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repmgr.c
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/*
* repmgr.c - Command interpreter for the repmgr package
* Copyright (C) 2ndQuadrant, 2010-2016
*
* This module is a command-line utility to easily setup a cluster of
* hot standby servers for an HA environment
*
* Commands implemented are:
*
* [ MASTER | PRIMARY ] REGISTER
*
* STANDBY REGISTER
* STANDBY UNREGISTER
* STANDBY CLONE
* STANDBY FOLLOW
* STANDBY PROMOTE
* STANDBY SWITCHOVER
*
* WITNESS CREATE
*
* CLUSTER SHOW
* CLUSTER CLEANUP
*
* For internal use:
* STANDBY ARCHIVE-CONFIG
* STANDBY RESTORE-CONFIG
*
* 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 <sys/types.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include "storage/fd.h" /* for PG_TEMP_FILE_PREFIX */
#include "pqexpbuffer.h"
#include "log.h"
#include "config.h"
#include "check_dir.h"
#include "strutil.h"
#include "version.h"
#define RECOVERY_FILE "recovery.conf"
#ifndef TABLESPACE_MAP
#define TABLESPACE_MAP "tablespace_map"
#endif
#define WITNESS_DEFAULT_PORT "5499" /* If this value is ever changed, remember
* to update comments and documentation */
#define NO_ACTION 0 /* Dummy default action */
#define MASTER_REGISTER 1
#define STANDBY_REGISTER 2
#define STANDBY_UNREGISTER 3
#define STANDBY_CLONE 4
#define STANDBY_PROMOTE 5
#define STANDBY_FOLLOW 6
#define STANDBY_SWITCHOVER 7
#define STANDBY_ARCHIVE_CONFIG 8
#define STANDBY_RESTORE_CONFIG 9
#define WITNESS_CREATE 10
#define CLUSTER_SHOW 11
#define CLUSTER_CLEANUP 12
static bool create_recovery_file(const char *data_dir);
static int test_ssh_connection(char *host, char *remote_user);
static int copy_remote_files(char *host, char *remote_user, char *remote_path,
char *local_path, bool is_directory, int server_version_num);
static int run_basebackup(const char *data_dir);
static void check_parameters_for_action(const int action);
static bool create_schema(PGconn *conn);
static void write_primary_conninfo(char *line);
static bool write_recovery_file_line(FILE *recovery_file, char *recovery_file_path, char *line);
static void check_master_standby_version_match(PGconn *conn, PGconn *master_conn);
static int check_server_version(PGconn *conn, char *server_type, bool exit_on_error, char *server_version_string);
static bool check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error);
static bool update_node_record_set_master(PGconn *conn, int this_node_id);
static char *make_pg_path(char *file);
static void do_master_register(void);
static void do_standby_register(void);
static void do_standby_unregister(void);
static void do_standby_clone(void);
static void do_standby_promote(void);
static void do_standby_follow(void);
static void do_standby_switchover(void);
static void do_standby_archive_config(void);
static void do_standby_restore_config(void);
static void do_witness_create(void);
static void do_cluster_show(void);
static void do_cluster_cleanup(void);
static void do_check_upstream_config(void);
static void do_help(void);
static void exit_with_errors(void);
static void print_error_list(ErrorList *error_list, int log_level);
static bool remote_command(const char *host, const char *user, const char *command, PQExpBufferData *outputbuf);
static void format_db_cli_params(const char *conninfo, char *output);
static bool copy_file(const char *old_filename, const char *new_filename);
