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repmgr: add option -B/--remote-pg_bindir for standby switchover

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This enables the switchover operation to function if the remote server
(current primary) has a different binary directory to the current
server, and addresses the issue reported in GitHub #172.
This commit is contained in:
Ian Barwick
2016-06-30 12:51:54 +09:00
parent 097024a32f
commit c30447ac90
2 changed files with 54 additions and 15 deletions
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64
repmgr.c
View File

@@ -99,6 +99,7 @@ static bool check_upstream_config(PGconn *conn, int server_version_num, bool exi
static bool update_node_record_set_master(PGconn *conn, int this_node_id);
static char *make_pg_path(char *file);
static char *make_path(char *path, char *file);
static void do_master_register(void);
static void do_standby_register(void);
@@ -180,6 +181,7 @@ main(int argc, char **argv)
{"terse", required_argument, NULL, 't'},
{"mode", required_argument, NULL, 'm'},
{"remote-config-file", required_argument, NULL, 'C'},
{"remote-pg_bindir", required_argument, NULL, 'B'},
/* deprecated from 3.2; replaced with -P/--pwprompt */
{"initdb-no-pwprompt", no_argument, NULL, 1},
{"check-upstream-config", no_argument, NULL, 2},
@@ -382,10 +384,13 @@ main(int argc, char **argv)
termPQExpBuffer(&invalid_mode);
}
}
break;
break;
case 'C':
strncpy(runtime_options.remote_config_file, optarg, MAXLEN);
break;
case 'B':
strncpy(runtime_options.remote_pg_bindir, optarg, MAXLEN);
break;
case 1:
runtime_options.initdb_no_pwprompt = true;
break;
@@ -2734,7 +2739,7 @@ do_standby_follow(void)
*
* TODO:
* - make connection test timeouts/intervals configurable (see below)
* - add command line option --remote_pg_bindir or similar to
* - add command line option --remote-pg_bindir or similar to
* optionally handle cases where the remote pg_bindir is different
*/
@@ -2751,7 +2756,8 @@ do_standby_switchover(void)
char remote_host[MAXLEN];
char remote_data_directory[MAXLEN];
int remote_node_id;
char remote_node_replication_state[MAXLEN] = "";
char remote_node_replication_state[MAXLEN] = "";
char remote_pg_bindir[MAXLEN] = "";
char remote_archive_config_dir[MAXLEN];
char remote_pg_rewind[MAXLEN];
int i,
@@ -2766,6 +2772,20 @@ do_standby_switchover(void)
bool connection_success;
/*
* If --remote_pg_bindir supplied, use that to build the path on the
* remote host; if not default to whatever value is set in pg_bindir
*/
if (strlen(runtime_options.remote_pg_bindir))
{
strncpy(remote_pg_bindir, runtime_options.remote_pg_bindir, MAXLEN);
}
else
{
strncpy(remote_pg_bindir, pg_bindir, MAXLEN);
}
/*
* SANITY CHECKS
*
@@ -2895,7 +2915,7 @@ do_standby_switchover(void)
use_pg_rewind = true;
maxlen_snprintf(remote_pg_rewind,
"%s",
make_pg_path("pg_rewind"));
make_path(remote_pg_bindir, "pg_rewind"));
}
else
{
@@ -2916,7 +2936,7 @@ do_standby_switchover(void)
{
maxlen_snprintf(remote_pg_rewind,
"%s",
make_pg_path("pg_rewind"));
make_path(remote_pg_bindir, "pg_rewind"));
}
}
else
@@ -3112,7 +3132,7 @@ do_standby_switchover(void)
maxlen_snprintf(command,
"%s standby archive-config -f %s --config-archive-dir=%s",
make_pg_path("repmgr"),
make_path(remote_pg_bindir, "repmgr"),
runtime_options.remote_config_file,
remote_archive_config_dir);
@@ -3151,7 +3171,7 @@ do_standby_switchover(void)
maxlen_snprintf(command,
"%s -D %s -m %s -W stop >/dev/null 2>&1 && echo 1 || echo 0",
make_pg_path("pg_ctl"),
make_path(remote_pg_bindir, "pg_ctl"),
remote_data_directory,
runtime_options.pg_ctl_mode);
