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c7f49541a3a0a9fdcad7a75d8b9868a0fe8769be
repmgr/repmgr-action-standby.c
Ian Barwick c7f49541a3 Add "standby unregister"
2017-05-08 23:37:53 +09:00

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/*
* repmgr-action-standby.c
*
* Implements standby actions for the repmgr command line utility
*
* Copyright (c) 2ndQuadrant, 2010-2017
*/
#include <sys/stat.h>
#include "repmgr.h"
#include "dirutil.h"
#include "compat.h"
#include "repmgr-client-global.h"
#include "repmgr-action-standby.h"
typedef struct TablespaceDataListCell
{
struct TablespaceDataListCell *next;
char *name;
char *oid;
char *location;
/* optional payload */
FILE *f;
} TablespaceDataListCell;
typedef struct TablespaceDataList
{
TablespaceDataListCell *head;
TablespaceDataListCell *tail;
} TablespaceDataList;
struct BackupLabel
{
XLogRecPtr start_wal_location;
char start_wal_file[MAXLEN];
XLogRecPtr checkpoint_location;
char backup_from[MAXLEN];
char backup_method[MAXLEN];
char start_time[MAXLEN];
char label[MAXLEN];
XLogRecPtr min_failover_slot_lsn;
};
static PGconn *primary_conn = NULL;
static PGconn *source_conn = NULL;
static int server_version_num = UNKNOWN_SERVER_VERSION_NUM;
static char local_data_directory[MAXPGPATH];
static bool local_data_directory_provided = false;
static bool upstream_record_found = false;
static int upstream_node_id = UNKNOWN_NODE_ID;
static char upstream_data_directory[MAXPGPATH];
static t_conninfo_param_list recovery_conninfo;
static char recovery_conninfo_str[MAXLEN];
static t_configfile_list config_files = T_CONFIGFILE_LIST_INITIALIZER;
static standy_clone_mode mode;
// XXX these aren't actually used after being set... remove if no purpose can be found
static char *first_wal_segment = NULL;
static char *last_wal_segment = NULL;
static bool pg_start_backup_executed = false;
static struct BackupLabel backup_label;
/* used by barman mode */
static char local_repmgr_tmp_directory[MAXPGPATH];
static char datadir_list_filename[MAXLEN];
static char barman_command_buf[MAXLEN] = "";
static void check_barman_config(void);
static void check_source_server(void);
static void check_source_server_via_barman(void);
static void check_master_standby_version_match(PGconn *conn, PGconn *master_conn);
static void initialise_direct_clone(void);
static void config_file_list_init(t_configfile_list *list, int max_size);
static void config_file_list_add(t_configfile_list *list, const char *file, const char *filename, bool in_data_dir);
static void copy_configuration_files(void);
static void cleanup_data_directory(void);
static int run_basebackup(void);
static int run_file_backup(void);
static bool read_backup_label(const char *local_data_directory, struct BackupLabel *out_backup_label);
static void parse_lsn(XLogRecPtr *ptr, const char *str);
static XLogRecPtr parse_label_lsn(const char *label_key, const char *label_value);
static int get_tablespace_data(PGconn *upstream_conn, TablespaceDataList *list);
static void tablespace_data_append(TablespaceDataList *list, const char *name, const char *oid, const char *location);
static void get_barman_property(char *dst, char *name, char *local_repmgr_directory);
static int get_tablespace_data_barman(char *, TablespaceDataList *);
static char *make_barman_ssh_command(char *buf);
void
do_standby_clone(void)
{
PQExpBufferData event_details;
int r;
/*
* conninfo params for the actual upstream node (which might be different
* to the node we're cloning from) to write to recovery.conf
*/
mode = get_standby_clone_mode();
/*
* In rsync mode, we need to check the SSH connection early
*/
if (mode == rsync)
{
r = test_ssh_connection(runtime_options.host, runtime_options.remote_user);
if (r != 0)
{
log_error(_("remote host %s is not reachable via SSH"),
runtime_options.host);
exit(ERR_BAD_SSH);
}
}
/*
* If a data directory (-D/--pgdata) was provided, use that, otherwise
* repmgr will default to using the same directory path as on the source
* host.
*
* Note that barman mode requires -D/--pgdata.
*
* If -D/--pgdata is not supplied, and we're not cloning from barman,
* the source host's data directory will be fetched later, after
* we've connected to it.
*/
if (runtime_options.data_dir[0])
{
local_data_directory_provided = true;
log_notice(_("destination directory \"%s\" provided"),
runtime_options.data_dir);
}
else if (mode == barman)
{
log_error(_("Barman mode requires a data directory"));
log_hint(_("use -D/--pgdata to explicitly specify a data directory"));
exit(ERR_BAD_CONFIG);
}
/*
* target directory (-D/--pgdata) provided - use that as new data directory
* (useful when executing backup on local machine only or creating the backup
* in a different local directory when backup source is a remote host)
*/
if (local_data_directory_provided == true)
{
strncpy(local_data_directory, runtime_options.data_dir, MAXPGPATH);
}
/* Sanity-check barman connection and installation */
if (mode == barman)
{
/* this will exit with ERR_BARMAN if problems found */
check_barman_config();
}
/*
* Initialise list of conninfo parameters which will later be used
* to create the `primary_conninfo` string in recovery.conf .
*
* We'll initialise it with the default values as seen by libpq,
* and overwrite them with the host settings specified on the command
* line. As it's possible the standby will be cloned from a node different
* to its intended upstream, we'll later attempt to fetch the
* upstream node record and overwrite the values set here with
* those from the upstream node record (excluding that record's
* application_name)
*/
initialize_conninfo_params(&recovery_conninfo, true);
copy_conninfo_params(&recovery_conninfo, &source_conninfo);
/* Set the default application name to this node's name */
param_set(&recovery_conninfo, "application_name", config_file_options.node_name);
/*
* If application_name is set in repmgr.conf's conninfo parameter, use
* this value (if the source host was provided as a conninfo string, any
* application_name values set there will be overridden; we assume the only
* reason to pass an application_name via the command line is in the
* rare corner case where a user wishes to clone a server without
* providing repmgr.conf)
*/
if (strlen(config_file_options.conninfo))
{
char application_name[MAXLEN] = "";
get_conninfo_value(config_file_options.conninfo, "application_name", application_name);
if (strlen(application_name))
{
param_set(&recovery_conninfo, "application_name", application_name);
}
}
/*
* --upstream-conninfo supplied, which we interpret to imply
* --no-upstream-connection as well - the use case for this option is when
* the upstream is not available, so no point in checking for it.
*
* XXX not sure of the logic here (and yes I did think this up)
* - we'll need the source connection in any case, just won't connect
* to the "upstream_conninfo" server. We'd probably need to
* to override "no_upstream_connection" if connection params
* actually provided.
*/
if (*runtime_options.upstream_conninfo)
runtime_options.no_upstream_connection = false;
/* By default attempt to connect to the source server */
if (runtime_options.no_upstream_connection == false)
{
check_source_server();
}
if (mode == barman && PQstatus(source_conn) != CONNECTION_OK)
{
/*
* Here we don't have a connection to the upstream node, and are executing
* in Barman mode - we can try and connect via the Barman server to extract
* the upstream node's conninfo string.
*
* To do this we need to extract Barman's conninfo string, replace the database
* name with the repmgr one (they could well be different) and remotely execute
* psql.
*/
check_source_server_via_barman();
}
if (upstream_record_found == true)
{
/* parse returned upstream conninfo string to recovery primary_conninfo params*/
char *errmsg = NULL;
bool parse_success;
log_verbose(LOG_DEBUG, "parsing upstream conninfo string \"%s\"", recovery_conninfo_str);
/* parse_conninfo_string() here will remove the upstream's `application_name`, if set */
parse_success = parse_conninfo_string(recovery_conninfo_str, &recovery_conninfo, errmsg, true);
if (parse_success == false)
{
log_error(_("unable to parse conninfo string \"%s\" for upstream node:\n%s"),
recovery_conninfo_str, errmsg);
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
}
else
{
/*
* If no upstream node record found, we'll abort with an error here,
* unless -F/--force is used, in which case we'll use the parameters
* provided on the command line (and assume the user knows what they're
* doing).
*/
if (!runtime_options.force)
{
log_error(_("no record found for upstream node (upstream_node_id: %i)"),
upstream_node_id);
log_hint(_("use -F/--force to create \"primary_conninfo\" based on command-line parameters"));
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
}
/* If --replication-user was set, use that value for the primary_conninfo user */
if (*runtime_options.replication_user)
{
param_set(&recovery_conninfo, "user", runtime_options.replication_user);
}
if (mode != barman)
{
initialise_direct_clone();
}
switch (mode)
{
case rsync:
log_notice(_("starting backup (using rsync)..."));
break;
case pg_basebackup:
log_notice(_("starting backup (using pg_basebackup)..."));
break;
case barman:
log_notice(_("getting backup from Barman..."));
break;
default:
/* should never reach here */
log_error(_("unknown clone mode"));
}
if (mode == pg_basebackup || mode == rsync)
{
if (runtime_options.fast_checkpoint == false)
{
log_hint(_("this may take some time; consider using the -c/--fast-checkpoint option"));
}
}
if (mode == pg_basebackup)
{
r = run_basebackup();
}
else
{
r = run_file_backup();
}
/* If the backup failed then exit */
if (r != 0)
{
/* If a replication slot was previously created, drop it */
if (config_file_options.use_replication_slots)
{
drop_replication_slot(source_conn, repmgr_slot_name);
}
log_error(_("unable to take a base backup of the master server"));
log_warning(_("data directory (%s) may need to be cleaned up manually"),
local_data_directory);
PQfinish(source_conn);
exit(r);
}
/*
* If `--copy-external-config-files` was provided, copy any configuration
* files detected to the appropriate location. Any errors encountered
* will not be treated as fatal.