/* Global variables */
static const char *keywords[6];
static const char *values[6];
static bool config_file_required = true;
/* Initialization of runtime options */
t_runtime_options runtime_options = T_RUNTIME_OPTIONS_INITIALIZER;
t_configuration_options options = T_CONFIGURATION_OPTIONS_INITIALIZER;
bool wal_keep_segments_used = false;
bool connection_param_provided = false;
bool pg_rewind_supplied = false;
static char *server_mode = NULL;
static char *server_cmd = NULL;
static char pg_bindir[MAXLEN] = "";
static char repmgr_slot_name[MAXLEN] = "";
static char *repmgr_slot_name_ptr = NULL;
static char path_buf[MAXLEN] = "";
/* Collate command line errors and warnings here for friendlier reporting */
ErrorList cli_errors = { NULL, NULL };
ErrorList cli_warnings = { NULL, NULL };
int
main(int argc, char **argv)
{
static struct option long_options[] =
{
{"dbname", required_argument, NULL, 'd'},
{"host", required_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{"username", required_argument, NULL, 'U'},
{"superuser", required_argument, NULL, 'S'},
{"data-dir", required_argument, NULL, 'D'},
/* -l/--local-port is deprecated */
{"local-port", required_argument, NULL, 'l'},
{"config-file", required_argument, NULL, 'f'},
{"remote-user", required_argument, NULL, 'R'},
{"wal-keep-segments", required_argument, NULL, 'w'},
{"keep-history", required_argument, NULL, 'k'},
{"force", no_argument, NULL, 'F'},
{"wait", no_argument, NULL, 'W'},
{"verbose", no_argument, NULL, 'v'},
{"pg_bindir", required_argument, NULL, 'b'},
{"rsync-only", no_argument, NULL, 'r'},
{"fast-checkpoint", no_argument, NULL, 'c'},
{"log-level", required_argument, NULL, 'L'},
{"terse", required_argument, NULL, 't'},
{"mode", required_argument, NULL, 'm'},
{"remote-config-file", required_argument, NULL, 'C'},
{"initdb-no-pwprompt", no_argument, NULL, 1},
{"check-upstream-config", no_argument, NULL, 2},
{"recovery-min-apply-delay", required_argument, NULL, 3},
{"ignore-external-config-files", no_argument, NULL, 4},
{"config-archive-dir", required_argument, NULL, 5},
{"pg_rewind", optional_argument, NULL, 6},
{"help", no_argument, NULL, '?'},
{"version", no_argument, NULL, 'V'},
{NULL, 0, NULL, 0}
};
int optindex;
int c, targ;
int action = NO_ACTION;
bool check_upstream_config = false;
bool config_file_parsed = false;
char *ptr = NULL;
const char *env;
set_progname(argv[0]);
/* Initialise some defaults */
/* set default user */
env = getenv("PGUSER");
if (!env)
{
struct passwd *pw = NULL;
pw = getpwuid(geteuid());
if (pw)
{
env = pw->pw_name;
}
else
{
fprintf(stderr, "could not get current user name: %s\n", strerror(errno));
exit(ERR_BAD_CONFIG);
}
}
strncpy(runtime_options.username, env, MAXLEN);
/* set default database */
env = getenv("PGDATABASE");
if (!env)
{
env = runtime_options.username;
}
strncpy(runtime_options.dbname, env, MAXLEN);
/* set default port */
env = getenv("PGPORT");
if (!env)
{
env = DEF_PGPORT_STR;
}
strncpy(runtime_options.masterport, env, MAXLEN);
/* Prevent getopt_long() from printing an error message */
opterr = 0;
while ((c = getopt_long(argc, argv, "?Vd:h:p:U:S:D:l:f:R:w:k:FWIvb:rcL:tm:C:", long_options,
&optindex)) != -1)
{
/*
* NOTE: some integer parameters (e.g. -p/--port) are stored internally
* as strings. We use repmgr_atoi() to check these but discard the
* returned integer; repmgr_atoi() will append the error message to the
* provided list.
