96</literal></entry>
      </row>
 
      <row>
@@ -125,7 +199,7 @@
      </row>
 
      <row>
-      <entry>In default path:</entry>
+      <entry>repmgr in default path:</entry>
       <entry>NO</entry>
      </row>
 
@@ -134,9 +208,14 @@
       <entry><filename>/etc/repmgr/9.6/repmgr.conf</filename></entry>
      </row>
 
+     <row>
+      <entry>Data directory:</entry>
+      <entry><filename>/var/lib/pgsql/9.6/data</filename></entry>
+     </row>
+
      <row>
       <entry>repmgrd service command:</entry>
-      <entry>service repmgr-9.6</entry>
+      <entry><literal>service [start|stop|restart|reload] repmgr-9.6</literal></entry>
      </row>
 
      <row>
@@ -153,6 +232,331 @@
    </tgroup>
   </table>
 
-
+    </sect2>
  </sect1>
+
+
+
+
+  <sect1 id="packages-debian-ubuntu" xreflabel="Debian/Ubuntu packages">
+    <title>Debian/Ubuntu Packages</title>
+    <indexterm>
+      <primary>packages</primary>
+      <secondary>Debian/Ubuntu packages</secondary>
+    </indexterm>
+
+    <indexterm>
+      <primary>Debian/Ubuntu</primary>
+      <secondary>package information</secondary>
+    </indexterm>
+
+    <para>
+      &repmgr; <literal>.deb</literal> packages are provided via the
+      PostgreSQL Community APT repository, and are available for each community-supported
+      PostgreSQL version, currently supported Debian releases, and currently supported
+      Ubuntu LTS releases.
+    </para>
+
+    <sect2 id="packages-apt-repository">
+      <title>APT repository</title>
+
+      <para>
+        &repmgr; packages are available from the  PostgreSQL Community APT repository,
+        which is updated immediately after each &repmgr; release.
+      </para>
+
+
+      <table id="apt-2ndquadrant-repository">
+        <title>2ndQuadrant public repository</title>
+        <tgroup cols="2">
+          <tbody>
+            <row>
+              <entry>Repository URL:</entry>
+              <entry><ulink url="https://dl.2ndquadrant.com/">https://dl.2ndquadrant.com/</ulink></entry>
+            </row>
+            <row>
+              <entry>Repository documentation:</entry>
+              <entry><ulink url="https://repmgr.org/docs/4.1/installation-packages.html#INSTALLATION-PACKAGES-DEBIAN">https://repmgr.org/docs/4.1/installation-packages.html#INSTALLATION-PACKAGES-DEBIAN</ulink></entry>
+            </row>
+          </tbody>
+        </tgroup>
+      </table>
+
+
+      <table id="apt-repository">
+        <title>PostgreSQL Community APT repository (PGDG)</title>
+        <tgroup cols="2">
+          <tbody>
+            <row>
+              <entry>Repository URL:</entry>
+              <entry><ulink url="http://apt.postgresql.org/">http://apt.postgresql.org/</ulink></entry>
+            </row>
+            <row>
+              <entry>Repository documentation:</entry>
+              <entry><ulink url="https://wiki.postgresql.org/wiki/Apt)">https://wiki.postgresql.org/wiki/Apt)</ulink></entry>
+            </row>
+          </tbody>
+        </tgroup>
+      </table>
+    </sect2>
+
+   <sect2 id="packages-debian-details">
+      <title>Debian/Ubuntu package details</title>
+
+      <para>
+        The table below lists relevant information, paths, commands etc. for the &repmgr; packages on
+        Debian 9.x ("Stretch"). Substitute the appropriate PostgreSQL major
+        version number for your installation.
+      </para>
+      <para>
+        See also <xref linkend="repmgrd-configuration-debian-ubuntu"> for some specifics related
+        to configuring the <application>repmgrd</application> daemon.
+      </para>
+
+      <table id="debian-9-packages">
+        <title>Debian 9.x packages</title>
+
+        <tgroup cols="2">
+          <tbody>
+
+            <row>
+              <entry>Package name example:</entry>
+              <entry><filename>postgresql-10-repmgr</filename></entry>
+            </row>
+
+            <row>
+              <entry>Metapackage:</entry>
+              <entry><filename>repmgr-common</filename></entry>
+            </row>
+
+            <row>
+              <entry>Installation command:</entry>
+              <entry><literal>apt-get install postgresql-10-repmgr</literal></entry>
+            </row>
+
+            <row>
+              <entry>Binary location:</entry>
+              <entry><filename>/usr/lib/postgresql/10/bin</filename></entry>
+            </row>
+
+            <row>
+              <entry>repmgr in default path:</entry>
+              <entry>Yes (via wrapper script <filename>/usr/bin/repmgr</filename>)</entry>
+            </row>
+
+            <row>
+              <entry>Configuration file location:</entry>
+              <entry>(not set by package)</entry>
+            </row>
+
+            <row>
+              <entry>Data directory:</entry>
+              <entry><filename>/var/lib/postgresql/10/main</filename></entry>
+            </row>
+
+            <row>
+              <entry>PostgreSQL service command:</entry>
+              <entry><command>systemctl [start|stop|restart|reload] postgresql@10-main</command></entry>
+
+            </row>
+
+            <row>
+              <entry>repmgrd service command:</entry>
+              <entry><command>systemctl [start|stop|restart|reload] repmgrd</command></entry>
+            </row>
+
+            <row>
+              <entry>repmgrd service file location:</entry>
+              <entry><filename>/etc/init.d/repmgrd</filename> (defaults in: <filename>/etc/defaults/repmgrd</filename>)</entry>
+            </row>
+
+            <row>
+              <entry>repmgrd log file location:</entry>
+              <entry>(not specified by package; set in <filename>repmgr.conf</filename>)</entry>
+            </row>
+
+          </tbody>
+        </tgroup>
+      </table>
+      <note>
+        <para>
+          Instead of using the <application>systemd</application> service command directly,
+          it's recommended to execute <command>pg_ctlcluster</command> (as <literal>root</literal>,
+          either directly or via <command>sudo</command>), e.g.:
+          <programlisting>
+            <command>pg_ctlcluster 10 main [start|stop|restart|reload]</command></programlisting>
+        </para>
+        <para>
+          For pre-<application>systemd</application> systems, <command>pg_ctlcluster</command>
+          can be executed directly by the <literal>postgres</literal> user.
+        </para>
+      </note>
+   </sect2>
+
+  </sect1>
+
+  <sect1 id="packages-snapshot" xreflabel="Snapshot packages">
+    <title>Snapshot packages</title>
+    <indexterm>
+      <primary>snapshot packages</primary>
+    </indexterm>
+    <indexterm>
+      <primary>packages</primary>
+      <secondary>snaphots</secondary>
+    </indexterm>
+
+    <para>
+      For testing new features and bug fixes, from time to time 2ndQuadrant provides
+      so-called &quot;snapshot packages&quot; via its public repository. These packages
+      are built from the &repmgr; source at a particular point in time, and are not formal
+      releases.
+    </para>
+    <note>
+      <para>
+        We do not recommend installing these packages in a production environment
+        unless specifically advised.
+      </para>
+    </note>
+    <para>
+      To install a snapshot package, it's necessary to install the 2ndQuadrant public snapshot repository,
+      following the instructions here: <ulink url="https://dl.2ndquadrant.com/default/release/site/">https://dl.2ndquadrant.com/default/release/site/</ulink> but replace <literal>release</literal> with <literal>snapshot</literal>
+      in the appropriate URL.
+    </para>
+    <para>
+      For example, to install the snapshot RPM repository for PostgreSQL 9.6, execute (as <literal>root</literal>):
+      <programlisting>
+curl https://dl.2ndquadrant.com/default/snapshot/get/9.6/rpm | bash</programlisting>
+
+      or as a normal user with root sudo access:
+      <programlisting>
+curl https://dl.2ndquadrant.com/default/snapshot/get/9.6/rpm | sudo bash</programlisting>
+    </para>
+    <para>
+      Alternatively you can browse the repository here:
+      <ulink url="https://dl.2ndquadrant.com/default/snapshot/browse/">https://dl.2ndquadrant.com/default/snapshot/browse/</ulink>.
+    </para>
+    <para>
+      Once the repository is installed, installing or updating &repmgr; will result in the latest snapshot
+      package being installed.
+    </para>
+    <para>
+      The package name will be formatted like this:
+      <programlisting>
+repmgr96-4.1.1-0.0git320.g5113ab0.1.el7.x86_64.rpm</programlisting>
+      containg the snapshot build number (here: <literal>320</literal>) and the hash
+      of the <application>git</application> commit it was built from (here: <literal>g5113ab0</literal>).
+    </para>
+
+    <para>
+      Note that the next formal release (in the above example <literal>4.1.1</literal>), once available,
+      will install in place of any snapshot builds.
+    </para>
+
+  </sect1>
+
+  <sect1 id="packages-old-versions" xreflabel="Installing old package versions">
+    <title>Installing old package versions</title>
+    <indexterm>
+      <primary>old packages</primary>
+    </indexterm>
+    <indexterm>
+      <primary>packages</primary>
+      <secondary>old versions</secondary>
+    </indexterm>
+
+    <sect2 id="packages-old-versions-debian" xreflabel="old Debian package versions">
+      <title>Debian/Ubuntu</title>
+      <para>
+        An archive of old packages (<literal>3.3.2</literal> and later) for Debian/Ubuntu-based systems is available here:
+        <ulink url="http://atalia.postgresql.org/morgue/r/repmgr/">http://atalia.postgresql.org/morgue/r/repmgr/</ulink>
+      </para>
+    </sect2>
+
+    <sect2 id="packages-old-versions-rhel-centos" xreflabel="old RHEL/CentOS package versions">
+      <title>RHEL/CentOS</title>
+      <para>
+        Old RPM packages (<literal>3.2</literal> and later) can be retrieved from the
+        (deprecated) 2ndQuadrant repository at
+        <ulink url="http://packages.2ndquadrant.com/">http://packages.2ndquadrant.com/</ulink>
+        by installing the appropriate repository RPM:
+      </para>
+
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <ulink url="http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-fedora-1.0-1.noarch.rpm">http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-fedora-1.0-1.noarch.rpm</ulink>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <ulink url="http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-rhel-1.0-1.noarch.rpm">http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-rhel-1.0-1.noarch.rpm</ulink>
+          </simpara>
+        </listitem>
+
+      </itemizedlist>
+
+      <para>
+        Old versions can be located with e.g.:
+        <programlisting>
+          yum --showduplicates list repmgr96</programlisting>
+        (substitute the appropriate package name; see <xref linkend="packages-centos">) and installed with:
+        <programlisting>
+          yum install {package_name}-{version}</programlisting>
+        where <literal>{package_name}</literal> is the base package name (e.g. <literal>repmgr96</literal>)
+        and <literal>{version}</literal> is the version listed by the
+        <command> yum --showduplicates list ...</command> command, e.g. <literal>4.0.6-1.rhel6</literal>.
+      </para>
+      <para>For example:
+        <programlisting>
+          yum install repmgr96-4.0.6-1.rhel6</programlisting>
+      </para>
+
+    </sect2>
+  </sect1>
+
+
+  <sect1 id="packages-packager-info" xreflabel="Information for packagers">
+    <title>Information for packagers</title>
+    <indexterm>
+      <primary>packages</primary>
+      <secondary>information for packagers</secondary>
+    </indexterm>
+    <para>
+      We recommend patching the following parameters when
+      building the package as built-in default values for user convenience.
+      These values can nevertheless be overridden by the user, if desired.
+    </para>
+    <itemizedlist>
+      <listitem>
+        <para>
+          Configuration file location: the default configuration file location
+          can be hard-coded by patching <varname>package_conf_file</varname>
+          in <filename>configfile.c</filename>:
+          <programlisting>
+		/* packagers: if feasible, patch configuration file path into "package_conf_file" */
+		char		package_conf_file[MAXPGPATH] = "";</programlisting>
+        </para>
+        <para>
+          See also: <xref linkend="configuration-file">
+        </para>
+      </listitem>
+
+      <listitem>
+        <para>
+          PID file location: the default <application>repmgrd</application> PID file
+          location can be hard-coded by patching <varname>package_pid_file</varname>
+          in <filename>repmgrd.c</filename>:
+          <programlisting>
+		/* packagers: if feasible, patch PID file path into "package_pid_file" */
+		char		package_pid_file[MAXPGPATH] = "";</programlisting>
+        </para>
+        <para>
+          See also: <xref linkend="repmgrd-pid-file">
+        </para>
+      </listitem>
+
+    </itemizedlist>
+  </sect1>
 </appendix>

doc/appendix-release-notes.sgml

@@ -15,9 +15,763 @@
     See also: <xref linkend="upgrading-repmgr">
   </para>
 
+  <sect1 id="release-4.2">
+    <title>Release 4.2</title>
+    <para><emphasis>???, 2018</emphasis></para>
+    <para>
+    </para>
+
+    <sect2>
+      <title>Configuration file changes</title>
+      <para>
+        <itemizedlist>
+          <listitem>
+            <para>
+              New parameter <varname>shutdown_check_timeout</varname> (default: 60 seconds) added;
+              this provides an explicit timeout for
+              <command><link linkend="repmgr-standby-switchover">repmgr standby switchover</link></command>
+              to check that the demotion candidate (current primary) has shut down. Previously, the parameters
+              <literal>reconnect_attempts</literal> and <literal>reconnect_interval</literal>
+              were used to calculate a timeout, but these are actually
+              intended for primary failure detection. (GitHub #504).
+            </para>
+          </listitem>
+        </itemizedlist>
+
+        <itemizedlist>
+          <listitem>
+            <para>
+              New parameter <varname>repmgr_bindir</varname> added, to facilitate remote invocation of repmgr
+              when the repmgr binary is located somewhere other than the PostgreSQL binary directory, as it
+              cannot be assumed all package maintainers will install &repmgr; there.
+            </para>
+            <para>
+              This parameter is optional; if not set (the default), &repmgr; will fall back
+              to <option>pg_bindir</option> (if set).
+            </para>
+            <para>
+              (GitHub #246).
+            </para>
+          </listitem>
+        </itemizedlist>
+      </para>
+
+    </sect2>
+
+    <sect2>
+      <title>repmgr enhancements</title>
+      <para>
+       <itemizedlist>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-cluster-cleanup">repmgr cluster cleanup</link></command>
+              now accepts the <option>--node-id</option> option to delete records for only one
+              node. (GitHub #493).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              When running
+              <command><link linkend="repmgr-cluster-matrix">repmgr cluster matrix</link></command> and
+              <command><link linkend="repmgr-cluster-crosscheck">repmgr cluster crosscheck</link></command>,
+              &repmgr; will report nodes unreachable via SSH, and emit return code <literal>ERR_BAD_SSH</literal>.
+              (GitHub #246).
+            </para>
+            <note>
+              <para>
+                Users relying on
+                <command><link linkend="repmgr-cluster-crosscheck">repmgr cluster crosscheck</link></command>
+                to return a non-zero return code as a way of detecting connectivity errors should be aware
+                that <literal>ERR_BAD_SSH</literal> will be returned if there is an SSH connection error
+                from the node where the command is executed, even if the command is able to establish
+                that PostgreSQL connectivity is fine. Therefore the exact return code should be checked
+                to determine what kind of connectivity error has been detected.
+              </para>
+            </note>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>repmgrd enhancements</title>
+      <para>
+       <itemizedlist>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application> can now be &quot;paused&quot;, i.e. instructed
+              not to take any action such as a failover, even if the prerequisites for such an
+              action are detected.
+            </para>
+            <para>
+              This removes the need to stop <application>repmgrd</application> on all nodes when
+              performing a planned operation such as a switchover.
+            </para>
+            <para>
+              For further details, see <link linkend="repmgrd-pausing">Pausing repmgrd</link>.
+            </para>
+          </listitem>
+
+       </itemizedlist>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Bug fixes</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              &repmgr;: fix &quot;Missing replication slots&quot; label in
+              <command><link linkend="repmgr-node-check">repmgr node check</link></command>.  (GitHub #507)
+            </para>
+          </listitem>
+
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: fix parsing of <option>-d/--daemonize</option> option.
+            </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+    </sect2>
+  </sect1>
+
+  <sect1 id="release-4.1.1">
+    <title>Release 4.1.1</title>
+    <para><emphasis>Wed September 5, 2018</emphasis></para>
+    <para>
+      repmgr 4.1.1 contains a number of usability enhancements and bug fixes.
+    </para>
+    <para>
+	  We recommend upgrading to this version as soon as possible.
+	  This release can be installed as a simple package upgrade from repmgr 4.0 ~ 4.1.0;
+      <application>repmgrd</application> (if running) should be restarted.
+      See <xref linkend="upgrading-repmgr"> for more details.
+	</para>
+
+    <sect2>
+      <title>repmgr enhancements</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-standby-switchover">repmgr standby switchover --dry-run</link></command>
+              no longer copies external configuration files to test they can be copied; this avoids making
+              any changes to the target system. (GitHub #491).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-cluster-cleanup">repmgr cluster cleanup</link></command>:
+              add <literal>cluster_cleanup</literal> event. (GitHub #492).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-standby-switchover">repmgr standby switchover</link></command>:
+              improve detection of free walsenders. (GitHub #495).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Improve messages emitted during
+              <command><link linkend="repmgr-standby-promote">repmgr standby promote</link></command>.
+            </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+   </sect2>
+
+
+    <sect2>
+      <title>repmgrd enhancements</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              Always reopen the log file after
+              receiving <literal>SIGHUP</literal>. Previously this only happened if
+              a configuration file change was detected.
+              (GitHub #485).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Report version number <emphasis>after</emphasis>
+              logger initialisation. (GitHub #487).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Improve cascaded standby failover handling. (GitHub #480).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Improve reconnection handling after brief network outages; if
+              monitoring data being collected, this could lead to orphaned
+              sessions on the primary. (GitHub #480).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Check <varname>promote_command</varname> and <varname>follow_command</varname>
+              are defined when reloading configuration. These were checked on startup but
+              not reload by <application>repmgrd</application>, which made it possible to
+              make <application>repmgrd</application> with invalid values. It's unlikely
+              anyone would want to do this, but we should make it impossible anyway.
+              (GitHub #486).
+            </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Other</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              Text of any failed queries will now be logged as <literal>ERROR</literal> to assist
+              logfile analysis at log levels higher than <literal>DEBUG</literal>.
+              (GitHub #498).
+            </para>
+          </listitem>
+        </itemizedlist>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Bug fixes</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-node-rejoin">repmgr node rejoin</link></command>:
+              remove new upstream's replication slot if it still exists on the rejoined
+              standby. (GitHub #499).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: fix startup on witness node when local data is stale. (GitHub #488, #489).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Truncate version string reported by PostgreSQL if necessary; some
+              distributions insert additional detail after the actual version.
+              (GitHub #490).
+            </para>
+          </listitem>
+
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+
+  </sect1>
+
+
+
+  <sect1 id="release-4.1.0">
+    <title>Release 4.1.0</title>
+    <para><emphasis>Tue July 31, 2018</emphasis></para>
+    <para>
+      &repmgr; 4.1.0 introduces some changes to <application>repmgrd</application>
+      behaviour and some additional configuration parameters.
+    </para>
+    <para>
+      This release can be installed as a simple package upgrade from repmgr 4.0 ~ 4.0.6.
+      The following post-upgrade steps must be carried out:
+
+       <itemizedlist>
+          <listitem>
+            <para>
+              Execute <command>ALTER EXTENSION repmgr UPDATE</command>
+              on the primary server in the database where &repmgr; is installed.
+            </para>
+          </listitem>
+          <listitem>
+            <para>
+              <application>repmgrd</application> must be restarted on all nodes where it is running.
+            </para>
+          </listitem>
+
+       </itemizedlist>
+
+       A restart of the PostgreSQL server is <emphasis>not</emphasis> required
+       for this release (unless upgrading from repmgr 3.x).
+    </para>
+    <para>
+       See <xref linkend="upgrading-repmgr-extension"> for more details.
+    </para>
+
+    <para>
+      Configuration changes are backwards-compatible and no changes to
+      <filename>repmgr.conf</filename> are required. However users should
+      review the changes listed below.
+    </para>
+
+    <note>
+      <para>
+        <emphasis>Repository changes</emphasis>
+      </para>
+      <para>
+        Coinciding with this release, the 2ndQuadrant repository structure has changed.
+        See section <xref linkend="installation-packages"> for details, particularly
+        if you are using a RPM-based system.
+      </para>
+    </note>
+
+    <sect2>
+      <title>Configuration file changes</title>
+
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              Default for <xref linkend="repmgr-conf-log-level"> is now <option>INFO</option>.
+              This produces additional informative log output, without creating excessive additional
+              log file volume, and matches the setting assumed for examples in the documentation.
+              (GitHub #470).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <varname>recovery_min_apply_delay</varname> now accepts a minimum value
+              of <literal>zero</literal> (GitHub #448).
+            </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+
+    </sect2>
+
+
+    <sect2>
+      <title>repmgr enhancements</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              <application>repmgr</application>: always exit with an error if an unrecognised
+              command line option is provided. This matches the behaviour of other PostgreSQL
+              utilities such as <application>psql</application>. (GitHub #464).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgr</application>: add <option>-q/--quiet</option> option to suppress non-error
+              output. (GitHub #468).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-cluster-show">repmgr cluster show</link></command>,
+              <command><link linkend="repmgr-node-check">repmgr node check</link></command> and
+              <command><link linkend="repmgr-node-status">repmgr node status</link></command>
+              return non-zero exit code if node status issues detected. (GitHub #456).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Add <option>--csv</option> output option for
+              <command><link linkend="repmgr-cluster-event">repmgr cluster event</link></command>.
+              (GitHub #471).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-witness-unregister">repmgr witness unregister</link></command>
+			  can be run on any node, by providing the ID of the witness node with <option>--node-id</option>.
+			  (GitHub #472).
+			</para>
+		  </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-standby-switchover">repmgr standby switchover</link></command>
+              will refuse to run if an exclusive backup is taking place on the current primary.
+			  (GitHub #476).
+			</para>
+		  </listitem>
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>repmgrd enhancements</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: create a PID file by default
+              (GitHub #457). For details, see <xref linkend="repmgrd-pid-file">.
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: daemonize process by default.
+			  In case, for whatever reason, the user does not wish to daemonize the
+			  process, provide <option>--daemonize=false</option>.
+			  (GitHub #458).
+            </para>
+          </listitem>
+
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+
+    <sect2>
+      <title>Bug fixes</title>
+      <para>
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-standby-register">repmgr standby register --wait-sync</link></command>:
+              fix behaviour when no timeout provided.
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-cluster-cleanup">repmgr cluster cleanup</link></command>:
+			  add missing help options. (GitHub #461/#462).
+			</para>
+		  </listitem>
+
+          <listitem>
+            <para>
+			  Ensure witness node follows new primary after switchover. (GitHub #453).
+			</para>
+		  </listitem>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-node-check">repmgr node check</link></command> and
+              <command><link linkend="repmgr-node-status">repmgr node status</link></command>:
+			  fix witness node handling. (GitHub #451).
+			</para>
+		  </listitem>
+
+          <listitem>
+            <para>
+              When using <command><link linkend="repmgr-standby-clone">repmgr standby clone</link></command>
+              with <option>--recovery-conf-only</option> and replication slots, ensure
+              <varname>primary_slot_name</varname> is set correctly. (GitHub #474).
+            </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+  </sect1>
+
+  <sect1 id="release-4.0.6">
+    <title>Release 4.0.6</title>
+    <para><emphasis>Thu June 14, 2018</emphasis></para>
+    <para>
+	  &repmgr; 4.0.6 contains a number of bug fixes and usability enhancements.
+    </para>
+	<para>
+	  We recommend upgrading to this version as soon as possible.
+	  This release can be installed as a simple package upgrade from repmgr 4.0 ~ 4.0.5;
+      <application>repmgrd</application> (if running) should be restarted. See <xref linkend="upgrading-repmgr">
+      for more details.
+	</para>
+
+    <sect2>
+      <title>Usability enhancements</title>
+
+      <para>
+        <itemizedlist>
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-cluster-crosscheck">repmgr cluster crosscheck</link></command> and
+              <command><link linkend="repmgr-cluster-matrix">repmgr cluster matrix</link></command>:
+              return non-zero exit code if node connection issues detected (GitHub #447)
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+               <command><link linkend="repmgr-standby-clone">repmgr standby clone</link></command>:
+			   Improve handling of external configuration file copying,  including consideration in
+			   <option>--dry-run</option> check
+			   (GitHub #443)
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              When using <option>--dry-run</option>, force log level to <literal>INFO</literal>
+			  to ensure output will always be displayed
+			  (GitHub #441)
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+               <command><link linkend="repmgr-standby-clone">repmgr standby clone</link></command>:
+			   Improve documentation of <option>--recovery-conf-only</option> mode
+			   (GitHub #438)
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+               <command><link linkend="repmgr-standby-clone">repmgr standby clone</link></command>:
+			   Don't require presence of <varname>user</varname> parameter in conninfo string
+			   (GitHub #437)
+           </para>
+          </listitem>
+
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+    <sect2>
+      <title>Bug fixes</title>
+      <para>
+
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-witness-register">repmgr witness register</link></command>:
+              prevent registration of a witness server with the same name as an existing node
+           </para>
+          </listitem>
+
+
+          <listitem>
+            <para>
+               <command><link linkend="repmgr-standby-follow">repmgr standby follow</link></command>:
+			   check node has actually connected to new primary before reporting success
+			   (GitHub #444)
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+               <command><link linkend="repmgr-node-rejoin">repmgr node rejoin</link></command>:
+			   Fix bug when parsing <option>--config-files</option> parameter
+			   (GitHub #442)
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: ensure local node is counted as quorum member
+			  (GitHub #439)
+           </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+    </sect2>
+
+  </sect1>
+
+  <sect1 id="release-4.0.5">
+    <title>Release 4.0.5</title>
+    <para><emphasis>Wed May 2, 2018</emphasis></para>
+    <para>
+      &repmgr; 4.0.5 contains a number of usability enhancements related to
+      <application>pg_rewind</application> usage, <filename>recovery.conf</filename>
+      generation and (in <application>repmgrd</application>) handling of various
+      corner-case situations, as well as a number of bug fixes.
+    </para>
+
+    <sect2>
+      <title>Usability enhancements</title>
+
+      <para>
+        <itemizedlist>
+          <listitem>
+            <para>
+              Various documentation improvements, with particular emphasis on
+              the importance of setting appropriate <link linkend="configuration-file-service-commands">service commands</link>
+              instead of relying on <application>pg_ctl</application>.
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Poll demoted primary after restart as a standby during a switchover operation (GitHub #408).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Add configuration parameter <option>config_directory</option> (GitHub #424).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Add sanity check if <option>--upstream-node-id</option> not supplied when executing
+              <xref linkend="repmgr-standby-register"> (GitHub #395).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Enable <link linkend="repmgr-node-rejoin-pg-rewind">pg_rewind</link> to be used with
+              PostgreSQL 9.3/9.4 (GitHub #413).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              When generating replication connection strings, set <literal>dbname=replication</literal>
+              if appropriate (GitHub #421).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Enable provision of <option>archive_cleanup_command</option> in <filename>recovery.conf</filename>
+              (GitHub #416).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Actively check for node to <link linkend="repmgr-node-rejoin">rejoin</link> cluster (GitHub #415).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: set <literal>connect_timeout=2</literal> (if not explicitly set)
+              when pinging a server.
+           </para>
+          </listitem>
+
+        </itemizedlist>
+      </para>
+
+    </sect2>
+
+   <sect2>
+      <title>Bug fixes</title>
+      <para>
+
+        <itemizedlist>
+
+          <listitem>
+            <para>
+              Fix display of conninfo parsing error messages.
+           </para>
+          </listitem>
+
+
+          <listitem>
+            <para>
+              Fix minimum accepted value for <varname>degraded_monitoring_timeout</varname> (GitHub #411).
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Fix superuser password handling (GitHub #400)
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Fix parsing of <varname>archive_ready_critical</varname> configuration file parameter (GitHub #426).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              Fix <command><link linkend="repmgr-cluster-crosscheck">repmgr cluster crosscheck</link></command>
+              output (GitHub #389)
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+               Fix memory leaks in witness code (GitHub #402).
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: handle <command>pg_ctl promote</command> timeout (GitHub #425).
+           </para>
+          </listitem>
+
+          <listitem>
+            <para>
+              <application>repmgrd</application>: handle failover situation with only two nodes in the primary
+          location, and at least one node in another location (GitHub #407).
+            </para>
+          </listitem>
+
+          <listitem>
+            <para>
+               <application>repmgrd</application>: prevent standby connection handle from going stale.
+           </para>
+          </listitem>
+
+
+
+        </itemizedlist>
+      </para>
+   </sect2>
+
+  </sect1>
+
+
   <sect1 id="release-4.0.4">
     <title>Release 4.0.4</title>
-    <para><emphasis>Thu Mar 8, 2018</emphasis></para>
+    <para><emphasis>Fri Mar 9, 2018</emphasis></para>
 
     <para>
       &repmgr; 4.0.4 contains some bug fixes and and a number of
@@ -30,6 +784,15 @@
       for more details.
     </para>
 
+    <note>
+      <para>
+        It is not possible to perform a switchover where the demotion candidate is
+        running &repmgr; 4.0.2 or lower; all nodes should be upgraded to the latest version (4.0.4).
+        This is due to additional checks introduced in 4.0.3 which require the presence of
+        4.0.3 or later versions on all nodes.
+      </para>
+    </note>
+
     <sect2>
       <title>Usability enhancements</title>
 
@@ -144,6 +907,14 @@
       This release can be installed as a simple package upgrade from repmgr 4.0 ~ 4.0.2;
       repmgrd (if running) should be restarted.
     </para>
+    <note>
+      <para>
+        It is not possible to perform a switchover where the demotion candidate is
+        running &repmgr; 4.0.2 or lower; all nodes should be upgraded to 4.0.3. This is due
+        to additional checks introduced in 4.0.3 which require the presence of
+        4.0.3 or later versions on all nodes.
+      </para>
+    </note>
     <sect2>
       <title>Usability enhancements</title>
 

doc/appendix-signatures.sgml

@@ -5,14 +5,14 @@
    <title>repmgr source code signing key</title>
    <para>
      The signing key ID used for <application>repmgr</application> source code bundles is:
-     <ulink url="http://packages.2ndquadrant.com/repmgr/SOURCE-GPG-KEY-repmgr">
+     <ulink url="https://repmgr.org/download/SOURCE-GPG-KEY-repmgr">
        <literal>0x297F1DCC</literal></ulink>.
    </para>
 
    <para>
      To download the <application>repmgr</application> source key to your computer:
      <programlisting>
-       curl -s http://packages.2ndquadrant.com/repmgr/SOURCE-GPG-KEY-repmgr | gpg --import
+       curl -s https://repmgr.org/download/SOURCE-GPG-KEY-repmgr | gpg --import
        gpg --fingerprint 0x297F1DCC
      </programlisting>
      then verify that the fingerprint is the expected value:
@@ -33,34 +33,5 @@
 
  </sect1>
 
- <sect1 id="repmgr-rpm-key" xreflabel="repmgr rpm key">
-   <title>repmgr RPM signing key</title>
-   <para>
-     The signing key ID used for <application>repmgr</application> source code bundles is:
-     <ulink url="http://packages.2ndquadrant.com/repmgr/RPM-GPG-KEY-repmgr">
-       <literal>0x702D883A</literal></ulink>.
-   </para>
-
-   <para>
-     To download the <application>repmgr</application> source key to your computer:
-     <programlisting>
-       curl -s http://packages.2ndquadrant.com/repmgr/RPM-GPG-KEY-repmgr | gpg --import
-       gpg --fingerprint 0x702D883A
-     </programlisting>
-     then verify that the fingerprint is the expected value:
-     <programlisting>
-       AE4E 390E A58E 0037 6148  3F29 888D 018B 702D 883A</programlisting>
-   </para>
-
-   <para>
-     To check a repository RPM, use <application>rpmkeys</application> to load the
-      packaging signing key into the RPM database then use <literal>rpm -K</literal>, e.g.:
-     <programlisting>
-       sudo rpmkeys --import http://packages.2ndquadrant.com/repmgr/RPM-GPG-KEY-repmgr
-       rpm -K postgresql-bdr94-2ndquadrant-redhat-1.0-2.noarch.rpm
-     </programlisting>
-   </para>
-
- </sect1>
 
 </appendix>

doc/cloning-standbys.sgml

@@ -51,7 +51,7 @@
    </itemizedlist>
    </para>
 
-  <sect2 id="cloning-from-barman-prerequisites" xreflabel="Prerequisites for cloning from Barman">
+  <sect2 id="cloning-from-barman-prerequisites">
    <title>Prerequisites for cloning from Barman</title>
    <para>
     In order to enable Barman support for <command>repmgr standby clone</command>, following
@@ -352,11 +352,13 @@
       provide additional parameters for <command>pg_basebackup</command> to customise the
       cloning process.
     </para>
+
     <para>
      By default, <command>pg_basebackup</command> performs a checkpoint before beginning the backup
      process. However, a normal checkpoint may take some time to complete;
-     a fast checkpoint can be forced with the <literal>-c/--fast-checkpoint</literal> option.
-     However this may impact performance of the server being cloned from (typically the primary)
+     a fast checkpoint can be forced with <command><link linkend="repmgr-standby-clone">repmgr standby clone</link></command>'s
+     <literal>-c/--fast-checkpoint</literal> option.
+     Note that this may impact performance of the server being cloned from (typically the primary)
      so should be used with care.
     </para>
     <tip>
@@ -370,6 +372,18 @@
       Other options can be passed to <command>pg_basebackup</command> by including them
       in the <filename>repmgr.conf</filename> setting <varname>pg_basebackup_options</varname>.
     </para>
+
+    <para>
+      Not that by default, &repmgr; executes <command>pg_basebackup</command> with <option>-X/--wal-method</option>
+      (PostgreSQL 9.6 and earlier: <option>-X/--xlog-method</option>) set to <literal>stream</literal>.
+      From PostgreSQL 9.6, if replication slots are in use, it will also create a replication slot before
+      running the base backup, and execute <command>pg_basebackup</command> with the
+      <option>-S/--slot</option> option set to the name of the previously created replication slot.
+    </para>
+    <para>
+      These parameters can set by the user in <varname>pg_basebackup_options</varname>, in which case they
+      will override the &repmgr; default values. However normally there's no reason to do this.
+    </para>
     <para>
       If using a separate directory to store WAL files, provide the option <literal>--waldir</literal>
       (<literal>--xlogdir</literal> in PostgreSQL 9.6 and earlier) with the absolute path to the
@@ -384,11 +398,16 @@
 
    <sect2 id="cloning-advanced-managing-passwords" xreflabel="Managing passwords">
     <title>Managing passwords</title>
+    <indexterm>
+      <primary>cloning</primary>
+      <secondary>using passwords</secondary>
+    </indexterm>
+
     <para>
      If replication connections to a standby's upstream server are password-protected,
-     the standby must be able to provide the password so it can begin streaming
-     replication.
+     the standby must be able to provide the password so it can begin streaming replication.
     </para>
+
     <para>
      The recommended way to do this is to store the password in the <literal>postgres</literal> system
      user's <filename>~/.pgpass</filename> file. It's also possible to store the password in the
@@ -396,6 +415,17 @@
      security reasons. For more details see the
      <ulink url="https://www.postgresql.org/docs/current/static/libpq-pgpass.html">PostgreSQL password file documentation</ulink>.
     </para>
+
+    <note>
+      <para>
+        If using a <filename>pgpass</filename> file, an entry for the replication user (by default the
+        user who connects to the <literal>repmgr</literal> database) <emphasis>must</emphasis>
+        be provided, with database name set to <literal>replication</literal>, e.g.:
+        <programlisting>
+          node1:5432:replication:repmgr:12345</programlisting>
+      </para>
+    </note>
+
     <para>
      If, for whatever reason, you wish to include the password in <filename>recovery.conf</filename>,
      set <varname>use_primary_conninfo_password</varname> to <literal>true</literal> in
@@ -407,8 +437,7 @@
     </para>
     <para>
      It is of course also possible to include the password value in the <varname>conninfo</varname>
-     string for each node, but this is obviously a security risk and should be
-     avoided.
+     string for each node, but this is obviously a security risk and should be avoided.
     </para>
     <para>
       From PostgreSQL 9.6, <application>libpq</application> supports the <varname>passfile</varname>

doc/configuration-file-log-settings.sgml

@@ -0,0 +1,107 @@
+<sect1 id="configuration-file-log-settings" xreflabel="log settings">
+  <indexterm>
+    <primary>repmgr.conf</primary>
+    <secondary>log settings</secondary>
+  </indexterm>
+  <indexterm>
+    <primary>log settings</primary>
+    <secondary>configuration in repmgr.conf</secondary>
+  </indexterm>
+  <title>Log settings</title>
+
+  <para>
+    By default, &repmgr; and <application>repmgrd</application> write log output to
+    <literal>STDERR</literal>. An alternative log destination can be specified
+    (either a file or <literal>syslog</literal>).
+  </para>
+
+  <note>
+    <para>
+      The &repmgr; application itself will continue to write log output to <literal>STDERR</literal>
+      even if another log destination is configured, as otherwise any output resulting from a command
+      line operation will "disappear" into the log.
+    </para>
+    <para>
+      This behaviour can be overriden with the command line option <option>--log-to-file</option>,
+      which will redirect all logging output to the configured log destination. This is recommended
+      when &repmgr; is executed by another application, particularly <application>repmgrd</application>,
+      to enable log output generated by the &repmgr; application to be stored for later reference.
+    </para>
+  </note>
+
+  <variablelist>
+
+   <varlistentry id="repmgr-conf-log-level" xreflabel="log_level">
+    <term><varname>log_level</varname> (<type>string</type>)
+     <indexterm>
+      <primary><varname>log_level</varname> configuration file parameter</primary>
+     </indexterm>
+    </term>
+    <listitem>
+     <para>
+       One of <option>DEBUG</option>, <option>INFO</option>, <option>NOTICE</option>,
+       <option>WARNING</option>, <option>ERROR</option>, <option>ALERT</option>, <option>CRIT</option>
+       or <option>EMERG</option>.
+     </para>
+     <para>
+       Default is <option>INFO</option>.
+     </para>
+     <para>
+       Note that <option>DEBUG</option> will produce a substantial amount of log output
+       and should not be enabled in normal use.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry id="repmgr-conf-log-facility" xreflabel="log_facility">
+    <term><varname>log_facility</varname> (<type>string</type>)
+     <indexterm>
+      <primary><varname>log_facility</varname> configuration file parameter</primary>
+     </indexterm>
+    </term>
+    <listitem>
+     <para>
+       Logging facility: possible values are <option>STDERR</option> (default), or for
+       syslog integration, one of <option>LOCAL0</option>, <option>LOCAL1</option>, <option>...</option>,
+       <option>LOCAL7</option>, <option>USER</option>.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry id="repmgr-conf-log-file" xreflabel="log_file">
+    <term><varname>log_file</varname> (<type>string</type>)
+     <indexterm>
+      <primary><varname>log_file</varname> configuration file parameter</primary>
+     </indexterm>
+    </term>
+    <listitem>
+     <para>
+       If <xref linkend="repmgr-conf-log-facility"> is set to <option>STDERR</option>, log output
+       can be redirected to the specified file.
+     </para>
+     <para>
+       See <xref linkend="repmgrd-log-rotation"> for information on configuring log rotation.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry id="repmgr-conf-log-status-interval" xreflabel="log_status_interval">
+    <term><varname>log_status_interval</varname> (<type>integer</type>)
+     <indexterm>
+      <primary><varname>log_status_interval</varname> configuration file parameter</primary>
+     </indexterm>
+    </term>
+    <listitem>
+     <para>
+       This setting causes <application>repmgrd</application> to emit a status log
+       line at the specified interval (in seconds, default <literal>300</literal>)
+       describing <application>repmgrd</application>'s current state, e.g.:
+     </para>
+     <programlisting>
+      [2018-07-12 00:47:32] [INFO] monitoring connection to upstream node "node1" (node ID: 1)</programlisting>
+    </listitem>
+   </varlistentry>
+
+  </variablelist>
+
+</sect1>

doc/configuration-file-required-settings.sgml

@@ -1,10 +1,10 @@
-<sect1 id="configuration-file-settings" xreflabel="configuration file settings">
+<sect1 id="configuration-file-settings" xreflabel="required configuration file settings">
   <indexterm>
     <primary>repmgr.conf</primary>
-    <secondary>settings</secondary>
+    <secondary>required settings</secondary>
   </indexterm>
 