*
* XXX check this won't run in Barman mode
*/
if (runtime_options.copy_external_config_files && config_files.entries)
{
copy_configuration_files();
}
/* Write the recovery.conf file */
create_recovery_file(local_data_directory, &recovery_conninfo);
switch(mode)
{
case rsync:
log_notice(_("standby clone (using rsync) complete"));
break;
case pg_basebackup:
log_notice(_("standby clone (using pg_basebackup) complete"));
break;
case barman:
log_notice(_("standby clone (from Barman) complete"));
break;
}
/*
* XXX It might be nice to provide an options to have repmgr start
* the PostgreSQL server automatically (e.g. with a custom pg_ctl
* command)
*/
log_notice(_("you can now start your PostgreSQL server"));
if (*config_file_options.service_start_command)
{
log_hint(_("for example : %s"),
config_file_options.service_start_command);
}
else if (local_data_directory_provided)
{
log_hint(_("for example : pg_ctl -D %s start"),
local_data_directory);
}
else
{
log_hint(_("for example : /etc/init.d/postgresql start"));
}
/*
* XXX forgetting to (re) register the standby is a frequent cause
* of error; we should consider having repmgr automatically
* register the standby, either by default with an option
* "--no-register", or an option "--register".
*
* Note that "repmgr standby register" requires the standby to
* be running - if not, and we just update the node record,
* we'd have an incorrect representation of the replication cluster.
* Best combined with an automatic start of the server (see note
* above)
*/
/*
* XXX detect whether a record exists for this node already, and
* add a hint about using the -F/--force.
*/
log_hint(_("after starting the server, you need to register this standby with \"repmgr standby register\""));
/* Log the event */
initPQExpBuffer(&event_details);
/* Add details about relevant runtime options used */
appendPQExpBuffer(&event_details,
_("Cloned from host '%s', port %s"),
runtime_options.host,
runtime_options.port);
appendPQExpBuffer(&event_details,
_("; backup method: "));
switch(mode)
{
case rsync:
appendPQExpBuffer(&event_details, "rsync");
break;
case pg_basebackup:
appendPQExpBuffer(&event_details, "pg_basebackup");
break;
case barman:
appendPQExpBuffer(&event_details, "barman");
break;
}
appendPQExpBuffer(&event_details,
_("; --force: %s"),
runtime_options.force ? "Y" : "N");
create_event_record(primary_conn,
&config_file_options,
config_file_options.node_id,
"standby_clone",
true,
event_details.data);
if (PQstatus(primary_conn) == CONNECTION_OK)
PQfinish(primary_conn);
if (PQstatus(source_conn) == CONNECTION_OK)
PQfinish(source_conn);
exit(r);
}
void
check_barman_config(void)
{
char command[MAXLEN];
bool command_ok;
/*
* Check that there is at least one valid backup
*/
log_info(_("connecting to Barman server to verify backup for %s"), config_file_options.barman_server);
maxlen_snprintf(command, "%s show-backup %s latest > /dev/null",
make_barman_ssh_command(barman_command_buf),
config_file_options.barman_server);
command_ok = local_command(command, NULL);
if (command_ok == false)
{
log_error(_("no valid backup for server %s was found in the Barman catalogue"),
config_file_options.barman_server);
log_hint(_("refer to the Barman documentation for more information"));
exit(ERR_BARMAN);
}
if (!create_pg_dir(local_data_directory, runtime_options.force))
{
log_error(_("unable to use directory %s"),
local_data_directory);
log_hint(_("use -F/--force option to force this directory to be overwritten"));
exit(ERR_BAD_CONFIG);
}
/*
* Create the local repmgr subdirectory
*/
maxlen_snprintf(local_repmgr_tmp_directory,
"%s/repmgr", local_data_directory);
maxlen_snprintf(datadir_list_filename,
"%s/data.txt", local_repmgr_tmp_directory);
if (!create_pg_dir(local_repmgr_tmp_directory, runtime_options.force))
{
log_error(_("unable to create directory \"%s\""),
local_repmgr_tmp_directory);
exit(ERR_BAD_CONFIG);
}
/*
* Fetch server parameters from Barman
*/
log_info(_("connecting to Barman server to fetch server parameters"));
maxlen_snprintf(command, "%s show-server %s > %s/show-server.txt",
make_barman_ssh_command(barman_command_buf),
config_file_options.barman_server,
local_repmgr_tmp_directory);
command_ok = local_command(command, NULL);
if (command_ok == false)
{
log_error(_("unable to fetch server parameters from Barman server"));
exit(ERR_BARMAN);
}
}
void
do_standby_register(void)
{
PGconn *conn;
PGconn *master_conn;
int ret;
bool record_created;
t_node_info node_record = T_NODE_INFO_INITIALIZER;
int node_result;
log_info(_("connecting to standby database"));
conn = establish_db_connection_quiet(config_file_options.conninfo);
if (PQstatus(conn) != CONNECTION_OK)
{
if (!runtime_options.force)
{
log_error(_("unable to connect to local node %i (\"%s\"):"),
config_file_options.node_id,
config_file_options.node_name);
log_detail(_("%s"),
PQerrorMessage(conn));
log_hint(_("to register a standby which is not running, provide master connection parameters and use option -F/--force"));
exit(ERR_BAD_CONFIG);
}
if (!runtime_options.connection_param_provided)
{
log_error(_("unable to connect to local node %i (\"%s\") and no master connection parameters provided"),
config_file_options.node_id,
config_file_options.node_name);
exit(ERR_BAD_CONFIG);
}
}
if (PQstatus(conn) == CONNECTION_OK)
{
ret = is_standby(conn);
if (ret == 0 || ret == -1)
{
log_error(_(ret == 0 ? "this node should be a standby (%s)" :
"connection to node (%s) lost"), config_file_options.conninfo);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
}
/* check if there is a master in this cluster */
log_info(_("connecting to master database"));
/* Normal case - we can connect to the local node */
if (PQstatus(conn) == CONNECTION_OK)
{
master_conn = get_master_connection(conn, NULL, NULL);
}
/* User is forcing a registration and must have supplied master connection info */
else
{
master_conn = establish_db_connection_by_params((const char**)source_conninfo.keywords,
(const char**)source_conninfo.values,
false);
}
/*
* no amount of --force will make it possible to register the standby
* without a master server to connect to
*/
if (PQstatus(master_conn) != CONNECTION_OK)
{
log_error(_("unable to connect to the master database"));
log_hint(_("a master must be configured before registering a standby"));
exit(ERR_BAD_CONFIG);
}
/*
* Verify that standby and master are supported and compatible server
* versions
*
* If the user is registering an inactive standby, we'll trust they know
* what they're doing
*/
if (PQstatus(conn) == CONNECTION_OK)
{
check_master_standby_version_match(conn, master_conn);
}
/*
* Check that an active node with the same node_name doesn't exist already
*/
node_result = get_node_record_by_name(master_conn,
config_file_options.node_name,
&node_record);
if (node_result)
{
if (node_record.active == true)
{
log_error(_("node %i exists already with node_name \"%s\""),
node_record.node_id,
config_file_options.node_name);
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
}
/* Check if node record exists */
node_result = get_node_record(master_conn,
config_file_options.node_id,
&node_record);
if (node_result && !runtime_options.force)
{
log_error(_("node %i is already registered"),
config_file_options.node_id);
log_hint(_("use option -F/--force to overwrite an existing node record"));
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/*
* If an upstream node is defined, check if that node exists and is active
* If it doesn't exist, and --force set, create a minimal inactive record
*/
if (config_file_options.upstream_node_id != NO_UPSTREAM_NODE)
{
int upstream_node_result;
upstream_node_result = get_node_record(master_conn,
config_file_options.upstream_node_id,
&node_record);
if (!upstream_node_result)
{
t_node_info upstream_node_record = T_NODE_INFO_INITIALIZER;
if (!runtime_options.force)
{
log_error(_("no record found for upstream node %i"),
config_file_options.upstream_node_id);
/* footgun alert - only do this if you know what you're doing */
log_hint(_("use option -F/--force to create a dummy upstream record"));
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
log_notice(_("creating placeholder record for upstream node %i"),
config_file_options.upstream_node_id);
upstream_node_record.node_id = config_file_options.upstream_node_id;
upstream_node_record.type = STANDBY;
upstream_node_record.upstream_node_id = NO_UPSTREAM_NODE;
strncpy(upstream_node_record.conninfo, runtime_options.upstream_conninfo, MAXLEN);
upstream_node_record.active = false;
record_created = create_node_record(master_conn,
"standby register",
&upstream_node_record);
/*
* It's possible, in the kind of scenario this functionality is intended
* to support, that there's a race condition where the node's actual
* record gets inserted, causing the insert of the placeholder record
* to fail. If this is the case, we don't worry about this insert failing;
* if not we bail out.