*/
switch (c)
{
case '?':
do_help();
exit(SUCCESS);
case 'V':
printf("%s %s (PostgreSQL %s)\n", progname(), REPMGR_VERSION, PG_VERSION);
exit(SUCCESS);
case 'd':
strncpy(runtime_options.dbname, optarg, MAXLEN);
connection_param_provided = true;
break;
case 'h':
strncpy(runtime_options.host, optarg, MAXLEN);
connection_param_provided = true;
break;
case 'p':
repmgr_atoi(optarg, "-p/--port", &cli_errors, false);
strncpy(runtime_options.masterport,
optarg,
MAXLEN);
connection_param_provided = true;
break;
case 'U':
strncpy(runtime_options.username, optarg, MAXLEN);
connection_param_provided = true;
break;
case 'S':
strncpy(runtime_options.superuser, optarg, MAXLEN);
break;
case 'D':
strncpy(runtime_options.dest_dir, optarg, MAXFILENAME);
break;
case 'l':
/* -l/--local-port is deprecated */
repmgr_atoi(optarg, "-l/--local-port", &cli_errors, false);
strncpy(runtime_options.localport,
optarg,
MAXLEN);
break;
case 'f':
strncpy(runtime_options.config_file, optarg, MAXLEN);
break;
case 'R':
strncpy(runtime_options.remote_user, optarg, MAXLEN);
break;
case 'w':
repmgr_atoi(optarg, "-w/--wal-keep-segments", &cli_errors, false);
strncpy(runtime_options.wal_keep_segments,
optarg,
MAXLEN);
wal_keep_segments_used = true;
break;
case 'k':
runtime_options.keep_history = repmgr_atoi(optarg, "-k/--keep-history", &cli_errors, false);
break;
case 'F':
runtime_options.force = true;
break;
case 'W':
runtime_options.wait_for_master = true;
break;
case 'I':
runtime_options.ignore_rsync_warn = true;
break;
case 'v':
runtime_options.verbose = true;
break;
case 'b':
strncpy(runtime_options.pg_bindir, optarg, MAXLEN);
break;
case 'r':
runtime_options.rsync_only = true;
break;
case 'c':
runtime_options.fast_checkpoint = true;
break;
case 'L':
{
int detected_log_level = detect_log_level(optarg);
if (detected_log_level != -1)
{
strncpy(runtime_options.loglevel, optarg, MAXLEN);
}
else
{
PQExpBufferData invalid_log_level;
initPQExpBuffer(&invalid_log_level);
appendPQExpBuffer(&invalid_log_level, _("Invalid log level \"%s\" provided"), optarg);
error_list_append(&cli_errors, invalid_log_level.data);
termPQExpBuffer(&invalid_log_level);
}
break;
}
case 't':
runtime_options.terse = true;
break;
case 'm':
{
if (strcmp(optarg, "smart") == 0 ||
strcmp(optarg, "fast") == 0 ||
strcmp(optarg, "immediate") == 0
)
{
strncpy(runtime_options.pg_ctl_mode, optarg, MAXLEN);
}
else
{
PQExpBufferData invalid_mode;
initPQExpBuffer(&invalid_mode);
appendPQExpBuffer(&invalid_mode, _("Invalid pg_ctl shutdown mode \"%s\" provided"), optarg);
error_list_append(&cli_errors, invalid_mode.data);
termPQExpBuffer(&invalid_mode);
}
}
break;
case 'C':
strncpy(runtime_options.remote_config_file, optarg, MAXLEN);
break;
case 1:
runtime_options.initdb_no_pwprompt = true;
break;
case 2:
check_upstream_config = true;
break;
case 3:
targ = strtol(optarg, &ptr, 10);
if (targ < 1)
{
error_list_append(&cli_errors, _("Invalid value provided for '-r/--recovery-min-apply-delay'"));
break;
}
if (ptr && *ptr)
{
if (strcmp(ptr, "ms") != 0 && strcmp(ptr, "s") != 0 &&
strcmp(ptr, "min") != 0 && strcmp(ptr, "h") != 0 &&
strcmp(ptr, "d") != 0)
{
error_list_append(&cli_errors, _("Value provided for '-r/--recovery-min-apply-delay' must be one of ms/s/min/h/d"));
break;
}
}
strncpy(runtime_options.recovery_min_apply_delay, optarg, MAXLEN);
break;
case 4:
runtime_options.ignore_external_config_files = true;
break;
case 5:
strncpy(runtime_options.config_archive_dir, optarg, MAXLEN);
break;
case 6:
if (optarg != NULL)
{
strncpy(runtime_options.pg_rewind, optarg, MAXFILENAME);
}
pg_rewind_supplied = true;
break;
default:
{
PQExpBufferData unknown_option;
initPQExpBuffer(&unknown_option);
appendPQExpBuffer(&unknown_option, _("Unknown option '%s'"), argv[optind - 1]);