- <title>Configuration file settings</title>
+ <title>Required configuration file settings</title>
  <para>
    Each <filename>repmgr.conf</filename> file must contain the following parameters:
  </para>
@@ -92,7 +92,10 @@
 
   <para>
     For a full list of annotated configuration items, see the file
-    <ulink url="https://raw.githubusercontent.com/2ndQuadrant/repmgr/master/repmgr.conf.sample">repmgr.conf.sample</>.
+    <ulink url="https://raw.githubusercontent.com/2ndQuadrant/repmgr/master/repmgr.conf.sample">repmgr.conf.sample</ulink>.
+  </para>
+  <para>
+    For <application>repmgrd</application>-specific settings, see <xref linkend="repmgrd-configuration">.
   </para>
 
   <note>

doc/configuration-file-service-commands.sgml

@@ -0,0 +1,130 @@
+<sect1 id="configuration-file-service-commands" xreflabel="service command settings">
+  <indexterm>
+    <primary>repmgr.conf</primary>
+    <secondary>service command settings</secondary>
+  </indexterm>
+  <indexterm>
+    <primary>service command settings</primary>
+    <secondary>configuration in repmgr.conf</secondary>
+  </indexterm>
+  <title>Service command settings</title>
+
+  <para>
+    In some circumstances, &repmgr; (and <application>repmgrd</application>) need to
+    be able to stop, start or restart PostgreSQL. &repmgr; commands which need to do this
+    include <link linkend="repmgr-standby-follow"><command>repmgr standby follow</command></link>,
+    <link linkend="repmgr-standby-switchover"><command>repmgr standby switchover</command></link> and
+    <link linkend="repmgr-node-rejoin"><command>repmgr node rejoin</command></link>.
+  </para>
+  <para>
+    By default, &repmgr; will use PostgreSQL's <command>pg_ctl</command> utility to control the PostgreSQL
+    server. However this can lead to various problems, particularly when PostgreSQL has been
+    installed from packages, and especially so if <application>systemd</application> is in use.
+  </para>
+
+
+  <note>
+    <para>
+      If using <application>systemd</application>, ensure you have <varname>RemoveIPC</varname> set to <literal>off</literal>.
+      See the <ulink url="https://wiki.postgresql.org/wiki/Systemd">systemd</ulink>
+      entry in the <ulink url="https://wiki.postgresql.org/wiki/Main_Page">PostgreSQL wiki</ulink> for details.
+    </para>
+  </note>
+
+
+  <para>
+    With this in mind, we recommend to <emphasis>always</emphasis> configure &repmgr; to use the
+    available system service commands.
+  </para>
+
+  <para>
+    To do this, specify the appropriate command for each action
+    in <filename>repmgr.conf</filename> using the following configuration
+    parameters:
+    <programlisting>
+    service_start_command
+    service_stop_command
+    service_restart_command
+    service_reload_command</programlisting>
+  </para>
+
+  <note>
+    <para>
+      &repmgr; will not apply <option>pg_bindir</option> when executing any of these commands;
+      these can be user-defined scripts so must always be specified with the full path.
+    </para>
+  </note>
+
+  <note>
+    <para>
+      It's also possible to specify a <varname>service_promote_command</varname>.
+      This is intended for systems which provide a package-level promote command,
+      such as Debian's <application>pg_ctlcluster</application>, to promote the
+      PostgreSQL from standby to primary.
+    </para>
+    <para>
+      If your packaging system does not provide such a command, it can be left empty,
+      and &repmgr; will generate the appropriate `pg_ctl ... promote` command.
+    </para>
+    <para>
+      Do not confuse this with <varname>promote_command</varname>, which is used
+      by <application>repmgrd</application> to execute <xref linkend="repmgr-standby-promote">.
+    </para>
+  </note>
+
+  <para>
+    To confirm which command &repmgr; will execute for each action, use
+    <command>repmgr node service --list --action=...</command>, e.g.:
+    <programlisting>
+      repmgr -f /etc/repmgr.conf node service --list --action=stop
+      repmgr -f /etc/repmgr.conf node service --list --action=start
+      repmgr -f /etc/repmgr.conf node service --list --action=restart
+      repmgr -f /etc/repmgr.conf node service --list --action=reload</programlisting>
+  </para>
+
+  <para>
+     These commands will be executed by the system user which &repmgr; runs as (usually <literal>postgres</literal>)
+     and will probably require passwordless sudo access to be able to execute the command.
+  </para>
+  <para>
+    For example, using <application>systemd</application> on CentOS 7, the service commands can be
+    set as follows:
+    <programlisting>
+      service_start_command   = 'sudo systemctl start postgresql-9.6'
+      service_stop_command    = 'sudo systemctl stop postgresql-9.6'
+      service_restart_command = 'sudo systemctl restart postgresql-9.6'
+      service_reload_command  = 'sudo systemctl reload postgresql-9.6'</programlisting>
+    and <filename>/etc/sudoers</filename> should be set as follows:
+    <programlisting>
+      Defaults:postgres !requiretty
+      postgres ALL = NOPASSWD: /usr/bin/systemctl stop postgresql-9.6, \
+        /usr/bin/systemctl start postgresql-9.6, \
+        /usr/bin/systemctl restart postgresql-9.6, \
+        /usr/bin/systemctl reload postgresql-9.6</programlisting>
+  </para>
+
+  <important>
+    <indexterm>
+      <primary>pg_ctlcluster</primary>
+      <secondary>service command settings</secondary>
+    </indexterm>
+    <para>
+      Debian/Ubuntu users: instead of calling <command>sudo systemctl</command> directly, use
+      <command>sudo pg_ctlcluster</command>, e.g.:
+    <programlisting>
+      service_start_command   = 'sudo pg_ctlcluster 9.6 main start'
+      service_stop_command    = 'sudo pg_ctlcluster 9.6 main stop'
+      service_restart_command = 'sudo pg_ctlcluster 9.6 main restart'
+      service_reload_command  = 'sudo pg_ctlcluster 9.6 main reload'</programlisting>
+      and set <filename>/etc/sudoers</filename> accordingly.
+    </para>
+    <para>
+      While <command>pg_ctlcluster</command> will work when executed as user <literal>postgres</literal>,
+      it's strongly recommended to use <command>sudo pg_ctlcluster</command> on <application>systemd</application>
+      systems, to ensure <application>systemd</application> has a correct picture of
+      the PostgreSQL application state.
+    </para>
+
+  </important>
+
+</sect1>

doc/configuration.sgml

@@ -2,15 +2,17 @@
   <title>repmgr configuration</title>
 
   &configuration-file;
-  &configuration-file-settings;
+  &configuration-file-required-settings;
+  &configuration-file-log-settings;
+  &configuration-file-service-commands;
 
-  <sect1 id="configuration-permissions" xreflabel="User permissions">
+  <sect1 id="configuration-permissions" xreflabel="Database user permissions">
     <indexterm>
       <primary>configuration</primary>
-      <secondary>user permissions</secondary>
+      <secondary>database user permissions</secondary>
     </indexterm>
 
-    <title>repmgr user permissions</title>
+    <title>repmgr database user permissions</title>
     <para>
       &repmgr; will create an extension database containing objects
       for administering &repmgr; metadata. The user defined in the <varname>conninfo</varname>

doc/configuring-witness-server.sgml

@@ -16,15 +16,22 @@
  <para>
    A typical use case for a witness server is a two-node streaming replication
    setup, where the primary and standby are in different locations (data centres).
-   By creating a witness server in the same location as the primary, if the primary
-   becomes unavailable  it's possible for the standby to decide whether it can
-   promote itself without risking a "split brain" scenario: if it can't see either the
+   By creating a witness server in the same location (data centre) as the primary,
+   if the primary becomes unavailable it's possible for the standby to decide whether
+   it can promote itself without risking a "split brain" scenario: if it can't see either the
    witness or the primary server, it's likely there's a network-level interruption
    and it should not promote itself. If it can seen the witness but not the primary,
    this proves there is no network interruption and the primary itself is unavailable,
    and it can therefore promote itself (and ideally take action to fence the
    former primary).
  </para>
+ <note>
+   <para>
+     <emphasis>Never</emphasis> install a witness server on the same physical host
+     as another node in the replication cluster managed by &repmgr; - it's essential
+     the witness is not affected in any way by failure of another node.
+   </para>
+ </note>
  <para>
    For more complex replication scenarios,e.g. with multiple datacentres, it may
    be preferable to use location-based failover, which ensures that only nodes

doc/event-notifications.sgml

@@ -147,34 +147,104 @@
  <para>
   By default, all notification types will be passed to the designated script;
   the notification types can be filtered to explicitly named ones using the
-  <varname>event_notifications</varname> parameter:
+  <varname>event_notifications</varname> parameter.
+ </para>
+
+ <para>
+   Events generated by the &repmgr; command:
 
   <itemizedlist spacing="compact" mark="bullet">
 
    <listitem>
-    <simpara><literal>primary_register</literal></simpara>
+     <simpara><literal><link linkend="repmgr-primary-register-events">cluster_created</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>primary_unregister</literal></simpara>
+     <simpara><literal><link linkend="repmgr-primary-register-events">primary_register</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>standby_register</literal></simpara>
+     <simpara><literal><link linkend="repmgr-primary-unregister-events">primary_unregister</link></literal></simpara>
+   </listitem>
+
+   <listitem>
+    <simpara><literal><link linkend="repmgr-standby-clone-events">standby_clone</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>standby_register_sync</literal></simpara>
+    <simpara><literal><link linkend="repmgr-standby-register-events">standby_register</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>standby_unregister</literal></simpara>
+    <simpara><literal><link linkend="repmgr-standby-register-events">standby_register_sync</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>standby_clone</literal></simpara>
+    <simpara><literal><link linkend="repmgr-standby-unregister-events">standby_unregister</link></literal></simpara>
+   </listitem>
+
+   <listitem>
+    <simpara><literal><link linkend="repmgr-standby-promote-events">standby_promote</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>standby_promote</literal></simpara>
+    <simpara><literal><link linkend="repmgr-standby-follow-events">standby_follow</link></literal></simpara>
    </listitem>
    <listitem>
-    <simpara><literal>standby_follow</literal></simpara>
+     <simpara><literal><link linkend="repmgr-standby-switchover-events">standby_switchover</link></literal></simpara>
    </listitem>
+
+   <listitem>
+     <simpara><literal><link linkend="repmgr-witness-register-events">witness_register</link></literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal><link linkend="repmgr-witness-unregister-events">witness_unregister</link></literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal><link linkend="repmgr-node-rejoin-events">node_rejoin</link></literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal><link linkend="repmgr-cluster-cleanup-events">cluster_cleanup</link></literal></simpara>
+   </listitem>
+
+  </itemizedlist>
+ </para>
+
+ <para>
+   Events generated by <application>repmgrd</application> (streaming replication mode):
+
+   <itemizedlist spacing="compact" mark="bullet">
+   <listitem>
+    <simpara><literal>repmgrd_start</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_shutdown</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_reload</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_failover_promote</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_failover_follow</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_failover_aborted</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_standby_reconnect</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_promote_error</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_local_disconnect</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_local_reconnect</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_upstream_disconnect</literal></simpara>
+   </listitem>
+   <listitem>
+    <simpara><literal>repmgrd_upstream_reconnect</literal></simpara>
+   </listitem>
+
    <listitem>
     <simpara><literal>standby_disconnect_manual</literal></simpara>
    </listitem>
@@ -184,39 +254,13 @@
    <listitem>
     <simpara><literal>standby_recovery</literal></simpara>
    </listitem>
-   <listitem>
-    <simpara><literal>witness_register</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>witness_unregister</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>node_rejoin</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_start</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_shutdown</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_failover_promote</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_failover_follow</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_upstream_disconnect</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_upstream_reconnect</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_promote_error</literal></simpara>
-   </listitem>
-   <listitem>
-    <simpara><literal>repmgrd_failover_promote</literal></simpara>
-   </listitem>
+
+   </itemizedlist>
+ </para>
+
+  <para>
+   Events generated by <application>repmgrd</application> (BDR mode):
+   <itemizedlist spacing="compact" mark="bullet">
    <listitem>
     <simpara><literal>bdr_failover</literal></simpara>
    </listitem>

doc/filelist.sgml

@@ -38,7 +38,9 @@
 <!ENTITY quickstart      SYSTEM "quickstart.sgml">
 <!ENTITY configuration      SYSTEM "configuration.sgml">
 <!ENTITY configuration-file      SYSTEM "configuration-file.sgml">
-<!ENTITY configuration-file-settings      SYSTEM "configuration-file-settings.sgml">
+<!ENTITY configuration-file-required-settings      SYSTEM "configuration-file-required-settings.sgml">
+<!ENTITY configuration-file-log-settings      SYSTEM "configuration-file-log-settings.sgml">
+<!ENTITY configuration-file-service-commands   SYSTEM "configuration-file-service-commands.sgml">
 <!ENTITY cloning-standbys  SYSTEM "cloning-standbys.sgml">
 <!ENTITY promoting-standby  SYSTEM "promoting-standby.sgml">
 <!ENTITY follow-new-primary  SYSTEM "follow-new-primary.sgml">
@@ -56,6 +58,7 @@
 <!ENTITY repmgrd-cascading-replication SYSTEM "repmgrd-cascading-replication.sgml">
 <!ENTITY repmgrd-network-split SYSTEM "repmgrd-network-split.sgml">
 <!ENTITY repmgrd-witness-server SYSTEM "repmgrd-witness-server.sgml">
+<!ENTITY repmgrd-pausing SYSTEM "repmgrd-pausing.sgml">
 <!ENTITY repmgrd-bdr SYSTEM "repmgrd-bdr.sgml">
 
 <!ENTITY repmgr-primary-register SYSTEM "repmgr-primary-register.sgml">
@@ -76,6 +79,9 @@
 <!ENTITY repmgr-cluster-crosscheck SYSTEM "repmgr-cluster-crosscheck.sgml">
 <!ENTITY repmgr-cluster-event SYSTEM "repmgr-cluster-event.sgml">
 <!ENTITY repmgr-cluster-cleanup SYSTEM "repmgr-cluster-cleanup.sgml">
+<!ENTITY repmgr-daemon-status SYSTEM "repmgr-daemon-status.sgml">
+<!ENTITY repmgr-daemon-pause SYSTEM "repmgr-daemon-pause.sgml">
+<!ENTITY repmgr-daemon-unpause SYSTEM "repmgr-daemon-unpause.sgml">
 
 <!ENTITY appendix-release-notes  SYSTEM "appendix-release-notes.sgml">
 <!ENTITY appendix-faq      SYSTEM "appendix-faq.sgml">

doc/install-packages.sgml

@@ -5,83 +5,95 @@
   system.
  </para>
 
- <sect2 id="installation-packages-redhat" xreflabel="Installing from packages on RHEL, Fedora and CentOS">
+ <sect2 id="installation-packages-redhat" xreflabel="Installing from packages on RHEL, CentOS and Fedora">
 
   <indexterm>
    <primary>installation</primary>
-   <secondary>on Redhat/CentOS/Fedora etc.</secondary>
+   <secondary>on Red Hat/CentOS/Fedora etc.</secondary>
   </indexterm>
 
-  <title>RedHat/Fedora/CentOS</title>
+  <title>RedHat/CentOS/Fedora</title>
   <para>
-   RPM packages for &repmgr; are available via Yum through
+	&repmgr; RPM packages for RedHat/CentOS variants and Fedora are available from the
+	<ulink url="https://2ndquadrant.com">2ndQuadrant</ulink>
+	<ulink url="https://dl.2ndquadrant.com/">public repository</ulink>; see following
+	section for details.
+  </para>
+  <para>
+   RPM packages for &repmgr; are also available via Yum through
    the PostgreSQL Global Development Group RPM repository
    (<ulink url="https://yum.postgresql.org/">http://yum.postgresql.org/</ulink>).
    Follow the instructions for your distribution (RedHat, CentOS,
-   Fedora, etc.) and architecture as detailed there.
+   Fedora, etc.) and architecture as detailed there. Note that it can take some days
+   for new &repmgr; packages to become available via the this repository.
   </para>
+  <note>
+    <para>
+      &repmgr; packages are designed to be compatible with the community-provided PostgreSQL packages.
+      They may not work with vendor-specific packages such as those provided by RedHat for RHEL
+      customers, as the filesystem layout may be different to the community RPMs.
+      Please contact your support vendor for assistance.
+    </para>
+  </note>
+
   <para>
-   <ulink url="https://2ndquadrant.com">2ndQuadrant</ulink> also provides its
-   own RPM packages which are made available
-   at the same time as each &repmgr; release, as it can take some days for
-   them to become available via the main PGDG repository. See following section for details:
+    For more information on the package contents, including details of installation
+    paths and relevant <link linkend="configuration-file-service-commands">service commands</link>,
+    see the appendix section <xref linkend="packages-centos">.
   </para>
 
 
   <sect3 id="installation-packages-redhat-2ndq">
-    <title>2ndQuadrant repmgr yum repository</title>
+    <title>2ndQuadrant public RPM yum repository</title>
+
     <para>
-      Beginning with <ulink url="http://repmgr.org/release-notes-3.1.3.html">repmgr 3.1.3</ulink>,
+      Beginning with <ulink url="https://repmgr.org/docs/4.1/release-4.0.5.html">repmgr 4.0.5</ulink>,
       <ulink url="https://2ndquadrant.com/">2ndQuadrant</ulink> provides a dedicated <literal>yum</literal>
-      repository for &repmgr; releases. This repository complements the main
-      <ulink url="https://yum.postgresql.org/repopackages.php">PGDG community repository</ulink>,
-      but enables repmgr users to access the latest &repmgr; packages before they are
-      available via the PGDG repository, which can take several days to be updated following
-      a fresh  &repmgr; release.
-    </para>
+	  <ulink url="https://dl.2ndquadrant.com/">public repository</ulink> for 2ndQuadrant software,
+	  including &repmgr;. We recommend using this for all future &repmgr; releases.
+	</para>
+	<para>
+	  General instructions for using this repository can be found on its
+	  <ulink url="https://dl.2ndquadrant.com/">homepage</ulink>. Specific instructions
+	  for installing &repmgr; follow below.
+	</para>
     <para>
       <emphasis>Installation</emphasis>
 
       <itemizedlist>
-        <listitem>
-          <para>
-            Import the repository public key (optional but recommended):
-            <programlisting>
-              rpm --import http://packages.2ndquadrant.com/repmgr/RPM-GPG-KEY-repmgr</programlisting>
-          </para>
-        </listitem>
+		<listitem>
+		  <para>
+			Locate the repository RPM for your PostgreSQL version from the list at:
+			<ulink url="https://dl.2ndquadrant.com/">https://dl.2ndquadrant.com/</ulink>
+		  </para>
+		</listitem>
 
         <listitem>
           <para>
-            Install the repository RPM for your distribution (this enables the 2ndQuadrant
-            repository as a source of repmgr packages):
-            <itemizedlist>
-              <listitem>
-                <simpara>
-                  <emphasis>Fedora:</emphasis>
-                  <ulink url="http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-fedora-1.0-1.noarch.rpm">http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-fedora-1.0-1.noarch.rpm</ulink>
-                </simpara>
-              </listitem>
-              <listitem>
-                <simpara>
-                  <emphasis>RHEL, CentOS etc:</emphasis>
-                  <ulink url="http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-rhel-1.0-1.noarch.rpm">http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-rhel-1.0-1.noarch.rpm</ulink>
-                </simpara>
-              </listitem>
-            </itemizedlist>
-          </para>
-          <para>
-            e.g.:
-            <programlisting>
-              $ yum install http://packages.2ndquadrant.com/repmgr/yum-repo-rpms/repmgr-rhel-1.0-1.noarch.rpm</programlisting>
-          </para>
-        </listitem>
+            Install the repository definition for your distribution and PostgreSQL version
+			(this enables the 2ndQuadrant repository as a source of &repmgr; packages).
+		  </para>
+		  <para>
+			For example, for PostgreSQL 10 on CentOS, execute:
+			<programlisting>
+curl https://dl.2ndquadrant.com/default/release/get/10/rpm | sudo bash</programlisting>
+		  </para>
+		  <para>
+			Verify that the repository is installed with:
+			<programlisting>
+sudo yum repolist</programlisting>
+			The output should contain two entries like this:
+			<programlisting>
+2ndquadrant-dl-default-release-pg10/7/x86_64        2ndQuadrant packages (PG10) for 7 - x86_64          4
+2ndquadrant-dl-default-release-pg10-debug/7/x86_64  2ndQuadrant packages (PG10) for 7 - x86_64 - Debug  3</programlisting>
+		  </para>
+		</listitem>
 
         <listitem>
           <para>
-            Install the repmgr version appropriate for your PostgreSQL version (e.g. <literal>repmgr96</literal>), e.g.:
+            Install the &repmgr version appropriate for your PostgreSQL version (e.g. <literal>repmgr10</literal>):
             <programlisting>
-              $ yum install repmgr96</programlisting>
+$ yum install repmgr10</programlisting>
           </para>
         </listitem>
       </itemizedlist>
@@ -91,13 +103,13 @@
       <emphasis>Compatibility with PGDG Repositories</emphasis>
     </para>
     <para>
-        The 2ndQuadrant &repmgr; yum repository uses exactly the same package definitions as the
-        main PGDG repository and is effectively a selective mirror for &repmgr; packages only.
+      The 2ndQuadrant &repmgr; yum repository packages use the same definitions and file system layout as the
+      main PGDG repository.
     </para>
     <para>
-        Normally yum should prioritize the repository with the most recent &repmgr; version.
-        Once the PGDG repository has been updated, it doesn't matter which repository
-        the packages are installed from.
+      Normally <application>yum</application> will prioritize the repository with the most recent &repmgr; version.
+      Once the PGDG repository has been updated, it doesn't matter which repository
+      the packages are installed from.
     </para>
     <para>
       To ensure the 2ndQuadrant repository is always prioritised, install <literal>yum-plugin-priorities</literal>
@@ -111,30 +123,23 @@
       To install a specific package version, execute <command>yum --showduplicates list</command>
       for the package in question:
       <programlisting>
-        [root@localhost ~]# yum --showduplicates list repmgr96
+        [root@localhost ~]# yum --showduplicates list repmgr10
         Loaded plugins: fastestmirror
         Loading mirror speeds from cached hostfile
          * base: ftp.iij.ad.jp
          * extras: ftp.iij.ad.jp
          * updates: ftp.iij.ad.jp
         Available Packages
-        repmgr96.x86_64               3.2-1.el6                    2ndquadrant-repmgr
-        repmgr96.x86_64               3.2.1-1.el6                  2ndquadrant-repmgr
-        repmgr96.x86_64               3.3-1.el6                    2ndquadrant-repmgr
-        repmgr96.x86_64               3.3.1-1.el6                  2ndquadrant-repmgr
-        repmgr96.x86_64               3.3.2-1.el6                  2ndquadrant-repmgr
-        repmgr96.x86_64               3.3.2-1.rhel6                pgdg96
-        repmgr96.x86_64               4.0.0-1.el6                  2ndquadrant-repmgr
-        repmgr96.x86_64               4.0.0-1.rhel6                pgdg96</programlisting>
+		repmgr10.x86_64                       4.0.3-1.rhel7                        pgdg10
+		repmgr10.x86_64                       4.0.4-1.rhel7                        pgdg10
+		repmgr10.x86_64                       4.0.5-1.el7                          2ndquadrant-repo-10</programlisting>
       then append the appropriate version number to the package name with a hyphen, e.g.:
       <programlisting>
-        [root@localhost ~]# yum install repmgr96-3.3.2-1.el6</programlisting>
+        [root@localhost ~]# yum install repmgr10-4.0.3-1.rhel7</programlisting>
     </para>
   </sect3>
  </sect2>
 
-
-
  <sect2 id="installation-packages-debian" xreflabel="Installing from packages on Debian or Ubuntu">
 
   <indexterm>
@@ -148,6 +153,76 @@
   Instructions can be found in the APT section of the PostgreSQL Wiki
   (<ulink url="https://wiki.postgresql.org/wiki/Apt">https://wiki.postgresql.org/wiki/Apt</ulink>).
   </para>
+  <para>
+    For more information on the package contents, including details of installation
+    paths and relevant <link linkend="configuration-file-service-commands">service commands</link>,
+    see the appendix section <xref linkend="packages-debian-ubuntu">.
+  </para>
+
+  <sect3 id="installation-packages-debian-ubuntu-2ndq">
+    <title>2ndQuadrant public apt repository for Debian/Ubuntu</title>
+
+    <para>
+      Beginning with <ulink url="https://repmgr.org/docs/4.0/release-4.0.5.html">repmgr 4.0.5</ulink>,
+      <ulink url="https://2ndquadrant.com/">2ndQuadrant</ulink> provides a
+	  <ulink url="https://dl.2ndquadrant.com/">public apt repository</ulink> for 2ndQuadrant software,
+	  including &repmgr;.
+	</para>
+	<para>
+	  General instructions for using this repository can be found on its
+	  <ulink url="https://dl.2ndquadrant.com/">homepage</ulink>. Specific instructions
+	  for installing &repmgr; follow below.
+	</para>
+
+    <para>
+
+      <emphasis>Installation</emphasis>
+
+      <itemizedlist>
+
+		<listitem>
+		  <para>
+            Install the repository definition for your distribution and PostgreSQL version
+			(this enables the 2ndQuadrant repository as a source of &repmgr; packages) by executing:
+            <programlisting>
+curl https://dl.2ndquadrant.com/default/release/get/deb | sudo bash</programlisting>
+		  </para>
+          <note>
+            <para>
+              This will automatically install the following additional packages, if not already present:
+              <itemizedlist spacing="compact" mark="bullet">
+                <listitem>
+                  <simpara><literal>lsb-release</literal></simpara>
+                </listitem>
+                <listitem>
+                  <simpara><literal>apt-transport-https</literal></simpara>
+                </listitem>
+              </itemizedlist>
+            </para>
+          </note>
+        </listitem>
+
+
+		<listitem>
+		  <para>
+            Install the &repmgr version appropriate for your PostgreSQL version (e.g. <literal>repmgr10</literal>):
+            <programlisting>
+$ apt-get install postgresql-10-repmgr</programlisting>
+		  </para>
+          <note>
+            <para>
+            For packages for PostgreSQL 9.6 and earlier, the package name includes
+            a period between major and minor version numbers, e.g.
+            <literal>postgresql-9.6-repmgr</literal>.
+            </para>
+          </note>
+		</listitem>
+
+	  </itemizedlist>
+
+	</para>
+
+  </sect3>
  </sect2>
 
 </sect1>

doc/install-requirements.sgml

@@ -36,7 +36,7 @@
   </para>
 
   <para>
-   A dedicated system user for &repmgr; is *not* required; as many &repmgr; and
+   A dedicated system user for &repmgr; is <emphasis>not</emphasis> required; as many &repmgr; and
    <application>repmgrd</application> actions require direct access to the PostgreSQL data directory,
    these commands should be executed by the <literal>postgres</literal> user.
   </para>
@@ -61,6 +61,13 @@
    </itemizedlist>
   </para>
 
+  <tip>
+    <simpara>
+      Consider setting <varname>ConnectTimeout</varname> to a low value in your SSH configuration.
+      This will make it faster to detect any SSH connection errors.
+    </simpara>
+  </tip>
+
   <tip>
    <simpara>
     We recommend using a session multiplexer utility such as <command>screen</command> or

doc/install-source.sgml

@@ -12,8 +12,8 @@
    To install &repmgr; the prerequisites for compiling
    &postgres; must be installed. These are described in &postgres;'s
    documentation
-   on <ulink url="https://www.postgresql.org/docs/current/install-requirements.html">build requirements</ulink>
-   and <ulink url="https://www.postgresql.org/docs/current/docguide-toolsets.html">build requirements for documentation</ulink>.
+   on <ulink url="https://www.postgresql.org/docs/current/static/install-requirements.html">build requirements</ulink>
+   and <ulink url="https://www.postgresql.org/docs/current/static/docguide-toolsets.html">build requirements for documentation</ulink>.
   </para>
 
   <para>
@@ -80,7 +80,7 @@
    </para>
 
    <para>
-    There are also tags for each &repmgr; release, e.g. <filename>REL4_0_STABLE</filename>.
+    There are also tags for each &repmgr; release, e.g. <filename>4.0.5</filename>.
    </para>
 
    <para>

doc/overview.sgml

@@ -2,7 +2,8 @@
  <title>repmgr overview</title>
 
  <para>
-  This chapter provides a high-level overview of repmgr's components and functionality.
+  This chapter provides a high-level overview of &repmgr;'s components and
+  functionality.
  </para>
  <sect1 id="repmgr-concepts" xreflabel="Concepts">
 

doc/quickstart.sgml

@@ -234,17 +234,45 @@
   <para>
    <filename>repmgr.conf</filename> should not be stored inside the PostgreSQL data directory,
    as it could be overwritten when setting up or reinitialising the PostgreSQL
-   server. See sections on <xref linkend="configuration-file"> and <xref linkend="configuration-file-settings">
+   server. See sections <xref linkend="configuration"> and <xref linkend="configuration-file">
    for further details about <filename>repmgr.conf</filename>.
   </para>
+
+  <note>
+    <para>
+      &repmgr; only uses <option>pg_bindir</option> when it executes
+      PostgreSQL binaries directly.
+    </para>
+    <para>
+      For user-defined scripts such as <option>promote_command</option> and the
+      various <option>service_*_command</option>s, you <emphasis>must</emphasis>
+      always explicitly provide the full path to the binary or script being
+      executed, even if it is &repmgr; itself.
+    </para>
+    <para>
+      This is because these options can contain user-defined scripts in arbitrary
+      locations, so prepending <option>pg_bindir</option> may break them.
+    </para>
+  </note>
+
   <tip>
    <simpara>
     For Debian-based distributions we recommend explictly setting
-    <literal>pg_bindir</literal> to the directory where <command>pg_ctl</command> and other binaries
+    <option>pg_bindir</option> to the directory where <command>pg_ctl</command> and other binaries
     not in the standard path are located. For PostgreSQL 9.6 this would be <filename>/usr/lib/postgresql/9.6/bin/</filename>.
    </simpara>
   </tip>
 
+  <tip>
+    <simpara>
+      If your distribution places the &repmgr; binaries in a location other than the
+      PostgreSQL installation directory, specify this with <option>repmgr_bindir</option>
+      to enable &repmgr; to perform operations (e.g.
+      <command><link linkend="repmgr-cluster-crosscheck">repmgr cluster crosscheck</link></command>)
+      on other nodes.
+    </simpara>
+  </tip>
+
   <para>
    See the file
    <ulink url="https://raw.githubusercontent.com/2ndQuadrant/repmgr/master/repmgr.conf.sample">repmgr.conf.sample</>

doc/repmgr-cluster-cleanup.sgml

@@ -15,9 +15,14 @@
     <title>Description</title>
     <para>
       Purges monitoring history from the <literal>repmgr.monitoring_history</literal> table to
-      prevent excessive table growth. Use the <literal>-k/--keep-history</literal> to specify the
-      number of days of monitoring history to retain. This command can be used
-      manually or as a cronjob.
+      prevent excessive table growth.
+    </para>
+    <para>
+      By default <emphasis>all</emphasis> data will be removed; Use the <option>-k/--keep-history</option>
+      option to specify the number of days of monitoring history to retain.
+    </para>
+    <para>
+      This command can be executed manually or as a cronjob.
     </para>
   </refsect1>
 
@@ -38,4 +43,35 @@
       <filename>repmgr.conf</filename>.
     </para>
   </refsect1>
+
+  <refsect1 id="repmgr-cluster-cleanup-events">
+    <title>Event notifications</title>
+    <para>
+      A <literal>cluster_cleanup</literal> <link linkend="event-notifications">event notification</link> will be generated.
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>--node-id</option></term>
+        <listitem>
+          <para>
+            Only delete monitoring records for the specified node.
+          </para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>See also</title>
+    <para>
+      For more details see the sections <xref linkend="repmgrd-monitoring"> and
+      <xref linkend="repmgrd-monitoring-configuration">.
+    </para>
+  </refsect1>
+
 </refentry>

doc/repmgr-cluster-crosscheck.sgml

@@ -38,5 +38,59 @@
       and therefore determine the state of outbound connections from that node.
     </para>
   </refsect1>
+
+  <refsect1>
+    <title>Exit codes</title>
+    <para>
+      Following exit codes can be emitted by <command>repmgr cluster crosscheck</command>:
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            The check completed successfully and all nodes are reachable.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_BAD_SSH (12)</option></term>
+        <listitem>
+          <para>
+            One or more nodes could not be accessed via SSH.
+          </para>
+          <note>
+            <simpara>
+              This only applies to nodes unreachable from the node where
+              this command is executed.
+            </simpara>
+            <simpara>
+              It's also possible that the crosscheck establishes that
+              connections between PostgreSQL on all nodes are functioning,
+              even if SSH access between some nodes is not possible.
+            </simpara>
+          </note>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_NODE_STATUS (25)</option></term>
+        <listitem>
+          <para>
+            PostgreSQL on one or more nodes could not be reached.
+          </para>
+          <note>
+            <simpara>
+              This error code overrides <option>ERR_BAD_SSH</option>.
+            </simpara>
+          </note>
+        </listitem>
+      </varlistentry>
+
+   </variablelist>
+  </refsect1>
+
 </refentry>
 

doc/repmgr-cluster-event.sgml

@@ -49,6 +49,22 @@
     </para>
   </refsect1>
 
+  <refsect1>
+    <title>Output format</title>
+    <para>
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <literal>--csv</literal>: generate output in CSV format. Note that the <literal>Details</literal>
+            column will currently not be emitted in CSV format.
+          </simpara>
+        </listitem>
+
+      </itemizedlist>
+    </para>
+  </refsect1>
+
   <refsect1>
     <title>Example</title>
     <para>

doc/repmgr-cluster-matrix.sgml

@@ -97,5 +97,49 @@
     useful result.
   </para>
   </refsect1>
+
+
+  <refsect1>
+    <title>Exit codes</title>
+    <para>
+      Following exit codes can be emitted by <command>repmgr cluster matrix</command>:
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            The check completed successfully and all nodes are reachable.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_BAD_SSH (12)</option></term>
+        <listitem>
+          <para>
+            One or more nodes could not be accessed via SSH.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_NODE_STATUS (25)</option></term>
+        <listitem>
+          <para>
+            PostgreSQL on one or more nodes could not be reached.
+          </para>
+          <note>
+            <simpara>
+              This error code overrides <option>ERR_BAD_SSH</option>.
+            </simpara>
+          </note>
+        </listitem>
+      </varlistentry>
+
+   </variablelist>
+  </refsect1>
+
 </refentry>
 

doc/repmgr-cluster-show.sgml

@@ -81,35 +81,91 @@
 
   <refsect1>
     <title>Options</title>
-    <para>
-      <command>repmgr cluster show</command> accepts an optional parameter <literal>--csv</literal>, which
-      outputs the replication cluster's status in a simple CSV format, suitable for
-      parsing by scripts:
-      <programlisting>
+
+    <variablelist>
+
+      <varlistentry>
+        <term><option>--csv</option></term>
+        <listitem>
+		  <para>
+			<command>repmgr cluster show</command> accepts an optional parameter <literal>--csv</literal>, which
+			outputs the replication cluster's status in a simple CSV format, suitable for
+			parsing by scripts, e.g.:
+			<programlisting>
     $ repmgr -f /etc/repmgr.conf cluster show --csv
     1,-1,-1
     2,0,0
     3,0,1</programlisting>
-    </para>
-    <para>
-      The columns have following meanings:
-      <itemizedlist spacing="compact" mark="bullet">
-        <listitem>
-          <simpara>
-            node ID
-          </simpara>
-        </listitem>
-        <listitem>
-          <simpara>
+		  </para>
+		  <para>
+			The columns have following meanings:
+			<itemizedlist spacing="compact" mark="bullet">
+			  <listitem>
+				<simpara>
+				  node ID
+				</simpara>
+			  </listitem>
+			  <listitem>
+				<simpara>
             availability (0 = available, -1 = unavailable)
-          </simpara>
-        </listitem>
+				</simpara>
+			  </listitem>
+			  <listitem>
+				<simpara>
+				  recovery state (0 = not in recovery, 1 = in recovery, -1 = unknown)
+				</simpara>
+			  </listitem>
+			</itemizedlist>
+		  </para>
+		</listitem>
+	  </varlistentry>
+
+      <varlistentry>
+        <term><option>--verbose</option></term>
         <listitem>
-          <simpara>
-            recovery state (0 = not in recovery, 1 = in recovery, -1 = unknown)
-          </simpara>
+          <para>
+			Display the full text of any database connection error messages
+          </para>
         </listitem>
-      </itemizedlist>
+      </varlistentry>
+
+	</variablelist>
+
+  </refsect1>
+
+
+  <refsect1>
+    <title>Exit codes</title>
+    <para>
+      Following exit codes can be emitted by <command>repmgr cluster show</command>:
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            No issues were detected.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_NODE_STATUS (25)</option></term>
+        <listitem>
+          <para>
+            One or more issues were detected.
+          </para>
+        </listitem>
+      </varlistentry>
+
+   </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>See also</title>
+    <para>
+     <xref linkend="repmgr-node-status">, <xref linkend="repmgr-node-check">, <xref linkend="repmgr-daemon-status">
     </para>
   </refsect1>
 