*
* TODO: teach create_node_record() to use ON CONFLICT DO NOTHING for
* 9.5 and later.
*/
if (record_created == false)
{
upstream_node_result = get_node_record(master_conn,
config_file_options.upstream_node_id,
&node_record);
if (!upstream_node_result)
{
log_error(_("unable to create placeholder record for upstream node %i"),
config_file_options.upstream_node_id);
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
log_info(_("a record for upstream node %i was already created"),
config_file_options.upstream_node_id);
}
}
else if (node_record.active == false)
{
/*
* upstream node is inactive and --force not supplied - refuse to register
*/
if (!runtime_options.force)
{
log_error(_("record for upstream node %i is marked as inactive"),
config_file_options.upstream_node_id);
log_hint(_("use option -F/--force to register a standby with an inactive upstream node"));
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/*
* user is using the --force - notify about the potential footgun
*/
log_notice(_("registering node %i with inactive upstream node %i"),
config_file_options.node_id,
config_file_options.upstream_node_id);
}
}
/* populate node record structure */
node_record.node_id = config_file_options.node_id;
node_record.type = STANDBY;
node_record.upstream_node_id = config_file_options.upstream_node_id;
node_record.priority = config_file_options.priority;
node_record.active = true;
strncpy(node_record.node_name, config_file_options.node_name, MAXLEN);
strncpy(node_record.conninfo, config_file_options.conninfo, MAXLEN);
if (repmgr_slot_name_ptr != NULL)
strncpy(node_record.slot_name, repmgr_slot_name_ptr, MAXLEN);
/*
* node record exists - update it
* (at this point we have already established that -F/--force is in use)
*/
if (node_result)
{
record_created = update_node_record(master_conn,
"standby register",
&node_record);
}
else
{
record_created = create_node_record(master_conn,
"standby register",
&node_record);
}
if (record_created == false)
{
/* XXX add event description */
create_event_record(master_conn,
&config_file_options,
config_file_options.node_id,
"standby_register",
false,
NULL);
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Log the event */
create_event_record(master_conn,
&config_file_options,
config_file_options.node_id,
"standby_register",
true,
NULL);
/* if --wait-sync option set, wait for the records to synchronise */
if (PQstatus(conn) == CONNECTION_OK &&
runtime_options.wait_register_sync == true &&
runtime_options.wait_register_sync_seconds > 0)
{
bool sync_ok = false;
int timer = 0;
int node_record_result;
t_node_info node_record_on_master = T_NODE_INFO_INITIALIZER;
t_node_info node_record_on_standby = T_NODE_INFO_INITIALIZER;
node_record_result = get_node_record(master_conn,
config_file_options.node_id,
&node_record_on_master);
if (node_record_result != 1)
{
log_error(_("unable to retrieve node record from master"));
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_REGISTRATION_SYNC);
}
for (;;)
{
bool records_match = true;
if (runtime_options.wait_register_sync_seconds && runtime_options.wait_register_sync_seconds == timer)
break;
node_record_result = get_node_record(conn,
config_file_options.node_id,
&node_record_on_standby);
if (node_record_result == 0)
{
/* no record available yet on standby*/
records_match = false;
}
else if (node_record_result == 1)
{
/* compare relevant fields */
if (node_record_on_standby.upstream_node_id != node_record_on_master.upstream_node_id)
records_match = false;
if (node_record_on_standby.type != node_record_on_master.type)
records_match = false;
if (node_record_on_standby.priority != node_record_on_master.priority)
records_match = false;
if (node_record_on_standby.active != node_record_on_master.active)
records_match = false;
if (strcmp(node_record_on_standby.node_name, node_record_on_master.node_name) != 0)
records_match = false;
if (strcmp(node_record_on_standby.conninfo, node_record_on_master.conninfo) != 0)
records_match = false;
if (strcmp(node_record_on_standby.slot_name, node_record_on_master.slot_name) != 0)
records_match = false;
if (records_match == true)
{
sync_ok = true;
break;
}
}
sleep(1);
timer ++;
}
if (sync_ok == false)
{
log_error(_("node record was not synchronised after %i seconds"),
runtime_options.wait_register_sync_seconds);
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_REGISTRATION_SYNC);
}
log_info(_("node record on standby synchronised from master"));
}
PQfinish(master_conn);
if (PQstatus(conn) == CONNECTION_OK)
PQfinish(conn);
log_info(_("standby registration complete"));
log_notice(_("standby node \"%s\" (id: %i) successfully registered"),
config_file_options.node_name, config_file_options.node_id);
return;
}
void
do_standby_unregister(void)
{
PGconn *conn;
PGconn *master_conn;
int target_node_id;
t_node_info node_info = T_NODE_INFO_INITIALIZER;
bool node_record_deleted;
log_info(_("connecting to local standby"));
conn = establish_db_connection(config_file_options.conninfo, true);
/* check if there is a master in this cluster */
log_info(_("connecting to master database"));
master_conn = get_master_connection(conn, NULL, NULL);
if (PQstatus(master_conn) != CONNECTION_OK)
{
log_error(_("unable to connect to master server"));
log_detail("%s", PQerrorMessage(conn));
exit(ERR_BAD_CONFIG);
}
/*
* if --node-id was specified, unregister that node rather than the
* current one - this enables inactive nodes to be unregistered.
*/
if (runtime_options.node_id != UNKNOWN_NODE_ID)
target_node_id = runtime_options.node_id;
else
target_node_id = config_file_options.node_id;
/* Check node exists and is really a standby */
if (!get_node_record(master_conn, target_node_id, &node_info))
{
log_error(_("no record found for node %i"), target_node_id);
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
if (node_info.type != STANDBY)
{
log_error(_("node %i is not a standby server"), target_node_id);
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Now unregister the standby */
log_notice(_("unregistering node %i"), target_node_id);
node_record_deleted = delete_node_record(master_conn,
target_node_id);
if (node_record_deleted == false)
{
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Log the event */
create_event_record(master_conn,
&config_file_options,
target_node_id,
"standby_unregister",
true,
NULL);
PQfinish(master_conn);
PQfinish(conn);
log_info(_("standby unregistration complete"));
return;
}
static void
check_source_server()
{
PGconn *superuser_conn = NULL;
PGconn *privileged_conn = NULL;
char cluster_size[MAXLEN];
t_node_info node_record = T_NODE_INFO_INITIALIZER;
int query_result;
t_extension_status extension_status;
/* Attempt to connect to the upstream server to verify its configuration */
log_info(_("connecting to upstream node"));
source_conn = establish_db_connection_by_params((const char**)source_conninfo.keywords,
(const char**)source_conninfo.values,
false);
/*
* Unless in barman mode, exit with an error;
* establish_db_connection_by_params() will have already logged an error message
*/
if (PQstatus(source_conn) != CONNECTION_OK)
{
PQfinish(source_conn);
if (mode == barman)
return;
else
exit(ERR_DB_CON);
}
/*
* If a connection was established, perform some sanity checks on the
* provided upstream connection
*/
/* Verify that upstream node is a supported server version */
log_verbose(LOG_INFO, _("connected to source node, checking its state"));
server_version_num = check_server_version(source_conn, "master", true, NULL);
check_upstream_config(source_conn, server_version_num, true);
if (get_cluster_size(source_conn, cluster_size) == false)
exit(ERR_DB_QUERY);
log_info(_("successfully connected to source node"));
log_detail(_("current installation size is %s"),
cluster_size);
/*
* If --recovery-min-apply-delay was passed, check that
* we're connected to PostgreSQL 9.4 or later
*/
// XXX should this be a config file parameter?
if (*runtime_options.recovery_min_apply_delay)
{
if (server_version_num < 90400)
{
log_error(_("PostgreSQL 9.4 or greater required for --recovery-min-apply-delay"));
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
}
/*
* If the upstream node is a standby, try to connect to the primary too so we
* can write an event record
*/
if (is_standby(source_conn))
{
primary_conn = get_master_connection(source_conn, NULL, NULL);
// XXX check this worked?