error_list_append(&cli_errors, unknown_option.data);
}
}
}
/* Exit here already if errors in command line options found */
if (cli_errors.head != NULL)
{
exit_with_errors();
}
if (check_upstream_config == true)
{
do_check_upstream_config();
exit(SUCCESS);
}
/*
* Now we need to obtain the action, this comes in one of these forms:
* { MASTER | PRIMARY } REGISTER |
* STANDBY {REGISTER | UNREGISTER | CLONE [node] | PROMOTE | FOLLOW [node] | SWITCHOVER | REWIND} |
* WITNESS CREATE |
* CLUSTER {SHOW | CLEANUP}
*
* the node part is optional, if we receive it then we shouldn't have
* received a -h option
*/
if (optind < argc)
{
server_mode = argv[optind++];
if (strcasecmp(server_mode, "STANDBY") != 0 &&
strcasecmp(server_mode, "MASTER") != 0 &&
/* allow PRIMARY as synonym for MASTER */
strcasecmp(server_mode, "PRIMARY") != 0 &&
strcasecmp(server_mode, "WITNESS") != 0 &&
strcasecmp(server_mode, "CLUSTER") != 0)
{
PQExpBufferData unknown_mode;
initPQExpBuffer(&unknown_mode);
appendPQExpBuffer(&unknown_mode, _("Unknown server mode '%s'"), server_mode);
error_list_append(&cli_errors, unknown_mode.data);
}
}
if (optind < argc)
{
server_cmd = argv[optind++];
/* check posibilities for all server modes */
if (strcasecmp(server_mode, "MASTER") == 0 || strcasecmp(server_mode, "PRIMARY") == 0 )
{
if (strcasecmp(server_cmd, "REGISTER") == 0)
action = MASTER_REGISTER;
}
else if (strcasecmp(server_mode, "STANDBY") == 0)
{
if (strcasecmp(server_cmd, "REGISTER") == 0)
action = STANDBY_REGISTER;
if (strcasecmp(server_cmd, "UNREGISTER") == 0)
action = STANDBY_UNREGISTER;
else if (strcasecmp(server_cmd, "CLONE") == 0)
action = STANDBY_CLONE;
else if (strcasecmp(server_cmd, "PROMOTE") == 0)
action = STANDBY_PROMOTE;
else if (strcasecmp(server_cmd, "FOLLOW") == 0)
action = STANDBY_FOLLOW;
else if (strcasecmp(server_cmd, "SWITCHOVER") == 0)
action = STANDBY_SWITCHOVER;
else if (strcasecmp(server_cmd, "ARCHIVE-CONFIG") == 0)
action = STANDBY_ARCHIVE_CONFIG;
else if (strcasecmp(server_cmd, "RESTORE-CONFIG") == 0)
action = STANDBY_RESTORE_CONFIG;
}
else if (strcasecmp(server_mode, "CLUSTER") == 0)
{
if (strcasecmp(server_cmd, "SHOW") == 0)
action = CLUSTER_SHOW;
else if (strcasecmp(server_cmd, "CLEANUP") == 0)
action = CLUSTER_CLEANUP;
}
else if (strcasecmp(server_mode, "WITNESS") == 0)
{
if (strcasecmp(server_cmd, "CREATE") == 0)
action = WITNESS_CREATE;
}
}
if (action == NO_ACTION) {
if (server_cmd == NULL)
{
error_list_append(&cli_errors, "No server command provided");
}
else
{
PQExpBufferData unknown_action;
initPQExpBuffer(&unknown_action);
appendPQExpBuffer(&unknown_action, _("Unknown server command '%s'"), server_cmd);
error_list_append(&cli_errors, unknown_action.data);
}
}
/* For some actions we still can receive a last argument */
if (action == STANDBY_CLONE)
{
if (optind < argc)
{
if (runtime_options.host[0])
{
error_list_append(&cli_errors, _("Conflicting parameters: you can't use -h while providing a node separately."));
}
else
{
strncpy(runtime_options.host, argv[optind++], MAXLEN);
}
}
}
if (optind < argc)
{
PQExpBufferData too_many_args;
initPQExpBuffer(&too_many_args);
appendPQExpBuffer(&too_many_args, _("too many command-line arguments (first extra is \"%s\")"), argv[optind]);
error_list_append(&cli_errors, too_many_args.data);
}
check_parameters_for_action(action);
/*
* Sanity checks for command line parameters completed by now;
* any further errors will be runtime ones
*/
if (cli_errors.head != NULL)
{
exit_with_errors();
}
if (cli_warnings.head != NULL && runtime_options.terse == false)
{
print_error_list(&cli_warnings, LOG_WARNING);
}
/*
* The configuration file is not required for some actions (e.g. 'standby clone'),
* however if available we'll parse it anyway for options like 'log_level',
* 'use_replication_slots' etc.