doc/repmgr-daemon-pause.sgml

@@ -0,0 +1,109 @@
+<refentry id="repmgr-daemon-pause">
+  <indexterm>
+    <primary>repmgr daemon pause</primary>
+  </indexterm>
+
+  <refmeta>
+    <refentrytitle>repmgr daemon pause</refentrytitle>
+  </refmeta>
+
+  <refnamediv>
+    <refname>repmgr daemon pause</refname>
+    <refpurpose>Instruct all <application>repmgrd</application> instances in the replication cluster to pause failover operations</refpurpose>
+  </refnamediv>
+
+  <refsect1>
+    <title>Description</title>
+    <para>
+      This command can be run on any active node in the replication cluster to instruct all
+      running <application>repmgrd</application> instances to &quot;pause&quot; themselves, i.e. take no
+      action (such as promoting themselves or following a new primary) if a failover event is detected.
+    </para>
+    <para>
+      This functionality is useful for performing maintenance operations, such as switchovers
+      or upgrades, which might otherwise trigger a failover if <application>repmgrd</application>
+      is running normally.
+    </para>
+    <note>
+      <para>
+        It's important to wait a few seconds after restarting PostgreSQL on any node before running
+        <command>repmgr daemon pause</command>, as the <application>repmgrd</application> instance
+        on the restarted node will take a second or two before it has updated its status.
+      </para>
+    </note>
+    <para>
+      <xref linkend="repmgr-daemon-unpause"> will instruct all previously paused <application>repmgrd</application>
+      instances to resume normal failover operation.
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Execution</title>
+    <para>
+      <command>repmgr daemon pause</command> can be executed on any active node in the
+      replication cluster. A valid <filename>repmgr.conf</filename> file is required.
+      It will have no effect on previously paused nodes.
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Example</title>
+    <para>
+    <programlisting>
+$ repmgr -f /etc/repmgr.conf daemon pause
+NOTICE: node 1 (node1) paused
+NOTICE: node 2 (node2) paused
+NOTICE: node 3 (node3) paused</programlisting>
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+    <variablelist>
+      <varlistentry>
+        <term><option>--dry-run</option></term>
+        <listitem>
+          <para>
+            Check if nodes are reachable but don't pause <application>repmgrd</application>.
+          </para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Exit codes</title>
+    <para>
+      Following exit codes can be emitted by <command>repmgr daemon unpause</command>:
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            <application>repmgrd</application> could be paused on all nodes.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_REPMGRD_PAUSE (26)</option></term>
+        <listitem>
+          <para>
+           <application>repmgrd</application> could not be paused on one or mode nodes.
+          </para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>See also</title>
+    <para>
+      <xref linkend="repmgr-daemon-unpause">, <xref linkend="repmgr-daemon-status">
+    </para>
+  </refsect1>
+</refentry>
+

doc/repmgr-daemon-status.sgml

@@ -0,0 +1,165 @@
+<refentry id="repmgr-daemon-status">
+  <indexterm>
+    <primary>repmgr daemon status</primary>
+  </indexterm>
+
+  <refmeta>
+    <refentrytitle>repmgr daemon status</refentrytitle>
+  </refmeta>
+
+  <refnamediv>
+    <refname>repmgr daemon status</refname>
+    <refpurpose>display information about the status of <application>repmgrd</application> on each node in the cluster</refpurpose>
+  </refnamediv>
+
+  <refsect1>
+    <title>Description</title>
+    <para>
+      This command provides an overview over all active nodes in the cluster and the state
+      of each node's <application>repmgrd</application> instance. It can be used to check
+      the result of <xref linkend="repmgr-daemon-pause"> and <xref linkend="repmgr-daemon-unpause">
+      operations.
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Execution</title>
+    <para>
+      <command>repmgr daemon status</command> can be executed on any active node in the
+      replication cluster. A valid <filename>repmgr.conf</filename> file is required.
+    </para>
+
+    <note>
+      <para>
+        After restarting PostgreSQL on any node, the <application>repmgrd</application> instance
+        will take a second or two before it is able to update its status. Until then,
+        <application>repmgrd</application> will be shown as not running.
+      </para>
+    </note>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Examples</title>
+    <para>
+      <application>repmgrd</application> running normally on all nodes:
+    <programlisting>$ repmgr -f /etc/repmgr.conf daemon status
+ ID | Name  | Role    | Status  | repmgrd | PID  | Paused?
+----+-------+---------+---------+---------+------+---------
+ 1  | node1 | primary | running | running | 7851 | no
+ 2  | node2 | standby | running | running | 7889 | no
+ 3  | node3 | standby | running | running | 7918 | no</programlisting>
+    </para>
+
+    <para>
+      <application>repmgrd</application> paused on all nodes (using <xref linkend="repmgr-daemon-pause">):
+    <programlisting>$ repmgr -f /etc/repmgr.conf daemon status
+ ID | Name  | Role    | Status  | repmgrd | PID  | Paused?
+----+-------+---------+---------+---------+------+---------
+ 1  | node1 | primary | running | running | 7851 | yes
+ 2  | node2 | standby | running | running | 7889 | yes
+ 3  | node3 | standby | running | running | 7918 | yes</programlisting>
+    </para>
+
+    <para>
+      <application>repmgrd</application> not running on one node:
+    <programlisting>$ repmgr -f /etc/repmgr.conf daemon status
+ ID | Name  | Role    | Status  | repmgrd     | PID  | Paused?
+----+-------+---------+---------+-------------+------+---------
+ 1  | node1 | primary | running | running     | 7851 | yes
+ 2  | node2 | standby | running | not running | n/a  | n/a
+ 3  | node3 | standby | running | running     | 7918 | yes</programlisting>
+    </para>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+
+    <variablelist>
+
+      <varlistentry>
+        <term><option>--csv</option></term>
+        <listitem>
+		  <para>
+			<command>repmgr daemon status</command> accepts an optional parameter <literal>--csv</literal>, which
+			outputs the replication cluster's status in a simple CSV format, suitable for
+			parsing by scripts, e.g.:
+			<programlisting>
+    $ repmgr -f /etc/repmgr.conf daemon status --csv
+    1,node1,primary,1,1,10204,1
+    2,node2,standby,1,0,-1,1
+    3,node3,standby,1,1,10225,1</programlisting>
+		  </para>
+		  <para>
+			The columns have following meanings:
+			<itemizedlist spacing="compact" mark="bullet">
+			  <listitem>
+				<simpara>
+				  node ID
+				</simpara>
+			  </listitem>
+
+			  <listitem>
+				<simpara>
+                  node name
+				</simpara>
+			  </listitem>
+
+			  <listitem>
+				<simpara>
+                  node type (primary or standby)
+				</simpara>
+			  </listitem>
+
+			  <listitem>
+				<simpara>
+                  PostgreSQL server running
+				</simpara>
+			  </listitem>
+
+			  <listitem>
+				<simpara>
+                  <application>repmgrd</application> running (1 = running, 0 = not running)
+				</simpara>
+			  </listitem>
+
+			  <listitem>
+				<simpara>
+                  <application>repmgrd</application> PID (-1 if not running)
+				</simpara>
+			  </listitem>
+
+			  <listitem>
+				<simpara>
+                  <application>repmgrd</application> paused (1 = paused, 0 = not paused)
+				</simpara>
+			  </listitem>
+
+			</itemizedlist>
+		  </para>
+		</listitem>
+	  </varlistentry>
+
+      <varlistentry>
+        <term><option>--verbose</option></term>
+        <listitem>
+          <para>
+			Display the full text of any database connection error messages
+          </para>
+        </listitem>
+      </varlistentry>
+
+	</variablelist>
+
+  </refsect1>
+
+
+
+  <refsect1>
+    <title>See also</title>
+    <para>
+      <xref linkend="repmgr-daemon-pause">, <xref linkend="repmgr-daemon-unpause">, <xref linkend="repmgr-cluster-show">
+    </para>
+  </refsect1>
+</refentry>

doc/repmgr-daemon-unpause.sgml

@@ -0,0 +1,103 @@
+<refentry id="repmgr-daemon-unpause">
+  <indexterm>
+    <primary>repmgr daemon unpause</primary>
+  </indexterm>
+
+  <refmeta>
+    <refentrytitle>repmgr daemon unpause</refentrytitle>
+  </refmeta>
+
+  <refnamediv>
+    <refname>repmgr daemon unpause</refname>
+    <refpurpose>Instruct all <application>repmgrd</application> instances in the replication cluster to resume failover operations</refpurpose>
+  </refnamediv>
+
+  <refsect1>
+    <title>Description</title>
+    <para>
+      This command can be run on any active node in the replication cluster to instruct all
+      running <application>repmgrd</application> instances to &quot;unpause&quot;
+      (following a previous execution of <xref linkend="repmgr-daemon-pause">)
+      and resume normal failover/monitoring operation.
+    </para>
+
+    <note>
+      <para>
+        It's important to wait a few seconds after restarting PostgreSQL on any node before running
+        <command>repmgr daemon pause</command>, as the <application>repmgrd</application> instance
+        on the restarted node will take a second or two before it has updated its status.
+      </para>
+    </note>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Execution</title>
+    <para>
+     <command>repmgr daemon unpause</command> can be executed on any active node in the
+      replication cluster. A valid <filename>repmgr.conf</filename> file is required.
+      It will have no effect on nodes which are not already paused.
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Example</title>
+    <para>
+    <programlisting>
+$ repmgr -f /etc/repmgr.conf daemon unpause
+NOTICE: node 1 (node1) unpaused
+NOTICE: node 2 (node2) unpaused
+NOTICE: node 3 (node3) unpaused</programlisting>
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+    <variablelist>
+      <varlistentry>
+        <term><option>--dry-run</option></term>
+        <listitem>
+          <para>
+            Check if nodes are reachable but don't unpause <application>repmgrd</application>.
+          </para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Exit codes</title>
+    <para>
+      Following exit codes can be emitted by <command>repmgr daemon unpause</command>:
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            <application>repmgrd</application> could be unpaused on all nodes.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_REPMGRD_PAUSE (26)</option></term>
+        <listitem>
+          <para>
+           <application>repmgrd</application> could not be unpaused on one or mode nodes.
+          </para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>See also</title>
+    <para>
+      <xref linkend="repmgr-daemon-pause">, <xref linkend="repmgr-daemon-status">
+    </para>
+  </refsect1>
+</refentry>
+

doc/repmgr-node-check.sgml

@@ -30,7 +30,8 @@
             Replication lag: OK (N/A - node is primary)
             WAL archiving: OK (0 pending files)
             Downstream servers: OK (2 of 2 downstream nodes attached)
-            Replication slots: OK (node has no replication slots)</programlisting>
+            Replication slots: OK (node has no replication slots)
+            Missing replication slots: OK (node has no missing replication slots)</programlisting>
     </para>
   </refsect1>
   <refsect1>
@@ -61,7 +62,9 @@
 
      <listitem>
       <simpara>
-        <literal>--archive-ready</literal>: checks for WAL files which have not yet been archived
+        <literal>--archive-ready</literal>: checks for WAL files which have not yet been archived,
+        and returns <literal>WARNING</literal> or <literal>CRITICAL</literal> if the number
+        exceeds <varname>archive_ready_warning</varname> or <varname>archive_ready_critical</varname> respectively.
       </simpara>
      </listitem>
 
@@ -77,11 +80,110 @@
       </simpara>
      </listitem>
 
+     <listitem>
+      <simpara>
+        <literal>--missing-slots</literal>: checks there are no missing replication slots
+      </simpara>
+     </listitem>
+
     </itemizedlist>
   </para>
-  <para>
-   Individual checks can also be output in a Nagios-compatible format by additionally
-   providing the option <literal>--nagios</literal>.
-  </para>
   </refsect1>
+
+  <refsect1>
+    <title>Output format</title>
+    <para>
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <literal>--csv</literal>: generate output in CSV format (not available
+            for individual checks)
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <literal>--nagios</literal>: generate output in a Nagios-compatible format
+          </simpara>
+        </listitem>
+      </itemizedlist>
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Exit codes</title>
+
+    <para>
+      When executing <command>repmgr node check</command> with one of the individual
+      checks listed above, &repmgr; will emit one of the following Nagios-style exit codes
+      (even if <literal>--nagios</literal> is not supplied):
+
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <literal>0</literal>: OK
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <literal>1</literal>: WARNING
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <literal>2</literal>: ERROR
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <literal>3</literal>: UNKNOWN
+          </simpara>
+        </listitem>
+
+      </itemizedlist>
+    </para>
+
+
+
+    <para>
+      Following exit codes can be emitted by <command>repmgr status check</command>
+      if no individual check was specified.
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            No issues were detected.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_NODE_STATUS (25)</option></term>
+        <listitem>
+          <para>
+            One or more issues were detected.
+          </para>
+        </listitem>
+      </varlistentry>
+
+   </variablelist>
+  </refsect1>
+
+
+
+  <refsect1>
+    <title>See also</title>
+    <para>
+     <xref linkend="repmgr-node-status">, <xref linkend="repmgr-cluster-show">
+    </para>
+  </refsect1>
+
 </refentry>

doc/repmgr-node-rejoin.sgml

@@ -28,6 +28,10 @@
         If the node is running and needs to be attached to the current primary, use
         <xref linkend="repmgr-standby-follow">.
       </para>
+      <para>
+        Note <xref linkend="repmgr-standby-follow"> can only be used for standbys which have not diverged
+        from the rest of the cluster.
+      </para>
     </tip>
   </refsect1>
 
@@ -46,6 +50,95 @@
   </refsect1>
 
   <refsect1>
+
+    <title>Options</title>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>--dry-run</option></term>
+        <listitem>
+          <para>
+            Check prerequisites but don't actually execute the rejoin.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--force-rewind[=/path/to/pg_rewind]</option></term>
+        <listitem>
+          <para>
+            Execute <application>pg_rewind</application>.
+          </para>
+          <para>
+            It is only necessary to provide the <application>pg_rewind</application> path
+            if using PostgreSQL 9.3 or 9.4, and <application>pg_rewind</application>
+            is not installed in the PostgreSQL <filename>bin</filename> directory.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--config-files</option></term>
+        <listitem>
+          <para>
+            comma-separated list of configuration files to retain after
+            executing <application>pg_rewind</application>.
+          </para>
+          <para>
+            Currently <application>pg_rewind</application> will overwrite
+            the local node's configuration files with the files from the source node,
+            so it's advisable to use this option to ensure they are kept.
+          </para>
+        </listitem>
+      </varlistentry>
+
+
+      <varlistentry>
+        <term><option>--config-archive-dir</option></term>
+        <listitem>
+          <para>
+            Directory to temporarily store configuration files specified with
+            <option>--config-files</option>; default: <filename>/tmp</filename>.
+          </para>
+        </listitem>
+      </varlistentry>
+
+
+      <varlistentry>
+        <term><option>-W/--no-wait</option></term>
+        <listitem>
+          <para>
+            Don't wait for the node to rejoin cluster.
+          </para>
+          <para>
+            If this option is supplied, &repmgr; will restart the node but
+            not wait for it to connect to the primary.
+          </para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+  <refsect1>
+    <title>Configuration file settings</title>
+
+    <para>
+      <itemizedlist spacing="compact" mark="bullet">
+       <listitem>
+         <simpara>
+           <literal>node_rejoin_timeout</literal>:
+		   the maximum length of time (in seconds) to wait for
+		   the node to reconnect to the replication cluster (defaults to
+		   the value set in <literal>standby_reconnect_timeout</literal>,
+		   60 seconds).
+		 </simpara>
+	   </listitem>
+	  </itemizedlist>
+	</para>
+
+  </refsect1>
+
+  <refsect1 id="repmgr-node-rejoin-events">
     <title>Event notifications</title>
     <para>
       A <literal>node_rejoin</literal> <link linkend="event-notifications">event notification</link> will be generated.
@@ -77,11 +170,18 @@
   </refsect1>
 
   <refsect1 id="repmgr-node-rejoin-pg-rewind" xreflabel="Using pg_rewind">
+
+   <indexterm>
+      <primary>pg_rewind</primary>
+      <secondary>using with "repmgr node rejoin"</secondary>
+    </indexterm>
+
     <title>Using <command>pg_rewind</command></title>
     <para>
       <command>repmgr node rejoin</command> can optionally use <command>pg_rewind</command> to re-integrate a
       node which has diverged from the rest of the cluster, typically a failed primary.
-      <command>pg_rewind</command> is available in PostgreSQL 9.5 and later.
+      <command>pg_rewind</command> is available in PostgreSQL 9.5 and later as part of the core distribution,
+      and can be installed from external sources for PostgreSQL 9.3 and 9.4.
     </para>
     <note>
       <para>
@@ -93,7 +193,7 @@
     </note>
 
     <para>
-      To have <command>repmgr node rejoin</command> use <command>pg_rewind</command> if required,
+      To have <command>repmgr node rejoin</command> use <command>pg_rewind</command>,
       pass the command line option <literal>--force-rewind</literal>, which will tell &repmgr;
       to execute <command>pg_rewind</command> to ensure the node can be rejoined successfully.
     </para>
@@ -126,6 +226,15 @@
     INFO: pg_rewind would now be executed
     DETAIL: pg_rewind command is:
       pg_rewind -D '/var/lib/postgresql/data' --source-server='host=node1 dbname=repmgr user=repmgr'</programlisting>
+
+    <note>
+      <para>
+        If <option>--force-rewind</option> is used with the <option>--dry-run</option> option,
+        this checks the prerequisites for using <application>pg_rewind</application>, but cannot
+        predict the outcome of actually executing <application>pg_rewind</application>.
+      </para>
+    </note>
+
     <programlisting>
     $ repmgr node rejoin -f /etc/repmgr.conf -d 'host=node1 dbname=repmgr user=repmgr' \
          --force-rewind --config-files=postgresql.local.conf,postgresql.conf --verbose

doc/repmgr-node-status.sgml

@@ -24,7 +24,7 @@
     <title>Example</title>
     <para>
     <programlisting>
-        $ repmgr -f /etc/repmgr.comf node status
+        $ repmgr -f /etc/repmgr.conf node status
         Node "node1":
             PostgreSQL version: 10beta1
             Total data size: 30 MB
@@ -38,10 +38,54 @@
     </para>
   </refsect1>
 
+  <refsect1>
+    <title>Output format</title>
+    <para>
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <literal>--csv</literal>: generate output in CSV format
+          </simpara>
+        </listitem>
+      </itemizedlist>
+    </para>
+  </refsect1>
+
+  <refsect1>
+    <title>Exit codes</title>
+    <para>
+      Following exit codes can be emitted by <command>repmgr node status</command>:
+    </para>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>SUCCESS (0)</option></term>
+        <listitem>
+          <para>
+            No issues were detected.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>ERR_NODE_STATUS (25)</option></term>
+        <listitem>
+          <para>
+            One or more issues were detected.
+          </para>
+        </listitem>
+      </varlistentry>
+
+   </variablelist>
+  </refsect1>
+
+
   <refsect1>
     <title>See also</title>
     <para>
-      See <xref linkend="repmgr-node-check"> to diagnose issues.
+      See <xref linkend="repmgr-node-check"> to diagnose issues and <xref linkend="repmgr-cluster-show">
+      for an overview of all nodes in the cluster.
     </para>
   </refsect1>
 </refentry>

doc/repmgr-primary-register.sgml

@@ -17,7 +17,7 @@
     <title>Description</title>
     <para>
       <command>repmgr primary register</command> registers a primary node in a
-      streaming replication cluster, and configures it for use with repmgr, including
+      streaming replication cluster, and configures it for use with &repmgr;, including
       installing the &repmgr; extension. This command needs to be executed before any
       standby nodes are registered.
     </para>
@@ -63,7 +63,7 @@
       </varlistentry>
 
       <varlistentry>
-       <term><option>-F</option><option>--force</option></term>
+       <term><option>-F</option>, <option>--force</option></term>
         <listitem>
           <para>
             Overwrite an existing node record
@@ -75,10 +75,18 @@
   </refsect1>
 
 
-  <refsect1>
+  <refsect1 id="repmgr-primary-register-events">
     <title>Event notifications</title>
     <para>
-      A <literal>primary_register</literal> <link linkend="event-notifications">event notification</link> will be generated.
+      Following <link linkend="event-notifications">event notifications</link> will be generated:
+      <itemizedlist spacing="compact" mark="bullet">
+        <listitem>
+          <simpara><literal>cluster_created</literal></simpara>
+        </listitem>
+        <listitem>
+          <simpara><literal>primary_register</literal></simpara>
+        </listitem>
+      </itemizedlist>
     </para>
   </refsect1>
 

doc/repmgr-primary-unregister.sgml

@@ -64,7 +64,7 @@
 
   </refsect1>
 
-  <refsect1>
+  <refsect1 id="repmgr-primary-unregister-events">
     <title>Event notifications</title>
     <para>
       A <literal>primary_unregister</literal> <link linkend="event-notifications">event notification</link> will be generated.

doc/repmgr-standby-clone.sgml

@@ -25,9 +25,11 @@
     <note>
       <simpara>
         <command>repmgr standby clone</command> does not start the standby, and after cloning
-        <command>repmgr standby register</command> must be executed to notify &repmgr; of its presence.
+        a standby, the command <command>repmgr standby register</command> must be executed to
+        notify &repmgr; of its existence.
       </simpara>
     </note>
+
   </refsect1>
 
 
@@ -47,7 +49,7 @@
     not be copied by default. &repmgr; can copy these files, either to the same
     location on the standby server (provided appropriate directory and file permissions
     are available), or into the standby's data directory. This requires passwordless
-    SSH access to the primary server. Add the option <literal>--copy-external-config-files</literal>
+    SSH access to the primary server. Add the option <option>--copy-external-config-files</option>
     to the <command>repmgr standby clone</command> command; by default files will be copied to
     the same path as on the upstream server. Note that the user executing <command>repmgr</command>
     must have write access to those directories.
@@ -57,15 +59,96 @@
     <literal>--copy-external-config-files=pgdata</literal>, but note that
     any include directives in the copied files may need to be updated.
    </para>
+
+   <note>
+	 <para>
+	   When executing <command>repmgr standby clone</command> with the
+	   <option>--copy-external-config-files</option> aand <option>--dry-run</option>
+	   options, &repmgr; will check the SSH connection to the source node, but
+	   will not verify whether the files can actually be copied.
+	 </para>
+	 <para>
+	   During the actual clone operation, a check will be made before the database itself
+	   is cloned to determine whether the files can actually be copied; if any problems are
+	   encountered, the clone operation will be aborted, enabling the user to fix
+	   any issues before retrying the clone operation.
+	 </para>
+   </note>
+
    <tip>
     <simpara>
      For reliable configuration file management we recommend using a
      configuration management tool such as Ansible, Chef, Puppet or Salt.
     </simpara>
    </tip>
+
   </refsect1>
 
-  <refsect1 id="repmgr-standby-clone-wal-management" xreflabel="Managing WAL during the cloning process">
+  <refsect1 id="repmgr-standby-clone-recovery-conf">
+   <indexterm>
+     <primary>recovery.conf</primary>
+     <secondary>customising with "repmgr standby clone"</secondary>
+   </indexterm>
+
+   <title>Customising recovery.conf</title>
+   <para>
+     By default, &repmgr; will create a minimal <filename>recovery.conf</filename>
+     containing following parameters:
+   </para>
+
+   <itemizedlist spacing="compact" mark="bullet">
+
+     <listitem>
+       <simpara><varname>standby_mode</varname> (always <literal>'on'</literal>)</simpara>
+     </listitem>
+
+     <listitem>
+       <simpara><varname>recovery_target_timeline</varname> (always <literal>'latest'</literal>)</simpara>
+     </listitem>
+
+     <listitem>
+       <simpara><varname>primary_conninfo</varname></simpara>
+     </listitem>
+
+     <listitem>
+       <simpara><varname>primary_slot_name</varname> (if replication slots in use)</simpara>
+     </listitem>
+
+   </itemizedlist>
+
+   <para>
+     The following additional parameters can be specified in <filename>repmgr.conf</filename>
+     for inclusion in <filename>recovery.conf</filename>:
+   </para>
+
+   <itemizedlist spacing="compact" mark="bullet">
+
+     <listitem>
+       <simpara><varname>restore_command</varname></simpara>
+     </listitem>
+
+     <listitem>
+       <simpara><varname>archive_cleanup_command</varname></simpara>
+     </listitem>
+
+     <listitem>
+       <simpara><varname>recovery_min_apply_delay</varname></simpara>
+     </listitem>
+
+   </itemizedlist>
+
+   <note>
+     <para>
+       We recommend using <ulink url="https://www.pgbarman.org/">Barman</ulink> to manage
+       WAL file archiving. For more details on combining &repmgr; and <application>Barman</application>,
+       in particular using <varname>restore_command</varname> to configure Barman as a backup source of
+       WAL files, see <xref linkend="cloning-from-barman">.
+     </para>
+   </note>
+
+  </refsect1>
+
+  <refsect1 id="repmgr-standby-clone-wal-management">
    <title>Managing WAL during the cloning process</title>
    <para>
     When initially cloning a standby, you will need to ensure
@@ -102,15 +185,22 @@
 
 
   <refsect1 id="repmgr-standby-create-recovery-conf">
+
+   <indexterm>
+     <primary>recovery.conf</primary>
+     <secondary>generating for a standby cloned by another method</secondary>
+   </indexterm>
+
    <title>Using a standby cloned by another method</title>
    <para>
      &repmgr; supports standbys cloned by another method (e.g. using <application>barman</application>'s
-     <command>barman recover</command> command).
+     <command><ulink url="http://docs.pgbarman.org/release/2.4/#recover">barman recover</ulink></command> command).
    </para>
    <para>
      To integrate the standby as a &repmgr; node, ensure the <filename>repmgr.conf</filename>
-     file is created for the node, then execute the command
-     <command>repmgr standby clone --recovery-conf-only</command>.
+     file is created for the node, and that it has been registered using
+     <command><link linkend="repmgr-standby-register">repmgr standby register</link></command>.
+     Then execute the command <command>repmgr standby clone --recovery-conf-only</command>.
      This will create the <filename>recovery.conf</filename> file needed to attach
      the node to its upstream, and will also create a replication slot on the
      upstream node if required.
@@ -125,6 +215,13 @@
      to check the prerequisites for creating the <filename>recovery.conf</filename> file,
      and display the contents of the file without actually creating it.
    </para>
+
+   <note>
+     <para>
+       <option>--recovery-conf-only</option> was introduced in &repmgr; <link linkend="release-4.0.4">4.0.4</link>.
+     </para>
+   </note>
+
   </refsect1>
 
   <refsect1>
@@ -133,6 +230,15 @@
 
     <variablelist>
 
+      <varlistentry>
+        <term><option>-d, --dbname=CONNINFO</option></term>
+        <listitem>
+          <para>
+            Connection string of the upstream node to use for cloning.
+          </para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>--dry-run</option></term>
         <listitem>
@@ -151,7 +257,7 @@
         <term><option>-c, --fast-checkpoint</option></term>
         <listitem>
           <para>
-            force fast checkpoint (not effective when cloning from Barman
+            Force fast checkpoint (not effective when cloning from Barman).
           </para>
         </listitem>
       </varlistentry>
@@ -160,7 +266,7 @@
         <term><option>--copy-external-config-files[={samepath|pgdata}]</option></term>
         <listitem>
           <para>
-            copy configuration files located outside the data directory on the source
+            Copy configuration files located outside the data directory on the source
             node to the same path on the standby (default) or to the
             PostgreSQL data directory.
           </para>
@@ -171,7 +277,7 @@
         <term><option>--no-upstream-connection</option></term>
         <listitem>
           <para>
-            when using Barman, do not connect to upstream node
+            When using Barman, do not connect to upstream node.
           </para>
         </listitem>
       </varlistentry>
@@ -180,7 +286,7 @@
         <term><option>-R, --remote-user=USERNAME</option></term>
         <listitem>
           <para>
-            remote system username for SSH operations (default: current local system username)
+            Remote system username for SSH operations (default: current local system username).
           </para>
         </listitem>
       </varlistentry>
@@ -189,7 +295,7 @@
         <term><option> --recovery-conf-only</option></term>
         <listitem>
           <para>
-            create <filename>recovery.conf</filename> file for a previously cloned instance
+            Create <filename>recovery.conf</filename> file for a previously cloned instance. &repmgr 4.0.4 and later.
           </para>
         </listitem>
       </varlistentry>
@@ -198,7 +304,7 @@
         <term><option>--replication-user</option></term>
         <listitem>
           <para>
-            user to make replication connections with (optional, not usually required)
+            User to make replication connections with (optional, not usually required).
           </para>
         </listitem>
       </varlistentry>
@@ -207,8 +313,8 @@
         <term><option>--superuser</option></term>
         <listitem>
           <para>
-            if the &repmgr; user is not a superuser, the name of a valid superuser must
-            be provided with this option
+            If the &repmgr; user is not a superuser, the name of a valid superuser must
+            be provided with this option.
           </para>
         </listitem>
       </varlistentry>
@@ -219,7 +325,7 @@
         <listitem>
           <para>
             <literal>primary_conninfo</literal> value to write in recovery.conf
-            when the intended upstream server does not yet exist
+            when the intended upstream server does not yet exist.
           </para>
         </listitem>
       </varlistentry>
@@ -236,7 +342,7 @@
         <term><option>--without-barman </option></term>
         <listitem>
           <para>
-            do not use Barman even if configured
+            Do not use Barman even if configured.
           </para>
         </listitem>
       </varlistentry>
@@ -244,12 +350,18 @@
     </variablelist>
   </refsect1>
 
-  <refsect1>
+  <refsect1 id="repmgr-standby-clone-events">
     <title>Event notifications</title>
     <para>
       A <literal>standby_clone</literal> <link linkend="event-notifications">event notification</link> will be generated.
     </para>
   </refsect1>
 
+  <refsect1>
+    <title>See also</title>
+    <para>
+      See <xref linkend="cloning-standbys"> for details about various aspects of cloning.
+    </para>
+  </refsect1>
 </refentry>
 

doc/repmgr-standby-follow.sgml

@@ -26,10 +26,18 @@
       running. It can only be used to attach an active standby to the current primary node
    (and not to another standby).
     </para>
-    <para>
-      To re-add an inactive node to the replication cluster, see
-      <xref linkend="repmgr-node-rejoin">
-    </para>
+	<tip>
+      <para>
+		To re-add an inactive node to the replication cluster, use
+		<xref linkend="repmgr-node-rejoin">.
+      </para>
+	</tip>
+
+	<para>
+	  <command>repmgr standby follow</command> will wait up to
+	  <varname>standby_follow_timeout</varname> seconds (default: <literal>30</literal>)
+	  to verify the standby has actually connected to the new primary.
+	</para>
 
   </refsect1>
 
@@ -71,7 +79,7 @@
       </varlistentry>
 
       <varlistentry>
-        <term><option>-W</option></term>
+        <term><option>-w</option></term>
         <term><option>--wait</option></term>
         <listitem>
           <para>
@@ -86,13 +94,13 @@
     </variablelist>
   </refsect1>
 
-  <refsect1>
+  <refsect1 id="repmgr-standby-follow-events">
     <title>Event notifications</title>
     <para>
       A <literal>standby_follow</literal> <link linkend="event-notifications">event notification</link> will be generated.
     </para>
     <para>
-      If provided, &repmgr; will subsitute the placeholders <literal>%p</literal> with the node ID of the primary
+      If provided, &repmgr; will substitute the placeholders <literal>%p</literal> with the node ID of the primary
       being followed, <literal>%c</literal> with its <literal>conninfo</literal> string, and
       <literal>%a</literal> with its node name.
     </para>

doc/repmgr-standby-promote.sgml

@@ -32,6 +32,7 @@
       check the promotion every <varname>promote_check_interval</varname> seconds (default: 1 second).
       Both values can be defined in <filename>repmgr.conf</filename>.
     </para>
+
   </refsect1>
 
   <refsect1>
@@ -49,7 +50,7 @@
   </refsect1>
 
 
-  <refsect1>
+  <refsect1 id="repmgr-standby-promote-events">
     <title>Event notifications</title>
     <para>
       A <literal>standby_promote</literal> <link linkend="event-notifications">event notification</link> will be generated.

doc/repmgr-standby-register.sgml

@@ -159,7 +159,7 @@
     </variablelist>
   </refsect1>
 
-  <refsect1>
+  <refsect1 id="repmgr-standby-register-events">
     <title>Event notifications</title>
     <para>
       A <literal>standby_register</literal> <link linkend="event-notifications">event notification</link>
@@ -173,7 +173,7 @@
     </para>
 
     <para>
-      If provided, &repmgr; will subsitute the placeholders <literal>%p</literal> with the node ID of the
+      If provided, &repmgr; will substitute the placeholders <literal>%p</literal> with the node ID of the
       primary node, <literal>%c</literal> with its <literal>conninfo</literal> string, and
       <literal>%a</literal> with its node name.
     </para>

doc/repmgr-standby-switchover.sgml

@@ -12,6 +12,7 @@
     <refpurpose>promote a standby to primary and demote the existing primary to a standby</refpurpose>
   </refnamediv>
 
+
   <refsect1>
     <title>Description</title>
 
@@ -34,7 +35,29 @@
         &repmgr; will attempt to check for potential issues but cannot guarantee
         a successful switchover.
       </para>
+      <para>
+        &repmgr; will refuse to perform the switchover if an exclusive backup is running on
+        the current primary.
+      </para>
     </note>
+    <para>
+      For more details on performing a switchover, including preparation and configuration,
+      see section <xref linkend="performing-switchover">.
+    </para>
+
+    <note>
+      <para>
+        From <link linkend="release-4.2">repmgr 4.2</link>, &repmgr; will instruct any running
+        <application>repmgrd</application> instances to pause operations while the switchover
+        is being carried out, to prevent <application>repmgrd</application> from
+        unintentionally promoting a node. For more details, see <xref linkend="repmgrd-pausing">.
+      </para>
+      <para>
+        Users of &repmgr; versions prior to 4.2 should ensure that <application>repmgrd</application>
+        is not running on any nodes while a switchover is being executed.
+      </para>
+    </note>
+
   </refsect1>
 
   <refsect1>
@@ -45,8 +68,9 @@
         <term><option>--always-promote</option></term>
         <listitem>
           <para>
-            Promote standby to primary, even if it is behind original primary
-            (original primary will be shut down in any case).
+            Promote standby to primary, even if it is behind or has diverged
+            from the original primary. The original primary will be shut down in any case,
+            and will need to be manually reintegrated into the replication cluster.
           </para>
         </listitem>
       </varlistentry>
@@ -84,11 +108,14 @@
       </varlistentry>
 
       <varlistentry>
-        <term><option>--force-rewind</option></term>
+        <term><option>--force-rewind[=/path/to/pg_rewind]</option></term>
         <listitem>
           <para>
             Use <application>pg_rewind</application> to reintegrate the old primary if necessary
-            (PostgreSQL 9.5 and later).
+            (and the prerequisites for using <application>pg_rewind</application> are met).
+            If using PostgreSQL 9.3 or 9.4, and the <application>pg_rewind</application>
+            binary is not installed in the PostgreSQL <filename>bin</filename> directory,
+            provide its full path. For more details see also <xref linkend="switchover-pg-rewind">.
           </para>
         </listitem>
       </varlistentry>
@@ -103,6 +130,21 @@
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>--repmgrd-no-pause</option></term>
+        <listitem>
+          <para>
+            Don't pause <application>repmgrd</application> while executing a switchover.
+          </para>
+          <para>
+            This option should not be used unless you take steps by other means
+            to ensure <application>repmgrd</application> is paused or not
+            running on all nodes.
+          </para>
+        </listitem>
+      </varlistentry>
+
+
      <varlistentry>
         <term><option>--siblings-follow</option></term>
         <listitem>
@@ -115,6 +157,55 @@
 
   </refsect1>
 
+  <refsect1>
+    <title>Configuration file settings</title>
+
+    <para>
+     Note that following parameters in <filename>repmgr.conf</filename> are relevant to the
+     switchover operation:
+     <itemizedlist spacing="compact" mark="bullet">
+
+       <listitem>
+         <simpara>
+           <literal>replication_lag_critical</literal>:
+           if replication lag (in seconds) on the standby exceeds this value, the
+           switchover will be aborted (unless the <literal>-F/--force</literal> option
+           is provided)
+         </simpara>
+       </listitem>
+
+       <listitem>
+         <simpara>
+           <literal>shutdown_check_timeout</literal>: maximum number of seconds to wait for the
+           demotion candidate (current primary) to shut down, before aborting the switchover.
+         </simpara>
+         <simpara>
+           Note that this parameter is set on the node where <command>repmgr standby switchover</command>
+           is executed (promotion candidate); setting it on the demotion candidate (former primary) will
+           have no effect.
+         </simpara>
+         <note>
+           <para>
+             In versions prior to <link linkend="release-4.2">&repmgr; 4.2</link>, <command>repmgr standby switchover</command> would
+             use the values defined in <literal>reconnect_attempts</literal> and <literal>reconnect_interval</literal>
+             to determine the timeout for demotion candidate shutdown.
+           </para>
+         </note>
+       </listitem>
+
+       <listitem>
+         <simpara>
+           <literal>standby_reconnect_timeout</literal>:
+           maximum number of seconds to attempt to wait for the demotion candidate (former primary)
+           to reconnect to the promoted primary (default: 60 seconds)
+         </simpara>
+       </listitem>
+
+     </itemizedlist>
+    </para>
+  </refsect1>
+
+
   <refsect1>
     <title>Execution</title>
 
@@ -122,10 +213,12 @@
       Execute with the <literal>--dry-run</literal> option to test the switchover as far as
       possible without actually changing the status of either node.
     </para>
-    <para>
-      <application>repmgrd</application> should not be active on any nodes while a switchover is being
-      executed. This restriction may be lifted in a later version.
-    </para>
+    <important>
+      <para>
+        <application>repmgrd</application> must be shut down on all nodes while a switchover is being
+        executed. This restriction will be removed in a future &repmgr; version.
+      </para>
+    </important>
     <para>
       External database connections, e.g. from an application, should not be permitted while
       the switchover is taking place. In particular, active transactions on the primary
@@ -133,7 +226,7 @@
     </para>
   </refsect1>
 
-  <refsect1>
+  <refsect1 id="repmgr-standby-switchover-events">
     <title>Event notifications</title>
     <para>
       <literal>standby_switchover</literal> and <literal>standby_promote</literal>
@@ -150,7 +243,7 @@
   <refsect1>
     <title>Exit codes</title>
     <para>
-      Following exit codes can be emitted by <literal>repmgr standby switchover</literal>:
+      Following exit codes can be emitted by <command>repmgr standby switchover</command>:
     </para>
     <variablelist>
 
@@ -178,7 +271,7 @@
           <para>
             The switchover was executed but a problem was encountered.
             Typically this means the former primary could not be reattached
-            as a standby.
+            as a standby. Check preceding log messages for more information.
           </para>
         </listitem>
       </varlistentry>

doc/repmgr-standby-unregister.sgml

@@ -59,7 +59,7 @@
     </variablelist>
   </refsect1>
 
-  <refsect1>
+  <refsect1 id="repmgr-standby-unregister-events">
     <title>Event notifications</title>
     <para>
       A <literal>standby_unregister</literal> <link linkend="event-notifications">event notification</link> will be generated.

doc/repmgr-witness-register.sgml

@@ -50,7 +50,7 @@
   </refsect1>
 
 
-  <refsect1>
+  <refsect1 id="repmgr-witness-register-events">
     <title>Event notifications</title>
     <para>
       A <literal>witness_register</literal> <link linkend="event-notifications">event notification</link> will be generated.