}
else
{
primary_conn = source_conn;
}
/*
* Sanity-check that the master node has a repmgr schema - if not
* present, fail with an error unless -F/--force is used (to enable
* repmgr to be used as a standalone clone tool)
*/
extension_status = get_repmgr_extension_status(primary_conn);
if (extension_status != REPMGR_INSTALLED)
{
if (!runtime_options.force)
{
if (extension_status == REPMGR_UNKNOWN)
{
PQfinish(source_conn);
exit(ERR_DB_QUERY);
}
/* schema doesn't exist */
log_error(_("repmgr extension not found on source node"));
if (extension_status == REPMGR_AVAILABLE)
{
log_detail(_("repmgr extension is available but not installed in database \"%s\""),
param_get(&source_conninfo, "dbname"));
}
else if (extension_status == REPMGR_UNAVAILABLE)
{
log_detail(_("repmgr extension is not available on the upstream server"));
}
log_hint(_("check that the upstream server is part of a repmgr cluster"));
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
log_warning(_("repmgr extension not found on source node"));
}
/* Fetch the source's data directory */
get_superuser_connection(&source_conn, &superuser_conn, &privileged_conn);
if (get_pg_setting(privileged_conn, "data_directory", upstream_data_directory) == false)
{
log_error(_("unable to retrieve source node's data directory"));
log_hint(_("STANDBY CLONE must be run as a database superuser"));
PQfinish(source_conn);
if(superuser_conn != NULL)
PQfinish(superuser_conn);
exit(ERR_BAD_CONFIG);
}
if(superuser_conn != NULL)
PQfinish(superuser_conn);
/*
* If no target data directory was explicitly provided, we'll default to
* the source host's data directory.
*/
if (local_data_directory_provided == false)
{
strncpy(local_data_directory, upstream_data_directory, MAXPGPATH);
log_notice(_("setting data directory to: \"%s\""), local_data_directory);
log_hint(_("use -D/--pgdata to explicitly specify a data directory"));
}
/*
* In the default pg_basebackup mode, we'll cowardly refuse to overwrite
* an existing data directory
*/
if (mode == pg_basebackup)
{
if (is_pg_dir(local_data_directory))
{
log_error(_("target data directory appears to be a PostgreSQL data directory"));
log_detail(_("target data directory is \"%s\""), local_data_directory);
log_hint(_("ensure the target data directory is empty before running \"STANDBY CLONE\" in pg_basebackup mode"));
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
}
/*
* Copy the source connection so that we have some default values,
* particularly stuff like passwords extracted from PGPASSFILE;
* these will be overridden from the upstream conninfo, if provided.
*/
conn_to_param_list(source_conn, &recovery_conninfo);
/*
* Attempt to find the upstream node record
*/
if (config_file_options.upstream_node_id == NO_UPSTREAM_NODE)
upstream_node_id = get_master_node_id(source_conn);
else
upstream_node_id = config_file_options.upstream_node_id;
query_result = get_node_record(source_conn, upstream_node_id, &node_record);
if (query_result)
{
upstream_record_found = true;
strncpy(recovery_conninfo_str, node_record.conninfo, MAXLEN);
}
/*
* check that there's no existing node record with the same name but
* different ID
*/
query_result = get_node_record_by_name(source_conn, config_file_options.node_name, &node_record);
if (query_result)
{
log_error(_("another node (node_id: %i) already exists with node_name \"%s\""),
node_record.node_id,
config_file_options.node_name);
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
}
static void
check_source_server_via_barman()
{
char buf[MAXLEN];
char barman_conninfo_str[MAXLEN];
t_conninfo_param_list barman_conninfo;
char *errmsg = NULL;
bool parse_success,
command_success;
char where_condition[MAXLEN];
PQExpBufferData command_output;
PQExpBufferData repmgr_conninfo_buf;
int c;
get_barman_property(barman_conninfo_str, "conninfo", local_repmgr_tmp_directory);
initialize_conninfo_params(&barman_conninfo, false);
/* parse_conninfo_string() here will remove the upstream's `application_name`, if set */
parse_success = parse_conninfo_string(barman_conninfo_str, &barman_conninfo, errmsg, true);
if (parse_success == false)
{
log_error(_("Unable to parse barman conninfo string \"%s\":\n%s"),
barman_conninfo_str, errmsg);
exit(ERR_BARMAN);
}
/* Overwrite database name in the parsed parameter list */
param_set(&barman_conninfo, "dbname", runtime_options.dbname);
/* Rebuild the Barman conninfo string */
initPQExpBuffer(&repmgr_conninfo_buf);
for (c = 0; c < barman_conninfo.size && barman_conninfo.keywords[c] != NULL; c++)
{
if (repmgr_conninfo_buf.len != 0)
appendPQExpBufferChar(&repmgr_conninfo_buf, ' ');
appendPQExpBuffer(&repmgr_conninfo_buf, "%s=",
barman_conninfo.keywords[c]);
appendConnStrVal(&repmgr_conninfo_buf,
barman_conninfo.values[c]);
}
log_verbose(LOG_DEBUG,
"repmgr database conninfo string on barman server: %s",
repmgr_conninfo_buf.data);
// XXX check this works in all cases
maxlen_snprintf(where_condition, "node_id=%i", upstream_node_id);
initPQExpBuffer(&command_output);
maxlen_snprintf(buf,
"ssh %s \"psql -Aqt \\\"%s\\\" -c \\\""
" SELECT conninfo"
" FROM repmgr.nodes"
" WHERE %s"
" AND active IS TRUE"
"\\\"\"",
config_file_options.barman_host,
repmgr_conninfo_buf.data,
where_condition);
termPQExpBuffer(&repmgr_conninfo_buf);
command_success = local_command(buf, &command_output);
if (command_success == false)
{
log_error(_("unable to execute database query via Barman server"));
exit(ERR_BARMAN);
}
maxlen_snprintf(recovery_conninfo_str, "%s", command_output.data);
string_remove_trailing_newlines(recovery_conninfo_str);
upstream_record_found = true;
log_verbose(LOG_DEBUG,
"upstream node conninfo string extracted via barman server: %s",
recovery_conninfo_str);
termPQExpBuffer(&command_output);
}
/*
* In pg_basebackup/rsync modes, configure the target data directory
* if necessary, and fetch information about tablespaces and configuration
* files.
*/
static void
initialise_direct_clone(void)
{
PGconn *superuser_conn = NULL;
PGconn *privileged_conn = NULL;
PGresult *res;
PQExpBufferData query;
int i;
/*
* Check the destination data directory can be used
* (in Barman mode, this directory will already have been created)
*/
if (!create_pg_dir(local_data_directory, runtime_options.force))
{
log_error(_("unable to use directory \"%s\""),
local_data_directory);
log_hint(_("use -F/--force to force this directory to be overwritten"));
exit(ERR_BAD_CONFIG);
}
/*
* Check that tablespaces named in any `tablespace_mapping` configuration
* file parameters exist.
*
* pg_basebackup doesn't verify mappings, so any errors will not be caught.
* We'll do that here as a value-added service.
*
* -T/--tablespace-mapping is not available as a pg_basebackup option for
* PostgreSQL 9.3 - we can only handle that with rsync, so if `--rsync-only`
* not set, fail with an error
*/
if (config_file_options.tablespace_mapping.head != NULL)
{
TablespaceListCell *cell;
if (server_version_num < 90400 && !runtime_options.rsync_only)
{
log_error(_("in PostgreSQL 9.3, tablespace mapping can only be used in conjunction with --rsync-only"));
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
for (cell = config_file_options.tablespace_mapping.head; cell; cell = cell->next)
{
initPQExpBuffer(&query);
// XXX escape value
appendPQExpBuffer(&query,
"SELECT spcname "
" FROM pg_catalog.pg_tablespace "
" WHERE pg_catalog.pg_tablespace_location(oid) = '%s'",
cell->old_dir);
res = PQexec(source_conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to execute tablespace query:\n %s"),
PQerrorMessage(source_conn));
PQclear(res);
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
/* TODO: collate errors and output at end of loop */
if (PQntuples(res) == 0)
{
log_error(_("no tablespace matching path '%s' found"),
cell->old_dir);
PQclear(res);
PQfinish(source_conn);
exit(ERR_BAD_CONFIG);
}
}
}
/*
* Obtain configuration file locations
*
* We'll check to see whether the configuration files are in the data
* directory - if not we'll have to copy them via SSH, if copying
* requested.
*
* This will require superuser permissions, so we'll attempt to connect
* as -S/--superuser (if provided), otherwise check the current connection
* user has superuser rights.