*/
config_file_parsed = load_config(runtime_options.config_file,
runtime_options.verbose,
&options,
argv[0]);
/* Some configuration file items can be overriden by command line options */
/* Command-line parameter -L/--log-level overrides any setting in config file*/
if (*runtime_options.loglevel != '\0')
{
strncpy(options.loglevel, runtime_options.loglevel, MAXLEN);
}
/*
* Initialise pg_bindir - command line parameter will override
* any setting in the configuration file
*/
if (!strlen(runtime_options.pg_bindir))
{
strncpy(runtime_options.pg_bindir, options.pg_bindir, MAXLEN);
}
/* Add trailing slash */
if (strlen(runtime_options.pg_bindir))
{
int len = strlen(runtime_options.pg_bindir);
if (runtime_options.pg_bindir[len - 1] != '/')
{
maxlen_snprintf(pg_bindir, "%s/", runtime_options.pg_bindir);
}
else
{
strncpy(pg_bindir, runtime_options.pg_bindir, MAXLEN);
}
}
keywords[2] = "user";
values[2] = (runtime_options.username[0]) ? runtime_options.username : NULL;
keywords[3] = "dbname";
values[3] = runtime_options.dbname;
keywords[4] = "application_name";
values[4] = (char *) progname();
keywords[5] = NULL;
values[5] = NULL;
/*
* Initialize the logger. If verbose command line parameter was input,
* make sure that the log level is at least INFO. This is mainly useful
* for STANDBY CLONE. That doesn't require a configuration file where a
* logging level might be specified at, but it often requires detailed
* logging to troubleshoot problems.
*/
logger_init(&options, progname());
if (runtime_options.verbose)
logger_set_verbose();
if (runtime_options.terse)
logger_set_terse();
/*
* Node configuration information is not needed for all actions, with
* STANDBY CLONE being the main exception.
*/
if (config_file_required)
{
if (options.node == NODE_NOT_FOUND)
{
if (config_file_parsed == true)
{
log_err(_("No node information was found. "
"Check the configuration file.\n"));
}
else
{
log_err(_("No node information was found. "
"Please supply a configuration file.\n"));
}
exit(ERR_BAD_CONFIG);
}
}
/*
* If `use_replication_slots` set in the configuration file
* and command line parameter `--wal-keep-segments` was used,
* emit a warning as to the latter's redundancy. Note that
* the version check for 9.4 or later is done in check_upstream_config()
*/
if (options.use_replication_slots && wal_keep_segments_used)
{
log_warning(_("-w/--wal-keep-segments has no effect when replication slots in use\n"));
}
/* Initialise the repmgr schema name */
maxlen_snprintf(repmgr_schema, "%s%s", DEFAULT_REPMGR_SCHEMA_PREFIX,
options.cluster_name);
/*
* Initialise slot name, if required (9.4 and later)
*
* NOTE: the slot name will be defined for each record, including
* the master; the `slot_name` column in `repl_nodes` defines
* the name of the slot, but does not imply a slot has been created.