doc/repmgr-witness-unregister.sgml

@@ -20,7 +20,10 @@
     </para>
     <para>
       The node does not have to be running to be unregistered, however if this is the
-      case then connection information for the primary server must be provided.
+      case then either provide connection information for the primary server, or
+	  execute <command>repmgr witness unregister</command> on a running node and
+	  provide the parameter <option>--node-id</option> with the node ID of the
+	  witness server.
     </para>
     <para>
       Execute with the <literal>--dry-run</literal> option to check what would happen
@@ -36,17 +39,17 @@
     INFO: connecting to witness node "node3" (ID: 3)
     INFO: unregistering witness node 3
     INFO: witness unregistration complete
-    DETAIL: witness node with id 3 (conninfo: host=node3 dbname=repmgr user=repmgr port=5499) successfully unregistered</programlisting>
+    DETAIL: witness node with UD 3 successfully unregistered</programlisting>
     </para>
     <para>
       Unregistering a non-running witness node:
       <programlisting>
         $ repmgr -f /etc/repmgr.conf witness unregister -h node1 -p 5501  -F
-        INFO: connecting to witness node "node3" (ID: 3)
-        NOTICE: unable to connect to witness node "node3" (ID: 3), removing node record on cluster primary only
+        INFO: connecting to node "node3" (ID: 3)
+        NOTICE: unable to connect to node "node3" (ID: 3), removing node record on cluster primary only
         INFO: unregistering witness node 3
         INFO: witness unregistration complete
-        DETAIL: witness node with id 3 (conninfo: host=node3 dbname=repmgr user=repmgr port=5499) successfully unregistered</programlisting>
+        DETAIL: witness node with id ID 3 successfully unregistered</programlisting>
     </para>
   </refsect1>
 
@@ -62,8 +65,34 @@
     </para>
   </refsect1>
 
-
   <refsect1>
+
+    <title>Options</title>
+    <variablelist>
+
+      <varlistentry>
+        <term><option>--dry-run</option></term>
+        <listitem>
+          <para>
+            Check prerequisites but don't actually unregister the witness.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+       <term><option>--node-id</option></term>
+        <listitem>
+          <para>
+            Unregister witness server with the specified node ID.
+          </para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+
+
+  <refsect1 id="repmgr-witness-unregister-events">
     <title>Event notifications</title>
     <para>
       A <literal>witness_unregister</literal> <link linkend="event-notifications">event notification</link> will be generated.

doc/repmgr.sgml

@@ -86,6 +86,7 @@
   &repmgrd-cascading-replication;
   &repmgrd-network-split;
   &repmgrd-witness-server;
+  &repmgrd-pausing;
   &repmgrd-degraded-monitoring;
   &repmgrd-monitoring;
   &repmgrd-bdr;
@@ -112,6 +113,9 @@
   &repmgr-cluster-crosscheck;
   &repmgr-cluster-event;
   &repmgr-cluster-cleanup;
+  &repmgr-daemon-status;
+  &repmgr-daemon-pause;
+  &repmgr-daemon-unpause;
  </part>
 
  &appendix-release-notes;

doc/repmgrd-bdr.sgml

@@ -15,7 +15,7 @@
   </para>
   <note>
     <simpara>
-      Due to the nature of BDR, it's only safe to use this solution for
+      Due to the nature of BDR 1.x/2.x, it's only safe to use this solution for
       a two-node scenario. Introducing additional nodes will create an inherent
       risk of node desynchronisation if a node goes down without being cleanly
       removed from the cluster.
@@ -99,15 +99,16 @@
       replication cluster. The database must be the BDR-enabled database.
     </para>
     <para>
-      If defined, the evenr <application>event_notifications</application> parameter
-      will restrict execution of <varname>event_notification_command</varname>
+      If defined, the <varname>event_notifications</varname> parameter will restrict
+      execution of the script defined in  <varname>event_notification_command</varname>
       to the specified event(s).
     </para>
     <note>
       <simpara>
         <varname>event_notification_command</varname> is the script which does the actual "heavy lifting"
         of reconfiguring the proxy server/ connection pooler. It is fully
-        user-definable; a reference implementation is documented below.
+        user-definable; see section <xref linkend="bdr-event-notification-command"> for a reference
+        implementation.
       </simpara>
     </note>
 
@@ -169,8 +170,8 @@
     </para>
   </sect1>
 
-  <sect1 id="bdr-event-notification-command" xreflabel="BDR failover event notification command">
-    <title>Defining the "event_notification_command"</title>
+  <sect1 id="bdr-event-notification-command" xreflabel="Defining the BDR failover &quot;event_notification command&quot;">
+    <title>Defining the BDR failover "event_notification_command"</title>
     <para>
       Key to "failover" execution is the <literal>event_notification_command</literal>,
       which is a user-definable script specified in <filename>repmpgr.conf</filename>

doc/repmgrd-configuration.sgml

@@ -1,60 +1,499 @@
 <chapter id="repmgrd-configuration">
 
- <indexterm>
-   <primary>repmgrd</primary>
-   <secondary>configuration</secondary>
- </indexterm>
+  <indexterm>
+    <primary>repmgrd</primary>
+    <secondary>configuration</secondary>
+  </indexterm>
 
- <title>repmgrd configuration</title>
- <para>
-  To use <application>repmgrd</application>, its associated function library must be
-  included in <filename>postgresql.conf</filename> with:
+  <title>repmgrd configuration</title>
 
-  <programlisting>
-    shared_preload_libraries = 'repmgr'</programlisting>
- </para>
- <para>
-  Changing this setting requires a restart of PostgreSQL; for more details see
-  the <ulink url="https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">PostgreSQL documentation</ulink>.
- </para>
- <para>
-  Additionally the following <application>repmgrd</application> options *must* be set in
-  <filename>repmgr.conf</filename> (adjust configuration file locations as appropriate):
-  <programlisting>
-    failover=automatic
-    promote_command='repmgr standby promote -f /etc/repmgr.conf --log-to-file'
-    follow_command='repmgr standby follow -f /etc/repmgr.conf --log-to-file --upstream-node-id=%n'</programlisting>
- </para>
- <para>
-  Note that the <literal>--log-to-file</literal> option will cause
-  output generated by the &repmgr; command, when executed by <application>repmgrd</application>,
-  to be logged to the same destination configured to receive log output for <application>repmgrd</application>.
-  See <filename>repmgr.conf.sample</filename> for further <application>repmgrd</application>-specific settings.
- </para>
- <para>
-  When <varname>failover</varname> is set to <literal>automatic</literal>, upon detecting failure
-  of the current  primary, <application>repmgrd</application> will execute one of
-  <varname>promote_command</varname> or <varname>follow_command</varname>,
-  depending on whether the current server is to become the new primary, or
-  needs to follow another server which has become the new primary. Note that
-  these commands can be any valid shell script which results in one of these
-  two actions happening, but if &repmgr;'s <command>standby follow</command> or
-  <command>standby promote</command>
-  commands are not executed (either directly as shown here, or from a script which
-  performs other actions), the &repmgr; metadata will not be updated and
-  &repmgr; will no longer function reliably.
- </para>
- <para>
-  The <varname>follow_command</varname> should provide the <literal>--upstream-node-id=%n</literal>
-  option to <command>repmgr standby follow</command>; the <literal>%n</literal> will be replaced by
-  <application>repmgrd</application> with the ID of the new primary node. If this is not provided, &repmgr;
-  will attempt to determine the new primary by itself, but  if the
-  original primary comes back online after the new primary is promoted, there is a risk that
-  <command>repmgr standby follow</command> will result in the node continuing to follow
-  the original primary.
- </para>
- <sect1 id="repmgrd-connection-settings">
- <title>repmgrd connection settings</title>
+  <para>
+    <application>repmgrd</application> is a daemon which runs on each PostgreSQL node,
+    monitoring the local node, and (unless it's the primary node) the upstream server
+    (the primary server or with cascading replication, another standby) which it's
+    connected to.
+  </para>
+  <para>
+    <application>repmgrd</application> can be configured to provide failover
+    capability in case the primary upstream node becomes unreachable, and/or
+    provide monitoring data to the &repmgr; metadatabase.
+  </para>
+
+  <sect1 id="repmgrd-basic-configuration">
+    <title>repmgrd basic configuration</title>
+
+    <para>
+      To use <application>repmgrd</application>, its associated function library <emphasis>must</emphasis> be
+      included via <filename>postgresql.conf</filename> with:
+
+      <programlisting>
+        shared_preload_libraries = 'repmgr'</programlisting>
+    </para>
+    <para>
+      Changing this setting requires a restart of PostgreSQL; for more details see
+      the <ulink url="https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">PostgreSQL documentation</ulink>.
+    </para>
+
+
+    <sect2 id="repmgrd-automatic-failover-configuration">
+      <title>automatic failover configuration</title>
+      <para>
+        If using automatic failover, the following <application>repmgrd</application> options *must* be set in
+        <filename>repmgr.conf</filename> :
+        <programlisting>
+          failover=automatic
+          promote_command='/usr/bin/repmgr standby promote -f /etc/repmgr.conf --log-to-file'
+          follow_command='/usr/bin/repmgr standby follow -f /etc/repmgr.conf --log-to-file --upstream-node-id=%n'</programlisting>
+      </para>
+      <para>
+        Adjust file paths as appropriate; alway specify the full path to the &repmgr; binary.
+      </para>
+
+      <note>
+        <para>
+          &repmgr; will not apply <option>pg_bindir</option> when executing <option>promote_command</option>
+          or <option>follow_command</option>; these can be user-defined scripts so must always be
+          specified with the full path.
+        </para>
+      </note>
+
+      <para>
+        Note that the <literal>--log-to-file</literal> option will cause
+        output generated by the &repmgr; command, when executed by <application>repmgrd</application>,
+        to be logged to the same destination configured to receive log output for <application>repmgrd</application>.
+        See <filename><ulink url="https://raw.githubusercontent.com/2ndQuadrant/repmgr/master/repmgr.conf.sample">repmgr.conf.sample</ulink></filename>
+        for further <application>repmgrd</application>-specific settings.
+      </para>
+      <para>
+        When <varname>failover</varname> is set to <literal>automatic</literal>, upon detecting failure
+        of the current  primary, <application>repmgrd</application> will execute one of:
+      </para>
+      <itemizedlist spacing="compact" mark="bullet">
+        <listitem>
+          <simpara>
+            <varname>promote_command</varname> (if the current server is to become the new primary)
+          </simpara>
+        </listitem>
+        <listitem>
+          <simpara>
+            <varname>follow_command</varname> (if the current server needs to follow another server which has
+            become the new primary)
+          </simpara>
+        </listitem>
+      </itemizedlist>
+      <note>
+        <para>
+          These commands can be any valid shell script which results in one of these
+          two actions happening, but if &repmgr;'s <command>standby follow</command> or
+          <command>standby promote</command>
+          commands are not executed (either directly as shown here, or from a script which
+          performs other actions), the &repmgr; metadata will not be updated and
+          &repmgr; will no longer function reliably.
+        </para>
+      </note>
+
+      <para>
+        The <varname>follow_command</varname> should provide the <literal>--upstream-node-id=%n</literal>
+        option to <command>repmgr standby follow</command>; the <literal>%n</literal> will be replaced by
+        <application>repmgrd</application> with the ID of the new primary node. If this is not provided, &repmgr;
+        will attempt to determine the new primary by itself, but if the
+        original primary comes back online after the new primary is promoted, there is a risk that
+        <command>repmgr standby follow</command> will result in the node continuing to follow
+        the original primary.
+      </para>
+    </sect2>
+
+    <sect2 id="repmgrd-service-configuration">
+      <indexterm>
+        <primary>repmgrd</primary>
+        <secondary>PostgreSQL service configuration</secondary>
+      </indexterm>
+      <title>PostgreSQL service configuration</title>
+      <para>
+        If using automatic failover, currently <application>repmgrd</application> will need to execute
+        <link linkend="repmgr-standby-follow"><command>repmgr standby follow</command></link>
+        to restart PostgreSQL on standbys to have them follow a new primary.
+      </para>
+      <para>
+        To ensure this happens smoothly, it's essential to provide the appropriate system/service restart
+        command appropriate to your operating system via <varname>service_restart_command</varname>
+        in <filename>repmgr.conf</filename>. If you don't do this, <application>repmgrd</application>
+        will default to using <command>pg_ctl</command>, which can result in unexpected problems,
+        particularly on <application>systemd</application>-based systems.
+      </para>
+      <para>
+        For more details, see <xref linkend="configuration-file-service-commands">.
+      </para>
+    </sect2>
+
+    <sect2 id="repmgrd-monitoring-configuration" xreflabel="repmgrd monitoring configuration">
+      <indexterm>
+        <primary>repmgrd</primary>
+        <secondary>monitoring configuration</secondary>
+      </indexterm>
+      <title>Monitoring configuration</title>
+      <para>
+        To enable monitoring, set:
+        <programlisting>
+          monitoring_history=yes</programlisting>
+        in <filename>repmgr.conf</filename>.
+      </para>
+      <para>
+        The default monitoring interval is 2 seconds; this value can be explicitly set using:
+        <programlisting>
+          monitor_interval_secs=&lt;seconds&gt;</programlisting>
+        in <filename>repmgr.conf</filename>.
+      </para>
+      <para>
+        For more details on monitoring, see <xref linkend="repmgrd-monitoring">.
+      </para>
+    </sect2>
+
+    <sect2 id="repmgrd-reloading-configuration"xreflabel="reloading repmgrd configuration">
+      <indexterm>
+        <primary>repmgrd</primary>
+        <secondary>applying configuration changes</secondary>
+      </indexterm>
+      <title>Applying configuration changes to repmgrd</title>
+      <para>
+        To apply configuration file changes to a running <application>repmgrd</application>
+        daemon, execute the operating system's <application>repmgrd</application> service reload command
+        (see <xref linkend="appendix-packages"> for examples),
+          or for instances  which were manually started, execute <command>kill -HUP</command>, e.g.
+          <command>kill -HUP `cat /tmp/repmgrd.pid`</command>.
+      </para>
+      <tip>
+        <para>
+          Check the <application>repmgrd</application> log to see what changes were
+          applied, or if any issues were encountered when reloading the configuration.
+        </para>
+      </tip>
+      <para>
+        Note that only the following subset of configuration file parameters can be changed on a
+        running <application>repmgrd</application> daemon:
+      </para>
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <varname>async_query_timeout</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>bdr_local_monitoring_only</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>bdr_recovery_timeout</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>conninfo</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>degraded_monitoring_timeout</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>event_notification_command</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>event_notifications</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>failover</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>follow_command</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>log_facility</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>log_file</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>log_level</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>log_status_interval</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>monitor_interval_secs</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>monitoring_history</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>primary_notification_timeout</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>promote_command</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>reconnect_attempts</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>reconnect_interval</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>repmgrd_standby_startup_timeout</varname>
+          </simpara>
+        </listitem>
+
+      </itemizedlist>
+
+      <para>
+        The following set of configuration file parameters must be updated via
+        <command><link linkend="repmgr-standby-register">repmgr standby register --force</link></command>,
+        as they require changes to the <literal>repmgr.nodes</literal> table so they are visible to
+        all nodes in the replication cluster:
+      </para>
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            <varname>node_id</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>node_name</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>data_directory</varname>
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            <varname>location</varname>
+          </simpara>
+        </listitem>
+
+
+        <listitem>
+          <simpara>
+            <varname>priority</varname>
+          </simpara>
+        </listitem>
+
+      </itemizedlist>
+
+      <note>
+        <para>
+          After executing <command><link linkend="repmgr-standby-register">repmgr standby register --force</link></command>,
+          <application>repmgrd</application> <emphasis>must</emphasis> be restarted for the changes to take effect.
+        </para>
+      </note>
+
+    </sect2>
+
+  </sect1>
+
+  <sect1 id="repmgrd-daemon">
+    <indexterm>
+      <primary>repmgrd</primary>
+      <secondary>starting and stopping</secondary>
+    </indexterm>
+    <title>repmgrd daemon</title>
+    <para>
+      If installed from a package, the <application>repmgrd</application> can be started
+      via the operating system's service command, e.g. in <application>systemd</application>
+      using <command>systemctl</command>.
+    </para>
+    <para>
+      See appendix <xref linkend="appendix-packages"> for details of service commands
+      for different distributions.
+    </para>
+    <para>
+      <application>repmgrd</application> can be started manually like this:
+      <programlisting>
+        repmgrd -f /etc/repmgr.conf --pid-file /tmp/repmgrd.pid</programlisting>
+      and stopped with <command>kill `cat /tmp/repmgrd.pid`</command>. Adjust paths as appropriate.
+    </para>
+
+    <sect2 id="repmgrd-pid-file" xreflabel="repmgrd's PID file">
+      <indexterm>
+        <primary>repmgrd</primary>
+        <secondary>PID file</secondary>
+      </indexterm>
+      <indexterm>
+        <primary>PID file</primary>
+        <secondary>repmgrd</secondary>
+      </indexterm>
+      <title>repmgrd's PID file</title>
+      <para>
+        <application>repmgrd</application> will generate a PID file by default.
+      </para>
+      <note>
+        <simpara>
+          This is a behaviour change from previous versions (earlier than 4.1), where
+          the PID file had to be explicitly specified with the command line
+          parameter <option> --pid-file</option>.
+        </simpara>
+      </note>
+      <para>
+        The PID file can be specified in <filename>repmgr.conf</filename> with the configuration
+        parameter <varname>repmgrd_pid_file</varname>.
+      </para>
+      <para>
+        It can also be specified on the command line (as in previous versions) with
+        the command line parameter <option>--pid-file</option>. Note this will override
+        any value set in <filename>repmgr.conf</filename> with <varname>repmgrd_pid_file</varname>.
+        <option>--pid-file</option> may be deprecated in future releases.
+      </para>
+      <para>
+        If a PID file location was specified by the package maintainer, <application>repmgrd</application>
+        will use that. This only applies if &repmgr; was installed from a package and the package
+        maintainer has specified the PID file location.
+      </para>
+      <para>
+        If none of the above apply, <application>repmgrd</application> will create a PID file
+        in the operating system's temporary directory (das etermined by the environment variable
+        <varname>TMPDIR</varname>, or if that is not set, will use <filename>/tmp</filename>).
+      </para>
+      <para>
+        To prevent a PID file being generated at all, provide the command line option
+        <option>--no-pid-file</option>.
+      </para>
+      <para>
+        To see which PID file <application>repmgrd</application> would use, execute <application>repmgrd</application>
+        with the option <option>--show-pid-file</option>. <application>repmgrd</application>
+        will not start if this option is provided. Note that the value shown is the
+        file  <application>repmgrd</application> would use next time it starts, and is
+        not necessarily the PID file currently in use.
+      </para>
+    </sect2>
+
+    <sect2 id="repmgrd-configuration-debian-ubuntu">
+      <indexterm>
+        <primary>repmgrd</primary>
+        <secondary>Debian/Ubuntu and daemon configuration</secondary>
+      </indexterm>
+      <indexterm>
+        <primary>Debian/Ubuntu</primary>
+        <secondary>repmgrd daemon configuration</secondary>
+      </indexterm>
+
+      <title>repmgrd daemon configuration on Debian/Ubuntu</title>
+
+      <para>
+        If &repmgr; was installed from Debian/Ubuntu packages, additional configuration
+        is required before <application>repmgrd</application> is started as a daemon.
+      </para>
+      <para>
+        This is done via the file <filename>/etc/default/repmgrd</filename>, which by default
+        looks like this:
+        <programlisting>
+# default settings for repmgrd. This file is source by /bin/sh from
+# /etc/init.d/repmgrd
+
+# disable repmgrd by default so it won't get started upon installation
+# valid values: yes/no
+REPMGRD_ENABLED=no
+
+# configuration file (required)
+#REPMGRD_CONF="/path/to/repmgr.conf"
+
+# additional options
+REPMGRD_OPTS="--daemonize=false"
+
+# user to run repmgrd as
+#REPMGRD_USER=postgres
+
+# repmgrd binary
+#REPMGRD_BIN=/usr/bin/repmgrd
+
+# pid file
+#REPMGRD_PIDFILE=/var/run/repmgrd.pid</programlisting>
+      </para>
+      <para>
+        Set <varname>REPMGRD_ENABLED</varname> to <literal>yes</literal>, and <varname>REPMGRD_CONF</varname>
+        to the <filename>repmgr.conf</filename> file you are using.
+      </para>
+      <tip>
+        <para>
+          See <xref linkend="packages-debian-ubuntu"> for details of the Debian/Ubuntu packages and
+          typical file locations (including <filename>repmgr.conf</filename>).
+        </para>
+      </tip>
+      <para>
+        From <application>repmgrd</application> 4.1, ensure <varname>REPMGRD_OPTS</varname> includes
+        <option>--daemonize=false</option>, as daemonization is handled by the service command.
+        We recommend setting <varname>repmgrd_pid_file</varname> in <filename>repmgr.conf</filename> to the
+        same value set in <varname>REPMGRD_PIDFILE</varname> to prevent another <application>repmgrd</application>
+        instance from being started manually.
+      </para>
+      <para>
+        If using <application>systemd</application>, you may need to execute <command>systemctl daemon-reload</command>.
+        Also, if you attempted to start <application>repmgrd</application> using <command>systemctl start repmgrd</command>,
+        you'll need to execute <command>systemctl stop repmgrd</command>. Because that's how <application>systemd</application>
+        rolls.
+      </para>
+
+    </sect2>
+  </sect1>
+
+  <sect1 id="repmgrd-connection-settings">
+    <title>repmgrd connection settings</title>
  <para>
   In addition to the &repmgr; configuration settings, parameters in the
   <varname>conninfo</varname> string influence how &repmgr; makes a network connection to
@@ -76,25 +515,43 @@
   <ulink url="https://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-PARAMKEYWORDS">PostgreSQL documentation</ulink>.
  </para>
  </sect1>
+
+
+
  <sect1 id="repmgrd-log-rotation">
+   <indexterm>
+     <primary>log rotation</primary>
+     <secondary>repmgrd</secondary>
+   </indexterm>
+
+   <indexterm>
+     <primary>repmgrd</primary>
+     <secondary>log rotation</secondary>
+   </indexterm>
+
   <title>repmgrd log rotation</title>
   <para>
-   To ensure the current <application>repmgrd</application> logfile does not grow
-   indefinitely, configure your system's <command>logrotate</command> to
-   regularly rotate it.
+   To ensure the current <application>repmgrd</application> logfile
+   (specified in <filename>repmgr.conf</filename> with the parameter
+   <option>log_file</option>) does not grow indefinitely, configure your
+   system's <command>logrotate</command> to regularly rotate it.
   </para>
   <para>
    Sample configuration to rotate logfiles weekly with retention for
    up to 52 weeks and rotation forced if a file grows beyond 100Mb:
    <programlisting>
-    /var/log/postgresql/repmgr-9.6.log {
+    /var/log/repmgr/repmgrd.log {
         missingok
         compress
         rotate 52
         maxsize 100M
         weekly
         create 0600 postgres postgres
+        postrotate
+            /usr/bin/killall -HUP repmgrd
+        endscript
     }</programlisting>
   </para>
+
  </sect1>
 </chapter>

doc/repmgrd-degraded-monitoring.sgml

@@ -1,4 +1,4 @@
-<chapter id="repmgrd-degraded-monitoring">
+<chapter id="repmgrd-degraded-monitoring" xreflabel="repmgrd degraded monitoring">
  <indexterm>
    <primary>repmgrd</primary>
    <secondary>degraded monitoring</secondary>
@@ -7,8 +7,8 @@
  <title>"degraded monitoring" mode</title>
  <para>
   In certain circumstances, <application>repmgrd</application> is not able to fulfill its primary mission
-  of monitoring the nodes' upstream server. In these cases it enters "degraded
-  monitoring" mode, where <application>repmgrd</application> remains active but is waiting for the situation
+  of monitoring the node's upstream server. In these cases it enters &quot;degraded monitoring&quot;
+  mode, where <application>repmgrd</application> remains active but is waiting for the situation
   to be resolved.
  </para>
  <para>

doc/repmgrd-monitoring.sgml

@@ -1,8 +1,12 @@
-<chapter id="repmgrd-monitoring">
+<chapter id="repmgrd-monitoring" xreflabel="Monitoring with repmgrd">
  <indexterm>
    <primary>repmgrd</primary>
    <secondary>monitoring</secondary>
  </indexterm>
+ <indexterm>
+   <primary>monitoring</primary>
+   <secondary>with repmgrd</secondary>
+ </indexterm>
 
  <title>Monitoring with repmgrd</title>
  <para>

doc/repmgrd-network-split.sgml

@@ -40,8 +40,8 @@
   In a failover situation, <application>repmgrd</application> will check if any servers in the
   same location as the current primary node are visible.  If not, <application>repmgrd</application>
   will assume a network interruption and not promote any node in any
-  other location (it will however enter <xref linkend="repmgrd-degraded-monitoring"> mode until
-  a primary becomes visible).
+  other location (it will however enter <link linkend="repmgrd-degraded-monitoring">degraded monitoring</link>
+  mode until a primary becomes visible).
  </para>
 
 </chapter>

doc/repmgrd-pausing.sgml

@@ -0,0 +1,169 @@
+<chapter id="repmgrd-pausing" xreflabel="Pausing repmgrd">
+
+  <indexterm>
+    <primary>repmgrd</primary>
+    <secondary>pausing</secondary>
+  </indexterm>
+
+  <indexterm>
+    <primary>pausing repmgrd</primary>
+  </indexterm>
+
+  <title>Pausing repmgrd</title>
+
+  <para>
+    In normal operation, <application>repmgrd</application> monitors the state of the
+    PostgreSQL node it is running on, and will take appropriate action if problems
+    are detected, e.g. (if so configured) promote the node to primary, if the existing
+    primary has been determined as failed.
+  </para>
+
+  <para>
+    However, <application>repmgrd</application> is unable to distinguish between
+    planned outages (such as performing a <link linkend="performing-switchover">switchover</link>
+    or upgrading a server), and an actual server outage. In versions prior to &repmgr; 4.2
+    it was necessary to stop <application>repmgrd</application> on all nodes (or at least
+    on all nodes where <application>repmgrd</application> is
+    <link linkend="repmgrd-automatic-failover">configured for automatic failover</link>)
+    to prevent <application>repmgrd</application> from making changes to the
+    replication cluster.
+  </para>
+  <para>
+    From <link linkend="release-4.2">&repmgr; 4.2</link>, <application>repmgrd</application>
+    can now be &quot;paused&quot;, i.e. instructed not to take any action such as performing a failover.
+    This can be done from any node in the cluster, removing the need to stop/restart
+    each <application>repmgrd</application> individually.
+  </para>
+
+  <sect1 id="repmgrd-pausing-prerequisites">
+    <title>Prerequisites for pausing <application>repmgrd</application></title>
+    <para>
+      In order to be able to pause/unpause <application>repmgrd</application>, following
+      prerequisites must be met:
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara><link linkend="release-4.2">&repmgr; 4.2</link> or later must be installed on all nodes.</simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>The same major &repmgr; version (e.g. 4.2) must be installed on all nodes (and preferably the same minor version).</simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            PostgreSQL on all nodes must be accessible from the node where the
+            <literal>pause</literal>/<literal>unpause</literal> operation is executed, using the
+            <varname>conninfo</varname> string shown by <link linkend="repmgr-cluster-show"><command>repmgr cluster show</command></link>.
+          </simpara>
+        </listitem>
+      </itemizedlist>
+    </para>
+    <note>
+      <para>
+        These conditions are required for normal &repmgr; operation in any case.
+      </para>
+    </note>
+
+  </sect1>
+
+  <sect1 id="repmgrd-pausing-execution">
+    <title>Pausing/unpausing <application>repmgrd</application></title>
+    <para>
+      To pause <application>repmgrd</application>, execute <link linkend="repmgr-daemon-pause"><command>repmgr daemon pause</command></link>, e.g.:
+   <programlisting>
+$ repmgr -f /etc/repmgr.conf daemon pause
+NOTICE: node 1 (node1) paused
+NOTICE: node 2 (node2) paused
+NOTICE: node 3 (node3) paused</programlisting>
+    </para>
+    <para>
+      The state of <application>repmgrd</application> on each node can be checked with
+      <link linkend="repmgr-daemon-status"><command>repmgr daemon status</command></link>, e.g.:
+    <programlisting>$ repmgr -f /etc/repmgr.conf daemon status
+ ID | Name  | Role    | Status  | repmgrd | PID  | Paused?
+----+-------+---------+---------+---------+------+---------
+ 1  | node1 | primary | running | running | 7851 | yes
+ 2  | node2 | standby | running | running | 7889 | yes
+ 3  | node3 | standby | running | running | 7918 | yes</programlisting>
+    </para>
+
+    <note>
+      <para>
+        If executing a switchover with  <link linkend="repmgr-standby-switchover"><command>repmgr standby switchover</command></link>,
+		&repmgr; will automatically pause/unpause <application>repmgrd</application> as part of the switchover process.
+      </para>
+    </note>
+
+    <para>
+      If the primary (in this example, <literal>node1</literal>) is stopped, <application>repmgrd</application>
+      running on one of the standbys (here: <literal>node2</literal>) will react like this:
+      <programlisting>
+[2018-09-20 12:22:21] [WARNING] unable to connect to upstream node "node1" (node ID: 1)
+[2018-09-20 12:22:21] [INFO] checking state of node 1, 1 of 5 attempts
+[2018-09-20 12:22:21] [INFO] sleeping 1 seconds until next reconnection attempt
+...
+[2018-09-20 12:22:24] [INFO] sleeping 1 seconds until next reconnection attempt
+[2018-09-20 12:22:25] [INFO] checking state of node 1, 5 of 5 attempts
+[2018-09-20 12:22:25] [WARNING] unable to reconnect to node 1 after 5 attempts
+[2018-09-20 12:22:25] [NOTICE] node is paused
+[2018-09-20 12:22:33] [INFO] node "node2" (node ID: 2) monitoring upstream node "node1" (node ID: 1) in degraded state
+[2018-09-20 12:22:33] [DETAIL] repmgrd paused by administrator
+[2018-09-20 12:22:33] [HINT] execute "repmgr daemon unpause" to resume normal failover mode</programlisting>
+    </para>
+    <para>
+      If the primary becomes available again (e.g. following a software upgrade), <application>repmgrd</application>
+      will automatically reconnect, e.g.:
+      <programlisting>
+[2018-09-20 13:12:41] [NOTICE] reconnected to upstream node 1 after 8 seconds, resuming monitoring</programlisting>
+    </para>
+
+    <para>
+      To unpause <application>repmgrd</application>, execute <link linkend="repmgr-daemon-unpause"><command>repmgr daemon unpause</command></link>, e.g.:
+   <programlisting>
+$ repmgr -f /etc/repmgr.conf daemon pause
+NOTICE: node 1 (node1) unpaused
+NOTICE: node 2 (node2) unpaused
+NOTICE: node 3 (node3) unpaused</programlisting>
+    </para>
+
+    <note>
+      <para>
+        If the previous primary is no longer accessible when <application>repmgrd</application>
+        is unpaused, no failover action will be taken. Instead, a new primary must be manually promoted using
+        <link linkend="repmgr-standby-promote"><command>repmgr standby promote</command></link>,
+		and any standbys attached to the new primary with
+		<link linkend="repmgr-standby-follow"><command>repmgr standby follow</command></link>.
+      </para>
+      <para>
+        This is to prevent <link linkend="repmgr-daemon-unpause"><command>repmgr daemon unpause</command></link>
+        resulting in the automatic promotion of a new primary, which may be a problem particularly
+        in larger clusters, where <application>repmgrd</application> could select a different promotion
+        candidate to the one intended by the administrator.
+      </para>
+    </note>
+
+  <sect2 id="repmgrd-pausing-details">
+    <title>Details on the <application>repmgrd</application> pausing mechanism</title>
+
+    <para>
+      The pause state of each node will be stored over a PostgreSQL restart.
+    </para>
+
+	<para>
+	  <link linkend="repmgr-daemon-pause"><command>repmgr daemon pause</command></link> and
+	  <link linkend="repmgr-daemon-unpause"><command>repmgr daemon unpause</command></link> can be
+	  executed even if <application>repmgrd</application> is not running; in this case,
+	  <application>repmgrd</application> will start up in whichever pause state has been set.
+	</para>
+    <note>
+      <para>
+		<link linkend="repmgr-daemon-pause"><command>repmgr daemon pause</command></link> and
+		<link linkend="repmgr-daemon-unpause"><command>repmgr daemon unpause</command></link>
+		<emphasis>do not</emphasis> stop/start <application>repmgrd</application>.
+      </para>
+    </note>
+  </sect2>
+  </sect1>
+</chapter>
+

doc/switchover.sgml

@@ -19,9 +19,10 @@
  </para>
  <para>
   <command>repmgr standby switchover</command> differs from other &repmgr;
-  actions in that it also performs actions on another server (the demotion
-  candidate), which means passwordless SSH access is required to that server
-  from the one where <command>repmgr standby switchover</command> is executed.
+  actions in that it also performs actions on other servers (the demotion
+  candidate, and optionally any other servers which are to follow the new primary),
+  which means passwordless SSH access is required to those servers from the one where
+  <command>repmgr standby switchover</command> is executed.
  </para>
  <note>
   <simpara>
@@ -57,7 +58,14 @@
 
    <para>
     As mentioned in the previous section, success of the switchover operation depends on
-    &repmgr;  being able to shut down the current primary server quickly and cleanly.
+    &repmgr; being able to shut down the current primary server quickly and cleanly.
+   </para>
+
+   <para>
+     Ensure that the promotion candidate has sufficient free walsenders available
+     (PostgreSQL configuration item <varname>max_wal_senders</varname>), and if replication
+     slots are in use, at least one free slot is available for the demotion candidate (
+     PostgreSQL configuration item <varname>max_replication_slots</varname>).
    </para>
 
    <para>
@@ -67,13 +75,21 @@
      promotion candidate to all standbys attached to the demotion candidate.
    </para>
 
+   <note>
+     <simpara>
+       &repmgr; expects to find the &repmgr; binary in the same path on the remote
+       server as on the local server.
+     </simpara>
+   </note>
+
    <para>
     Double-check which commands will be used to stop/start/restart the current
-    primary; on the primary execute:
+    primary; on the current primary execute:
     <programlisting>
      repmgr -f /etc/repmgr.conf node service --list --action=stop
      repmgr -f /etc/repmgr.conf node service --list --action=start
      repmgr -f /etc/repmgr.conf node service --list --action=restart</programlisting>
+
    </para>
 
    <para>
@@ -92,7 +108,11 @@
      <para>
        If the <option>service_*_command</option> options aren't defined, &repmgr; will
        fall back to using <application>pg_ctl</application> to stop/start/restart
-       PostgreSQL, which may not work properly.
+       PostgreSQL, which may not work properly, particularly when executed on a remote
+       server.
+     </para>
+     <para>
+       For more details, see <xref linkend="configuration-file-service-commands">.
      </para>
    </important>
 
@@ -110,13 +130,20 @@
    </note>
 
    <para>
-    Check that access from applications is minimalized or preferably blocked
-    completely, so applications are not unexpectedly interrupted.
+     Check that access from applications is minimalized or preferably blocked
+     completely, so applications are not unexpectedly interrupted.
    </para>
 
+   <note>
+     <para>
+       If an exclusive backup is running on the current primary, &repmgr; will not perform the
+       switchover.
+     </para>
+   </note>
+
    <para>
-    Check there is no significant replication lag on standbys attached to the
-    current primary.
+     Check there is no significant replication lag on standbys attached to the
+     current primary.
    </para>
 
    <para>
@@ -127,10 +154,19 @@
     manually with <command>repmgr node check --archive-ready</command>.
    </para>
 
-   <para>
-    Ensure that <application>repmgrd</application> is *not* running anywhere to prevent it unintentionally
-    promoting a node.
-   </para>
+    <note>
+      <para>
+        From <link linkend="release-4.2">repmgr 4.2</link>, &repmgr; will instruct any running
+        <application>repmgrd</application> instances to pause operations while the switchover
+        is being carried out, to prevent <application>repmgrd</application> from
+        unintentionally promoting a node. For more details, see <xref linkend="repmgrd-pausing">.
+      </para>
+      <para>
+        Users of &repmgr; versions prior to 4.2 should ensure that <application>repmgrd</application>
+        is not running on any nodes while a switchover is being executed.
+      </para>
+    </note>
+
 
    <para>
     Finally, consider executing <command>repmgr standby switchover</command> with the
@@ -163,34 +199,60 @@
      </para>
    </important>
 
-   <para>
-     Note that following parameters in <filename>repmgr.conf</filename> are relevant to the
-     switchover operation:
-     <itemizedlist spacing="compact" mark="bullet">
-       <listitem>
-         <simpara>
-           <literal>reconnect_attempts</literal>: number of times to check the original primary
-           for a clean shutdown after executing the shutdown command, before aborting
-         </simpara>
-       </listitem>
-       <listitem>
-         <simpara>
-           <literal>reconnect_interval</literal>: interval (in seconds) to check the original
-           primary for a clean shutdown after executing the shutdown command (up to a maximum
-           of <literal>reconnect_attempts</literal> tries)
-         </simpara>
-       </listitem>
-       <listitem>
-         <simpara>
-           <literal>replication_lag_critical</literal>:
-           if replication lag (in seconds) on the standby exceeds this value, the
-           switchover will be aborted (unless the <literal>-F/--force</literal> option
-           is provided)
-         </simpara>
-       </listitem>
 
-     </itemizedlist>
-   </para>
+   <note>
+     <simpara>
+       See <xref linkend="repmgr-standby-switchover"> for a full list of available
+       command line options and <filename>repmgr.conf</filename> settings relevant
+       to performing a switchover.
+     </simpara>
+   </note>
+
+  <sect2 id="switchover-pg-rewind" xreflabel="Switchover and pg_rewind">
+    <indexterm>
+      <primary>pg_rewind</primary>
+      <secondary>using with "repmgr standby switchover"</secondary>
+    </indexterm>
+    <title>Switchover and pg_rewind</title>
+    <para>
+      If the demotion candidate does not shut down smoothly or cleanly, there's a risk it
+      will have a slightly divergent timeline and will not be able to attach to the new
+      primary. To fix this situation without needing to reclone the old primary, it's
+      possible to use the <application>pg_rewind</application> utility, which will usually be
+      able to resync the two servers.
+    </para>
+    <para>
+      To have &repmgr; execute <application>pg_rewind</application> if it detects this
+      situation after promoting the new primary, add the <option>--force-rewind</option>
+      option.
+    </para>
+    <note>
+      <simpara>
+        If &repmgr; detects a situation where it needs to execute <application>pg_rewind</application>,
+        it will execute a <literal>CHECKPOINT</literal> on the new primary before executing
+        <application>pg_rewind</application>.
+      </simpara>
+    </note>
+    <para>
+      For more details on <application>pg_rewind</application>, see:
+      <ulink url="https://www.postgresql.org/docs/current/static/app-pgrewind.html">https://www.postgresql.org/docs/current/static/app-pgrewind.html</ulink>.
+    </para>
+    <para>
+      <application>pg_rewind</application> has been part of the core PostgreSQL distribution since
+      version 9.5. Users of versions 9.3 and 9.4 will need to manually install it; the source code is available here:
+      <ulink url="https://github.com/vmware/pg_rewind">https://github.com/vmware/pg_rewind</ulink>.
+      If the <application>pg_rewind</application>
+      binary is not installed in the PostgreSQL <filename>bin</filename> directory, provide
+      its full path  on the demotion candidate  with <option>--force-rewind</option>.
+    </para>
+    <para>
+      Note that building the 9.3/9.4 version of <application>pg_rewind</application> requires the PostgreSQL
+      source code. Also, PostgreSQL 9.3 does not provide <varname>wal_log_hints</varname>,
+      meaning data checksums must have been enabled when the database was initialized.
+    </para>
+  </sect2>
+
+
  </sect1>
 