*
* XXX: if configuration files are symlinks to targets outside the data
* directory, they won't be copied by pg_basebackup, but we can't tell
* this from the below query; we'll probably need to add a check for their
* presence and if missing force copy by SSH
*/
get_superuser_connection(&source_conn, &superuser_conn, &privileged_conn);
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
" WITH dd AS ( "
" SELECT setting AS data_directory"
" FROM pg_catalog.pg_settings "
" WHERE name = 'data_directory' "
" ) "
" SELECT DISTINCT(sourcefile), "
" pg_catalog.regexp_replace(sourcefile, '^.*\\/', '') AS filename, "
" sourcefile ~ ('^' || dd.data_directory) AS in_data_dir "
" FROM dd, pg_catalog.pg_settings ps "
" WHERE sourcefile IS NOT NULL "
" ORDER BY 1 ");
log_debug("standby clone: %s", query.data);
res = PQexec(privileged_conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to retrieve configuration file locations:\n %s"),
PQerrorMessage(privileged_conn));
PQclear(res);
PQfinish(source_conn);
if (superuser_conn != NULL)
PQfinish(superuser_conn);
exit(ERR_BAD_CONFIG);
}
/*
* allocate memory for config file array - number of rows returned from
* above query + 2 for pg_hba.conf, pg_ident.conf
*/
config_file_list_init(&config_files, PQntuples(res) + 2);
for (i = 0; i < PQntuples(res); i++)
{
config_file_list_add(&config_files,
PQgetvalue(res, i, 0),
PQgetvalue(res, i, 1),
strcmp(PQgetvalue(res, i, 2), "t") == 1 ? true : false);
}
PQclear(res);
/* Fetch locations of pg_hba.conf and pg_ident.conf */
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
" WITH dd AS ( "
" SELECT setting AS data_directory"
" FROM pg_catalog.pg_settings "
" WHERE name = 'data_directory' "
" ) "
" SELECT ps.setting, "
" regexp_replace(setting, '^.*\\/', '') AS filename, "
" ps.setting ~ ('^' || dd.data_directory) AS in_data_dir "
" FROM dd, pg_catalog.pg_settings ps "
" WHERE ps.name IN ('hba_file', 'ident_file') "
" ORDER BY 1 ");
log_debug("standby clone: %s", query.data);
res = PQexec(privileged_conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to retrieve configuration file locations:\n %s"),
PQerrorMessage(privileged_conn));
PQclear(res);
PQfinish(source_conn);
if (superuser_conn != NULL)
PQfinish(superuser_conn);
exit(ERR_BAD_CONFIG);
}
for (i = 0; i < PQntuples(res); i++)
{
config_file_list_add(&config_files,
PQgetvalue(res, i, 0),
PQgetvalue(res, i, 1),
strcmp(PQgetvalue(res, i, 2), "t") == 1 ? true : false);
}
PQclear(res);
/*
* If replication slots requested, create appropriate slot on
* the primary; this must be done before pg_start_backup() is
* issued, either by us or by pg_basebackup.
*
* Replication slots are not supported (and not very useful
* anyway) in Barman mode.
*/
if (config_file_options.use_replication_slots)
{
PQExpBufferData event_details;
initPQExpBuffer(&event_details);
if (create_replication_slot(privileged_conn, repmgr_slot_name, server_version_num, &event_details) == false)
{
log_error("%s", event_details.data);
create_event_record(primary_conn,
&config_file_options,
config_file_options.node_id,
"standby_clone",
false,
event_details.data);
PQfinish(source_conn);
if (superuser_conn != NULL)
PQfinish(superuser_conn);
exit(ERR_DB_QUERY);
}
termPQExpBuffer(&event_details);
log_notice(_("replication slot \"%s\" created on upstream node (node_id: %i)"),
repmgr_slot_name,
upstream_node_id);
}
if (superuser_conn != NULL)
PQfinish(superuser_conn);
return;
}
static int
run_basebackup(void)
{
char script[MAXLEN];
int r = 0;
PQExpBufferData params;
TablespaceListCell *cell;
t_basebackup_options backup_options = T_BASEBACKUP_OPTIONS_INITIALIZER;
/*
* Parse the pg_basebackup_options provided in repmgr.conf - we'll want
* to check later whether certain options were set by the user
*/
parse_pg_basebackup_options(config_file_options.pg_basebackup_options,
&backup_options,
server_version_num,
NULL);
/* Create pg_basebackup command line options */
initPQExpBuffer(&params);
appendPQExpBuffer(&params, " -D %s", local_data_directory);
/*
* conninfo string provided - pass it to pg_basebackup as the -d option
* (pg_basebackup doesn't require or want a database name, but for
* consistency with other applications accepts a conninfo string
* under -d/--dbname)
*/
if (runtime_options.conninfo_provided == true)
{
t_conninfo_param_list conninfo;
char *conninfo_str;
initialize_conninfo_params(&conninfo, false);
/* string will already have been parsed */
(void) parse_conninfo_string(runtime_options.dbname, &conninfo, NULL, false);
if (*runtime_options.replication_user)
param_set(&conninfo, "user", runtime_options.replication_user);
conninfo_str = param_list_to_string(&conninfo);
appendPQExpBuffer(&params, " -d '%s'", conninfo_str);
pfree(conninfo_str);
}
/*
* Connection parameters not passed to repmgr as conninfo string - provide
* them individually to pg_basebackup (-d/--dbname not required)
*/
else
{
if (strlen(runtime_options.host))
{
appendPQExpBuffer(&params, " -h %s", runtime_options.host);
}
if (strlen(runtime_options.port))
{
appendPQExpBuffer(&params, " -p %s", runtime_options.port);
}
if (strlen(runtime_options.replication_user))
{
appendPQExpBuffer(&params, " -U %s", runtime_options.replication_user);
}
else if (strlen(runtime_options.username))
{
appendPQExpBuffer(&params, " -U %s", runtime_options.username);
}
}
if (runtime_options.fast_checkpoint) {
appendPQExpBuffer(&params, " -c fast");
}
if (config_file_options.tablespace_mapping.head != NULL)
{
for (cell = config_file_options.tablespace_mapping.head; cell; cell = cell->next)
{
appendPQExpBuffer(&params, " -T %s=%s", cell->old_dir, cell->new_dir);
}
}
/*
* To ensure we have all the WALs needed during basebackup execution we stream
* them as the backup is taking place.
*
* From 9.6, if replication slots are in use, we'll have previously
* created a slot with reserved LSN, and will stream from that slot to avoid
* WAL buildup on the master using the -S/--slot, which requires -X/--xlog-method=stream
* (from 10, -X/--wal-method=stream)
*/
if (!strlen(backup_options.xlog_method))
{
appendPQExpBuffer(&params, " -X stream");
}
/*
* From 9.6, pg_basebackup accepts -S/--slot, which forces WAL streaming to use
* the specified replication slot. If replication slot usage is specified, the
* slot will already have been created.
*
* NOTE: currently there's no way of disabling the --slot option while using
* --xlog-method=stream - it's hard to imagine a use case for this, so no
* provision has been made for doing it.
*
* NOTE:
* It's possible to set 'pg_basebackup_options' with an invalid combination
* of values for --wal-method (--xlog-method) and --slot - we're not checking that, just that
* we're not overriding any user-supplied values
*/
if (server_version_num >= 90600 && config_file_options.use_replication_slots)
{
bool slot_add = true;
/*
* Check whether 'pg_basebackup_options' in repmgr.conf has the --slot option set,
* or if --wal-method (--xlog-method) is set to a value other than "stream"
* (in which case we can't use --slot).
*/
if (strlen(backup_options.slot) || (strlen(backup_options.xlog_method) && strcmp(backup_options.xlog_method, "stream") != 0)) {
slot_add = false;
}
if (slot_add == true)
{
appendPQExpBuffer(&params, " -S %s", repmgr_slot_name_ptr);
}
}
maxlen_snprintf(script,
"%s -l \"repmgr base backup\" %s %s",
make_pg_path("pg_basebackup"),
params.data,
config_file_options.pg_basebackup_options);
termPQExpBuffer(&params);
log_info(_("executing: '%s'"), script);
/*
* As of 9.4, pg_basebackup only ever returns 0 or 1
* XXX check for 10
*/
r = system(script);
if (r !=0)
return r;
return r;
}
static int
run_file_backup(void)
{
int r = 0, i;
char command[MAXLEN];
char filename[MAXLEN];
char buf[MAXLEN];
char backup_directory[MAXLEN];
char backup_id[MAXLEN] = "";
char *p, *q;
PQExpBufferData command_output;
TablespaceDataList tablespace_list = { NULL, NULL };
TablespaceDataListCell *cell_t;
PQExpBufferData tablespace_map;
bool tablespace_map_rewrite = false;
if (mode == barman)
{
/*
* Locate Barman's backup directory
*/
get_barman_property(backup_directory, "backup_directory", local_repmgr_tmp_directory);
/*
* Read the list of backup files into a local file. In the
* process:
*
* - determine the backup ID;
* - check, and remove, the prefix;
* - detect tablespaces;
* - filter files in one list per tablespace;
*/
{
FILE *fi; /* input stream */
FILE *fd; /* output for data.txt */
char prefix[MAXLEN];
char output[MAXLEN];
int n;
maxlen_snprintf(command, "%s list-files --target=data %s latest",
make_barman_ssh_command(barman_command_buf),
config_file_options.barman_server);
fi = popen(command, "r");
if (fi == NULL)
{
log_error("cannot launch command: %s", command);
exit(ERR_BARMAN);
}
fd = fopen(datadir_list_filename, "w");
if (fd == NULL)
{
log_error("cannot open file: %s", datadir_list_filename);
exit(ERR_INTERNAL);
}