* The version check for 9.4 or later is done in check_upstream_config()
*/
if (options.use_replication_slots)
{
maxlen_snprintf(repmgr_slot_name, "repmgr_slot_%i", options.node);
repmgr_slot_name_ptr = repmgr_slot_name;
log_verbose(LOG_DEBUG, "slot name initialised as: %s\n", repmgr_slot_name);
}
switch (action)
{
case MASTER_REGISTER:
do_master_register();
break;
case STANDBY_REGISTER:
do_standby_register();
break;
case STANDBY_UNREGISTER:
do_standby_unregister();
break;
case STANDBY_CLONE:
do_standby_clone();
break;
case STANDBY_PROMOTE:
do_standby_promote();
break;
case STANDBY_FOLLOW:
do_standby_follow();
break;
case STANDBY_SWITCHOVER:
do_standby_switchover();
break;
case STANDBY_ARCHIVE_CONFIG:
do_standby_archive_config();
break;
case STANDBY_RESTORE_CONFIG:
do_standby_restore_config();
break;
case WITNESS_CREATE:
do_witness_create();
break;
case CLUSTER_SHOW:
do_cluster_show();
break;
case CLUSTER_CLEANUP:
do_cluster_cleanup();
break;
default:
/* An action will have been determined by this point */
break;
}
logger_shutdown();
return 0;
}
static void
do_cluster_show(void)
{
PGconn *conn;
PGresult *res;
char sqlquery[QUERY_STR_LEN];
char node_role[MAXLEN];
int i;
char name_header[MAXLEN];
char upstream_header[MAXLEN];
int name_length,
upstream_length,
conninfo_length = 0;
/* We need to connect to check configuration */
log_info(_("connecting to database\n"));
conn = establish_db_connection(options.conninfo, true);
sqlquery_snprintf(sqlquery,
"SELECT conninfo, type, name, upstream_node_name"
" FROM %s.repl_show_nodes",
get_repmgr_schema_quoted(conn));
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err(_("Unable to retrieve node information from the database\n%s\n"),
PQerrorMessage(conn));
log_hint(_("Please check that all nodes have been registered\n"));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
PQfinish(conn);
/* Format header nicely */
strncpy(name_header, _("Name"), MAXLEN);
strncpy(upstream_header, _("Upstream"), MAXLEN);
/*
* XXX if repmgr is ever localized into non-ASCII locales,
* use pg_wcssize() or similar to establish printed column length
*/
name_length = strlen(name_header);
upstream_length = strlen(upstream_header);
for (i = 0; i < PQntuples(res); i++)
{
int conninfo_length_cur, name_length_cur, upstream_length_cur;
conninfo_length_cur = strlen(PQgetvalue(res, i, 0));
if (conninfo_length_cur > conninfo_length)
conninfo_length = conninfo_length_cur;
name_length_cur = strlen(PQgetvalue(res, i, 2));
if (name_length_cur > name_length)
name_length = name_length_cur;
upstream_length_cur = strlen(PQgetvalue(res, i, 3));
if (upstream_length_cur > upstream_length)
upstream_length = upstream_length_cur;
}
printf("Role | %-*s | %-*s | Connection String\n", name_length, name_header, upstream_length, upstream_header);
printf("----------+-");
for (i = 0; i < name_length; i++)
printf("-");
printf("-|-");
for (i = 0; i < upstream_length; i++)
printf("-");
printf("-|-");
for (i = 0; i < conninfo_length; i++)
printf("-");
printf("\n");
for (i = 0; i < PQntuples(res); i++)
{
conn = establish_db_connection(PQgetvalue(res, i, 0), false);
if (PQstatus(conn) != CONNECTION_OK)
strcpy(node_role, " FAILED");
else if (strcmp(PQgetvalue(res, i, 1), "witness") == 0)
strcpy(node_role, " witness");
else if (is_standby(conn))
strcpy(node_role, " standby");
else
strcpy(node_role, "* master");
printf("%-10s", node_role);
printf("| %-*s ", name_length, PQgetvalue(res, i, 2));
printf("| %-*s ", upstream_length, PQgetvalue(res, i, 3));