  <sect1 id="switchover-execution" xreflabel="Executing the switchover command">
@@ -248,7 +310,21 @@
      2  | node2 | primary | * running |          | default  | host=node2 dbname=repmgr user=repmgr
    </programlisting>
   </para>
+  <para>
+    If <application>repmgrd</application> is in use, it's worth double-checking that
+    all nodes are unpaused by executing <command><link linkend="repmgr-daemon-status">repmgr-daemon-status</link></command>.
+  </para>
+
+   <note>
+     <para>
+       Users of &repmgr; versions prior to 4.2 will need to manually restart <application>repmgrd</application>
+       on all nodes after the switchover is completed.
+     </para>
+    </note>
+
  </sect1>
+
+
  <sect1 id="switchover-caveats" xreflabel="Caveats">
   <indexterm>
    <primary>switchover</primary>
@@ -274,17 +350,76 @@
       for details.
      </simpara>
     </listitem>
-    <listitem>
-     <simpara>
-      <application>repmgrd</application> should not be running with setting <varname>failover=automatic</varname>
-      in <filename>repmgr.conf</filename> when a switchover is carried out, otherwise the
-      <application>repmgrd</application> daemon may try and promote a standby by itself.
-     </simpara>
-    </listitem>
    </itemizedlist>
   </para>
-  <para>
-   We hope to remove some of these restrictions in future versions of &repmgr;.
-  </para>
  </sect1>
+
+ <sect1 id="switchover-troubleshooting" xreflabel="Troubleshooting">
+   <indexterm>
+     <primary>switchover</primary>
+     <secondary>troubleshooting</secondary>
+   </indexterm>
+   <title>Troubleshooting switchover issues</title>
+
+   <para>
+     As <link linkend="performing-switchover">emphasised previously</link>, performing a switchover
+     is a non-trivial operation and there are a number of potential issues which can occur.
+     While &repmgr; attempts to perform sanity checks, there's no guaranteed way of determining the success of
+     a switchover without actually carrying it out.
+   </para>
+
+   <sect2 id="switchover-troubleshooting-primary-shutdown">
+     <title>Demotion candidate (old primary) does not shut down</title>
+     <para>
+       &repmgr; may abort a switchover with a message like:
+       <programlisting>
+ERROR: shutdown of the primary server could not be confirmed
+HINT: check the primary server status before performing any further actions</programlisting>
+     </para>
+     <para>
+       This means the shutdown of the old primary has taken longer than &repmgr; expected,
+       and it has given up waiting.
+     </para>
+     <para>
+       In this case, check the PostgreSQL log on the primary server to see what is going
+       on. It's entirely possible the shutdown process is just taking longer than the
+       timeout set by the configuration parameter <varname>shutdown_check_timeout</varname>
+       (default: 60 seconds), in which case you may need to adjust this parameter.
+     </para>
+     <note>
+       <para>
+         Note that <varname>shutdown_check_timeout</varname>is set on the node where
+         <command>repmgr standby switchover</command> is executed (promotion candidate); setting it on the
+         demotion candidate (former primary) will have no effect.
+       </para>
+     </note>
+     <para>
+       If the primary server has shut down cleanly, and no other node has been promoted,
+       it is safe to restart it, in which case the replication cluster will be restored
+       to its original configuration.
+     </para>
+   </sect2>
+
+   <sect2 id="switchover-troubleshooting-exclusive-backup">
+     <title>Switchover aborts with an &quot;exclusive backup&quot; error</title>
+     <para>
+       &repmgr; may abort a switchover with a message like:
+       <programlisting>
+ERROR: unable to perform a switchover while primary server is in exclusive backup mode
+HINT: stop backup before attempting the switchover</programlisting>
+     </para>
+     <para>
+       This means an exclusive backup is running on the current primary; interrupting this
+       will not only abort the backup, but potentially leave the primary with an ambiguous
+       backup state.
+     </para>
+     <para>
+       To proceed, either wait until the backup has finished, or cancel it with the command
+       <command>SELECT pg_stop_backup()</command>. For more details see the PostgreSQL
+       documentation section
+       <ulink url="https://www.postgresql.org/docs/current/static/continuous-archiving.html#BACKUP-LOWLEVEL-BASE-BACKUP-EXCLUSIVE">Making an exclusive low level backup</ulink>.
+     </para>
+   </sect2>
+ </sect1>
+
 </chapter>

doc/upgrading-repmgr.sgml

@@ -7,9 +7,9 @@
  <title>Upgrading repmgr</title>
 
  <para>
-  &repmgr; is updated regularly with point releases (e.g. 4.0.1 to 4.0.2)
+  &repmgr; is updated regularly with minor releases (e.g. 4.0.1 to 4.0.2)
   containing bugfixes and other minor improvements. Any substantial new
-  functionality will be included in a feature release (e.g. 4.0.x to 4.1.x).
+  functionality will be included in a major release (e.g. 4.0 to 4.1).
  </para>
 
  <sect1 id="upgrading-repmgr-extension" xreflabel="Upgrading repmgr 4.x and later">
@@ -19,37 +19,201 @@
   </indexterm>
   <title>Upgrading repmgr 4.x and later</title>
   <para>
-    &repmgr; 4.x is implemented as a PostgreSQL extension; normally the upgrade consists
-    of the two following steps:
-    <orderedlist>
-      <listitem>
-        <simpara>
-          Install the updated package (or compile the updated source)
-        </simpara>
-      </listitem>
-      <listitem>
-        <simpara>
-          In the database where the &repmgr; extension is installed, execute
-          <command>ALTER EXTENSION repmgr UPDATE</command>.
-        </simpara>
-      </listitem>
-    </orderedlist>
+    From version 4, &repmgr; consists of three elements:
+     <itemizedlist spacing="compact" mark="bullet">
+
+       <listitem>
+         <simpara>
+           the <application>repmgr</application> and <application>repmgrd</application> executables
+         </simpara>
+       </listitem>
+
+       <listitem>
+         <simpara>
+           the objects for the &repmgr; PostgreSQL extension (SQL files for creating/updating
+           repmgr metadata, and the extension control file)
+         </simpara>
+       </listitem>
+
+       <listitem>
+         <simpara>
+           the shared library module used by <application>repmgrd</application> which
+           is resident in the PostgreSQL backend
+         </simpara>
+       </listitem>
+     </itemizedlist>
+  </para>
+  <para>
+    With <emphasis>minor releases</emphasis>, usually changes are only made to the <application>repmgr</application>
+    and <application>repmgrd</application> executables. In this case, the upgrade is quite straightforward,
+    and is simply a case of installing the new version, and restarting <application>repmgrd</application>
+    (if running).
   </para>
 
   <para>
-    Always check the <link linkend="appendix-release-notes">release notes</link> for every
-    release as they may contain upgrade instructions particular to individual versions.
+    For <emphasis>major releases</emphasis>, the &repmgr; PostgreSQL extension will need to be updated
+    to the latest version. Additionally, if the shared library module has been updated (this is sometimes,
+    but not always the case), PostgreSQL itself will need to be restarted on each node.
   </para>
+  <important>
+    <para>
+      Always check the <link linkend="appendix-release-notes">release notes</link> for every
+      release as they may contain upgrade instructions particular to individual versions.
+    </para>
+  </important>
 
-  <para>
-    If the <application>repmgrd</application> daemon is in use, we recommend stopping it
-    before upgrading &repmgr;.
-  </para>
-  <para>
-    Note that it may be necessary to restart the PostgreSQL server if the upgrade contains
-    changes to the shared object file used by <application>repmgrd</application>; check the
-    release notes for details.
-  </para>
+  <sect2 id="upgrading-minor-version" xreflabel="Upgrading a minor version release">
+	<indexterm>
+	  <primary>upgrading</primary>
+	  <secondary>minor release</secondary>
+	</indexterm>
+	<title>Upgrading a minor version release</title>
+
+    <para>
+      The process for installing minor version upgrades is quite straightforward:
+
+      <itemizedlist spacing="compact" mark="bullet">
+
+        <listitem>
+          <simpara>
+            install the new &repmgr; version
+          </simpara>
+        </listitem>
+
+        <listitem>
+          <simpara>
+            restart <application>repmgrd</application> on all nodes where it is running
+          </simpara>
+        </listitem>
+
+      </itemizedlist>
+
+    </para>
+
+    <note>
+	  <para>
+        Some packaging systems (e.g. <link linkend="packages-debian-ubuntu">Debian/Ubuntu</link>
+        may restart <application>repmgrd</application> as part of the package upgrade process.
+      </para>
+    </note>
+
+	<para>
+	  Minor version upgrades can be performed in any order on the nodes in the replication
+	  cluster.
+	</para>
+
+	<para>
+	  A PostgreSQL restart is <emphasis>not</emphasis> required for minor version upgrades.
+	</para>
+
+    <note>
+	  <para>
+	    The same &repmgr; &quot;major version&quot; (e.g. <literal>4.2</literal>) must be
+	    installed on all nodes in the replication cluster. While it's possible to have differing
+	    &repmgr; &quot;minor versions&quot; (e.g. <literal>4.2.1</literal>)  on different nodes,
+	    we strongly recommend updating all nodes to the latest minor version.
+	  </para>
+    </note>
+
+  </sect2>
+
+  <sect2 id="upgrading-major-version" xreflabel="Upgrading a major version release">
+	<indexterm>
+	  <primary>upgrading</primary>
+	  <secondary>major release</secondary>
+	</indexterm>
+	<title>Upgrading a major version release</title>
+	<para>
+	  &quot;major version&quot; upgrades need to be planned more carefully, as they may include
+	  changes to the &repmgr; metadata (which need to be propagated from the primary to all
+	  standbys) and/or changes to the shared object file used by <application>repmgrd</application>
+	  (which require a PostgreSQL restart).
+	</para>
+	<para>
+	  With this in mind,
+	</para>
+
+	<para>
+      <orderedlist>
+
+		<listitem>
+          <simpara>
+			Stop <application>repmgrd</application> (if in use) on all nodes where it is running.
+          </simpara>
+		</listitem>
+
+		<listitem>
+          <simpara>
+			Disable the <application>repmgrd</application> service on all nodes where it is in use;
+            this is to prevent packages from prematurely restarting <application>repmgrd</application>.
+          </simpara>
+		</listitem>
+
+		<listitem>
+          <simpara>
+			Install the updated package (or compile the updated source) on all nodes.
+          </simpara>
+		</listitem>
+
+        <listitem>
+          <para>
+            If running a <literal>systemd</literal>-based Linux distribution, execute (as <literal>root</literal>,
+            or with appropriate <literal>sudo</literal> permissions):
+            <programlisting>
+systemctl daemon-reload</programlisting>
+          </para>
+        </listitem>
+
+		<listitem>
+          <simpara>
+			If the &repmgr; shared library module has been updated (check the <link linkend="appendix-release-notes">release notes</link>!),
+            restart PostgreSQL, then <application>repmgrd</application> (if in use)	on each node,
+            The order in which this is applied to individual nodes is not critical,
+			and it's also fine to restart PostgreSQL on all nodes first before starting <application>repmgrd</application>.
+		  </simpara>
+		  <simpara>
+			Note that if the upgrade requires a PostgreSQL restart, <application>repmgrd</application>
+			will only function correctly once all nodes have been restarted.
+          </simpara>
+		</listitem>
+
+		<listitem>
+          <para>
+			On the primary node, execute
+			<programlisting>
+ALTER EXTENSION repmgr UPDATE</programlisting>
+			in the database where &repmgr; is installed.
+          </para>
+		</listitem>
+
+		<listitem>
+          <simpara>
+			Reenable the <application>repmgrd</application> service on all nodes where it is in use.
+          </simpara>
+		</listitem>
+
+	  </orderedlist>
+	</para>
+	<tip>
+	  <para>
+		If the &repmgr; upgrade requires a PostgreSQL restart, combine the &repmgr; upgrade
+		with a PostgreSQL minor version upgrade, which will require a restart in any case.
+		New PostgreSQL minor version are usually released every couple of months.
+	  </para>
+	</tip>
+  </sect2>
+
+  <sect2 id="upgrading-check-repmgrd" xreflabel="Checking repmgrd status after an upgrade">
+	<indexterm>
+	  <primary>upgrading</primary>
+	  <secondary>checking repmgrd status</secondary>
+	</indexterm>
+	<title>Checking repmgrd status after an upgrade</title>
+	<para>
+      From &repmgr; 4.2, once the upgrade is complete, execute the <command><link linkend="repmgr-daemon-status">repmgr daemon status</link></command>
+      command (on any node) to show an overview of the status of <application>repmgrd</application> on all nodes.
+    </para>
+  </sect2>
  </sect1>
 
  <sect1 id="upgrading-and-pg-upgrade" xreflabel="pg_upgrade and repmgr">
@@ -89,6 +253,13 @@
     be recreated by <application>pg_upgrade</application>. These will need to
     be recreated manually.
   </para>
+  <tip>
+	<para>
+	  Use <command><link linkend="repmgr-node-check">repmgr node check</link></command>
+	  to determine which replacation slots need to be recreated.
+	</para>
+  </tip>
+
  </sect1>
 
 

doc/version.sgml

@@ -1 +1 @@
-<!ENTITY repmgrversion "4.0.4">
+<!ENTITY repmgrversion "4.2">

errcode.h

@@ -44,5 +44,9 @@
 #define ERR_REGISTRATION_SYNC 20
 #define ERR_OUT_OF_MEMORY 21
 #define ERR_SWITCHOVER_INCOMPLETE 22
+#define ERR_FOLLOW_FAIL 23
+#define ERR_REJOIN_FAIL 24
+#define ERR_NODE_STATUS 25
+#define ERR_REPMGRD_PAUSE 26
 
 #endif							/* _ERRCODE_H_ */

log.c

@@ -42,7 +42,7 @@ _stderr_log_with_level(const char *level_name, int level, const char *fmt, va_li
 __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 0)));
 
 int			log_type = REPMGR_STDERR;
-int			log_level = LOG_NOTICE;
+int			log_level = LOG_INFO;
 int			last_log_level = LOG_INFO;
 int			verbose_logging = false;
 int			terse_logging = false;
@@ -70,7 +70,7 @@ _stderr_log_with_level(const char *level_name, int level, const char *fmt, va_li
 
 	/*
 	 * Store the requested level so that if there's a subsequent log_hint() or
-	 * log_detail(), we can suppress that if appropriate.
+	 * log_detail(), we can suppress that if --terse was specified,
 	 */
 	last_log_level = level;
 
@@ -329,6 +329,21 @@ logger_set_terse(void)
 }
 
 
+void
+logger_set_level(int new_log_level)
+{
+	log_level = new_log_level;
+}
+
+
+void
+logger_set_min_level(int min_log_level)
+{
+	if (min_log_level > log_level)
+		log_level = min_log_level;
+}
+
+
 int
 detect_log_level(const char *level)
 {

log.h

@@ -128,6 +128,8 @@ bool		logger_shutdown(void);
 
 void		logger_set_verbose(void);
 void		logger_set_terse(void);
+void		logger_set_min_level(int min_log_level);
+void		logger_set_level(int new_log_level);
 
 void
 log_detail(const char *fmt,...)

repmgr--4.0--4.1.sql

@@ -0,0 +1,2 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION repmgr" to load this file. \quit

repmgr--4.1--4.2.sql

@@ -0,0 +1,32 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION repmgr" to load this file. \quit
+
+CREATE FUNCTION get_repmgrd_pid()
+  RETURNS INT
+  AS 'MODULE_PATHNAME', 'get_repmgrd_pid'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_repmgrd_pidfile()
+  RETURNS TEXT
+  AS 'MODULE_PATHNAME', 'get_repmgrd_pidfile'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION set_repmgrd_pid(INT, TEXT)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'set_repmgrd_pid'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION repmgrd_is_running()
+  RETURNS BOOL
+  AS 'MODULE_PATHNAME', 'repmgrd_is_running'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION repmgrd_pause(BOOL)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'repmgrd_pause'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION repmgrd_is_paused()
+  RETURNS BOOL
+  AS 'MODULE_PATHNAME', 'repmgrd_is_paused'
+  LANGUAGE C STRICT;

repmgr--4.1.sql

@@ -0,0 +1,166 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION repmgr" to load this file. \quit
+
+CREATE TABLE repmgr.nodes (
+  node_id          INTEGER     PRIMARY KEY,
+  upstream_node_id INTEGER     NULL REFERENCES nodes (node_id) DEFERRABLE,
+  active           BOOLEAN     NOT NULL DEFAULT TRUE,
+  node_name        TEXT        NOT NULL,
+  type             TEXT        NOT NULL CHECK (type IN('primary','standby','witness','bdr')),
+  location         TEXT        NOT NULL DEFAULT 'default',
+  priority         INT         NOT NULL DEFAULT 100,
+  conninfo         TEXT        NOT NULL,
+  repluser         VARCHAR(63) NOT NULL,
+  slot_name        TEXT        NULL,
+  config_file      TEXT        NOT NULL
+);
+
+CREATE TABLE repmgr.events (
+  node_id          INTEGER NOT NULL,
+  event            TEXT NOT NULL,
+  successful       BOOLEAN NOT NULL DEFAULT TRUE,
+  event_timestamp  TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  details          TEXT NULL
+);
+
+DO $repmgr$
+DECLARE
+  DECLARE server_version_num INT;
+BEGIN
+  SELECT setting
+    FROM pg_catalog.pg_settings
+   WHERE name = 'server_version_num'
+    INTO server_version_num;
+  IF server_version_num >= 90400 THEN
+    EXECUTE $repmgr_func$
+CREATE TABLE repmgr.monitoring_history (
+  primary_node_id                INTEGER NOT NULL,
+  standby_node_id                INTEGER NOT NULL,
+  last_monitor_time              TIMESTAMP WITH TIME ZONE NOT NULL,
+  last_apply_time                TIMESTAMP WITH TIME ZONE,
+  last_wal_primary_location      PG_LSN NOT NULL,
+  last_wal_standby_location      PG_LSN,
+  replication_lag                BIGINT NOT NULL,
+  apply_lag                      BIGINT NOT NULL
+)
+    $repmgr_func$;
+  ELSE
+    EXECUTE $repmgr_func$
+CREATE TABLE repmgr.monitoring_history (
+  primary_node_id                INTEGER NOT NULL,
+  standby_node_id                INTEGER NOT NULL,
+  last_monitor_time              TIMESTAMP WITH TIME ZONE NOT NULL,
+  last_apply_time                TIMESTAMP WITH TIME ZONE,
+  last_wal_primary_location      TEXT NOT NULL,
+  last_wal_standby_location      TEXT,
+  replication_lag                BIGINT NOT NULL,
+  apply_lag                      BIGINT NOT NULL
+)
+    $repmgr_func$;
+  END IF;
+END$repmgr$;
+
+
+
+CREATE INDEX idx_monitoring_history_time
+          ON repmgr.monitoring_history (last_monitor_time, standby_node_id);
+
+CREATE VIEW repmgr.show_nodes AS
+   SELECT n.node_id,
+          n.node_name,
+          n.active,
+          n.upstream_node_id,
+          un.node_name AS upstream_node_name,
+          n.type,
+          n.priority,
+          n.conninfo
+     FROM repmgr.nodes n
+LEFT JOIN repmgr.nodes un
+       ON un.node_id = n.upstream_node_id;
+
+
+/* XXX update upgrade scripts! */
+CREATE TABLE repmgr.voting_term (
+  term INT NOT NULL
+);
+
+CREATE UNIQUE INDEX voting_term_restrict
+ON repmgr.voting_term ((TRUE));
+
+CREATE RULE voting_term_delete AS
+   ON DELETE TO repmgr.voting_term
+   DO INSTEAD NOTHING;
+
+
+/* ================= */
+/* repmgrd functions */
+/* ================= */
+
+/* monitoring functions */
+
+CREATE FUNCTION set_local_node_id(INT)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'set_local_node_id'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_local_node_id()
+  RETURNS INT
+  AS 'MODULE_PATHNAME', 'get_local_node_id'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION standby_set_last_updated()
+  RETURNS TIMESTAMP WITH TIME ZONE
+  AS 'MODULE_PATHNAME', 'standby_set_last_updated'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION standby_get_last_updated()
+  RETURNS TIMESTAMP WITH TIME ZONE
+  AS 'MODULE_PATHNAME', 'standby_get_last_updated'
+  LANGUAGE C STRICT;
+
+/* failover functions */
+
+CREATE FUNCTION notify_follow_primary(INT)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'notify_follow_primary'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_new_primary()
+  RETURNS INT
+  AS 'MODULE_PATHNAME', 'get_new_primary'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION reset_voting_status()
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'reset_voting_status'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION am_bdr_failover_handler(INT)
+  RETURNS BOOL
+  AS 'MODULE_PATHNAME', 'am_bdr_failover_handler'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION unset_bdr_failover_handler()
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'unset_bdr_failover_handler'
+  LANGUAGE C STRICT;
+
+CREATE VIEW repmgr.replication_status AS
+  SELECT m.primary_node_id, m.standby_node_id, n.node_name AS standby_name,
+ 	     n.type AS node_type, n.active, last_monitor_time,
+         CASE WHEN n.type='standby' THEN m.last_wal_primary_location ELSE NULL END AS last_wal_primary_location,
+         m.last_wal_standby_location,
+         CASE WHEN n.type='standby' THEN pg_catalog.pg_size_pretty(m.replication_lag) ELSE NULL END AS replication_lag,
+         CASE WHEN n.type='standby' THEN
+           CASE WHEN replication_lag > 0 THEN age(now(), m.last_apply_time) ELSE '0'::INTERVAL END
+           ELSE NULL
+         END AS replication_time_lag,
+         CASE WHEN n.type='standby' THEN pg_catalog.pg_size_pretty(m.apply_lag) ELSE NULL END AS apply_lag,
+         AGE(NOW(), CASE WHEN pg_catalog.pg_is_in_recovery() THEN repmgr.standby_get_last_updated() ELSE m.last_monitor_time END) AS communication_time_lag
+    FROM repmgr.monitoring_history m
+    JOIN repmgr.nodes n ON m.standby_node_id = n.node_id
+   WHERE (m.standby_node_id, m.last_monitor_time) IN (
+	          SELECT m1.standby_node_id, MAX(m1.last_monitor_time)
+			    FROM repmgr.monitoring_history m1 GROUP BY 1
+         );
+

repmgr--4.2.sql

@@ -0,0 +1,197 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION repmgr" to load this file. \quit
+
+CREATE TABLE repmgr.nodes (
+  node_id          INTEGER     PRIMARY KEY,
+  upstream_node_id INTEGER     NULL REFERENCES nodes (node_id) DEFERRABLE,
+  active           BOOLEAN     NOT NULL DEFAULT TRUE,
+  node_name        TEXT        NOT NULL,
+  type             TEXT        NOT NULL CHECK (type IN('primary','standby','witness','bdr')),
+  location         TEXT        NOT NULL DEFAULT 'default',
+  priority         INT         NOT NULL DEFAULT 100,
+  conninfo         TEXT        NOT NULL,
+  repluser         VARCHAR(63) NOT NULL,
+  slot_name        TEXT        NULL,
+  config_file      TEXT        NOT NULL
+);
+
+CREATE TABLE repmgr.events (
+  node_id          INTEGER NOT NULL,
+  event            TEXT NOT NULL,
+  successful       BOOLEAN NOT NULL DEFAULT TRUE,
+  event_timestamp  TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  details          TEXT NULL
+);
+
+DO $repmgr$
+DECLARE
+  DECLARE server_version_num INT;
+BEGIN
+  SELECT setting
+    FROM pg_catalog.pg_settings
+   WHERE name = 'server_version_num'
+    INTO server_version_num;
+  IF server_version_num >= 90400 THEN
+    EXECUTE $repmgr_func$
+CREATE TABLE repmgr.monitoring_history (
+  primary_node_id                INTEGER NOT NULL,
+  standby_node_id                INTEGER NOT NULL,
+  last_monitor_time              TIMESTAMP WITH TIME ZONE NOT NULL,
+  last_apply_time                TIMESTAMP WITH TIME ZONE,
+  last_wal_primary_location      PG_LSN NOT NULL,
+  last_wal_standby_location      PG_LSN,
+  replication_lag                BIGINT NOT NULL,
+  apply_lag                      BIGINT NOT NULL
+)
+    $repmgr_func$;
+  ELSE
+    EXECUTE $repmgr_func$
+CREATE TABLE repmgr.monitoring_history (
+  primary_node_id                INTEGER NOT NULL,
+  standby_node_id                INTEGER NOT NULL,
+  last_monitor_time              TIMESTAMP WITH TIME ZONE NOT NULL,
+  last_apply_time                TIMESTAMP WITH TIME ZONE,
+  last_wal_primary_location      TEXT NOT NULL,
+  last_wal_standby_location      TEXT,
+  replication_lag                BIGINT NOT NULL,
+  apply_lag                      BIGINT NOT NULL
+)
+    $repmgr_func$;
+  END IF;
+END$repmgr$;
+
+
+
+CREATE INDEX idx_monitoring_history_time
+          ON repmgr.monitoring_history (last_monitor_time, standby_node_id);
+
+CREATE VIEW repmgr.show_nodes AS
+   SELECT n.node_id,
+          n.node_name,
+          n.active,
+          n.upstream_node_id,
+          un.node_name AS upstream_node_name,
+          n.type,
+          n.priority,
+          n.conninfo
+     FROM repmgr.nodes n
+LEFT JOIN repmgr.nodes un
+       ON un.node_id = n.upstream_node_id;
+
+
+/* XXX update upgrade scripts! */
+CREATE TABLE repmgr.voting_term (
+  term INT NOT NULL
+);
+
+CREATE UNIQUE INDEX voting_term_restrict
+ON repmgr.voting_term ((TRUE));
+
+CREATE RULE voting_term_delete AS
+   ON DELETE TO repmgr.voting_term
+   DO INSTEAD NOTHING;
+
+
+/* ================= */
+/* repmgrd functions */
+/* ================= */
+
+/* monitoring functions */
+
+CREATE FUNCTION set_local_node_id(INT)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'set_local_node_id'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_local_node_id()
+  RETURNS INT
+  AS 'MODULE_PATHNAME', 'get_local_node_id'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION standby_set_last_updated()
+  RETURNS TIMESTAMP WITH TIME ZONE
+  AS 'MODULE_PATHNAME', 'standby_set_last_updated'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION standby_get_last_updated()
+  RETURNS TIMESTAMP WITH TIME ZONE
+  AS 'MODULE_PATHNAME', 'standby_get_last_updated'
+  LANGUAGE C STRICT;
+
+/* failover functions */
+
+CREATE FUNCTION notify_follow_primary(INT)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'notify_follow_primary'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_new_primary()
+  RETURNS INT
+  AS 'MODULE_PATHNAME', 'get_new_primary'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION reset_voting_status()
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'reset_voting_status'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION am_bdr_failover_handler(INT)
+  RETURNS BOOL
+  AS 'MODULE_PATHNAME', 'am_bdr_failover_handler'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION unset_bdr_failover_handler()
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'unset_bdr_failover_handler'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_repmgrd_pid()
+  RETURNS INT
+  AS 'MODULE_PATHNAME', 'get_repmgrd_pid'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION get_repmgrd_pidfile()
+  RETURNS TEXT
+  AS 'MODULE_PATHNAME', 'get_repmgrd_pidfile'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION set_repmgrd_pid(INT, TEXT)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'set_repmgrd_pid'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION repmgrd_is_running()
+  RETURNS BOOL
+  AS 'MODULE_PATHNAME', 'repmgrd_is_running'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION repmgrd_pause(BOOL)
+  RETURNS VOID
+  AS 'MODULE_PATHNAME', 'repmgrd_pause'
+  LANGUAGE C STRICT;
+
+CREATE FUNCTION repmgrd_is_paused()
+  RETURNS BOOL
+  AS 'MODULE_PATHNAME', 'repmgrd_is_paused'
+  LANGUAGE C STRICT;
+
+
+CREATE VIEW repmgr.replication_status AS
+  SELECT m.primary_node_id, m.standby_node_id, n.node_name AS standby_name,
+ 	     n.type AS node_type, n.active, last_monitor_time,
+         CASE WHEN n.type='standby' THEN m.last_wal_primary_location ELSE NULL END AS last_wal_primary_location,
+         m.last_wal_standby_location,
+         CASE WHEN n.type='standby' THEN pg_catalog.pg_size_pretty(m.replication_lag) ELSE NULL END AS replication_lag,
+         CASE WHEN n.type='standby' THEN
+           CASE WHEN replication_lag > 0 THEN age(now(), m.last_apply_time) ELSE '0'::INTERVAL END
+           ELSE NULL
+         END AS replication_time_lag,
+         CASE WHEN n.type='standby' THEN pg_catalog.pg_size_pretty(m.apply_lag) ELSE NULL END AS apply_lag,
+         AGE(NOW(), CASE WHEN pg_catalog.pg_is_in_recovery() THEN repmgr.standby_get_last_updated() ELSE m.last_monitor_time END) AS communication_time_lag
+    FROM repmgr.monitoring_history m
+    JOIN repmgr.nodes n ON m.standby_node_id = n.node_id
+   WHERE (m.standby_node_id, m.last_monitor_time) IN (
+	          SELECT m1.standby_node_id, MAX(m1.last_monitor_time)
+			    FROM repmgr.monitoring_history m1 GROUP BY 1
+         );
+

repmgr-action-bdr.c

@@ -83,9 +83,10 @@ do_bdr_register(void)
 		exit(ERR_BAD_CONFIG);
 	}
 
-	if (bdr_nodes.node_count > 2)
+	/* BDR 2 implementation is for 2 nodes only */
+	if (get_bdr_version_num() < 3 && bdr_nodes.node_count > 2)
 	{
-		log_error(_("repmgr can only support BDR clusters with 2 nodes"));
+		log_error(_("repmgr can only support BDR 2.x clusters with 2 nodes"));
 		log_detail(_("this BDR cluster has %i nodes"), bdr_nodes.node_count);
 		PQfinish(conn);
 		pfree(dbname);
@@ -176,6 +177,7 @@ do_bdr_register(void)
 
 	if (bdr_node_has_repmgr_set(conn, config_file_options.node_name) == false)
 	{
+		log_debug("bdr_node_has_repmgr_set() = false");
 		bdr_node_set_repmgr_set(conn, config_file_options.node_name);
 	}
 
@@ -189,7 +191,7 @@ do_bdr_register(void)
 	{
 		NodeInfoList local_node_records = T_NODE_INFO_LIST_INITIALIZER;
 
-		get_all_node_records(conn, &local_node_records);
+		(void) get_all_node_records(conn, &local_node_records);
 
 		if (local_node_records.node_count == 0)
 		{
@@ -201,6 +203,7 @@ do_bdr_register(void)
 			if (bdr_nodes.node_count == 0)
 			{
 				log_error(_("unable to retrieve any BDR node records"));
+				log_detail("%s", PQerrorMessage(conn));
 				PQfinish(conn);
 				exit(ERR_BAD_CONFIG);
 			}
@@ -236,7 +239,7 @@ do_bdr_register(void)
 					continue;
 				}
 
-				get_all_node_records(bdr_node_conn, &existing_nodes);
+				(void) get_all_node_records(bdr_node_conn, &existing_nodes);
 
 				for (cell = existing_nodes.head; cell; cell = cell->next)
 				{
@@ -252,7 +255,35 @@ do_bdr_register(void)
 	}
 
 	/* Add the repmgr extension tables to a replication set */
-	add_extension_tables_to_bdr_replication_set(conn);
+
+	if (get_bdr_version_num() < 3)
+	{
+		add_extension_tables_to_bdr_replication_set(conn);
+	}
+	else
+	{
+		/* this is the only table we need to replicate */
+		char *replication_set = get_default_bdr_replication_set(conn);
+
+		/*
+		 * this probably won't happen, but we need to be sure we're using
+		 * the replication set metadata correctly...
+		 */
+		if (conn == NULL)
+		{
+			log_error(_("unable to retrieve default BDR replication set"));
+			log_hint(_("see preceding messages"));
+			log_debug("check query in get_default_bdr_replication_set()");
+			exit(ERR_BAD_CONFIG);
+		}
+
+		if (is_table_in_bdr_replication_set(conn, "nodes", replication_set) == false)
+		{
+			add_table_to_bdr_replication_set(conn, "nodes", replication_set);
+		}
+
+		pfree(replication_set);
+	}
 
 	initPQExpBuffer(&event_details);
 

repmgr-action-cluster.c

@@ -26,7 +26,6 @@
 
 #define SHOW_HEADER_COUNT 7
 
-
 typedef enum
 {
 	SHOW_ID = 0,
@@ -51,21 +50,13 @@ typedef enum
 }			EventHeader;
 
 
-
-struct ColHeader
-{
-	char		title[MAXLEN];
-	int			max_length;
-	int			cur_length;
-};
-
 struct ColHeader headers_show[SHOW_HEADER_COUNT];
 struct ColHeader headers_event[EVENT_HEADER_COUNT];
 
 
 
-static int	build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length);
-static int	build_cluster_crosscheck(t_node_status_cube ***cube_dest, int *name_length);
+static int	build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length, ItemList *warnings, int *error_code);
+static int	build_cluster_crosscheck(t_node_status_cube ***cube_dest, int *name_length, ItemList *warnings, int *error_code);
 static void cube_set_node_status(t_node_status_cube **cube, int n, int node_id, int matrix_node_id, int connection_node_id, int connection_status);
 
 /*
@@ -83,6 +74,8 @@ do_cluster_show(void)
 	int			i = 0;
 	ItemList	warnings = {NULL, NULL};
 	bool		success = false;
+	bool		error_found = false;
+	bool		connection_error_found = false;
 
 	/* Connect to local database to obtain cluster connection data */
 	log_verbose(LOG_INFO, _("connecting to database"));
@@ -140,14 +133,26 @@ do_cluster_show(void)
 		}
 		else
 		{
-			char		error[MAXLEN];
-
-			strncpy(error, PQerrorMessage(cell->node_info->conn), MAXLEN);
 			cell->node_info->node_status = NODE_STATUS_DOWN;
 			cell->node_info->recovery_type = RECTYPE_UNKNOWN;
-			item_list_append_format(&warnings,
-									"when attempting to connect to node \"%s\" (ID: %i), following error encountered :\n\"%s\"",
-									cell->node_info->node_name, cell->node_info->node_id, trim(error));
+
+			connection_error_found = true;
+
+			if (runtime_options.verbose)
+			{
+				char		error[MAXLEN];
+
+				strncpy(error, PQerrorMessage(cell->node_info->conn), MAXLEN);
+				item_list_append_format(&warnings,
+										"when attempting to connect to node \"%s\" (ID: %i), following error encountered :\n\"%s\"",
+										cell->node_info->node_name, cell->node_info->node_id, trim(error));
+			}
+			else
+			{
+				item_list_append_format(&warnings,
+										"unable to connect to node \"%s\" (ID: %i)",
+										cell->node_info->node_name, cell->node_info->node_id);
+			}
 		}
 
 		initPQExpBuffer(&details);
@@ -169,16 +174,16 @@ do_cluster_show(void)
 							switch (cell->node_info->recovery_type)
 							{
 								case RECTYPE_PRIMARY:
-									appendPQExpBuffer(&details, "* running");
+									appendPQExpBufferStr(&details, "* running");
 									break;
 								case RECTYPE_STANDBY:
-									appendPQExpBuffer(&details, "! running as standby");
+									appendPQExpBufferStr(&details, "! running as standby");
 									item_list_append_format(&warnings,
 															"node \"%s\" (ID: %i) is registered as primary but running as standby",
 															cell->node_info->node_name, cell->node_info->node_id);
 									break;
 								case RECTYPE_UNKNOWN:
-									appendPQExpBuffer(&details, "! unknown");
+									appendPQExpBufferStr(&details, "! unknown");
 									item_list_append_format(&warnings,
 															"node \"%s\" (ID: %i) has unknown replication status",
 															cell->node_info->node_name, cell->node_info->node_id);
@@ -189,14 +194,14 @@ do_cluster_show(void)
 						{
 							if (cell->node_info->recovery_type == RECTYPE_PRIMARY)
 							{
-								appendPQExpBuffer(&details, "! running");
+								appendPQExpBufferStr(&details, "! running");
 								item_list_append_format(&warnings,
 														"node \"%s\" (ID: %i) is running but the repmgr node record is inactive",
 														cell->node_info->node_name, cell->node_info->node_id);
 							}
 							else
 							{
-								appendPQExpBuffer(&details, "! running as standby");
+								appendPQExpBufferStr(&details, "! running as standby");
 								item_list_append_format(&warnings,
 														"node \"%s\" (ID: %i) is registered as an inactive primary but running as standby",
 														cell->node_info->node_name, cell->node_info->node_id);
@@ -209,7 +214,7 @@ do_cluster_show(void)
 						/* node is unreachable but marked active */
 						if (cell->node_info->active == true)
 						{
-							appendPQExpBuffer(&details, "? unreachable");
+							appendPQExpBufferStr(&details, "? unreachable");
 							item_list_append_format(&warnings,
 													"node \"%s\" (ID: %i) is registered as an active primary but is unreachable",
 													cell->node_info->node_name, cell->node_info->node_id);
@@ -217,7 +222,8 @@ do_cluster_show(void)
 						/* node is unreachable and marked as inactive */
 						else
 						{
-							appendPQExpBuffer(&details, "- failed");
+							appendPQExpBufferStr(&details, "- failed");
+							error_found = true;
 						}
 					}
 				}
@@ -232,16 +238,16 @@ do_cluster_show(void)
 							switch (cell->node_info->recovery_type)
 							{
 								case RECTYPE_STANDBY:
-									appendPQExpBuffer(&details, "  running");
+									appendPQExpBufferStr(&details, "  running");
 									break;
 								case RECTYPE_PRIMARY:
-									appendPQExpBuffer(&details, "! running as primary");
+									appendPQExpBufferStr(&details, "! running as primary");
 									item_list_append_format(&warnings,
 															"node \"%s\" (ID: %i) is registered as standby but running as primary",
 															cell->node_info->node_name, cell->node_info->node_id);
 									break;
 								case RECTYPE_UNKNOWN:
-									appendPQExpBuffer(&details, "! unknown");
+									appendPQExpBufferStr(&details, "! unknown");
 									item_list_append_format(
 															&warnings,
 															"node \"%s\" (ID: %i) has unknown replication status",
@@ -253,14 +259,14 @@ do_cluster_show(void)
 						{
 							if (cell->node_info->recovery_type == RECTYPE_STANDBY)
 							{
-								appendPQExpBuffer(&details, "! running");
+								appendPQExpBufferStr(&details, "! running");
 								item_list_append_format(&warnings,
 														"node \"%s\" (ID: %i) is running but the repmgr node record is inactive",
 														cell->node_info->node_name, cell->node_info->node_id);
 							}
 							else
 							{
-								appendPQExpBuffer(&details, "! running as primary");
+								appendPQExpBufferStr(&details, "! running as primary");
 								item_list_append_format(&warnings,
 														"node \"%s\" (ID: %i) is running as primary but the repmgr node record is inactive",
 														cell->node_info->node_name, cell->node_info->node_id);
@@ -273,14 +279,15 @@ do_cluster_show(void)
 						/* node is unreachable but marked active */
 						if (cell->node_info->active == true)
 						{
-							appendPQExpBuffer(&details, "? unreachable");
+							appendPQExpBufferStr(&details, "? unreachable");
 							item_list_append_format(&warnings,
 													"node \"%s\" (ID: %i) is registered as an active standby but is unreachable",
 													cell->node_info->node_name, cell->node_info->node_id);
 						}
 						else
 						{
-							appendPQExpBuffer(&details, "- failed");
+							appendPQExpBufferStr(&details, "- failed");
+							error_found = true;
 						}
 					}
 				}
@@ -292,24 +299,35 @@ do_cluster_show(void)
 					if (cell->node_info->node_status == NODE_STATUS_UP)
 					{
 						if (cell->node_info->active == true)
-							appendPQExpBuffer(&details, "* running");
+						{
+							appendPQExpBufferStr(&details, "* running");
+						}
 						else
-							appendPQExpBuffer(&details, "! running");
+						{
+							appendPQExpBufferStr(&details, "! running");
+							error_found = true;
+						}
 					}
 					/* node is unreachable */
 					else
 					{
 						if (cell->node_info->active == true)
-							appendPQExpBuffer(&details, "? unreachable");
+						{
+							appendPQExpBufferStr(&details, "? unreachable");
+						}
 						else
-							appendPQExpBuffer(&details, "- failed");
+						{
+							appendPQExpBufferStr(&details, "- failed");
+							error_found = true;
+						}
 					}
 				}
 				break;
 			case UNKNOWN:
 				{
 					/* this should never happen */
-					appendPQExpBuffer(&details, "? unknown node type");
+					appendPQExpBufferStr(&details, "? unknown node type");
+						error_found = true;
 				}
 				break;
 		}
@@ -337,36 +355,10 @@ do_cluster_show(void)
 