maxlen_snprintf(prefix, "%s/base/", backup_directory);
while (fgets(output, MAXLEN, fi) != NULL)
{
/*
* Remove prefix
*/
p = string_skip_prefix(prefix, output);
if (p == NULL)
{
log_error("unexpected output from \"barman list-files\": %s",
output);
exit(ERR_BARMAN);
}
/*
* Remove and note backup ID; copy backup.info
*/
if (! strcmp(backup_id, ""))
{
FILE *fi2;
n = strcspn(p, "/");
strncpy(backup_id, p, n);
strncat(prefix,backup_id,MAXLEN-1);
strncat(prefix,"/",MAXLEN-1);
p = string_skip_prefix(backup_id, p);
p = string_skip_prefix("/", p);
/*
* Copy backup.info
*/
maxlen_snprintf(command,
"rsync -a %s:%s/base/%s/backup.info %s",
config_file_options.barman_host,
backup_directory,
backup_id,
local_repmgr_tmp_directory);
(void)local_command(
command,
&command_output);
/*
* Get tablespace data
*/
maxlen_snprintf(filename, "%s/backup.info",
local_repmgr_tmp_directory);
fi2 = fopen(filename, "r");
if (fi2 == NULL)
{
log_error("cannot open file: %s", filename);
exit(ERR_INTERNAL);
}
while (fgets(buf, MAXLEN, fi2) != NULL)
{
q = string_skip_prefix("tablespaces=", buf);
if (q != NULL && strncmp(q, "None\n", 5))
{
get_tablespace_data_barman(q, &tablespace_list);
}
q = string_skip_prefix("version=", buf);
if (q != NULL)
{
server_version_num = strtol(q, NULL, 10);
}
}
fclose(fi2);
unlink(filename);
continue;
}
/*
* Skip backup.info
*/
if (string_skip_prefix("backup.info", p))
continue;
/*
* Filter data directory files
*/
if ((q = string_skip_prefix("data/", p)) != NULL)
{
fputs(q, fd);
continue;
}
/*
* Filter other files (i.e. tablespaces)
*/
for (cell_t = tablespace_list.head; cell_t; cell_t = cell_t->next)
{
if ((q = string_skip_prefix(cell_t->oid, p)) != NULL && *q == '/')
{
if (cell_t->f == NULL)
{
maxlen_snprintf(filename, "%s/%s.txt", local_repmgr_tmp_directory, cell_t->oid);
cell_t->f = fopen(filename, "w");
if (cell_t->f == NULL)
{
log_error("cannot open file: %s", filename);
exit(ERR_INTERNAL);
}
}
fputs(q + 1, cell_t->f);
break;
}
}
}
fclose(fd);
pclose(fi);
}
/* For 9.5 and greater, create our own tablespace_map file */
if (server_version_num >= 90500)
{
initPQExpBuffer(&tablespace_map);
}
/*
* As of Barman version 1.6.1, the file structure of a backup
* is as follows:
*
* base/ - base backup
* wals/ - WAL files associated to the backup
*
* base/<ID> - backup files
*
* here ID has the standard timestamp form yyyymmddThhmmss
*
* base/<ID>/backup.info - backup metadata, in text format
* base/<ID>/data - data directory
* base/<ID>/<OID> - tablespace with the given oid
*/
/*
* Copy all backup files from the Barman server
*/
maxlen_snprintf(command,
"rsync --progress -a --files-from=%s %s:%s/base/%s/data %s",
datadir_list_filename,
config_file_options.barman_host,
backup_directory,
backup_id,
local_data_directory);
(void)local_command(
command,
&command_output);
unlink(datadir_list_filename);
/*
* We must create some PGDATA subdirectories because they are
* not included in the Barman backup.
*
* See class RsyncBackupExecutor in the Barman source (barman/backup_executor.py)
* for a definitive list of excluded directories.
*/
{
const char* const dirs[] = {
/* Only from 10 */
"pg_wal",
/* Only from 9.5 */
"pg_commit_ts",
/* Only from 9.4 */
"pg_dynshmem", "pg_logical", "pg_logical/snapshots", "pg_logical/mappings", "pg_replslot",
/* Already in 9.3 */
"pg_notify", "pg_serial", "pg_snapshots", "pg_stat", "pg_stat_tmp", "pg_tblspc",
"pg_twophase", "pg_xlog", 0
};
const int vers[] = {
100000,
90500,
90400, 90400, 90400, 90400, 90400,
0, 0, 0, 0, 0, 0,
0, -100000, 0
};
for (i = 0; dirs[i]; i++)
{
/* directory exists in newer versions than this server - skip */
if (vers[i] > 0 && server_version_num < vers[i])
continue;
/* directory existed in earlier versions than this server but has been removed/renamed - skip */
if (vers[i] < 0 && server_version_num >= abs(vers[i]))
continue;
maxlen_snprintf(filename, "%s/%s", local_data_directory, dirs[i]);
if (mkdir(filename, S_IRWXU) != 0 && errno != EEXIST)
{
log_error(_("unable to create the %s directory"), dirs[i]);
exit(ERR_INTERNAL);
}
}
}
}
else if (mode == rsync)
{
/* For 9.5 and greater, create our own tablespace_map file */
if (server_version_num >= 90500)
{
initPQExpBuffer(&tablespace_map);
}
if (start_backup(source_conn, first_wal_segment, runtime_options.fast_checkpoint, server_version_num) == false)
{
r = ERR_BAD_BASEBACKUP;
goto stop_backup;
}
/*
* Note that we've successfully executed pg_start_backup(),
* so we know whether or not to execute pg_stop_backup() after
* the 'stop_backup' label
*/
pg_start_backup_executed = true;
/*
* 1. copy data directory, omitting directories which should not be
* copied, or for which copying would serve no purpose.
*
* 2. copy pg_control file
*/
/* Copy the data directory */
log_info(_("standby clone: upstream data directory is '%s'"),
upstream_data_directory);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
upstream_data_directory, local_data_directory,
true, server_version_num);
/*
* Exit code 0 means no error, but we want to ignore exit code 24 as well
* as rsync returns that code on "Partial transfer due to vanished source files".
* It's quite common for this to happen on the data directory, particularly
* with long running rsync on a busy server.
*/
if (WIFEXITED(r) && WEXITSTATUS(r) && WEXITSTATUS(r) != 24)
{
log_error(_("standby clone: failed copying upstream data directory '%s'"),
upstream_data_directory);
r = ERR_BAD_RSYNC;
goto stop_backup;
}
/* Read backup label copied from primary */
if (read_backup_label(local_data_directory, &backup_label) == false)
{
r = ERR_BAD_BACKUP_LABEL;
goto stop_backup;
}
/* Copy tablespaces and, if required, remap to a new location */
r = get_tablespace_data(source_conn, &tablespace_list);
if (r != SUCCESS) goto stop_backup;
}
for (cell_t = tablespace_list.head; cell_t; cell_t = cell_t->next)
{
bool mapping_found = false;
TablespaceListCell *cell;
char *tblspc_dir_dest;
/* Check if tablespace path matches one of the provided tablespace mappings */
if (config_file_options.tablespace_mapping.head != NULL)
{
for (cell = config_file_options.tablespace_mapping.head; cell; cell = cell->next)
{
if (strcmp(cell_t->location, cell->old_dir) == 0)
{
mapping_found = true;
break;
}
}
}
if (mapping_found == true)
{
tblspc_dir_dest = cell->new_dir;
log_debug(_("mapping source tablespace '%s' (OID %s) to '%s'"),
cell_t->location, cell_t->oid, tblspc_dir_dest);
}
else
{
tblspc_dir_dest = cell_t->location;
}
/*
* Tablespace file copy
*/
if (mode == barman)
{
create_pg_dir(cell_t->location, false);
if (cell_t->f != NULL) /* cell_t->f == NULL iff the tablespace is empty */
{
maxlen_snprintf(command,
"rsync --progress -a --files-from=%s/%s.txt %s:%s/base/%s/%s %s",
local_repmgr_tmp_directory,
cell_t->oid,
config_file_options.barman_host,
backup_directory,
backup_id,
cell_t->oid,
tblspc_dir_dest);
(void)local_command(
command,
&command_output);
fclose(cell_t->f);
maxlen_snprintf(filename,
"%s/%s.txt",
local_repmgr_tmp_directory,
cell_t->oid);
unlink(filename);
}
}
else if (mode == rsync)
{
/* Copy tablespace directory */
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
cell_t->location, tblspc_dir_dest,
true, server_version_num);
/*
* Exit code 0 means no error, but we want to ignore exit code 24 as well
* as rsync returns that code on "Partial transfer due to vanished source files".
* It's quite common for this to happen on the data directory, particularly
* with long running rsync on a busy server.
*/
if (WIFEXITED(r) && WEXITSTATUS(r) && WEXITSTATUS(r) != 24)
{
log_error(_("standby clone: failed copying tablespace directory '%s'"),
cell_t->location);
r = ERR_BAD_RSYNC;
goto stop_backup;
}
}
/*
* If a valid mapping was provide for this tablespace, arrange for it to
* be remapped
* (if no tablespace mapping was provided, the link will be copied as-is
* by pg_basebackup or rsync and no action is required)
*/
if (mapping_found == true || mode == barman)
{
/* 9.5 and later - append to the tablespace_map file */
if (server_version_num >= 90500)
{
tablespace_map_rewrite = true;
appendPQExpBuffer(&tablespace_map,
"%s %s\n",
cell_t->oid,
tblspc_dir_dest);
}
/* Pre-9.5, we have to manipulate the symlinks in pg_tblspc/ ourselves */
else
{
PQExpBufferData tblspc_symlink;
initPQExpBuffer(&tblspc_symlink);
appendPQExpBuffer(&tblspc_symlink, "%s/pg_tblspc/%s",
local_data_directory,
cell_t->oid);
if (unlink(tblspc_symlink.data) < 0 && errno != ENOENT)
{
log_error(_("unable to remove tablespace symlink %s"), tblspc_symlink.data);
r = ERR_BAD_BASEBACKUP;
goto stop_backup;
}
if (symlink(tblspc_dir_dest, tblspc_symlink.data) < 0)
{
log_error(_("unable to create tablespace symlink from %s to %s"), tblspc_symlink.data, tblspc_dir_dest);
r = ERR_BAD_BASEBACKUP;
goto stop_backup;
}
}
}
}
/*
* For 9.5 and later, if tablespace remapping was requested, we'll need
* to rewrite the tablespace map file ourselves.