@@ -3247,7 +3267,7 @@ do_standby_switchover(void)
/* Restore any previously archived config files */
maxlen_snprintf(command,
"%s standby restore-config -D %s --config-archive-dir=%s",
make_pg_path("repmgr"),
make_path(remote_pg_bindir, "repmgr"),
remote_data_directory,
remote_archive_config_dir);
@@ -3305,7 +3325,7 @@ do_standby_switchover(void)
format_db_cli_params(options.conninfo, repmgr_db_cli_params);
maxlen_snprintf(command,
"%s -D %s -f %s %s --rsync-only --force --ignore-external-config-files standby clone",
make_pg_path("repmgr"),
make_path(remote_pg_bindir, "repmgr"),
remote_data_directory,
runtime_options.remote_config_file,
repmgr_db_cli_params
@@ -3331,7 +3351,7 @@ do_standby_switchover(void)
format_db_cli_params(options.conninfo, repmgr_db_cli_params);
maxlen_snprintf(command,
"%s -D %s -f %s %s standby follow",
make_pg_path("repmgr"),
make_path(remote_pg_bindir, "repmgr"),
remote_data_directory,
runtime_options.remote_config_file,
repmgr_db_cli_params
@@ -3355,13 +3375,15 @@ do_standby_switchover(void)
for(i = 0; i < options.reconnect_attempts; i++)
{
/* Check whether primary is available */
/* Check whether new standby available */
remote_conn = test_db_connection(remote_conninfo, false); /* don't fail on error */
if (PQstatus(remote_conn) == CONNECTION_OK)
{
log_debug("connected to new standby (old master)\n");
/* make sure it's actually a standby */
if (is_standby(remote_conn) == 0)
{
log_err(_("new standby (old master) is not a standby\n"));
@@ -4201,6 +4223,8 @@ do_help(void)
printf(_(" -m, --mode (standby switchover) shutdown mode (smart|fast|immediate)\n"));
printf(_(" -C, --remote-config-file (standby switchover) path to the configuration file on\n" \
" the current master\n"));
printf(_(" -B, --remote-pg_bindir (standby switchover) path to PostgreSQL binaries on\n" \
" the current master\n"));
printf(_(" --pg_rewind[=VALUE] (standby switchover) 9.3/9.4 only - use pg_rewind if available,\n" \
" optionally providing a path to the binary\n"));
printf(_(" -k, --keep-history=VALUE (cluster cleanup) retain indicated number of days of history (default: 0)\n"));
@@ -4743,6 +4767,14 @@ check_parameters_for_action(const int action)
}
}
if (action != STANDBY_SWITCHOVER)
{
if (strlen(runtime_options.remote_pg_bindir))
{
error_list_append(&cli_warnings, _("--remote-pg_bindir an only be used when executing STANDBY_SWITCHOVER"));
}
}
return;
}
@@ -5496,12 +5528,18 @@ do_check_upstream_config(void)
static char *
make_pg_path(char *file)
{
maxlen_snprintf(path_buf, "%s%s", pg_bindir, file);
return make_path(pg_bindir, file);
}
static char *
make_path(char *path, char *file)
{
maxlen_snprintf(path_buf, "%s%s", path, file);
return path_buf;
}
static void
exit_with_errors(void)
{

5
repmgr.h
View File

@@ -79,8 +79,9 @@ typedef struct
*/
char loglevel[MAXLEN];
/* parameter used by STANDBY SWITCHOVER */
/* parameters used by STANDBY SWITCHOVER */
char remote_config_file[MAXLEN];
char remote_pg_bindir[MAXLEN];
char pg_rewind[MAXPGPATH];
/* parameter used by STANDBY {ARCHIVE_CONFIG | RESTORE_CONFIG} */
char config_archive_dir[MAXLEN];
@@ -96,7 +97,7 @@ typedef struct
bool initdb_no_pwprompt;
} t_runtime_options;
#define T_RUNTIME_OPTIONS_INITIALIZER { "", "", "", "", "", "", "", DEFAULT_WAL_KEEP_SEGMENTS, false, false, false, false, false, false, false, false, false, false, "smart", "", "", "", "", "", 0, "", "", "", false }
#define T_RUNTIME_OPTIONS_INITIALIZER { "", "", "", "", "", "", "", DEFAULT_WAL_KEEP_SEGMENTS, false, false, false, false, false, false, false, false, false, false, "smart", "", "", "", "", "", "", 0, "", "", "", false }
struct BackupLabel
{