 	}
 
+	/* Print column header row (text mode only) */
 	if (runtime_options.output_mode == OM_TEXT)
 	{
-		for (i = 0; i < SHOW_HEADER_COUNT; i++)
-		{
-			if (i == 0)
-				printf(" ");
-			else
-				printf(" | ");
-
-			printf("%-*s",
-				   headers_show[i].max_length,
-				   headers_show[i].title);
-		}
-		printf("\n");
-		printf("-");
-
-		for (i = 0; i < SHOW_HEADER_COUNT; i++)
-		{
-			int			j;
-
-			for (j = 0; j < headers_show[i].max_length; j++)
-				printf("-");
-
-			if (i < (SHOW_HEADER_COUNT - 1))
-				printf("-+-");
-			else
-				printf("-");
-		}
-
-		printf("\n");
+		print_status_header(SHOW_HEADER_COUNT, headers_show);
 	}
 
 	for (cell = nodes.head; cell; cell = cell->next)
@@ -414,7 +406,6 @@ do_cluster_show(void)
 	PQfinish(conn);
 
 	/* emit any warnings */
-
 	if (warnings.head != NULL && runtime_options.terse == false && runtime_options.output_mode != OM_CSV)
 	{
 		ItemListCell *cell = NULL;
@@ -424,6 +415,25 @@ do_cluster_show(void)
 		{
 			printf(_("  - %s\n"), cell->string);
 		}
+
+		if (runtime_options.verbose == false && connection_error_found == true)
+		{
+			log_hint(_("execute with --verbose option to see connection error messages"));
+		}
+	}
+
+	/*
+	 * If warnings were noted, even if they're not displayed (e.g. in --csv node),
+	 * that means something's not right so we need to emit a non-zero exit code.
+	 */
+	if (warnings.head != NULL)
+	{
+		error_found = true;
+	}
+
+	if (error_found == true)
+	{
+		exit(ERR_NODE_STATUS);
 	}
 }
 
@@ -436,6 +446,7 @@ do_cluster_show(void)
  *   --all
  *   --node-[id|name]
  *   --event
+ *   --csv
  */
 
 void
@@ -480,8 +491,12 @@ do_cluster_event(void)
 	strncpy(headers_event[EV_TIMESTAMP].title, _("Timestamp"), MAXLEN);
 	strncpy(headers_event[EV_DETAILS].title, _("Details"), MAXLEN);
 
-	/* if --terse provided, simply omit the "Details" column */
-	if (runtime_options.terse == true)
+	/*
+	 * If --terse or --csv provided, simply omit the "Details" column.
+	 * In --csv mode we'd need to quote/escape the contents "Details" column,
+	 * which is doable but which will remain a TODO for now.
+	 */
+	if (runtime_options.terse == true || runtime_options.output_mode == OM_CSV)
 		column_count --;
 
 	for (i = 0; i < column_count; i++)
@@ -504,47 +519,64 @@ do_cluster_event(void)
 
 	}
 
-	for (i = 0; i < column_count; i++)
+	if (runtime_options.output_mode == OM_TEXT)
 	{
-		if (i == 0)
-			printf(" ");
-		else
-			printf(" | ");
+		for (i = 0; i < column_count; i++)
+		{
+			if (i == 0)
+				printf(" ");
+			else
+				printf(" | ");
 
-		printf("%-*s",
-			   headers_event[i].max_length,
-			   headers_event[i].title);
+			printf("%-*s",
+				   headers_event[i].max_length,
+				   headers_event[i].title);
+		}
+		printf("\n");
+		printf("-");
+		for (i = 0; i < column_count; i++)
+		{
+			int			j;
+
+			for (j = 0; j < headers_event[i].max_length; j++)
+				printf("-");
+
+			if (i < (column_count - 1))
+				printf("-+-");
+			else
+				printf("-");
+		}
+
+		printf("\n");
 	}
-	printf("\n");
-	printf("-");
-	for (i = 0; i < column_count; i++)
-	{
-		int			j;
-
-		for (j = 0; j < headers_event[i].max_length; j++)
-			printf("-");
-
-		if (i < (column_count - 1))
-			printf("-+-");
-		else
-			printf("-");
-	}
-
-	printf("\n");
 
 	for (i = 0; i < PQntuples(res); i++)
 	{
 		int			j;
 
-		printf(" ");
-		for (j = 0; j < column_count; j++)
+		if (runtime_options.output_mode == OM_CSV)
 		{
-			printf("%-*s",
-				   headers_event[j].max_length,
-				   PQgetvalue(res, i, j));
+			for (j = 0; j < column_count; j++)
+			{
+				printf("%s", PQgetvalue(res, i, j));
+				if ((j + 1) < column_count)
+				{
+					printf(",");
+				}
+			}
+		}
+		else
+		{
+			printf(" ");
+			for (j = 0; j < column_count; j++)
+			{
+				printf("%-*s",
+					   headers_event[j].max_length,
+					   PQgetvalue(res, i, j));
 
-			if (j < (column_count - 1))
-				printf(" | ");
+				if (j < (column_count - 1))
+					printf(" | ");
+			}
 		}
 
 		printf("\n");
@@ -554,7 +586,8 @@ do_cluster_event(void)
 
 	PQfinish(conn);
 
-	puts("");
+	if (runtime_options.output_mode == OM_TEXT)
+		puts("");
 }
 
 
@@ -569,7 +602,12 @@ do_cluster_crosscheck(void)
 
 	t_node_status_cube **cube;
 
-	n = build_cluster_crosscheck(&cube, &name_length);
+	bool		connection_error_found = false;
+	int			error_code = SUCCESS;
+	ItemList	warnings = {NULL, NULL};
+
+	n = build_cluster_crosscheck(&cube, &name_length, &warnings, &error_code);
+
 	if (runtime_options.output_mode == OM_CSV)
 	{
 		for (i = 0; i < n; i++)
@@ -591,6 +629,11 @@ do_cluster_crosscheck(void)
 					   cube[i]->node_id,
 					   cube[j]->node_id,
 					   max_node_status);
+
+				if (max_node_status == -1)
+				{
+					connection_error_found = true;
+				}
 			}
 
 		}
@@ -651,11 +694,13 @@ do_cluster_crosscheck(void)
 						break;
 					case -1:
 						c = 'x';
+						connection_error_found = true;
 						break;
 					case 0:
 						c = '*';
 						break;
 					default:
+						log_error("unexpected node status value %i", max_node_status);
 						exit(ERR_INTERNAL);
 				}
 
@@ -664,6 +709,13 @@ do_cluster_crosscheck(void)
 
 			printf("\n");
 		}
+
+		if (warnings.head != NULL && runtime_options.terse == false)
+		{
+			log_warning(_("following problems detected:"));
+			print_item_list(&warnings);
+		}
+
 	}
 
 	/* clean up allocated cube array */
@@ -689,9 +741,24 @@ do_cluster_crosscheck(void)
 
 		free(cube);
 	}
+
+	/* errors detected by build_cluster_crosscheck() have priority */
+	if (connection_error_found == true)
+	{
+		error_code = ERR_NODE_STATUS;
+	}
+
+	exit(error_code);
+
 }
 
 
+/*
+ * CLUSTER MATRIX
+ *
+ * Parameters:
+ *   --csv
+ */
 void
 do_cluster_matrix()
 {
@@ -704,16 +771,30 @@ do_cluster_matrix()
 
 	t_node_matrix_rec **matrix_rec_list;
 
-	n = build_cluster_matrix(&matrix_rec_list, &name_length);
+	bool		connection_error_found = false;
+	int			error_code = SUCCESS;
+	ItemList	warnings = {NULL, NULL};
+
+	n = build_cluster_matrix(&matrix_rec_list, &name_length, &warnings, &error_code);
 
 	if (runtime_options.output_mode == OM_CSV)
 	{
 		for (i = 0; i < n; i++)
+		{
 			for (j = 0; j < n; j++)
+			{
 				printf("%d,%d,%d\n",
 					   matrix_rec_list[i]->node_id,
 					   matrix_rec_list[i]->node_status_list[j]->node_id,
 					   matrix_rec_list[i]->node_status_list[j]->node_status);
+
+				if (matrix_rec_list[i]->node_status_list[j]->node_status == -2
+					|| matrix_rec_list[i]->node_status_list[j]->node_status == -1)
+				{
+					connection_error_found = true;
+				}
+			}
+		}
 	}
 	else
 	{
@@ -745,11 +826,13 @@ do_cluster_matrix()
 						break;
 					case -1:
 						c = 'x';
+						connection_error_found = true;
 						break;
 					case 0:
 						c = '*';
 						break;
 					default:
+						log_error("unexpected node status value %i", matrix_rec_list[i]->node_status_list[j]->node_status);
 						exit(ERR_INTERNAL);
 				}
 
@@ -757,6 +840,13 @@ do_cluster_matrix()
 			}
 			printf("\n");
 		}
+
+		if (warnings.head != NULL && runtime_options.terse == false)
+		{
+			log_warning(_("following problems detected:"));
+			print_item_list(&warnings);
+		}
+
 	}
 
 	for (i = 0; i < n; i++)
@@ -770,6 +860,14 @@ do_cluster_matrix()
 	}
 
 	free(matrix_rec_list);
+
+	/* actual database connection errors have priority */
+	if (connection_error_found == true)
+	{
+		error_code = ERR_NODE_STATUS;
+	}
+
+	exit(error_code);
 }
 
 
@@ -798,7 +896,7 @@ matrix_set_node_status(t_node_matrix_rec **matrix_rec_list, int n, int node_id,
 
 
 static int
-build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
+build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length, ItemList *warnings, int *error_code)
 {
 	PGconn	   *conn = NULL;
 	int			i = 0,
@@ -827,7 +925,12 @@ build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
 		local_node_id = runtime_options.node_id;
 	}
 
-	get_all_node_records(conn, &nodes);
+	if (get_all_node_records(conn, &nodes) == false)
+	{
+		/* get_all_node_records() will display the error */
+		PQfinish(conn);
+		exit(ERR_BAD_CONFIG);
+	}
 
 	PQfinish(conn);
 	conn = NULL;
@@ -841,7 +944,7 @@ build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
 	/*
 	 * Allocate an empty matrix record list
 	 *
-	 * -2 == NULL  ? -1 == Error x 0 == OK    *
+	 * -2 == NULL  ? -1 == Error x 0 == OK
 	 */
 
 	matrix_rec_list = (t_node_matrix_rec **) pg_malloc0(sizeof(t_node_matrix_rec) * nodes.node_count);
@@ -904,7 +1007,7 @@ build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
 
 		host = param_get(&remote_conninfo, "host");
 
-		node_conn = establish_db_connection(cell->node_info->conninfo, false);
+		node_conn = establish_db_connection_quiet(cell->node_info->conninfo);
 
 		connection_status =
 			(PQstatus(node_conn) == CONNECTION_OK) ? 0 : -1;
@@ -941,31 +1044,18 @@ build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
 		 * remote repmgr - those are the only values it needs to work, and
 		 * saves us making assumptions about the location of repmgr.conf
 		 */
-		appendPQExpBuffer(&command,
-						  "\"%s -d '%s' ",
-						  make_pg_path(progname()),
-						  cell->node_info->conninfo);
+		appendPQExpBufferChar(&command, '"');
 
+		make_remote_repmgr_path(&command, cell->node_info);
 
-		if (strlen(pg_bindir))
-		{
-			appendPQExpBuffer(&command,
-							  "--pg_bindir=");
-			appendShellString(&command,
-							  pg_bindir);
-			appendPQExpBuffer(&command,
-							  " ");
-		}
-
-		appendPQExpBuffer(&command,
-						  " cluster show --csv\"");
+		appendPQExpBufferStr(&command,
+							 " cluster show --csv -L NOTICE --terse\"");
 
 		log_verbose(LOG_DEBUG, "build_cluster_matrix(): executing:\n  %s", command.data);
 
 		initPQExpBuffer(&command_output);
 
-		(void) remote_command(
-							  host,
+		(void) remote_command(host,
 							  runtime_options.remote_user,
 							  command.data,
 							  &command_output);
@@ -974,32 +1064,50 @@ build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
 
 		termPQExpBuffer(&command);
 
-		for (j = 0; j < nodes.node_count; j++)
+		/* no output returned - probably SSH error */
+		if (p[0] == '\0' || p[0] == '\n')
 		{
-			if (sscanf(p, "%d,%d", &x, &y) != 2)
+			item_list_append_format(warnings,
+									"node %i inaccessible via SSH",
+									connection_node_id);
+			*error_code = ERR_BAD_SSH;
+		}
+		else
+		{
+			for (j = 0; j < nodes.node_count; j++)
 			{
-				fprintf(stderr, _("cannot parse --csv output: %s\n"), p);
-				PQfinish(node_conn);
-				exit(ERR_INTERNAL);
+				if (sscanf(p, "%d,%d", &x, &y) != 2)
+				{
+					matrix_set_node_status(matrix_rec_list,
+										   nodes.node_count,
+										   connection_node_id,
+										   x,
+										   -2);
+
+					item_list_append_format(warnings,
+											"unable to parse --csv output for node %i; output returned was:\n\"%s\"",
+											connection_node_id, p);
+					*error_code = ERR_INTERNAL;
+				}
+				else
+				{
+					matrix_set_node_status(matrix_rec_list,
+										   nodes.node_count,
+										   connection_node_id,
+										   x,
+										   (y == -1) ? -1 : 0);
+				}
+
+				while (*p && (*p != '\n'))
+					p++;
+				if (*p == '\n')
+					p++;
 			}
-
-			matrix_set_node_status(matrix_rec_list,
-								   nodes.node_count,
-								   connection_node_id,
-								   x,
-								   (y == -1) ? -1 : 0);
-
-			while (*p && (*p != '\n'))
-				p++;
-			if (*p == '\n')
-				p++;
 		}
 
 		termPQExpBuffer(&command_output);
 		PQfinish(node_conn);
 		free_conninfo_params(&remote_conninfo);
-
-		node_conn = NULL;
 	}
 
 	*matrix_rec_dest = matrix_rec_list;
@@ -1012,7 +1120,7 @@ build_cluster_matrix(t_node_matrix_rec ***matrix_rec_dest, int *name_length)
 
 
 static int
-build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length)
+build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length, ItemList *warnings, int *error_code)
 {
 	PGconn	   *conn = NULL;
 	int			h,
@@ -1033,7 +1141,12 @@ build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length)
 	else
 		conn = establish_db_connection_by_params(&source_conninfo, true);
 
-	get_all_node_records(conn, &nodes);
+	if (get_all_node_records(conn, &nodes) == false)
+	{
+		/* get_all_node_records() will display the error */
+		PQfinish(conn);
+		exit(ERR_BAD_CONFIG);
+	}
 
 	PQfinish(conn);
 	conn = NULL;
@@ -1120,33 +1233,17 @@ build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length)
 
 		initPQExpBuffer(&command);
 
-		appendPQExpBuffer(&command,
-						  "%s -d '%s' --node-id=%i ",
-						  make_pg_path(progname()),
-						  cell->node_info->conninfo,
-						  remote_node_id);
+		make_remote_repmgr_path(&command, cell->node_info);
 
-		if (strlen(pg_bindir))
-		{
-			appendPQExpBuffer(&command,
-							  "--pg_bindir=");
-			appendShellString(&command,
-							  pg_bindir);
-			appendPQExpBuffer(&command,
-							  " ");
-		}
-
-		appendPQExpBuffer(&command,
-						  "cluster matrix --csv 2>/dev/null");
+		appendPQExpBufferStr(&command,
+							 " cluster matrix --csv -L NOTICE --terse");
 
 		initPQExpBuffer(&command_output);
 
-		/* fix to work with --node-id */
 		if (cube[i]->node_id == config_file_options.node_id)
 		{
-			(void) local_command(
-								 command.data,
-								 &command_output);
+			(void) local_command_simple(command.data,
+										&command_output);
 		}
 		else
 		{
@@ -1170,8 +1267,7 @@ build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length)
 
 			log_verbose(LOG_DEBUG, "build_cluster_crosscheck(): executing\n  %s", quoted_command.data);
 
-			(void) remote_command(
-								  host,
+			(void) remote_command(host,
 								  runtime_options.remote_user,
 								  quoted_command.data,
 								  &command_output);
@@ -1184,9 +1280,13 @@ build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length)
 
 		p = command_output.data;
 
-		if (!strlen(command_output.data))
+		if (p[0] == '\0' || p[0] == '\n')
 		{
+			item_list_append_format(warnings,
+									"node %i inaccessible via SSH",
+									remote_node_id);
 			termPQExpBuffer(&command_output);
+			*error_code = ERR_BAD_SSH;
 			continue;
 		}
 
@@ -1198,16 +1298,23 @@ build_cluster_crosscheck(t_node_status_cube ***dest_cube, int *name_length)
 
 			if (sscanf(p, "%d,%d,%d", &matrix_rec_node_id, &node_status_node_id, &node_status) != 3)
 			{
-				fprintf(stderr, _("cannot parse --csv output: %s\n"), p);
-				exit(ERR_INTERNAL);
+				cube_set_node_status(cube,
+									 nodes.node_count,
+									 remote_node_id,
+									 matrix_rec_node_id,
+									 node_status_node_id,
+									 -2);
+				*error_code = ERR_INTERNAL;
+			}
+			else
+			{
+				cube_set_node_status(cube,
+									 nodes.node_count,
+									 remote_node_id,
+									 matrix_rec_node_id,
+									 node_status_node_id,
+									 node_status);
 			}
-
-			cube_set_node_status(cube,
-								 nodes.node_count,
-								 remote_node_id,
-								 matrix_rec_node_id,
-								 node_status_node_id,
-								 node_status);
 
 			while (*p && (*p != '\n'))
 				p++;
@@ -1267,6 +1374,7 @@ do_cluster_cleanup(void)
 	PGconn	   *conn = NULL;
 	PGconn	   *primary_conn = NULL;
 	int			entries_to_delete = 0;
+	PQExpBufferData event_details;
 
 	conn = establish_db_connection(config_file_options.conninfo, true);
 
@@ -1278,9 +1386,17 @@ do_cluster_cleanup(void)
 
 	log_debug(_("number of days of monitoring history to retain: %i"), runtime_options.keep_history);
 
-	entries_to_delete = get_number_of_monitoring_records_to_delete(primary_conn, runtime_options.keep_history);
+	entries_to_delete = get_number_of_monitoring_records_to_delete(primary_conn,
+																   runtime_options.keep_history,
+																   runtime_options.node_id);
 
-	if (entries_to_delete == 0)
+	if (entries_to_delete < 0)
+	{
+		log_error(_("unable to query number of monitoring records to clean up"));
+		PQfinish(primary_conn);
+		exit(ERR_DB_QUERY);
+	}
+	else if (entries_to_delete == 0)
 	{
 		log_info(_("no monitoring records to delete"));
 		PQfinish(primary_conn);
@@ -1290,10 +1406,23 @@ do_cluster_cleanup(void)
 	log_debug("at least %i monitoring records for deletion",
 			  entries_to_delete);
 
-	if (delete_monitoring_records(primary_conn, runtime_options.keep_history) == false)
+	initPQExpBuffer(&event_details);
+
+	if (delete_monitoring_records(primary_conn, runtime_options.keep_history, runtime_options.node_id) == false)
 	{
-		log_error(_("unable to delete monitoring records"));
+		appendPQExpBufferStr(&event_details,
+						  _("unable to delete monitoring records"));
+
+		log_error("%s", event_details.data);
 		log_detail("%s", PQerrorMessage(primary_conn));
+
+		create_event_notification(primary_conn,
+								  &config_file_options,
+								  config_file_options.node_id,
+								  "cluster_cleanup",
+								  false,
+								  event_details.data);
+
 		PQfinish(primary_conn);
 		exit(ERR_DB_QUERY);
 	}
@@ -1305,19 +1434,40 @@ do_cluster_cleanup(void)
 		log_detail("%s", PQerrorMessage(primary_conn));
 	}
 
-
-	PQfinish(primary_conn);
-
-	if (runtime_options.keep_history > 0)
+	if (runtime_options.keep_history == 0)
 	{
-		log_notice(_("monitoring records older than %i day(s) deleted"),
-				   runtime_options.keep_history);
+		appendPQExpBufferStr(&event_details,
+						  _("all monitoring records deleted"));
 	}
 	else
 	{
-		log_info(_("all monitoring records deleted"));
+		appendPQExpBufferStr(&event_details,
+						  _("monitoring records deleted"));
 	}
 
+	if (runtime_options.node_id != UNKNOWN_NODE_ID)
+		appendPQExpBuffer(&event_details,
+						  _(" for node %i"),
+						  runtime_options.node_id);
+
+	if (runtime_options.keep_history > 0)
+		appendPQExpBuffer(&event_details,
+						  _("; records newer than %i day(s) retained"),
+						  runtime_options.keep_history);
+
+	create_event_notification(primary_conn,
+							  &config_file_options,
+							  config_file_options.node_id,
+							  "cluster_cleanup",
+							  true,
+							  event_details.data);
+
+	log_notice("%s", event_details.data);
+
+	termPQExpBuffer(&event_details);
+	PQfinish(primary_conn);
+
+
 	return;
 }
 
@@ -1332,6 +1482,7 @@ do_cluster_help(void)
 	printf(_("    %s [OPTIONS] cluster matrix\n"), progname());
 	printf(_("    %s [OPTIONS] cluster crosscheck\n"), progname());
 	printf(_("    %s [OPTIONS] cluster event\n"), progname());
+	printf(_("    %s [OPTIONS] cluster cleanup\n"), progname());
 	puts("");
 
 	printf(_("CLUSTER SHOW\n"));
@@ -1371,6 +1522,7 @@ do_cluster_help(void)
 	printf(_("    --event                   filter specific event\n"));
 	printf(_("    --node-id                 restrict entries to node with this ID\n"));
 	printf(_("    --node-name               restrict entries to node with this name\n"));
+	printf(_("    --csv                     emit output as CSV\n"));
 	puts("");
 
 	printf(_("CLUSTER CLEANUP\n"));

repmgr-action-daemon.c

@@ -0,0 +1,420 @@
+/*
+ * repmgr-action-daemon.c
+ *
+ * Implements repmgrd actions for the repmgr command line utility
+ * Copyright (c) 2ndQuadrant, 2010-2018
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "repmgr.h"
+
+#include "repmgr-client-global.h"
+#include "repmgr-action-daemon.h"
+
+
+
+/*
+ * Possibly also show:
+ *  - repmgrd start time?
+ *  - repmgrd mode
+ *  - priority
+ *  - whether promotion candidate (due to zero priority/different location)
+ */
+
+typedef enum
+{
+	STATUS_ID = 0,
+	STATUS_NAME,
+	STATUS_ROLE,
+	STATUS_PG,
+	STATUS_RUNNING,
+	STATUS_PID,
+	STATUS_PAUSED
+} StatusHeader;
+
+#define STATUS_HEADER_COUNT 7
+
+struct ColHeader headers_status[STATUS_HEADER_COUNT];
+
+static void fetch_node_records(PGconn *conn, NodeInfoList *node_list);
+static void _do_repmgr_pause(bool pause);
+
+
+void
+do_daemon_status(void)
+{
+	PGconn	   *conn = NULL;
+	NodeInfoList nodes = T_NODE_INFO_LIST_INITIALIZER;
+	NodeInfoListCell *cell = NULL;
+	int i;
+	RepmgrdInfo **repmgrd_info;
+	ItemList	warnings = {NULL, NULL};
+
+	/* Connect to local database to obtain cluster connection data */
+	log_verbose(LOG_INFO, _("connecting to database"));
+
+	if (strlen(config_file_options.conninfo))
+		conn = establish_db_connection(config_file_options.conninfo, true);
+	else
+		conn = establish_db_connection_by_params(&source_conninfo, true);
+
+	fetch_node_records(conn, &nodes);
+
+	repmgrd_info = (RepmgrdInfo **) pg_malloc0(sizeof(RepmgrdInfo *) * nodes.node_count);
+
+	if (repmgrd_info == NULL)
+	{
+		log_error(_("unable to allocate memory"));
+		exit(ERR_OUT_OF_MEMORY);
+	}
+
+	strncpy(headers_status[STATUS_ID].title, _("ID"), MAXLEN);
+	strncpy(headers_status[STATUS_NAME].title, _("Name"), MAXLEN);
+	strncpy(headers_status[STATUS_ROLE].title, _("Role"), MAXLEN);
+	strncpy(headers_status[STATUS_PG].title, _("Status"), MAXLEN);
+	strncpy(headers_status[STATUS_RUNNING].title, _("repmgrd"), MAXLEN);
+	strncpy(headers_status[STATUS_PID].title, _("PID"), MAXLEN);
+	strncpy(headers_status[STATUS_PAUSED].title, _("Paused?"), MAXLEN);
+
+	for (i = 0; i < STATUS_HEADER_COUNT; i++)
+	{
+		headers_status[i].max_length = strlen(headers_status[i].title);
+	}
+
+	i = 0;
+
+	for (cell = nodes.head; cell; cell = cell->next)
+	{
+		int j;
+
+		repmgrd_info[i] = pg_malloc0(sizeof(RepmgrdInfo));
+		repmgrd_info[i]->node_id = cell->node_info->node_id;
+		repmgrd_info[i]->pid = UNKNOWN_PID;
+		repmgrd_info[i]->paused = false;
+		repmgrd_info[i]->running = false;
+		repmgrd_info[i]->pg_running = true;
+
+		cell->node_info->conn = establish_db_connection_quiet(cell->node_info->conninfo);
+
+		if (PQstatus(cell->node_info->conn) != CONNECTION_OK)
+		{
+			if (runtime_options.verbose)
+			{
+				char		error[MAXLEN];
+
+				strncpy(error, PQerrorMessage(cell->node_info->conn), MAXLEN);
+
+				item_list_append_format(&warnings,
+										"when attempting to connect to node \"%s\" (ID: %i), following error encountered :\n\"%s\"",
+										cell->node_info->node_name, cell->node_info->node_id, trim(error));
+			}
+			else
+			{
+				item_list_append_format(&warnings,
+										"unable to  connect to node \"%s\" (ID: %i)",
+										cell->node_info->node_name, cell->node_info->node_id);
+			}
+
+			repmgrd_info[i]->pg_running = false;
+			maxlen_snprintf(repmgrd_info[i]->pg_running_text, "%s", _("not running"));
+			maxlen_snprintf(repmgrd_info[i]->repmgrd_running, "%s", _("n/a"));
+			maxlen_snprintf(repmgrd_info[i]->pid_text, "%s", _("n/a"));
+		}
+		else
+		{
+			maxlen_snprintf(repmgrd_info[i]->pg_running_text, "%s", _("running"));
+
+			repmgrd_info[i]->pid = repmgrd_get_pid(cell->node_info->conn);
+
+			repmgrd_info[i]->running = repmgrd_is_running(cell->node_info->conn);
+
+			if (repmgrd_info[i]->running == true)
+			{
+				maxlen_snprintf(repmgrd_info[i]->repmgrd_running, "%s", _("running"));
+			}
+			else
+			{
+				maxlen_snprintf(repmgrd_info[i]->repmgrd_running, "%s", _("not running"));
+			}
+
+			if (repmgrd_info[i]->pid == UNKNOWN_PID)
+			{
+				maxlen_snprintf(repmgrd_info[i]->pid_text, "%s", _("n/a"));
+			}
+			else
+			{
+				maxlen_snprintf(repmgrd_info[i]->pid_text, "%i", repmgrd_info[i]->pid);
+			}
+
+			repmgrd_info[i]->paused = repmgrd_is_paused(cell->node_info->conn);
+
+			PQfinish(cell->node_info->conn);
+		}
+
+
+		headers_status[STATUS_NAME].cur_length = strlen(cell->node_info->node_name);
+		headers_status[STATUS_ROLE].cur_length = strlen(get_node_type_string(cell->node_info->type));
+		headers_status[STATUS_PID].cur_length = strlen(repmgrd_info[i]->pid_text);
+		headers_status[STATUS_RUNNING].cur_length = strlen(repmgrd_info[i]->repmgrd_running);
+		headers_status[STATUS_PG].cur_length = strlen(repmgrd_info[i]->pg_running_text);
+
+		for (j = 0; j < STATUS_HEADER_COUNT; j++)
+		{
+			if (headers_status[j].cur_length > headers_status[j].max_length)
+			{
+				headers_status[j].max_length = headers_status[j].cur_length;
+			}
+		}
+
+		i++;
+	}
+
+	/* Print column header row (text mode only) */
+	if (runtime_options.output_mode == OM_TEXT)
+	{
+		print_status_header(STATUS_HEADER_COUNT, headers_status);
+	}
+
+	i = 0;
+
+	for (cell = nodes.head; cell; cell = cell->next)
+	{
+		if (runtime_options.output_mode == OM_CSV)
+		{
+			printf("%i,%s,%s,%i,%i,%i,%i\n",
+				   cell->node_info->node_id,
+				   cell->node_info->node_name,
+				   get_node_type_string(cell->node_info->type),
+				   repmgrd_info[i]->pg_running ? 1 : 0,
+				   repmgrd_info[i]->running ? 1 : 0,
+				   repmgrd_info[i]->pid,
+				   repmgrd_info[i]->paused ? 1 : 0);
+		}
+		else
+		{
+			printf(" %-*i ",  headers_status[STATUS_ID].max_length, cell->node_info->node_id);
+			printf("| %-*s ", headers_status[STATUS_NAME].max_length, cell->node_info->node_name);
+			printf("| %-*s ", headers_status[STATUS_ROLE].max_length, get_node_type_string(cell->node_info->type));
+
+			printf("| %-*s ", headers_status[STATUS_PG].max_length, repmgrd_info[i]->pg_running_text);
+			printf("| %-*s ", headers_status[STATUS_RUNNING].max_length, repmgrd_info[i]->repmgrd_running);
+			printf("| %-*s ", headers_status[STATUS_PID].max_length, repmgrd_info[i]->pid_text);
+
+			if (repmgrd_info[i]->pid == UNKNOWN_PID)
+				printf("| %-*s ", headers_status[STATUS_PAUSED].max_length, "n/a");
+			else
+				printf("| %-*s ", headers_status[STATUS_PAUSED].max_length, repmgrd_info[i]->paused ? "yes" : "no");
+
+			printf("\n");
+		}
+
+		free(repmgrd_info[i]);
+		i++;
+	}
+
+	free(repmgrd_info);
+
+	/* emit any warnings */
+
+	if (warnings.head != NULL && runtime_options.terse == false && runtime_options.output_mode != OM_CSV)
+	{
+		ItemListCell *cell = NULL;
+
+		printf(_("\nWARNING: following issues were detected\n"));
+		for (cell = warnings.head; cell; cell = cell->next)
+		{
+			printf(_("  - %s\n"), cell->string);
+		}
+
+		if (runtime_options.verbose == false)
+		{
+			log_hint(_("execute with --verbose option to see connection error messages"));
+		}
+	}
+}
+
+void
+do_daemon_pause(void)
+{
+	_do_repmgr_pause(true);
+}
+
+void
+do_daemon_unpause(void)
+{
+	_do_repmgr_pause(false);
+}
+
+
+static void
+_do_repmgr_pause(bool pause)
+{
+	PGconn	   *conn = NULL;
+	NodeInfoList nodes = T_NODE_INFO_LIST_INITIALIZER;
+	NodeInfoListCell *cell = NULL;
+	RepmgrdInfo **repmgrd_info;
+	int i;
+	int error_nodes = 0;
+
+	repmgrd_info = (RepmgrdInfo **) pg_malloc0(sizeof(RepmgrdInfo *) * nodes.node_count);
+
+	if (repmgrd_info == NULL)
+	{
+		log_error(_("unable to allocate memory"));
+		exit(ERR_OUT_OF_MEMORY);
+	}
+
+	/* Connect to local database to obtain cluster connection data */
+	log_verbose(LOG_INFO, _("connecting to database"));
+
+	if (strlen(config_file_options.conninfo))
+		conn = establish_db_connection(config_file_options.conninfo, true);
+	else
+		conn = establish_db_connection_by_params(&source_conninfo, true);
+
+	fetch_node_records(conn, &nodes);
+
+	i = 0;
+
+	for (cell = nodes.head; cell; cell = cell->next)
+	{
+		repmgrd_info[i] = pg_malloc0(sizeof(RepmgrdInfo));
+		repmgrd_info[i]->node_id = cell->node_info->node_id;
+
+		log_verbose(LOG_DEBUG, "pausing node %i (%s)",
+					cell->node_info->node_id,
+					cell->node_info->node_name);
+		cell->node_info->conn = establish_db_connection_quiet(cell->node_info->conninfo);
+
+		if (PQstatus(cell->node_info->conn) != CONNECTION_OK)
+		{
+			log_warning(_("unable to connect to node %i"),
+						cell->node_info->node_id);
+			error_nodes++;
+		}
+		else
+		{
+			if (runtime_options.dry_run == true)
+			{
+				if (pause == true)
+				{
+					log_info(_("would pause node %i (%s) "),
+							 cell->node_info->node_id,
+							 cell->node_info->node_name);
+				}
+				else
+				{
+					log_info(_("would unpause node %i (%s) "),
+							 cell->node_info->node_id,
+							 cell->node_info->node_name);
+				}
+			}
+			else
+			{
+				bool success = repmgrd_pause(cell->node_info->conn, pause);
+
+				if (success == false)
+					error_nodes++;
+
+				log_notice(_("node %i (%s) %s"),
+						   cell->node_info->node_id,
+						   cell->node_info->node_name,
+						   success == true
+								? pause == true ? "paused" : "unpaused"
+		   						: pause == true ? "not paused" : "not unpaused");
+			}
+			PQfinish(cell->node_info->conn);
+		}
+		i++;
+	}
+
+	if (error_nodes > 0)
+	{
+		if (pause == true)
+		{
+			log_error(_("unable to pause %i node(s)"), error_nodes);
+		}
+		else
+		{
+			log_error(_("unable to unpause %i node(s)"), error_nodes);
+		}
+
+		log_hint(_("execute \"repmgr daemon status\" to view current status"));
+
+		exit(ERR_REPMGRD_PAUSE);
+	}
+
+	exit(SUCCESS);
+}
+
+
+
+void
+fetch_node_records(PGconn *conn, NodeInfoList *node_list)
+{
+	bool success = get_all_node_records(conn, node_list);
+
+	if (success == false)
+	{
+		/* get_all_node_records() will display any error message */
+		PQfinish(conn);
+		exit(ERR_BAD_CONFIG);
+	}
+
+	if (node_list->node_count == 0)
+	{
+		log_error(_("no node records were found"));
+		log_hint(_("ensure at least one node is registered"));
+		PQfinish(conn);
+		exit(ERR_BAD_CONFIG);
+	}
+}
+
+
+void do_daemon_help(void)
+{
+	print_help_header();
+
+	printf(_("Usage:\n"));
+	printf(_("    %s [OPTIONS] daemon status\n"),  progname());
+	printf(_("    %s [OPTIONS] daemon pause\n"),   progname());
+	printf(_("    %s [OPTIONS] daemon unpause\n"), progname());
+	puts("");
+
+	printf(_("DAEMON STATUS\n"));
+	puts("");
+	printf(_("  \"daemon status\" shows the status of repmgrd on each node in the cluster\n"));
+	puts("");
+	printf(_("    --csv                     emit output as CSV\n"));
+	printf(_("    --verbose                 show text of database connection error messages\n"));
+	puts("");
+
+	printf(_("DAEMON PAUSE\n"));
+	puts("");
+	printf(_("  \"daemon pause\" instructs repmgrd on each node to pause failover detection\n"));
+	puts("");
+	printf(_("    --dry-run               check if nodes are reachable but don't pause repmgrd\n"));
+	puts("");
+
+	printf(_("DAEMON PAUSE\n"));
+	puts("");
+	printf(_("  \"daemon unpause\"  instructs repmgrd on each node to resume failover detection\n"));
+	puts("");
+	printf(_("    --dry-run               check if nodes are reachable but don't unpause repmgrd\n"));
+	puts("");
+
+
+	puts("");
+}

repmgr-action-daemon.h

@@ -0,0 +1,28 @@
+/*
+ * repmgr-action-daemon.h
+ * Copyright (c) 2ndQuadrant, 2010-2018
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _REPMGR_ACTION_DAEMON_H_
+#define _REPMGR_ACTION_DAEMON_H_
+
+
+extern void do_daemon_status(void);
+extern void do_daemon_pause(void);
+extern void do_daemon_unpause(void);
+
+extern void do_daemon_help(void);
+#endif

repmgr-action-primary.c

@@ -64,12 +64,10 @@ do_primary_register(void)
 			PQfinish(conn);
 			exit(ERR_BAD_CONFIG);
 		}
-		else
-		{
-			log_error(_("connection to node lost"));
-			PQfinish(conn);
-			exit(ERR_DB_CONN);
-		}
+
+		log_error(_("unable to determine server's recovery type"));
+		PQfinish(conn);
+		exit(ERR_DB_CONN);
 	}
 
 	log_verbose(LOG_INFO, _("server is not in recovery"));
@@ -172,8 +170,8 @@ do_primary_register(void)
 											&node_info);
 		if (record_created == true)
 		{
-			appendPQExpBuffer(&event_description,
-							  "existing primary record updated");
+			appendPQExpBufferStr(&event_description,
+								 "existing primary record updated");
 		}
 		else
 		{

repmgr-action-witness.c

@@ -65,7 +65,7 @@ do_witness_register(void)
 	if (recovery_type == RECTYPE_STANDBY)
 	{
 		log_error(_("provided node is a standby"));
-		log_error(_("a witness node must run on an independent primary server"));
+		log_hint(_("a witness node must run on an independent primary server"));
 
 		PQfinish(witness_conn);
 
@@ -86,6 +86,7 @@ do_witness_register(void)
 
 	/* connect to primary with provided parameters */
 	log_info(_("connecting to primary node"));
+
 	/*
 	 * Extract the repmgr user and database names from the conninfo string
 	 * provided in repmgr.conf
@@ -135,8 +136,11 @@ do_witness_register(void)
 		exit(ERR_BAD_CONFIG);
 	}
 