* The tablespace map file is read on startup and any links created by
* the backend; we could do this ourselves like for pre-9.5 servers, but
* it's better to rely on functionality the backend provides.
*/
if (server_version_num >= 90500 && tablespace_map_rewrite == true)
{
PQExpBufferData tablespace_map_filename;
FILE *tablespace_map_file;
initPQExpBuffer(&tablespace_map_filename);
appendPQExpBuffer(&tablespace_map_filename, "%s/%s",
local_data_directory,
TABLESPACE_MAP);
/* Unlink any existing file (it should be there, but we don't care if it isn't) */
if (unlink(tablespace_map_filename.data) < 0 && errno != ENOENT)
{
log_error(_("unable to remove tablespace_map file %s: %s"),
tablespace_map_filename.data,
strerror(errno));
r = ERR_BAD_BASEBACKUP;
goto stop_backup;
}
tablespace_map_file = fopen(tablespace_map_filename.data, "w");
if (tablespace_map_file == NULL)
{
log_error(_("unable to create tablespace_map file '%s'"), tablespace_map_filename.data);
r = ERR_BAD_BASEBACKUP;
goto stop_backup;
}
if (fputs(tablespace_map.data, tablespace_map_file) == EOF)
{
log_error(_("unable to write to tablespace_map file '%s'"), tablespace_map_filename.data);
r = ERR_BAD_BASEBACKUP;
goto stop_backup;
}
fclose(tablespace_map_file);
}
/*
* When using rsync, copy pg_control file last, emulating the base backup
* protocol.
*/
if (mode == rsync)
{
char upstream_control_file[MAXPGPATH] = "";
char local_control_file[MAXPGPATH] = "";
maxlen_snprintf(local_control_file, "%s/global", local_data_directory);
log_info(_("standby clone: local control file '%s'"),
local_control_file);
if (!create_dir(local_control_file))
{
log_error(_("couldn't create directory %s"),
local_control_file);
goto stop_backup;
}
maxlen_snprintf(upstream_control_file, "%s/global/pg_control",
upstream_data_directory);
log_debug("standby clone: upstream control file is \"%s\"",
upstream_control_file);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
upstream_control_file, local_control_file,
false, server_version_num);
if (WEXITSTATUS(r))
{
log_warning(_("standby clone: failed copying upstreamcontrol file \"%s\""),
upstream_control_file);
r = ERR_BAD_SSH;
goto stop_backup;
}
}
stop_backup:
if (mode == rsync && pg_start_backup_executed)
{
log_notice(_("notifying upstream about backup completion"));
if (stop_backup(source_conn, last_wal_segment, server_version_num) == false)
{
r = ERR_BAD_BASEBACKUP;
}
}
/* clean up copied data directory */
if (mode == rsync)
{
cleanup_data_directory();
}
else if (mode == barman)
{
/* In Barman mode, remove local_repmgr_directory */
rmtree(local_repmgr_tmp_directory, true);
}
return r;
}
static char *
make_barman_ssh_command(char *buf)
{
static char config_opt[MAXLEN] = "";
if (strlen(config_file_options.barman_config))
maxlen_snprintf(config_opt,
" --config=%s",
config_file_options.barman_config);
maxlen_snprintf(buf,
"ssh %s barman%s",
config_file_options.barman_host,
config_opt);
return buf;
}
static int
get_tablespace_data_barman
( char *tablespace_data_barman,
TablespaceDataList *tablespace_list)
{
/*
* Example:
* [('main', 24674, '/var/lib/postgresql/tablespaces/9.5/main'), ('alt', 24678, '/var/lib/postgresql/tablespaces/9.5/alt')]
*/
char name[MAXLEN];
char oid[MAXLEN];
char location[MAXPGPATH];
char *p = tablespace_data_barman;
int i;
tablespace_list->head = NULL;
tablespace_list->tail = NULL;
p = string_skip_prefix("[", p);
if (p == NULL) return -1;
while (*p == '(')
{
p = string_skip_prefix("('", p);
if (p == NULL) return -1;
i = strcspn(p, "'");
strncpy(name, p, i);
name[i] = 0;
p = string_skip_prefix("', ", p + i);
if (p == NULL) return -1;
i = strcspn(p, ",");
strncpy(oid, p, i);
oid[i] = 0;
p = string_skip_prefix(", '", p + i);
if (p == NULL) return -1;
i = strcspn(p, "'");
strncpy(location, p, i);
location[i] = 0;
p = string_skip_prefix("')", p + i);
if (p == NULL) return -1;
tablespace_data_append (tablespace_list, name, oid, location);
if (*p == ']')
break;
p = string_skip_prefix(", ", p);
if (p == NULL) return -1;
}
return SUCCESS;
}
void
get_barman_property(char *dst, char *name, char *local_repmgr_directory)
{
PQExpBufferData command_output;
char buf[MAXLEN];
char command[MAXLEN];
char *p;
initPQExpBuffer(&command_output);
maxlen_snprintf(command,
"grep \"^\t%s:\" %s/show-server.txt",
name, local_repmgr_tmp_directory);
(void)local_command(command, &command_output);
maxlen_snprintf(buf, "\t%s: ", name);
p = string_skip_prefix(buf, command_output.data);
if (p == NULL)
{
log_error("unexpected output from Barman: %s",
command_output.data);
exit(ERR_INTERNAL);
}
strncpy(dst, p, MAXLEN);
string_remove_trailing_newlines(dst);
termPQExpBuffer(&command_output);
}
static void
config_file_list_init(t_configfile_list *list, int max_size)
{
list->size = max_size;
list->entries = 0;
list->files = pg_malloc0(sizeof(t_configfile_info *) * max_size);
if (list->files == NULL)
{
log_error(_("unable to allocate memory; terminating"));
exit(ERR_OUT_OF_MEMORY);
}
}
static void
config_file_list_add(t_configfile_list *list, const char *file, const char *filename, bool in_data_dir)
{
/* Failsafe to prevent entries being added beyond the end */
if (list->entries == list->size)
return;
list->files[list->entries] = pg_malloc0(sizeof(t_configfile_info));
if (list->files[list->entries] == NULL)
{
log_error(_("unable to allocate memory; terminating"));
exit(ERR_OUT_OF_MEMORY);
}
strncpy(list->files[list->entries]->filepath, file, MAXPGPATH);
canonicalize_path(list->files[list->entries]->filepath);
strncpy(list->files[list->entries]->filename, filename, MAXPGPATH);
list->files[list->entries]->in_data_directory = in_data_dir;
list->entries ++;
}
static void
copy_configuration_files(void)
{
int i, r;
t_configfile_info *file;
char *host;
/* get host from upstream record */
host = param_get(&recovery_conninfo, "host");
if (host == NULL)
host = runtime_options.host;
log_verbose(LOG_DEBUG, "fetching configuration files from host \"%s\"", host);
log_notice(_("copying external configuration files from upstream node"));
r = test_ssh_connection(host, runtime_options.remote_user);
if (r != 0)
{
log_error(_("remote host %s is not reachable via SSH - unable to copy external configuration files"),
host);
return;
}
for (i = 0; i < config_files.entries; i++)
{
char dest_path[MAXPGPATH];
file = config_files.files[i];
/*
* Skip files in the data directory - these will be copied during
* the main backup
*/
if (file->in_data_directory == true)
continue;
if (runtime_options.copy_external_config_files_destination == CONFIG_FILE_SAMEPATH)
{
strncpy(dest_path, file->filepath, MAXPGPATH);
}
else
{
snprintf(dest_path, MAXPGPATH,
"%s/%s",
local_data_directory,
file->filename);
}
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
file->filepath, dest_path, false, server_version_num);
if (WEXITSTATUS(r))
{
log_error(_("standby clone: unable to copy config file \"%s\""),
file->filename);
}
}
return;
}
static int
get_tablespace_data(PGconn *upstream_conn, TablespaceDataList *list)
{
PQExpBufferData query;
PGresult *res;
int i;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
" SELECT spcname, oid, pg_catalog.pg_tablespace_location(oid) AS spclocation "
" FROM pg_catalog.pg_tablespace "
" WHERE spcname NOT IN ('pg_default', 'pg_global')");
res = PQexec(upstream_conn, query.data);
termPQExpBuffer(&query);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_error(_("unable to execute tablespace query:\n %s"),
PQerrorMessage(upstream_conn));
PQclear(res);
return ERR_DB_QUERY;
}
for (i = 0; i < PQntuples(res); i++)
tablespace_data_append(list,
PQgetvalue(res, i, 0),
PQgetvalue(res, i, 1),
PQgetvalue(res, i, 2));
PQclear(res);
return SUCCESS;
}
static void
tablespace_data_append(TablespaceDataList *list, const char *name, const char *oid, const char *location)
{
TablespaceDataListCell *cell;
cell = (TablespaceDataListCell *) pg_malloc0(sizeof(TablespaceDataListCell));
if (cell == NULL)
{
log_error(_("unable to allocate memory; terminating"));
exit(ERR_OUT_OF_MEMORY);
}
cell->oid = pg_malloc(1 + strlen(oid ));
cell->name = pg_malloc(1 + strlen(name ));
cell->location = pg_malloc(1 + strlen(location));
strncpy(cell->oid , oid , 1 + strlen(oid ));
strncpy(cell->name , name , 1 + strlen(name ));
strncpy(cell->location, location, 1 + strlen(location));
if (list->tail)
list->tail->next = cell;
else
list->head = cell;
list->tail = cell;
}
static void
parse_lsn(XLogRecPtr *ptr, const char *str)
{
uint32 high, low;
if (sscanf(str, "%x/%x", &high, &low) != 2)
return;
*ptr = (((XLogRecPtr)high) << 32) + (XLogRecPtr)low;
return;
}
static XLogRecPtr
parse_label_lsn(const char *label_key, const char *label_value)
{
XLogRecPtr ptr = InvalidXLogRecPtr;
parse_lsn(&ptr, label_value);
/* parse_lsn() will not modify ptr if it can't parse the label value */
if (ptr == InvalidXLogRecPtr)
{
log_error(_("couldn't parse backup label entry \"%s: %s\" as lsn"),
label_key, label_value);
}
return ptr;
}
/*======================================
* Read entries of interest from the backup label.