-	/* XXX sanity check witness node is not part of main cluster */
-
+	/*
+	 * TODO: sanity check witness node is not part of main cluster; we could
+	 * add a random application_name to the respective connections,
+	 * and do a simple check of pg_stat_activity
+	 */
 
 	/* create repmgr extension, if does not exist */
 	if (runtime_options.dry_run == false &&  !create_repmgr_extension(witness_conn))
@@ -182,7 +186,6 @@ do_witness_register(void)
 			log_error(_("witness node is already registered"));
 			log_hint(_("use option -F/--force to reregister the node"));
 
-
 			PQfinish(witness_conn);
 			PQfinish(primary_conn);
 
@@ -190,14 +193,38 @@ do_witness_register(void)
 		}
 	}
 
+	/*
+	 * Check that an active node with the same node_name doesn't exist already
+	 */
 
-	// XXX check other node with same name does not exist
+	record_status = get_node_record_by_name(primary_conn,
+											config_file_options.node_name,
+											&node_record);
+
+
+	if (record_status == RECORD_FOUND)
+	{
+		if (node_record.active == true && node_record.node_id != config_file_options.node_id)
+		{
+			log_error(_("node %i exists already with node_name \"%s\""),
+					  node_record.node_id,
+					  config_file_options.node_name);
+			PQfinish(primary_conn);
+			exit(ERR_BAD_CONFIG);
+		}
+	}
 
 	/*
 	 * if repmgr.nodes contains entries, delete if -F/--force provided,
 	 * otherwise exit with error
 	 */
-	get_all_node_records(witness_conn, &nodes);
+	if (get_all_node_records(witness_conn, &nodes) == false)
+	{
+		/* get_all_node_records() will display the error */
+		PQfinish(witness_conn);
+		PQfinish(primary_conn);
+		exit(ERR_BAD_CONFIG);
+	}
 
 	log_verbose(LOG_DEBUG, "%i node records found", nodes.node_count);
 
@@ -222,6 +249,7 @@ do_witness_register(void)
 		PQfinish(witness_conn);
 		exit(SUCCESS);
 	}
+
 	/* create record on primary */
 
 	/*
@@ -288,55 +316,59 @@ do_witness_register(void)
 void
 do_witness_unregister(void)
 {
-	PGconn	   *witness_conn = NULL;
+	PGconn	   *local_conn = NULL;
 	PGconn	   *primary_conn = NULL;
 	t_node_info node_record = T_NODE_INFO_INITIALIZER;
 	RecordStatus record_status = RECORD_NOT_FOUND;
 	bool		node_record_deleted = false;
-	bool		witness_available = true;
+	bool		local_node_available = true;
+	int			witness_node_id = UNKNOWN_NODE_ID;
 
-	log_info(_("connecting to witness node \"%s\" (ID: %i)"),
+	if (runtime_options.node_id != UNKNOWN_NODE_ID)
+	{
+		/* user has specified the witness node id */
+		witness_node_id = runtime_options.node_id;
+	}
+	else
+	{
+		/* assume witness node is local node */
+		witness_node_id = config_file_options.node_id;
+	}
+
+	log_info(_("connecting to node \"%s\" (ID: %i)"),
 			 config_file_options.node_name,
 			 config_file_options.node_id);
 
-	witness_conn = establish_db_connection_quiet(config_file_options.conninfo);
+	local_conn = establish_db_connection_quiet(config_file_options.conninfo);
 
-	if (PQstatus(witness_conn) != CONNECTION_OK)
+	if (PQstatus(local_conn) != CONNECTION_OK)
 	{
 		if (!runtime_options.force)
 		{
-			log_error(_("unable to connect to witness node \"%s\" (ID: %i)"),
+			log_error(_("unable to connect to node \"%s\" (ID: %i)"),
 					  config_file_options.node_name,
 					  config_file_options.node_id);
-			log_detail("%s", PQerrorMessage(witness_conn));
-			log_hint(_("provide -F/--force to remove the witness record if the server is not running"));
+			log_detail("%s", PQerrorMessage(local_conn));
 			exit(ERR_BAD_CONFIG);
 		}
 
 		log_notice(_("unable to connect to witness node \"%s\" (ID: %i), removing node record on cluster primary only"),
 				   config_file_options.node_name,
 				   config_file_options.node_id);
-		witness_available = false;
+		local_node_available = false;
 	}
 
-	if (witness_available == true)
+	if (local_node_available == true)
 	{
-		primary_conn = get_primary_connection_quiet(witness_conn, NULL, NULL);
+		primary_conn = get_primary_connection_quiet(local_conn, NULL, NULL);
 	}
 	else
 	{
 		/*
-		 * Extract the repmgr user and database names from the conninfo string
-		 * provided in repmgr.conf
+		 * Assume user has provided connection details for the primary server
 		 */
-		get_conninfo_value(config_file_options.conninfo, "user", repmgr_user);
-		get_conninfo_value(config_file_options.conninfo, "dbname", repmgr_db);
-
-		param_set_ine(&source_conninfo, "user", repmgr_user);
-		param_set_ine(&source_conninfo, "dbname", repmgr_db);
 
 		primary_conn = establish_db_connection_by_params(&source_conninfo, false);
-
 	}
 
 	if (PQstatus(primary_conn) != CONNECTION_OK)
@@ -344,26 +376,26 @@ do_witness_unregister(void)
 		log_error(_("unable to connect to primary"));
 		log_detail("%s", PQerrorMessage(primary_conn));
 
-		if (witness_available == true)
+		if (local_node_available == true)
 		{
-			PQfinish(witness_conn);
+			PQfinish(local_conn);
 		}
-		else
+		else if (runtime_options.connection_param_provided == false)
 		{
-			log_hint(_("provide connection details to primary server"));
+			log_hint(_("provide connection details for the primary server"));
 		}
 		exit(ERR_BAD_CONFIG);
 	}
 
 	/* Check node exists and is really a witness */
-	record_status = get_node_record(primary_conn, config_file_options.node_id, &node_record);
+	record_status = get_node_record(primary_conn, witness_node_id, &node_record);
 
 	if (record_status != RECORD_FOUND)
 	{
-		log_error(_("no record found for node %i"), config_file_options.node_id);
+		log_error(_("no record found for node %i"), witness_node_id);
 
-		if (witness_available == true)
-			PQfinish(witness_conn);
+		if (local_node_available == true)
+			PQfinish(local_conn);
 		PQfinish(primary_conn);
 
 		exit(ERR_BAD_CONFIG);
@@ -371,11 +403,17 @@ do_witness_unregister(void)
 
 	if (node_record.type != WITNESS)
 	{
+		/*
+		 * The node (either explicitly provided with --node-id, or the local node)
+		 * is not a witness.
+		 *
+		 * TODO: scan node list and print hint about identity of known witness servers.
+		 */
 		log_error(_("node %i is not a witness node"), config_file_options.node_id);
 		log_detail(_("node %i is a %s node"), config_file_options.node_id, get_node_type_string(node_record.type));
 
-		if (witness_available == true)
-			PQfinish(witness_conn);
+		if (local_node_available == true)
+			PQfinish(local_conn);
 		PQfinish(primary_conn);
 
 		exit(ERR_BAD_CONFIG);
@@ -384,49 +422,43 @@ do_witness_unregister(void)
 	if (runtime_options.dry_run == true)
 	{
 		log_info(_("prerequisites for unregistering the witness node are met"));
-		if (witness_available == true)
-			PQfinish(witness_conn);
+		if (local_node_available == true)
+			PQfinish(local_conn);
 		PQfinish(primary_conn);
 
 		exit(SUCCESS);
 	}
 
-	log_info(_("unregistering witness node %i"), config_file_options.node_id);
+	log_info(_("unregistering witness node %i"), witness_node_id);
 	node_record_deleted = delete_node_record(primary_conn,
-										     config_file_options.node_id);
+										     witness_node_id);
 
 	if (node_record_deleted == false)
 	{
 		PQfinish(primary_conn);
-		PQfinish(witness_conn);
-		exit(ERR_BAD_CONFIG);
-	}
 
-	/* sync records from primary */
-	if (witness_available == true && witness_copy_node_records(primary_conn, witness_conn) == false)
-	{
-		log_error(_("unable to copy repmgr node records from primary"));
-		PQfinish(primary_conn);
-		PQfinish(witness_conn);
+		if (local_node_available == true)
+			PQfinish(local_conn);
+		PQfinish(local_conn);
 		exit(ERR_BAD_CONFIG);
 	}
 
 	/* Log the event */
 	create_event_record(primary_conn,
 						&config_file_options,
-						config_file_options.node_id,
+						witness_node_id,
 						"witness_unregister",
 						true,
 						NULL);
 
 	PQfinish(primary_conn);
 
-	if (witness_available == true)
-		PQfinish(witness_conn);
+	if (local_node_available == true)
+		PQfinish(local_conn);
 
 	log_info(_("witness unregistration complete"));
-	log_detail(_("witness node with id %i (conninfo: %s) successfully unregistered"),
-			    config_file_options.node_id, config_file_options.conninfo);
+	log_detail(_("witness node with ID %i successfully unregistered"),
+			    witness_node_id);
 
 	return;
 }
@@ -446,16 +478,19 @@ void do_witness_help(void)
 	puts("");
 	printf(_("  Requires provision of connection information for the primary\n"));
 	puts("");
-	printf(_("  --dry-run                           check prerequisites but don't make any changes\n"));
-	printf(_("  -F, --force                         overwrite an existing node record\n"));
+	printf(_("  --dry-run                check prerequisites but don't make any changes\n"));
+	printf(_("  -F, --force              overwrite an existing node record\n"));
 	puts("");
 
 	printf(_("WITNESS UNREGISTER\n"));
 	puts("");
 	printf(_("  \"witness register\" unregisters a witness node.\n"));
 	puts("");
-	printf(_("  --dry-run                           check prerequisites but don't make any changes\n"));
-	printf(_("  -F, --force                         unregister when witness node not running\n"));
+	printf(_("  --dry-run                check prerequisites but don't make any changes\n"));
+	printf(_("  -F, --force              unregister when witness node not running\n"));
+	printf(_("  --node-id                node ID of the witness node (provide if executing on\n"));
+	printf(_("                             another node)\n"));
+
 	puts("");
 
 	return;

repmgr-client-global.h

@@ -42,10 +42,12 @@ typedef struct
 	bool		force;
 	char		pg_bindir[MAXLEN];	/* overrides setting in repmgr.conf */
 	bool		wait;
+	bool		no_wait;
 
 	/* logging options */
 	char		log_level[MAXLEN];	/* overrides setting in repmgr.conf */
 	bool		log_to_file;
+	bool		quiet;
 	bool		terse;
 	bool		verbose;
 
@@ -92,8 +94,10 @@ typedef struct
 
 	/* "standby switchover" options */
 	bool		always_promote;
-	bool		force_rewind;
+	bool		force_rewind_used;
+	char		force_rewind_path[MAXPGPATH];
 	bool		siblings_follow;
+	bool		repmgrd_no_pause;
 
 	/* "node status" options */
 	bool		is_shutdown_cleanly;
@@ -104,6 +108,7 @@ typedef struct
 	bool		replication_lag;
 	bool		role;
 	bool		slots;
+	bool		missing_slots;
 	bool		has_passfile;
 	bool		replication_connection;
 
@@ -133,9 +138,9 @@ typedef struct
 		/* configuration metadata */ \
 		false, false, false, false,	\
 		/* general configuration options */	\
-		"", false, false, "", false,	\
+		"", false, false, "", false, false,	\
 		/* logging options */ \
-		"", false, false, false, \
+		"", false, false, false, false,	\
 		/* output options */ \
 		false, false, false,  \
 		/* database connection options */ \
@@ -150,13 +155,13 @@ typedef struct
 		/* "standby clone"/"standby follow" options */ \
 		NO_UPSTREAM_NODE, \
 		/* "standby register" options */ \
-		false, 0, DEFAULT_WAIT_START,   \
+		false, -1, DEFAULT_WAIT_START,   \
 		/* "standby switchover" options */ \
-		false, false, false, \
+		false, false, "", false, false,	\
 		/* "node status" options */ \
 		false, \
 		/* "node check" options */ \
-		false, false, false, false, false, false, false, \
+		false, false, false, false, false, false, false, false,	\
 		/* "node join" options */ \
 		"", \
 		/* "node service" options */ \
@@ -189,6 +194,14 @@ typedef enum
 } t_server_action;
 
 
+typedef struct ColHeader
+{
+	char		title[MAXLEN];
+	int			max_length;
+	int			cur_length;
+} ColHeader;
+
+
 
 /* global configuration structures */
 extern t_runtime_options runtime_options;
@@ -208,6 +221,7 @@ extern void check_93_config(void);
 extern bool create_repmgr_extension(PGconn *conn);
 extern int	test_ssh_connection(char *host, char *remote_user);
 extern bool local_command(const char *command, PQExpBufferData *outputbuf);
+extern bool local_command_simple(const char *command, PQExpBufferData *outputbuf);
 
 extern standy_clone_mode get_standby_clone_mode(void);
 
@@ -223,12 +237,18 @@ extern void get_superuser_connection(PGconn **conn, PGconn **superuser_conn, PGc
 extern bool remote_command(const char *host, const char *user, const char *command, PQExpBufferData *outputbuf);
 
 extern void make_remote_repmgr_path(PQExpBufferData *outputbuf, t_node_info *remote_node_record);
+
+/* display functions */
 extern void print_help_header(void);
+extern void print_status_header(int cols, ColHeader *headers);
 
 /* server control functions */
 extern void get_server_action(t_server_action action, char *script, char *data_dir);
 extern bool data_dir_required_for_action(t_server_action action);
+extern void get_node_config_directory(char *config_dir_buf);
 extern void get_node_data_directory(char *data_dir_buf);
 extern void init_node_record(t_node_info *node_record);
+extern bool can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *reason);
+extern void drop_replication_slot_if_exists(PGconn *conn, int node_id, char *slot_name);
 
 #endif							/* _REPMGR_CLIENT_GLOBAL_H_ */

repmgr-client.c

@@ -30,10 +30,15 @@
  * NODE STATUS
  * NODE CHECK
  *
+ * DAEMON STATUS
+ * DAEMON PAUSE
+ * DAEMON UNPAUSE
+ *
  * For internal use:
  * NODE REJOIN
  * NODE SERVICE
  *
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -53,6 +58,7 @@
 
 #include "repmgr.h"
 #include "compat.h"
+#include "controldata.h"
 #include "repmgr-client.h"
 #include "repmgr-client-global.h"
 #include "repmgr-action-primary.h"
@@ -61,6 +67,7 @@
 #include "repmgr-action-bdr.h"
 #include "repmgr-action-node.h"
 #include "repmgr-action-cluster.h"
+#include "repmgr-action-daemon.h"
 
 #include <storage/fd.h>			/* for PG_TEMP_FILE_PREFIX */
 
@@ -90,13 +97,14 @@ t_node_info target_node_info = T_NODE_INFO_INITIALIZER;
 static ItemList cli_errors = {NULL, NULL};
 static ItemList cli_warnings = {NULL, NULL};
 
+static bool _local_command(const char *command, PQExpBufferData *outputbuf, bool simple);
 
 int
 main(int argc, char **argv)
 {
 	t_conninfo_param_list default_conninfo = T_CONNINFO_PARAM_LIST_INITIALIZER;
 
-	int			optindex;
+	int			optindex = 0;
 	int			c;
 
 	char	   *repmgr_command = NULL;
@@ -106,6 +114,7 @@ main(int argc, char **argv)
 	char	   *dummy_action = "";
 
 	bool		help_option = false;
+	bool		option_error_found = false;
 
 	set_progname(argv[0]);
 
@@ -176,7 +185,10 @@ main(int argc, char **argv)
 		strncpy(runtime_options.username, pw->pw_name, MAXLEN);
 	}
 
-	while ((c = getopt_long(argc, argv, "?Vb:f:FWd:h:p:U:R:S:D:ck:L:tvC:", long_options,
+	/* Make getopt emitting errors */
+	opterr = 1;
+
+	while ((c = getopt_long(argc, argv, "?Vb:f:FwWd:h:p:U:R:S:D:ck:L:qtvC:", long_options,
 							&optindex)) != -1)
 	{
 		/*
@@ -194,13 +206,7 @@ main(int argc, char **argv)
 			case OPT_HELP:		/* --help */
 				help_option = true;
 				break;
-			case '?':
-				/* Actual help option given */
-				if (strcmp(argv[optind - 1], "-?") == 0)
-				{
-					help_option = true;
-				}
-				break;
+
 			case 'V':
 
 				/*
@@ -241,11 +247,16 @@ main(int argc, char **argv)
 				strncpy(runtime_options.replication_user, optarg, MAXLEN);
 				break;
 
-				/* -W/--wait */
-			case 'W':
+				/* -w/--wait */
+			case 'w':
 				runtime_options.wait = true;
 				break;
 
+				/* -W/--no-wait */
+			case 'W':
+				runtime_options.no_wait = true;
+				break;
+
 				/*----------------------------
 				 * database connection options
 				 *----------------------------
@@ -420,13 +431,23 @@ main(int argc, char **argv)
 				break;
 
 			case OPT_FORCE_REWIND:
-				runtime_options.force_rewind = true;
+				runtime_options.force_rewind_used = true;
+
+				if (optarg != NULL)
+				{
+					strncpy(runtime_options.force_rewind_path, optarg, MAXPGPATH);
+				}
+
 				break;
 
 			case OPT_SIBLINGS_FOLLOW:
 				runtime_options.siblings_follow = true;
 				break;
 
+			case OPT_REPMGRD_NO_PAUSE:
+				runtime_options.repmgrd_no_pause = true;
+				break;
+
 				/*----------------------
 				 * "node status" options
 				 *----------------------
@@ -460,6 +481,10 @@ main(int argc, char **argv)
 				runtime_options.slots = true;
 				break;
 
+			case OPT_MISSING_SLOTS:
+				runtime_options.missing_slots = true;
+				break;
+
 			case OPT_HAS_PASSFILE:
 				runtime_options.has_passfile = true;
 				break;
@@ -559,6 +584,12 @@ main(int argc, char **argv)
 				logger_output_mode = OM_DAEMON;
 				break;
 
+
+				/* --quiet */
+			case 'q':
+				runtime_options.quiet = true;
+				break;
+
 				/* --terse */
 			case 't':
 				runtime_options.terse = true;
@@ -614,14 +645,29 @@ main(int argc, char **argv)
 								 _("--recovery-min-apply-delay is now a configuration file parameter, \"recovery_min_apply_delay\""));
 				break;
 
+			case ':':   /* missing option argument */
+				option_error_found = true;
+				break;
+			case '?':
+				/* Actual help option given? */
+				if (strcmp(argv[optind - 1], "-?") == 0)
+				{
+					help_option = true;
+					break;
+				}
+				/* otherwise fall through to default */
+			default:    /* invalid option */
+				option_error_found = true;
+				break;
 		}
 	}
 
+
 	/*
 	 * If -d/--dbname appears to be a conninfo string, validate by attempting
 	 * to parse it (and if successful, store the parsed parameters)
 	 */
-	if (runtime_options.dbname)
+	if (runtime_options.dbname[0])
 	{
 		if (strncmp(runtime_options.dbname, "postgresql://", 13) == 0 ||
 			strncmp(runtime_options.dbname, "postgres://", 11) == 0 ||
@@ -717,9 +763,10 @@ main(int argc, char **argv)
 	if (cli_errors.head != NULL)
 	{
 		free_conninfo_params(&source_conninfo);
-		exit_with_cli_errors(&cli_errors);
+		exit_with_cli_errors(&cli_errors, NULL);
 	}
 
+
 	/*----------
 	 * Determine the node type and action; following are valid:
 	 *
@@ -863,6 +910,21 @@ main(int argc, char **argv)
 			else if (strcasecmp(repmgr_action, "CLEANUP") == 0)
 				action = CLUSTER_CLEANUP;
 		}
+		else if (strcasecmp(repmgr_command, "DAEMON") == 0)
+		{
+			if (help_option == true)
+			{
+				do_daemon_help();
+				exit(SUCCESS);
+			}
+
+			if (strcasecmp(repmgr_action, "STATUS") == 0)
+				action = DAEMON_STATUS;
+			else if (strcasecmp(repmgr_action, "PAUSE") == 0)
+				action = DAEMON_PAUSE;
+			else if (strcasecmp(repmgr_action, "UNPAUSE") == 0)
+				action = DAEMON_UNPAUSE;
+		}
 		else
 		{
 			valid_repmgr_command_found = false;
@@ -966,9 +1028,30 @@ main(int argc, char **argv)
 	if (cli_errors.head != NULL)
 	{
 		free_conninfo_params(&source_conninfo);
-		exit_with_cli_errors(&cli_errors);
+
+		exit_with_cli_errors(&cli_errors, valid_repmgr_command_found == true ? repmgr_command : NULL);
 	}
 
+	/* no errors detected by repmgr, but getopt might have */
+	if (option_error_found == true)
+	{
+		if (valid_repmgr_command_found == true)
+		{
+			printf(_("Try \"%s --help\" or \"%s %s --help\" for more information.\n"),
+				   progname(),
+				   progname(),
+				   repmgr_command);
+		}
+		else
+		{
+			printf(_("Try \"repmgr --help\" for more information.\n"));
+		}
+
+		free_conninfo_params(&source_conninfo);
+		exit(ERR_BAD_CONFIG);
+	}
+
+
 	/*
 	 * Print any warnings about inappropriate command line options, unless
 	 * -t/--terse set
@@ -997,7 +1080,6 @@ main(int argc, char **argv)
 		runtime_options.output_mode = OM_OPTFORMAT;
 	}
 
-
 	/*
 	 * Check for configuration file items which can be overriden by runtime
 	 * options
@@ -1055,6 +1137,28 @@ main(int argc, char **argv)
 	if (runtime_options.terse)
 		logger_set_terse();
 
+	/*
+	 * If --dry-run specified, ensure log_level is at least LOG_INFO, regardless
+	 * of what's in the configuration file or -L/--log-level paremeter, otherwise
+	 * some or output might not be displayed.
+	 */
+	if (runtime_options.dry_run == true)
+	{
+		logger_set_min_level(LOG_INFO);
+	}
+
+	/*
+	 * If -q/--quiet supplied, suppress any non-ERROR log output.
+	 * This overrides everything else; we'll leave it up to the user to deal with the
+	 * consequences of e.g. running --dry-run together with -q/--quiet.
+	 */
+	if (runtime_options.quiet == true)
+	{
+		logger_set_level(LOG_ERROR);
+	}
+
+
+
 	/*
 	 * Node configuration information is not needed for all actions, with
 	 * STANDBY CLONE being the main exception.
@@ -1219,6 +1323,17 @@ main(int argc, char **argv)
 			do_cluster_cleanup();
 			break;
 
+			/* DAEMON */
+		case DAEMON_STATUS:
+			do_daemon_status();
+			break;
+		case DAEMON_PAUSE:
+			do_daemon_pause();
+			break;
+		case DAEMON_UNPAUSE:
+			do_daemon_unpause();
+			break;
+
 		default:
 			/* An action will have been determined by this point  */
 			break;
@@ -1315,6 +1430,15 @@ check_cli_parameters(const int action)
 										 _("--no-upstream-connection only effective in Barman mode"));
 					}
 				}
+
+				if (strlen(config_file_options.config_directory))
+				{
+					if (runtime_options.copy_external_config_files == false)
+					{
+						item_list_append(&cli_warnings,
+										 _("\"config_directory\" set in repmgr.conf, but --copy-external-config-files not provided"));
+					}
+				}
 			}
 			break;
 
@@ -1431,6 +1555,8 @@ check_cli_parameters(const int action)
 		{
 			case PRIMARY_UNREGISTER:
 			case STANDBY_UNREGISTER:
+			case WITNESS_UNREGISTER:
+			case CLUSTER_CLEANUP:
 			case CLUSTER_EVENT:
 			case CLUSTER_MATRIX:
 			case CLUSTER_CROSSCHECK:
@@ -1471,6 +1597,7 @@ check_cli_parameters(const int action)
 			case STANDBY_CLONE:
 			case STANDBY_REGISTER:
 			case STANDBY_FOLLOW:
+			case BDR_REGISTER:
 				break;
 			default:
 				item_list_append_format(&cli_warnings,
@@ -1563,6 +1690,41 @@ check_cli_parameters(const int action)
 		}
 	}
 
+	/* --wait/--no-wait */
+
+	if (runtime_options.wait == true && runtime_options.no_wait == true)
+	{
+		item_list_append_format(&cli_errors,
+								_("both --wait and --no-wait options provided"));
+	}
+	else
+	{
+		if (runtime_options.wait)
+		{
+			switch (action)
+			{
+				case STANDBY_FOLLOW:
+					break;
+				default:
+					item_list_append_format(&cli_warnings,
+											_("--wait will be ignored when executing %s"),
+											action_name(action));
+			}
+		}
+		else if (runtime_options.wait)
+		{
+			switch (action)
+			{
+				case NODE_REJOIN:
+					break;
+				default:
+					item_list_append_format(&cli_warnings,
+											_("--no-wait will be ignored when executing %s"),
+											action_name(action));
+			}
+		}
+	}
+
 	/* repmgr node service --action */
 	if (runtime_options.action[0] != '\0')
 	{
@@ -1604,7 +1766,7 @@ check_cli_parameters(const int action)
 		}
 	}
 
-	if (runtime_options.force_rewind == true)
+	if (runtime_options.force_rewind_used == true)
 	{
 		switch (action)
 		{
@@ -1618,6 +1780,18 @@ check_cli_parameters(const int action)
 		}
 	}
 
+	if (runtime_options.repmgrd_no_pause == true)
+	{
+		switch (action)
+		{
+			case STANDBY_SWITCHOVER:
+				break;
+			default:
+				item_list_append_format(&cli_warnings,
+										_("--repmgrd-no-pause will be ignored when executing %s"),
+										action_name(action));
+		}
+	}
 
 	if (runtime_options.config_files[0] != '\0')
 	{
@@ -1646,6 +1820,8 @@ check_cli_parameters(const int action)
 			case WITNESS_UNREGISTER:
 			case NODE_REJOIN:
 			case NODE_SERVICE:
+			case DAEMON_PAUSE:
+			case DAEMON_UNPAUSE:
 				break;
 			default:
 				item_list_append_format(&cli_warnings,
@@ -1725,6 +1901,14 @@ action_name(const int action)
 			return "CLUSTER MATRIX";
 		case CLUSTER_CROSSCHECK:
 			return "CLUSTER CROSSCHECK";
+
+		case DAEMON_STATUS:
+			return "DAEMON STATUS";
+		case DAEMON_PAUSE:
+			return "DAEMON PAUSE";
+		case DAEMON_UNPAUSE:
+			return "DAEMON UNPAUSE";
+
 	}
 
 	return "UNKNOWN ACTION";
@@ -1752,6 +1936,42 @@ print_error_list(ItemList *error_list, int log_level)
 }
 
 
+void
+print_status_header(int cols, ColHeader *headers)
+{
+	int i;
+
+	for (i = 0; i < cols; i++)
+	{
+		if (i == 0)
+			printf(" ");
+		else
+			printf(" | ");
+
+		printf("%-*s",
+			   headers[i].max_length,
+			   headers[i].title);
+	}
+	printf("\n");
+	printf("-");
+
+	for (i = 0; i < cols; i++)
+	{
+		int			j;
+
+		for (j = 0; j < headers[i].max_length; j++)
+			printf("-");
+
+		if (i < (cols - 1))
+			printf("-+-");
+		else
+			printf("-");
+	}
+
+	printf("\n");
+}
+
+
 void
 print_help_header(void)
 {
@@ -1778,8 +1998,9 @@ do_help(void)
 	printf(_("    %s [OPTIONS] standby {register|unregister|clone|promote|follow|switchover}\n"), progname());
 	printf(_("    %s [OPTIONS] bdr     {register|unregister}\n"), progname());
 	printf(_("    %s [OPTIONS] node    {status|check|rejoin|service}\n"), progname());
-	printf(_("    %s [OPTIONS] cluster {show|event|matrix|crosscheck}\n"), progname());
+	printf(_("    %s [OPTIONS] cluster {show|event|matrix|crosscheck|cleanup}\n"), progname());
 	printf(_("    %s [OPTIONS] witness {register|unregister}\n"), progname());
+	printf(_("    %s [OPTIONS] daemon  {status|pause|unpause}\n"), progname());
 
 	puts("");
 
@@ -1827,6 +2048,7 @@ do_help(void)
 	printf(_("  --dry-run                           show what would happen for action, but don't execute it\n"));
 	printf(_("  -L, --log-level                     set log level (overrides configuration file; default: NOTICE)\n"));
 	printf(_("  --log-to-file                       log to file (or logging facility) defined in repmgr.conf\n"));
+	printf(_("  -q, --quiet                         suppress all log output apart from errors\n"));
 	printf(_("  -t, --terse                         don't display detail, hints and other non-critical output\n"));
 	printf(_("  -v, --verbose                       display additional log output (useful for debugging)\n"));
 
@@ -2096,12 +2318,28 @@ test_ssh_connection(char *host, char *remote_user)
 }
 
 
+
+
 /*
  * Execute a command locally. "outputbuf" should either be an
  * initialised PQexpbuffer, or NULL
  */
 bool
 local_command(const char *command, PQExpBufferData *outputbuf)
+{
+	return _local_command(command, outputbuf, false);
+}
+
+
+bool
+local_command_simple(const char *command, PQExpBufferData *outputbuf)
+{
+	return _local_command(command, outputbuf, true);
+}
+
+
+static bool
+_local_command(const char *command, PQExpBufferData *outputbuf, bool simple)
 {
 	FILE	   *fp = NULL;
 	char		output[MAXLEN];
@@ -2128,7 +2366,8 @@ local_command(const char *command, PQExpBufferData *outputbuf)
 	while (fgets(output, MAXLEN, fp) != NULL)
 	{
 		appendPQExpBuffer(outputbuf, "%s", output);
-		if (!feof(fp))
+
+		if (!feof(fp) && simple == false)
 		{
 			break;
 		}
@@ -2171,6 +2410,7 @@ get_superuser_connection(PGconn **conn, PGconn **superuser_conn, PGconn **privil
 		log_error(_("no database connection available"));
 		exit(ERR_INTERNAL);
 	}
+
 	is_superuser = is_superuser_connection(*conn, &userinfo);
 
 	if (is_superuser == true)
@@ -2212,6 +2452,8 @@ get_superuser_connection(PGconn **conn, PGconn **superuser_conn, PGconn **privil
 		exit(ERR_BAD_CONFIG);
 	}
 
+	log_debug("established superuser connection as \"%s\"", runtime_options.superuser);
+
 	*privileged_conn = *superuser_conn;
 	return;
 }
@@ -2353,9 +2595,6 @@ copy_remote_files(char *host, char *remote_user, char *remote_path,
 }
 
 
-
-
-
 /*
  * Execute a command via ssh on the remote host.
  *
@@ -2421,7 +2660,7 @@ remote_command(const char *host, const char *user, const char *command, PQExpBuf
 	if (outputbuf != NULL)
 	{
 		if (strlen(outputbuf->data))
-			log_verbose(LOG_DEBUG, "remote_command(): output returned was:\n  %s", outputbuf->data);
+			log_verbose(LOG_DEBUG, "remote_command(): output returned was:\n%s", outputbuf->data);
 		else
 			log_verbose(LOG_DEBUG, "remote_command(): no output returned");
 	}
@@ -2433,11 +2672,29 @@ remote_command(const char *host, const char *user, const char *command, PQExpBuf
 void
 make_remote_repmgr_path(PQExpBufferData *output_buf, t_node_info *remote_node_record)
 {
+	if (config_file_options.repmgr_bindir[0] != '\0')
+	{
+		int			len = strlen(config_file_options.repmgr_bindir);
+
+		appendPQExpBufferStr(output_buf,
+							 config_file_options.repmgr_bindir);
+
+		/* Add trailing slash */
+		if (config_file_options.repmgr_bindir[len - 1] != '/')
+		{
+			appendPQExpBufferChar(output_buf, '/');
+		}
+	}
+	else if (pg_bindir[0] != '\0')
+	{
+		appendPQExpBufferStr(output_buf,
+							 pg_bindir);
+	}
+
 	appendPQExpBuffer(output_buf,
 					  "%s -f %s ",
-					  make_pg_path(progname()),
+					  progname(),
 					  remote_node_record->config_file);
-
 }
 
 
@@ -2670,6 +2927,33 @@ data_dir_required_for_action(t_server_action action)
 }
 
 
+/*
+ * Copy the location of the configuration file directory into the
+ * provided buffer; if "config_directory" provided, use that, otherwise
+ * default to the data directory.
+ *
+ * This is primarily intended for use with "pg_ctl" (which itself shouldn't
+ * be used outside of development environments).
+ */
+void
+get_node_config_directory(char *config_dir_buf)
+{
+	if (config_file_options.config_directory[0] != '\0')
+	{
+		strncpy(config_dir_buf, config_file_options.config_directory, MAXPGPATH);
+		return;
+	}
+
+	if (config_file_options.data_directory[0] != '\0')
+	{
+		strncpy(config_dir_buf, config_file_options.data_directory, MAXPGPATH);
+		return;
+	}
+
+	return;
+}
+
+
 void
 get_node_data_directory(char *data_dir_buf)
 {
@@ -2734,3 +3018,119 @@ init_node_record(t_node_info *node_record)
 		create_slot_name(node_record->slot_name, config_file_options.node_id);
 	}
 }
+
+
+bool
+can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *reason)
+{
+	bool		can_use = true;
+	int			server_version_num = get_server_version(conn, NULL);
+
+	/* wal_log_hints not available in 9.3, so just determine if data checksums enabled */
+	if (server_version_num < 90400)
+	{
+		int			data_checksum_version = get_data_checksum_version(data_directory);
+
+		if (data_checksum_version < 0)
+		{
+			appendPQExpBuffer(reason,
+							  _("unable to determine data checksum version"));
+			can_use = false;
+		}
+		else if (data_checksum_version == 0)
+		{
+			appendPQExpBuffer(reason,
+							  _("this cluster was initialised without data checksums"));
+			can_use = false;
+		}
+
+		return can_use;
+	}
+
+	/* "full_page_writes" must be on in any case */
+	if (guc_set(conn, "full_page_writes", "=", "off"))
+	{
+		if (can_use == false)
+			appendPQExpBuffer(reason, "; ");
+
+		appendPQExpBuffer(reason,
+						  _("\"full_page_writes\" must be set to \"on\""));
+
+		can_use = false;
+	}
+
+	/*
+	 * "wal_log_hints" off - are data checksums available? Note: we're
+	 * checking the local pg_control file here as the value will be the same
+	 * throughout the cluster and saves a round-trip to the demotion
+	 * candidate.
+	 */
+	if (guc_set(conn, "wal_log_hints", "=", "on") == false)
+	{
+		int			data_checksum_version = get_data_checksum_version(data_directory);
+
+		if (data_checksum_version < 0)
+		{
+			if (can_use == false)
+				appendPQExpBuffer(reason, "; ");
+
+			appendPQExpBuffer(reason,
+							  _("\"wal_log_hints\" is set to \"off\" but unable to determine data checksum version"));
+			can_use = false;
+		}
+		else if (data_checksum_version == 0)
+		{
+			if (can_use == false)
+				appendPQExpBuffer(reason, "; ");
+
+			appendPQExpBuffer(reason,
+							  _("\"wal_log_hints\" is set to \"off\" and data checksums are disabled"));
+
+			can_use = false;
+		}
+	}
+
+	return can_use;
+}
+
+
+void
+drop_replication_slot_if_exists(PGconn *conn, int node_id, char *slot_name)
+{
+	t_replication_slot slot_info = T_REPLICATION_SLOT_INITIALIZER;
+	RecordStatus record_status = get_slot_record(conn, slot_name, &slot_info);
+
+	log_verbose(LOG_DEBUG, "attempting to delete slot \"%s\" on node %i",
+				slot_name, node_id);
+
+	if (record_status != RECORD_FOUND)
+	{
+		/* this is a good thing */
+		log_verbose(LOG_INFO,
+					_("slot \"%s\" does not exist on node %i, nothing to remove"),
+					slot_name, node_id);
+	}
+	else
+	{
+		if (slot_info.active == false)
+		{
+			if (drop_replication_slot(conn, slot_name) == true)
+			{
+				log_notice(_("replication slot \"%s\" deleted on node %i"), slot_name, node_id);
+			}
+			else
+			{
+				log_error(_("unable to delete replication slot \"%s\" on node %i"), slot_name, node_id);
+			}
+		}
+
+		/*
+		 * if active replication slot exists, call Houston as we have a
+		 * problem
+		 */
+		else
+		{
+			log_warning(_("replication slot \"%s\" is still active on node %i"), slot_name, node_id);
+		}
+	}
+}

repmgr-client.h

@@ -45,6 +45,9 @@
 #define CLUSTER_MATRIX		   19
 #define CLUSTER_CROSSCHECK	   20
 #define CLUSTER_EVENT		   21
+#define DAEMON_STATUS		   22
+#define DAEMON_PAUSE		   23
+#define DAEMON_UNPAUSE		   24
 
 /* command line options without short versions */
 #define OPT_HELP						   1001
@@ -86,6 +89,9 @@
 #define OPT_REPL_CONN                      1037
 #define OPT_REMOTE_NODE_ID                 1038
 #define OPT_RECOVERY_CONF_ONLY             1039
+#define OPT_NO_WAIT                        1040
+#define OPT_MISSING_SLOTS                  1041
+#define OPT_REPMGRD_NO_PAUSE               1042
 
 /* deprecated since 3.3 */
 #define OPT_DATA_DIR						999
@@ -104,7 +110,8 @@ static struct option long_options[] =
 	{"dry-run", no_argument, NULL, OPT_DRY_RUN},
 	{"force", no_argument, NULL, 'F'},
 	{"pg_bindir", required_argument, NULL, 'b'},
-	{"wait", no_argument, NULL, 'W'},
+	{"wait", no_argument, NULL, 'w'},
+	{"no-wait", no_argument, NULL, 'W'},
 
 /* connection options */
 	{"dbname", required_argument, NULL, 'd'},
@@ -123,6 +130,7 @@ static struct option long_options[] =
 /* logging options */
 	{"log-level", required_argument, NULL, 'L'},
 	{"log-to-file", no_argument, NULL, OPT_LOG_TO_FILE},
+	{"quiet",  no_argument, NULL, 'q'},
 	{"terse", no_argument, NULL, 't'},
 	{"verbose", no_argument, NULL, 'v'},
 
@@ -152,6 +160,7 @@ static struct option long_options[] =
  */
 	{"always-promote", no_argument, NULL, OPT_ALWAYS_PROMOTE},
 	{"siblings-follow", no_argument, NULL, OPT_SIBLINGS_FOLLOW},
+	{"repmgrd-no-pause", no_argument, NULL, OPT_REPMGRD_NO_PAUSE},
 
 /* "node status" options */
 	{"is-shutdown-cleanly", no_argument, NULL, OPT_IS_SHUTDOWN_CLEANLY},
@@ -162,13 +171,14 @@ static struct option long_options[] =
 	{"replication-lag", no_argument, NULL, OPT_REPLICATION_LAG},
 	{"role", no_argument, NULL, OPT_ROLE},
 	{"slots", no_argument, NULL, OPT_SLOTS},
+	{"missing-slots", no_argument, NULL, OPT_MISSING_SLOTS},
 	{"has-passfile", no_argument, NULL, OPT_HAS_PASSFILE},
 	{"replication-connection", no_argument, NULL, OPT_REPL_CONN},
 
 /* "node rejoin" options */
 	{"config-files", required_argument, NULL, OPT_CONFIG_FILES},
     {"config-archive-dir", required_argument, NULL, OPT_CONFIG_ARCHIVE_DIR},
-	{"force-rewind", no_argument, NULL, OPT_FORCE_REWIND},
+	{"force-rewind", optional_argument, NULL, OPT_FORCE_REWIND},
 
 /* "node service" options */
 	{"action", required_argument, NULL, OPT_ACTION},

repmgr.c

@@ -26,6 +26,7 @@
 #include "access/xlog.h"
 #include "miscadmin.h"
 #include "replication/walreceiver.h"
+#include "storage/fd.h"
 #include "storage/ipc.h"
 #include "storage/lwlock.h"
 #include "storage/procarray.h"
@@ -43,14 +44,21 @@
 #include "lib/stringinfo.h"
 #include "access/xact.h"
 #include "utils/snapmgr.h"
-#include "pgstat.h"
 
+#if (PG_VERSION_NUM >= 90400)
+#include "pgstat.h"
+#else
+#define PGSTAT_STAT_PERMANENT_DIRECTORY             "pg_stat"
+#endif
 
 #include "voting.h"
 
 #define UNKNOWN_NODE_ID		-1
+#define UNKNOWN_PID			-1
 
 #define TRANCHE_NAME "repmgrd"
+#define REPMGRD_STATE_FILE PGSTAT_STAT_PERMANENT_DIRECTORY "/repmgrd_state.txt"
+
 
 PG_MODULE_MAGIC;
 
@@ -66,6 +74,9 @@ typedef struct repmgrdSharedState
 	LWLockId	lock;			/* protects search/modification */
 	TimestampTz last_updated;
 	int			local_node_id;
+	int			repmgrd_pid;
+	char		repmgrd_pidfile[MAXPGPATH];
+	bool		repmgrd_paused;
 	/* streaming failover */
 	NodeVotingStatus voting_status;
 	int			current_electoral_term;
@@ -112,6 +123,25 @@ PG_FUNCTION_INFO_V1(am_bdr_failover_handler);
 Datum		unset_bdr_failover_handler(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(unset_bdr_failover_handler);
 
+Datum		set_repmgrd_pid(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(set_repmgrd_pid);
+
+Datum		get_repmgrd_pid(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(get_repmgrd_pid);
+
+Datum		get_repmgrd_pidfile(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(get_repmgrd_pidfile);
+
+Datum		repmgrd_is_running(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(repmgrd_is_running);
+
+Datum		repmgrd_pause(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(repmgrd_pause);
+
+Datum		repmgrd_is_paused(PG_FUNCTION_ARGS);
+PG_FUNCTION_INFO_V1(repmgrd_is_paused);
+
+
 
 /*
  * Module load callback
@@ -185,6 +215,9 @@ repmgr_shmem_startup(void)
 #endif
 
 		shared_state->local_node_id = UNKNOWN_NODE_ID;
+		shared_state->repmgrd_pid = UNKNOWN_PID;
+		memset(shared_state->repmgrd_pidfile, 0, MAXPGPATH);
+		shared_state->repmgrd_paused = false;
 		shared_state->current_electoral_term = 0;
 		shared_state->voting_status = VS_NO_VOTE;
 		shared_state->candidate_node_id = UNKNOWN_NODE_ID;
@@ -204,6 +237,8 @@ Datum
 set_local_node_id(PG_FUNCTION_ARGS)
 {
 	int			local_node_id = UNKNOWN_NODE_ID;
+	int			stored_node_id = UNKNOWN_NODE_ID;
+	int			paused = -1;
 
 	if (!shared_state)
 		PG_RETURN_NULL();
@@ -213,6 +248,34 @@ set_local_node_id(PG_FUNCTION_ARGS)
 
 	local_node_id = PG_GETARG_INT32(0);
 
+	/* read state file and if exists/valid, update "repmgrd_paused" */
+	{
+		FILE	   *file = NULL;
+
+		file = AllocateFile(REPMGRD_STATE_FILE, PG_BINARY_R);
+
+		if (file != NULL)
+		{
+			int			buffer_size = 128;
+			char		buffer[buffer_size];
+
+			if (fgets(buffer, buffer_size, file) != NULL)
+			{
+				if (sscanf(buffer, "%i:%i", &stored_node_id, &paused) != 2)
+				{
+					elog(WARNING, "unable to parse repmgrd state file");
+				}
+				else
+				{
+					elog(DEBUG1, "node_id: %i; paused: %i", stored_node_id, paused);
+				}
+			}
+
+			FreeFile(file);
+		}
+
+	}
+
 	LWLockAcquire(shared_state->lock, LW_EXCLUSIVE);
 
 	/* only set local_node_id once, as it should never change */
@@ -221,6 +284,19 @@ set_local_node_id(PG_FUNCTION_ARGS)
 		shared_state->local_node_id = local_node_id;
 	}
 
+	/* only update if state file valid */
+	if (stored_node_id == shared_state->local_node_id)
+	{
+		if (paused == 0)
+		{
+			shared_state->repmgrd_paused = false;
+		}
+		else if (paused == 1)
+		{
+			shared_state->repmgrd_paused = true;
+		}
+	}
+
 	LWLockRelease(shared_state->lock);
 
 	PG_RETURN_VOID();
@@ -416,9 +492,191 @@ unset_bdr_failover_handler(PG_FUNCTION_ARGS)
 		LWLockAcquire(shared_state->lock, LW_EXCLUSIVE);
 
 		shared_state->bdr_failover_handler = UNKNOWN_NODE_ID;
-
-		LWLockRelease(shared_state->lock);
 	}
 
+	LWLockRelease(shared_state->lock);
+
 	PG_RETURN_VOID();
 }
+
+
+/*
+ * Returns the repmgrd pid; or NULL if none set; or -1 if set but repmgrd
+ * process not running (TODO!)
+ */
+Datum
+get_repmgrd_pid(PG_FUNCTION_ARGS)
+{
+	int repmgrd_pid = UNKNOWN_PID;
+
+	if (!shared_state)
+		PG_RETURN_NULL();
+
+	LWLockAcquire(shared_state->lock, LW_SHARED);
+	repmgrd_pid = shared_state->repmgrd_pid;
+	LWLockRelease(shared_state->lock);
+
+	PG_RETURN_INT32(repmgrd_pid);
+}
+
+
+/*
+ * Returns the repmgrd pidfile
+ */
+Datum
+get_repmgrd_pidfile(PG_FUNCTION_ARGS)
+{
+	char repmgrd_pidfile[MAXPGPATH];
+
+	if (!shared_state)
+		PG_RETURN_NULL();
+
+	memset(repmgrd_pidfile, 0, MAXPGPATH);
+
+	LWLockAcquire(shared_state->lock, LW_SHARED);
+	strncpy(repmgrd_pidfile, shared_state->repmgrd_pidfile, MAXPGPATH);
+	LWLockRelease(shared_state->lock);
+
+	if (repmgrd_pidfile[0] == '\0')
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(repmgrd_pidfile));
+}
+
+Datum
+set_repmgrd_pid(PG_FUNCTION_ARGS)
+{
+	int repmgrd_pid = UNKNOWN_PID;
+	char *repmgrd_pidfile = NULL;
+
+	if (!shared_state)
+		PG_RETURN_VOID();
+
+	if (PG_ARGISNULL(0))
+	{
+		repmgrd_pid = UNKNOWN_PID;
+	}
+	else
+	{
+		repmgrd_pid = PG_GETARG_INT32(0);
+	}
+
+	elog(DEBUG3, "set_repmgrd_pid(): provided pid is %i", repmgrd_pid);
+
+	if (repmgrd_pid != UNKNOWN_PID && !PG_ARGISNULL(1))
+	{
+		repmgrd_pidfile = text_to_cstring(PG_GETARG_TEXT_PP(1));
+		elog(INFO, "set_repmgrd_pid(): provided pidfile is %s", repmgrd_pidfile);
+	}
+
+	LWLockAcquire(shared_state->lock, LW_EXCLUSIVE);
+
+	shared_state->repmgrd_pid = repmgrd_pid;
+	memset(shared_state->repmgrd_pidfile, 0, MAXPGPATH);
+
+	if(repmgrd_pidfile != NULL)
+	{
+		strncpy(shared_state->repmgrd_pidfile, repmgrd_pidfile, MAXPGPATH);
+	}
+
+	LWLockRelease(shared_state->lock);
+	PG_RETURN_VOID();
+}
+
+
+Datum
+repmgrd_is_running(PG_FUNCTION_ARGS)
+{
+	int repmgrd_pid = UNKNOWN_PID;
+	int kill_ret;
+
+	if (!shared_state)
+		PG_RETURN_NULL();
+
+	LWLockAcquire(shared_state->lock, LW_SHARED);
+	repmgrd_pid = shared_state->repmgrd_pid;
+	LWLockRelease(shared_state->lock);
+
+	/* No PID registered - assume not running */
+	if (repmgrd_pid == UNKNOWN_PID)
+	{
+		PG_RETURN_BOOL(false);
+	}
+
+	kill_ret = kill(repmgrd_pid, 0);
+
+	if (kill_ret == 0)
+	{
+		PG_RETURN_BOOL(true);
+	}
+
+	PG_RETURN_BOOL(false);
+}
+
+
+Datum
+repmgrd_pause(PG_FUNCTION_ARGS)
+{
+	bool		pause;
+	FILE	   *file = NULL;
+	StringInfoData buf;
+
+	if (!shared_state)
+		PG_RETURN_NULL();
+
+	if (PG_ARGISNULL(0))
+		PG_RETURN_NULL();
+
+	pause = PG_GETARG_BOOL(0);
+
+	LWLockAcquire(shared_state->lock, LW_EXCLUSIVE);
+	shared_state->repmgrd_paused = pause;
+	LWLockRelease(shared_state->lock);
+
+	/* write state to file */
+	file = AllocateFile(REPMGRD_STATE_FILE, PG_BINARY_W);
+
+	if (file == NULL)
+	{
+		elog(DEBUG1, "unable to allocate %s", REPMGRD_STATE_FILE);
+
+		// XXX anything else we can do? log?
+		PG_RETURN_VOID();
+	}
+
+	elog(DEBUG1, "allocated");
+
+	initStringInfo(&buf);
+
+	LWLockAcquire(shared_state->lock, LW_SHARED);
+
+	appendStringInfo(&buf, "%i:%i",
+					 shared_state->local_node_id,
+					 pause ? 1 : 0);
+	LWLockRelease(shared_state->lock);
+
+	// XXX check success
+	fwrite(buf.data, strlen(buf.data) + 1, 1, file);
+
+
+	resetStringInfo(&buf);
+	FreeFile(file);
+
+	PG_RETURN_VOID();
+}
+
+
+Datum
+repmgrd_is_paused(PG_FUNCTION_ARGS)
+{
+	bool is_paused;
+
+	if (!shared_state)
+		PG_RETURN_NULL();
+
+	LWLockAcquire(shared_state->lock, LW_SHARED);
+	is_paused = shared_state->repmgrd_paused;
+	LWLockRelease(shared_state->lock);
+
+	PG_RETURN_BOOL(is_paused);
+}

repmgr.conf.sample

@@ -40,18 +40,28 @@
 				 # is not running and there's no other way of determining
 				 # the data directory.
 
-#replication_user='repmgr'	 # User to make replication connections with, if not set defaults
-				 # to the user defined in "conninfo".
 
 # =============================================================================
 
 # Optional configuration items
 # =============================================================================
 
+
+#------------------------------------------------------------------------------
+# Server settings
+#------------------------------------------------------------------------------
+
+#config_directory=''		 # If configuration files are located outside the data
+				 # directory, specify the directory where the main
+				 # postgresql.conf file is located.
+
 #------------------------------------------------------------------------------
 # Replication settings
 #------------------------------------------------------------------------------
 
+#replication_user='repmgr'	 # User to make replication connections with, if not set defaults
+				 # to the user defined in "conninfo".
+
 #replication_type=physical	 # Must be one of 'physical' or 'bdr'.
 
 #location=default		 # arbitrary string defining the location of the node; this
@@ -65,9 +75,6 @@
 				 # at least the number of standbys which will connect
 				 # to the primary.
 
-#recovery_min_apply_delay=	 # If provided, "recovery_min_apply_delay" in recovery.conf
-				 # will be set to this value.
-
 #------------------------------------------------------------------------------
 # Witness server settings
 #------------------------------------------------------------------------------
@@ -91,7 +98,7 @@
 #log_facility=STDERR		 # Logging facility: possible values are STDERR, or for
 				 # syslog integration, one of LOCAL0, LOCAL1, ..., LOCAL7, USER
 
-#log_file=''			 # stderr can be redirected to an arbitrary file:
+#log_file=''			 # STDERR can be redirected to an arbitrary file
 #log_status_interval=300	 # interval (in seconds) for repmgrd to log a status message
 
 
@@ -136,6 +143,15 @@
 					# Debian/Ubuntu users: you will probably need to
 					# set this to the directory where `pg_ctl` is located,
 					# e.g. /usr/lib/postgresql/9.6/bin/
+					#
+					# *NOTE* "pg_bindir" is only used when repmgr directly
+					# executes PostgreSQL binaries; any user-defined scripts
+					# *must* be specified with the full path
+
+#repmgr_bindir=''			# Path to repmgr binary directory (location of the repmgr
+					# binary. Only needed if the repmgr executable is not in
+                                        # the system $PATH or the path defined in "pg_bindir".
+
 #use_primary_conninfo_password=false	# explicitly set "password" in recovery.conf's
 					# "primary_conninfo" parameter using the value contained
 					# in the environment variable PGPASSWORD
@@ -149,7 +165,7 @@
 # Examples:
 #
 #   pg_ctl_options='-s'
-#   pg_basebackup_options='--label=repmgr_backup
+#   pg_basebackup_options='--label=repmgr_backup'
 #   rsync_options=--archive --checksum --compress --progress --rsh="ssh -o \"StrictHostKeyChecking no\""
 #   ssh_options=-o "StrictHostKeyChecking no"
 
@@ -175,8 +191,15 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 					# file system location to another. This
 					# parameter can be provided multiple times.
 
-#restore_command=''			# This will be placed in the recovery.conf
-					# file generated by repmgr
+#restore_command=''			# This will be placed in the recovery.conf file generated
+					# by repmgr.
+
+#archive_cleanup_command=''		# This will be placed in the recovery.conf file generated
+					# by repmgr. Note we recommend using Barman for managing
+					# WAL archives (see: https://www.pgbarman.org )
+
+#recovery_min_apply_delay=		# If provided, "recovery_min_apply_delay" in recovery.conf
+					# will be set to this value (PostgreSQL 9.4 and later).
 
 
 #------------------------------------------------------------------------------
@@ -193,16 +216,42 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 
 
 #------------------------------------------------------------------------------
-# Standby follow settings
+# "standby follow" settings
 #------------------------------------------------------------------------------
 
 # These settings apply when instructing a standby to follow the new primary
 # ("repmgr standby follow").
 
-#primary_follow_timeout=60		# The length of time (in seconds) to wait
+#primary_follow_timeout=60		# The max length of time (in seconds) to wait
 					# for the new primary to become available
+#standby_follow_timeout=15		# The max length of time (in seconds) to wait
+					# for the standby to connect to the primary
 
 
+#------------------------------------------------------------------------------
+# "standby switchover" settings
+#------------------------------------------------------------------------------
+
+# These settings apply when switching roles between a primary and a standby
+# ("repmgr standby switchover").
+
+#shutdown_check_timeout=60		# The max length of time (in seconds) to wait for the demotion
+					# candidate (current primary) to shut down
+#standby_reconnect_timeout=60		# The max length of time (in seconds) to wait
+					# for the demoted standby to reconnect to the promoted
+					# primary (note: this value should be equal to or greater
+					# than that set for "node_rejoin_timeout")
+
+#------------------------------------------------------------------------------
+# "node rejoin" settings
+#------------------------------------------------------------------------------
+
+# These settings apply when reintegrating a node into a replication cluster
+# with "repmgrd_node_rejoin"
+
+#node_rejoin_timeout=60		# The maximum length of time (in seconds) to wait for
+					# the node to reconnect to the replication cluster
+
 #------------------------------------------------------------------------------
 # Barman options
 #------------------------------------------------------------------------------
@@ -220,6 +269,11 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 # These settings are only applied when repmgrd is running. Values shown
 # are defaults.
 
+#repmgrd_pid_file=			# Path of PID file to use for repmgrd; if not set, a PID file will
+					# be generated in a temporary directory specified by the environment
+					# variable $TMPDIR, or if not set, in "/tmp". This value can be overridden
+					# by the command line option "-p/--pid-file"; the command line option
+					# "--no-pid-file" will force PID file creation to be skipped.
 #failover=manual			# one of 'automatic', 'manual'.
 					# determines what action to take in the event of upstream failure
 					#
@@ -229,19 +283,19 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 					#    manual attention to reattach it to replication
 					# (does not apply to BDR mode)
 
-#priority=100				# indicate a preferred priorty for promoting nodes;
+#priority=100				# indicate a preferred priority for promoting nodes;
 					# a value of zero prevents the node being promoted to primary
 					# (default: 100)
 
-#reconnect_attempts=6			# Number attempts which will be made to reconnect to an unreachable
+#reconnect_attempts=6			# Number of attempts which will be made to reconnect to an unreachable
 					# primary (or other upstream node)
-#reconnect_interval=10			# Interval between attempts  to reconnect to an unreachable
+#reconnect_interval=10			# Interval between attempts to reconnect to an unreachable
 					# primary (or other upstream node)
-#promote_command=			# command to execute when promoting a new primary; use something like:
+#promote_command=			# command repmgrd executes when promoting a new primary; use something like:
 					#
 					#     repmgr standby promote -f /etc/repmgr.conf
 					#
-#follow_command=			# command to execute when instructing a standby to follow a new primary;
+#follow_command=			# command repmgrd executes when instructing a standby to follow a new primary;
 					# use something like:
 					#
 					#     repmgr standby follow -f /etc/repmgr.conf -W --upstream-node-id=%n
@@ -249,8 +303,9 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 #primary_notification_timeout=60	# Interval (in seconds) which repmgrd on a standby
 					# will wait for a notification from the new primary,
 					# before falling back to degraded monitoring
-#standby_reconnect_timeout=60	# Interval (in seconds) which repmgrd on a standby will wait
-					# to reconnect to the local node after executing "follow_command"
+#repmgrd_standby_startup_timeout=60	# Interval (in seconds) which repmgrd on a standby will wait
+					# for the the local node to restart and become ready to accept connections after
+					# executing "follow_command" (defaults to the value set in "standby_reconnect_timeout")
 
 #monitoring_history=no                  # Whether to write monitoring data to the "montoring_history" table
 #monitor_interval_secs=2                # Interval (in seconds) at which to write monitoring data
@@ -286,16 +341,19 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 #       /usr/bin/systemctl start postgresql-9.6, \
 #       /usr/bin/systemctl restart postgresql-9.6
 #
+# Debian/Ubuntu users: use "sudo pg_ctlcluster" to execute service control commands.
+#
+# For more details, see: https://repmgr.org/docs/4.1/configuration-service-commands.html
 
 #service_start_command = ''
 #service_stop_command = ''
 #service_restart_command = ''
 #service_reload_command = ''
-#service_promote_command = ''		# Note: this overrides any value contained in the setting
-					# "promote_command". This is intended for systems which
-					# provide a package-level promote command, such as Debian's
-					# "pg_ctlcluster"
-
+#service_promote_command = ''		# This parameter is intended for systems which provide a
+					# package-level promote command, such as Debian's
+					# "pg_ctlcluster". *IMPORTANT*: it is *not* a substitute
+					# for "promote_command"; do not use "repmgr standby promote"
+					# (or a script which executes "repmgr standby promote") here.
 
 #------------------------------------------------------------------------------
 # Status check thresholds
@@ -329,7 +387,7 @@ ssh_options='-q -o ConnectTimeout=10'	# Options to append to "ssh"
 #------------------------------------------------------------------------------
 
 #bdr_local_monitoring_only=false         # Only monitor the local node; no checks will be
-                                         # performed on the other node
+					 # performed on the other node
 #bdr_recovery_timeout                    # If a BDR node was offline and has become available
-                                         # maximum length of time in seconds to wait for the
-                                         # node to reconnect to the cluster
+					 # maximum length of time in seconds to wait for the
+					 # node to reconnect to the cluster

repmgr.control

@@ -1,6 +1,6 @@
 # repmgr extension
 comment = 'Replication manager for PostgreSQL'
-default_version = '4.0'
+default_version = '4.2'
 module_pathname = '$libdir/repmgr'
 relocatable = false
 schema = repmgr

repmgr.h

@@ -49,8 +49,11 @@
 #define REPLICATION_TYPE_BDR	  2
 
 #define UNKNOWN_SERVER_VERSION_NUM -1
+#define UNKNOWN_BDR_VERSION_NUM -1
+
 #define UNKNOWN_TIMELINE_ID -1
 #define UNKNOWN_SYSTEM_IDENTIFIER 0
+#define UNKNOWN_PID			-1
 
 #define NODE_NOT_FOUND		-1
 #define NO_UPSTREAM_NODE	-1
@@ -58,6 +61,8 @@
 
 #define VOTING_TERM_NOT_SET -1
 
+#define BDR2_REPLICATION_SET_NAME "repmgr"
+
 /*
  * various default values - ensure repmgr.conf.sample is update
  * if any of these are changed
@@ -70,6 +75,7 @@
 #define DEFAULT_ASYNC_QUERY_TIMEOUT          60  /* seconds */
 #define DEFAULT_PRIMARY_NOTIFICATION_TIMEOUT 60  /* seconds */
 #define DEFAULT_PRIMARY_FOLLOW_TIMEOUT       60  /* seconds */
+#define DEFAULT_STANDBY_FOLLOW_TIMEOUT       30  /* seconds */
 #define DEFAULT_BDR_RECOVERY_TIMEOUT         30  /* seconds */
 #define DEFAULT_ARCHIVE_READY_WARNING        16  /* WAL files */
 #define DEFAULT_ARCHIVE_READY_CRITICAL       128 /* WAL files */
@@ -79,7 +85,9 @@
 #define DEFAULT_WAIT_START                   30  /* seconds */
 #define DEFAULT_PROMOTE_CHECK_TIMEOUT        60  /* seconds */
 #define DEFAULT_PROMOTE_CHECK_INTERVAL       1   /* seconds */
+#define DEFAULT_SHUTDOWN_CHECK_TIMEOUT       60  /* seconds */
 #define DEFAULT_STANDBY_RECONNECT_TIMEOUT    60  /* seconds */
+#define DEFAULT_NODE_REJOIN_TIMEOUT          60  /* seconds */
 
 #ifndef RECOVERY_COMMAND_FILE
 #define RECOVERY_COMMAND_FILE "recovery.conf"

repmgr_version.h.in

@@ -1,3 +1,2 @@
 #define REPMGR_VERSION_DATE ""
-#define REPMGR_VERSION "4.0.4"
-
+#define REPMGR_VERSION "4.2"

repmgrd-bdr.c

@@ -150,7 +150,13 @@ monitor_bdr(void)
 	 * retrieve list of all nodes - we'll need these if the DB connection goes
 	 * away
 	 */
-	get_all_node_records(local_conn, &nodes);
+	if (get_all_node_records(local_conn, &nodes) == false)
+	{
+		/* get_all_node_records() will display the error */
+		PQfinish(local_conn);
+		exit(ERR_BAD_CONFIG);
+	}
+
 
 	/* we're expecting all (both) nodes to be up */
 	for (cell = nodes.head; cell; cell = cell->next)
@@ -214,7 +220,8 @@ monitor_bdr(void)
 
 								log_warning(_("unable to connect to node %s (ID %i)"),
 											cell->node_info->node_name, cell->node_info->node_id);
-								cell->node_info->conn = try_reconnect(cell->node_info);
+								//cell->node_info->conn = try_reconnect(cell->node_info);
+								try_reconnect(&cell->node_info->conn, cell->node_info);
 
 								/* node has recovered - log and continue */
 								if (cell->node_info->node_status == NODE_STATUS_UP)
@@ -293,7 +300,7 @@ loop:
 			/*
 			 * if we can reload, then could need to change local_conn
 			 */
-			if (reload_config(&config_file_options))
+			if (reload_config(&config_file_options, BDR))
 			{
 				PQfinish(local_conn);
 				local_conn = establish_db_connection(config_file_options.conninfo, true);
@@ -303,11 +310,12 @@ loop:
 			got_SIGHUP = false;
 		}
 
+		/* XXX this looks like it will never be called */
 		if (got_SIGHUP)
 		{
 			log_debug("SIGHUP received");
 
-			if (reload_config(&config_file_options))
+			if (reload_config(&config_file_options, BDR))
 			{
 				PQfinish(local_conn);
 				local_conn = establish_db_connection(config_file_options.conninfo, true);

repmgrd-physical.h

@@ -24,7 +24,6 @@ void		do_physical_node_check(void);
 void		monitor_streaming_primary(void);
 void		monitor_streaming_standby(void);
 void		monitor_streaming_witness(void);
-void		close_connections_physical(void);
 
 void		handle_sigint_physical(SIGNAL_ARGS);
 

repmgrd.c

@@ -35,8 +35,10 @@
 
 static char *config_file = NULL;
 static bool verbose = false;
-static char *pid_file = NULL;
-static bool daemonize = false;
+char pid_file[MAXPGPATH];
+static bool daemonize = true;
+static bool show_pid_file = false;
+static bool no_pid_file = false;
 
 t_configuration_options config_file_options = T_CONFIGURATION_OPTIONS_INITIALIZER;
 
@@ -53,9 +55,6 @@ bool		startup_event_logged = false;
 MonitoringState monitoring_state = MS_NORMAL;
 instr_time	degraded_monitoring_start;
 
-static void close_connections(void);
-void		(*_close_connections) (void) = NULL;
-
 /*
  * Record receipt of SIGHUP; will cause configuration file to be reread
  * at the appropriate point in the main loop.
@@ -102,8 +101,11 @@ main(int argc, char **argv)
 		{"config-file", required_argument, NULL, 'f'},
 
 /* daemon options */
-		{"daemonize", no_argument, NULL, 'd'},
+		{"daemonize-short", optional_argument, NULL, 'd'},
+		{"daemonize", optional_argument, NULL, OPT_DAEMONIZE},
 		{"pid-file", required_argument, NULL, 'p'},
+		{"show-pid-file", no_argument, NULL, 's'},
+		{"no-pid-file", no_argument, NULL, OPT_NO_PID_FILE},
 
 /* logging options */
 		{"log-level", required_argument, NULL, 'L'},
@@ -116,8 +118,6 @@ main(int argc, char **argv)
 
 	set_progname(argv[0]);
 
-	srand(time(NULL));
-
 	/* Disallow running as root */
 	if (geteuid() == 0)
 	{
@@ -131,6 +131,10 @@ main(int argc, char **argv)
 		exit(1);
 	}
 
+	srand(time(NULL));
+
+	memset(pid_file, 0, MAXPGPATH);
+
 	while ((c = getopt_long(argc, argv, "?Vf:L:vdp:m", long_options, &optindex)) != -1)
 	{
 		switch (c)
@@ -175,8 +179,20 @@ main(int argc, char **argv)
 				daemonize = true;
 				break;
 
+			case OPT_DAEMONIZE:
+				daemonize = parse_bool(optarg, "-d/--daemonize", &cli_errors);
+				break;
+
 			case 'p':
-				pid_file = optarg;
+				strncpy(pid_file, optarg, MAXPGPATH);
+				break;
+
+			case 's':
+				show_pid_file = true;
+				break;
+
+			case OPT_NO_PID_FILE:
+				no_pid_file = true;
 				break;
 
 				/* logging options */
@@ -223,7 +239,7 @@ main(int argc, char **argv)
 	/* Exit here already if errors in command line options found */
 	if (cli_errors.head != NULL)
 	{
-		exit_with_cli_errors(&cli_errors);
+		exit_with_cli_errors(&cli_errors, NULL);
 	}
 
 	startup_event_logged = false;
@@ -242,6 +258,58 @@ main(int argc, char **argv)
 	 */
 	load_config(config_file, verbose, false, &config_file_options, argv[0]);
 
+	/* Determine pid file location, unless --no-pid-file supplied */
+
+	if (no_pid_file == false)
+	{
+		if (config_file_options.repmgrd_pid_file[0] != '\0')
+		{
+			if (pid_file[0] != '\0')
+			{
+				log_warning(_("\"repmgrd_pid_file\" will be overridden by --pid-file"));
+			}
+			else
+			{
+				strncpy(pid_file, config_file_options.repmgrd_pid_file, MAXPGPATH);
+			}
+		}
+
+		/* no pid file provided - determine location */
+		if (pid_file[0] == '\0')
+		{
+			/* packagers: if feasible, patch PID file path into "package_pid_file" */
+			char		package_pid_file[MAXPGPATH] = "";
+
+			if (package_pid_file[0] != '\0')
+			{
+				maxpath_snprintf(pid_file, "%s", package_pid_file);
+			}
+			else
+			{
+				const char *tmpdir = getenv("TMPDIR");
+
+				if (!tmpdir)
+					tmpdir = "/tmp";
+
+				maxpath_snprintf(pid_file, "%s/repmgrd.pid", tmpdir);
+			}
+		}
+	}
+	else
+	{
+		/* --no-pid-file supplied - overwrite any value provided with --pid-file ... */
+		memset(pid_file, 0, MAXPGPATH);
+	}
+
+
+	/* If --show-pid-file supplied, output the location (if set) and exit */
+
+	if (show_pid_file == true)
+	{
+		printf("%s\n", pid_file);
+		exit(SUCCESS);
+	}
+
 
 	/* Some configuration file items can be overriden by command line options */
 
@@ -254,8 +322,6 @@ main(int argc, char **argv)
 		strncpy(config_file_options.log_level, cli_log_level, MAXLEN);
 	}
 
-	log_notice(_("repmgrd (repmgr %s) starting up"), REPMGR_VERSION);
-
 	/*
 	 * -m/--monitoring-history, if provided, will override repmgr.conf's
 	 * monitoring_history; this is for backwards compatibility as it's
@@ -283,6 +349,8 @@ main(int argc, char **argv)
 
 	logger_init(&config_file_options, progname());
 
+	log_notice(_("repmgrd (%s %s) starting up"), progname(), REPMGR_VERSION);
+
 	if (verbose)
 		logger_set_verbose();
 
@@ -330,7 +398,7 @@ main(int argc, char **argv)
 		{
 			log_error(_("unable to determine status of \"repmgr\" extension"));
 			log_detail("%s", PQerrorMessage(local_conn));
-			PQfinish(local_conn);
+			close_connection(&local_conn);
 			exit(ERR_DB_QUERY);
 		}
 
@@ -347,7 +415,7 @@ main(int argc, char **argv)
 		}
 
 		log_hint(_("check that this node is part of a repmgr cluster"));
-		PQfinish(local_conn);
+		close_connection(&local_conn);
 		exit(ERR_BAD_CONFIG);
 	}
 
@@ -373,7 +441,7 @@ main(int argc, char **argv)
 				break;
 		}
 
-		PQfinish(local_conn);
+		close_connection(&local_conn);
 		terminate(ERR_BAD_CONFIG);
 	}
 
@@ -392,7 +460,7 @@ main(int argc, char **argv)
 		{
 			log_error(_("unable to write to shared memory"));
 			log_hint(_("ensure \"shared_preload_libraries\" includes \"repmgr\""));
-			PQfinish(local_conn);
+			close_connection(&local_conn);
 			terminate(ERR_BAD_CONFIG);
 		}
 	}
@@ -404,7 +472,6 @@ main(int argc, char **argv)
 	}
 	else
 	{
-		_close_connections = close_connections_physical;
 		log_debug("node id is %i, upstream node id is %i",
 				  local_node_info.node_id,
 				  local_node_info.upstream_node_id);
@@ -418,11 +485,14 @@ main(int argc, char **argv)
 		daemonize_process();
 	}
 
-	if (pid_file != NULL)
+	if (pid_file[0] != '\0')
 	{
 		check_and_create_pid_file(pid_file);
 	}
 
+	repmgrd_set_pid(local_conn, getpid(), pid_file);
+
+
 #ifndef WIN32
 	setup_event_handlers();
 #endif
@@ -673,6 +743,8 @@ show_help(void)
 {
 	printf(_("%s: replication management daemon for PostgreSQL\n"), progname());
 	puts("");
+	printf(_("%s monitors a cluster of servers and optionally performs failover.\n"), progname());
+	puts("");
 
 	printf(_("Usage:\n"));
 	printf(_("  %s [OPTIONS]\n"), progname());
@@ -692,30 +764,44 @@ show_help(void)
 
 	puts("");
 
-	printf(_("General configuration options:\n"));
-	printf(_("  -d, --daemonize           detach process from foreground\n"));
-	printf(_("  -p, --pid-file=PATH       write a PID file\n"));
+	printf(_("Daemon configuration options:\n"));
+	printf(_("  -d\n"));
+	printf(_("  --daemonize[=true/false]\n"));
+	printf(_("                            detach process from foreground (default: true)\n"));
+	printf(_("  -p, --pid-file=PATH       use the specified PID file\n"));
+	printf(_("  -s, --show-pid-file       show PID file which would be used by the current configuration\n"));
+	printf(_("  --no-pid-file             don't write a PID file\n"));
 	puts("");
 
-	printf(_("%s monitors a cluster of servers and optionally performs failover.\n"), progname());
 }
 
 
-PGconn *
-try_reconnect(t_node_info *node_info)
+void
+try_reconnect(PGconn **conn, t_node_info *node_info)
 {
-	PGconn	   *conn;
+	PGconn	   *our_conn;
+	t_conninfo_param_list conninfo_params = T_CONNINFO_PARAM_LIST_INITIALIZER;
 
 	int			i;
 
 	int			max_attempts = config_file_options.reconnect_attempts;
 
+	initialize_conninfo_params(&conninfo_params, false);
+
+	/* we assume by now the conninfo string is parseable */
+	(void) parse_conninfo_string(node_info->conninfo, &conninfo_params, NULL, false);
+
+	/* set some default values if not explicitly provided */
+	param_set_ine(&conninfo_params, "connect_timeout", "2");
+	param_set_ine(&conninfo_params, "fallback_application_name", "repmgr");
+
 	for (i = 0; i < max_attempts; i++)
 	{
 		log_info(_("checking state of node %i, %i of %i attempts"),
 				 node_info->node_id, i + 1, max_attempts);
-		if (is_server_available(node_info->conninfo) == true)
+		if (is_server_available_params(&conninfo_params) == true)
 		{
+
 			log_notice(_("node has recovered, reconnecting"));
 
 			/*
@@ -723,15 +809,48 @@ try_reconnect(t_node_info *node_info)
 			 * connection denied due to connection exhaustion - fall back to
 			 * degraded monitoring? - make that configurable
 			 */
-			conn = establish_db_connection(node_info->conninfo, false);
-			if (PQstatus(conn) == CONNECTION_OK)
+
+			our_conn = establish_db_connection_by_params(&conninfo_params, false);
+
+			if (PQstatus(our_conn) == CONNECTION_OK)
 			{
+				free_conninfo_params(&conninfo_params);
+
+				log_info(_("connection to node %i succeeded"), node_info->node_id);
+
+				if (PQstatus(*conn) == CONNECTION_BAD)
+				{
+					log_verbose(LOG_INFO, "original connection handle returned CONNECTION_BAD, using new connection");
+					close_connection(conn);
+					*conn = our_conn;
+				}
+				else
+				{
+					ExecStatusType ping_result;
+
+					ping_result = connection_ping(*conn);
+
+					if (ping_result != PGRES_TUPLES_OK)
+					{
+						log_info("original connnection no longer available, using new connection");
+						close_connection(conn);
+						*conn = our_conn;
+					}
+					else
+					{
+						log_info(_("original connection is still available"));
+
+						PQfinish(our_conn);
+					}
+				}
+
 				node_info->node_status = NODE_STATUS_UP;
-				return conn;
+
+				return;
 			}
 
-			PQfinish(conn);
-			log_notice(_("unable to reconnect to node"));
+			close_connection(&our_conn);
+			log_notice(_("unable to reconnect to node %i"), node_info->node_id);
 		}
 
 		if (i + 1 < max_attempts)
@@ -742,14 +861,15 @@ try_reconnect(t_node_info *node_info)
 		}
 	}
 
-
 	log_warning(_("unable to reconnect to node %i after %i attempts"),
 				node_info->node_id,
 				max_attempts);
 
 	node_info->node_status = NODE_STATUS_DOWN;
 
-	return NULL;
+	free_conninfo_params(&conninfo_params);
+
+	return;
 }
 
 
@@ -784,27 +904,15 @@ print_monitoring_state(MonitoringState monitoring_state)
 }
 
 
-static void
-close_connections()
-{
-	if (_close_connections != NULL)
-		_close_connections();
-
-	if (local_conn != NULL && PQstatus(local_conn) == CONNECTION_OK)
-	{
-		PQfinish(local_conn);
-		local_conn = NULL;
-	}
-
-}
-
 void
 terminate(int retval)
 {
-	close_connections();
+	if (PQstatus(local_conn)  == CONNECTION_OK)
+		repmgrd_set_pid(local_conn, UNKNOWN_PID, NULL);
+
 	logger_shutdown();
 
-	if (pid_file)
+	if (pid_file[0] != '\0')
 	{
 		unlink(pid_file);
 	}

repmgrd.h

@@ -10,6 +10,9 @@
 #include <time.h>
 #include "portability/instr_time.h"
 
+#define OPT_NO_PID_FILE                  1000
+#define OPT_DAEMONIZE                    1001
+
 extern volatile sig_atomic_t got_SIGHUP;
 extern MonitoringState monitoring_state;
 extern instr_time degraded_monitoring_start;
@@ -18,12 +21,15 @@ extern t_configuration_options config_file_options;
 extern t_node_info local_node_info;
 extern PGconn *local_conn;
 extern bool startup_event_logged;
+extern char pid_file[MAXPGPATH];
 
-PGconn	   *try_reconnect(t_node_info *node_info);
+void		try_reconnect(PGconn **conn, t_node_info *node_info);
 
 int			calculate_elapsed(instr_time start_time);
 const char *print_monitoring_state(MonitoringState monitoring_state);
 
 void		update_registration(PGconn *conn);
 void		terminate(int retval);
+
+
 #endif							/* _REPMGRD_H_ */

strutil.c

@@ -87,17 +87,17 @@ append_where_clause(PQExpBufferData *where_clause, const char *format,...)
 
 	if (where_clause->data[0] == '\0')
 	{
-		appendPQExpBuffer(where_clause,
-						  " WHERE ");
+		appendPQExpBufferStr(where_clause,
+							 " WHERE ");
 	}
 	else
 	{
-		appendPQExpBuffer(where_clause,
-						  " AND ");
+		appendPQExpBufferStr(where_clause,
+							 " AND ");
 	}
 
-	appendPQExpBuffer(where_clause,
-					  "%s", stringbuf);
+	appendPQExpBufferStr(where_clause,
+						 stringbuf);
 
 }