*
* Sample backup label (with failover slots):
*
* START WAL LOCATION: 0/6000028 (file 000000010000000000000006)
* CHECKPOINT LOCATION: 0/6000060
* BACKUP METHOD: streamed
* BACKUP FROM: master
* START TIME: 2016-03-30 12:18:12 AWST
* LABEL: pg_basebackup base backup
* MIN FAILOVER SLOT LSN: 0/5000000
*
*======================================
*/
static bool
read_backup_label(const char *local_data_directory, struct BackupLabel *out_backup_label)
{
char label_path[MAXPGPATH];
FILE *label_file;
int nmatches = 0;
char line[MAXLEN];
out_backup_label->start_wal_location = InvalidXLogRecPtr;
out_backup_label->start_wal_file[0] = '\0';
out_backup_label->checkpoint_location = InvalidXLogRecPtr;
out_backup_label->backup_from[0] = '\0';
out_backup_label->backup_method[0] = '\0';
out_backup_label->start_time[0] = '\0';
out_backup_label->label[0] = '\0';
out_backup_label->min_failover_slot_lsn = InvalidXLogRecPtr;
maxlen_snprintf(label_path, "%s/backup_label", local_data_directory);
label_file = fopen(label_path, "r");
if (label_file == NULL)
{
log_error(_("read_backup_label: could not open backup label file %s: %s"),
label_path, strerror(errno));
return false;
}
log_info(_("read_backup_label: parsing backup label file '%s'"),
label_path);
while(fgets(line, sizeof line, label_file) != NULL)
{
char label_key[MAXLEN];
char label_value[MAXLEN];
char newline;
nmatches = sscanf(line, "%" MAXLEN_STR "[^:]: %" MAXLEN_STR "[^\n]%c",
label_key, label_value, &newline);
if (nmatches != 3)
break;
if (newline != '\n')
{
log_error(_("read_backup_label: line too long in backup label file. Line begins \"%s: %s\""),
label_key, label_value);
return false;
}
log_verbose(LOG_DEBUG, "standby clone: got backup label entry \"%s: %s\"",
label_key, label_value);
if (strcmp(label_key, "START WAL LOCATION") == 0)
{
char start_wal_location[MAXLEN];
char wal_filename[MAXLEN];
nmatches = sscanf(label_value, "%" MAXLEN_STR "s (file %" MAXLEN_STR "[^)]", start_wal_location, wal_filename);
if (nmatches != 2)
{
log_error(_("read_backup_label: unable to parse \"START WAL LOCATION\" in backup label"));
return false;
}
out_backup_label->start_wal_location =
parse_label_lsn(&label_key[0], start_wal_location);
if (out_backup_label->start_wal_location == InvalidXLogRecPtr)
return false;
(void) strncpy(out_backup_label->start_wal_file, wal_filename, MAXLEN);
out_backup_label->start_wal_file[MAXLEN-1] = '\0';
}
else if (strcmp(label_key, "CHECKPOINT LOCATION") == 0)
{
out_backup_label->checkpoint_location =
parse_label_lsn(&label_key[0], &label_value[0]);
if (out_backup_label->checkpoint_location == InvalidXLogRecPtr)
return false;
}
else if (strcmp(label_key, "BACKUP METHOD") == 0)
{
(void) strncpy(out_backup_label->backup_method, label_value, MAXLEN);
out_backup_label->backup_method[MAXLEN-1] = '\0';
}
else if (strcmp(label_key, "BACKUP FROM") == 0)
{
(void) strncpy(out_backup_label->backup_from, label_value, MAXLEN);
out_backup_label->backup_from[MAXLEN-1] = '\0';
}
else if (strcmp(label_key, "START TIME") == 0)
{
(void) strncpy(out_backup_label->start_time, label_value, MAXLEN);
out_backup_label->start_time[MAXLEN-1] = '\0';
}
else if (strcmp(label_key, "LABEL") == 0)
{
(void) strncpy(out_backup_label->label, label_value, MAXLEN);
out_backup_label->label[MAXLEN-1] = '\0';
}
else if (strcmp(label_key, "MIN FAILOVER SLOT LSN") == 0)
{
out_backup_label->min_failover_slot_lsn =
parse_label_lsn(&label_key[0], &label_value[0]);
if (out_backup_label->min_failover_slot_lsn == InvalidXLogRecPtr)
return false;
}
else
{
log_info("read_backup_label: ignored unrecognised backup label entry \"%s: %s\"",
label_key, label_value);
}
}
(void) fclose(label_file);
log_debug("read_backup_label: label is %s; start wal file is %s",
out_backup_label->label, out_backup_label->start_wal_file);
return true;
}
static void
cleanup_data_directory(void)
{
char dirpath[MAXLEN] = "";
if (runtime_options.force)
{
/*
* Remove any WAL files in the target directory which might have
* been left over from previous use of this data directory;
* rsync's --exclude option won't do this.
*/
if (server_version_num >= 100000)
maxlen_snprintf(dirpath, "%s/pg_wal/", local_data_directory);
else
maxlen_snprintf(dirpath, "%s/pg_xlog/", local_data_directory);
if (!rmtree(dirpath, false))
{
log_error(_("unable to empty local WAL directory %s"),
dirpath);
exit(ERR_BAD_RSYNC);
}
}
/*
* Remove any existing replication slot directories from previous use
* of this data directory; this matches the behaviour of a fresh
* pg_basebackup, which would usually result in an empty pg_replslot
* directory.
*
* If the backup label contains a nonzero
* 'MIN FAILOVER SLOT LSN' entry we retain the slots and let
* the server clean them up instead, matching pg_basebackup's
* behaviour when failover slots are enabled.
*
* NOTE: watch out for any changes in the replication
* slot directory name (as of 9.4: "pg_replslot") and
* functionality of replication slots
*/
if (server_version_num >= 90400 &&
backup_label.min_failover_slot_lsn == InvalidXLogRecPtr)
{
maxlen_snprintf(dirpath, "%s/pg_replslot/",
local_data_directory);
log_debug("deleting pg_replslot directory contents");
if (!rmtree(dirpath, false))
{
log_error(_("unable to empty replication slot directory \"%s\""),
dirpath);
exit(ERR_BAD_RSYNC);
}
}
}
/*
* check_master_standby_version_match()
*
* Check server versions of supplied connections are compatible for
* replication purposes.
*
* Exits on error.
*/
static void
check_master_standby_version_match(PGconn *conn, PGconn *master_conn)
{
char standby_version[MAXVERSIONSTR];
int standby_version_num = 0;
char master_version[MAXVERSIONSTR];
int master_version_num = 0;
standby_version_num = check_server_version(conn, "standby", true, standby_version);
/* Verify that master is a supported server version */
master_version_num = check_server_version(conn, "master", false, master_version);
if (master_version_num < 0)
{
PQfinish(conn);
PQfinish(master_conn);
exit(ERR_BAD_CONFIG);
}
/* master and standby version should match */
if ((master_version_num / 100) != (standby_version_num / 100))
{
PQfinish(conn);
PQfinish(master_conn);
log_error(_("PostgreSQL versions on master (%s) and standby (%s) must match"),
master_version, standby_version);
exit(ERR_BAD_CONFIG);
}
}
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