printf("| %s\n", PQgetvalue(res, i, 0));
PQfinish(conn);
}
PQclear(res);
}
static void
do_cluster_cleanup(void)
{
PGconn *conn = NULL;
PGconn *master_conn = NULL;
PGresult *res;
char sqlquery[QUERY_STR_LEN];
int entries_to_delete = 0;
/* We need to connect to check configuration */
log_info(_("connecting to database\n"));
conn = establish_db_connection(options.conninfo, true);
/* check if there is a master in this cluster */
log_info(_("connecting to master database\n"));
master_conn = get_master_connection(conn, options.cluster_name,
NULL, NULL);
if (!master_conn)
{
log_err(_("cluster cleanup: cannot connect to master\n"));
PQfinish(conn);
exit(ERR_DB_CON);
}
PQfinish(conn);
log_debug(_("Number of days of monitoring history to retain: %i\n"), runtime_options.keep_history);
sqlquery_snprintf(sqlquery,
"SELECT COUNT(*) "
" FROM %s.repl_monitor "
" WHERE age(now(), last_monitor_time) >= '%d days'::interval ",
get_repmgr_schema_quoted(master_conn),
runtime_options.keep_history);
res = PQexec(master_conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err(_("cluster cleanup: unable to query number of monitoring records to clean up:\n%s\n"),
PQerrorMessage(master_conn));
PQclear(res);
PQfinish(master_conn);
exit(ERR_DB_QUERY);
}
entries_to_delete = atoi(PQgetvalue(res, 0, 0));
PQclear(res);
if (entries_to_delete == 0)
{
log_info(_("cluster cleanup: no monitoring records to delete\n"));
PQfinish(master_conn);
return;
}
log_debug(_("cluster cleanup: at least %i monitoring records to delete\n"), entries_to_delete);
if (runtime_options.keep_history > 0)
{
sqlquery_snprintf(sqlquery,
"DELETE FROM %s.repl_monitor "
" WHERE age(now(), last_monitor_time) >= '%d days'::interval ",
get_repmgr_schema_quoted(master_conn),
runtime_options.keep_history);
}
else
{
sqlquery_snprintf(sqlquery,
"TRUNCATE TABLE %s.repl_monitor",
get_repmgr_schema_quoted(master_conn));
}
res = PQexec(master_conn, sqlquery);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
log_err(_("cluster cleanup: unable to delete monitoring records\n%s\n"),
PQerrorMessage(master_conn));
PQclear(res);
PQfinish(master_conn);
exit(ERR_DB_QUERY);
}
PQclear(res);
/*
* Let's VACUUM the table to avoid autovacuum to be launched in an
* unexpected hour
*/
sqlquery_snprintf(sqlquery, "VACUUM %s.repl_monitor", get_repmgr_schema_quoted(master_conn));
res = PQexec(master_conn, sqlquery);
/* XXX There is any need to check this VACUUM happens without problems? */
PQclear(res);
PQfinish(master_conn);
if (runtime_options.keep_history > 0)
{
log_info(_("cluster cleanup: monitoring records older than %i day(s) deleted\n"), runtime_options.keep_history);
}
else
{
log_info(_("cluster cleanup: all monitoring records deleted\n"));
}
}
static void
do_master_register(void)
{
PGconn *conn;
PGconn *master_conn;
bool schema_exists = false;
int ret;
int primary_node_id = UNKNOWN_NODE_ID;
bool record_created;
conn = establish_db_connection(options.conninfo, true);
/* Verify that master is a supported server version */
log_info(_("connecting to master database\n"));
check_server_version(conn, "master", true, NULL);
/* Check we are a master */
log_verbose(LOG_INFO, _("connected to master, checking its state\n"));
ret = is_standby(conn);
if (ret)
{
log_err(_(ret == 1 ? "server is in standby mode and cannot be registered as a master\n" :
"connection to node lost!\n"));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Create schema and associated database objects, if it does not exist */
schema_exists = check_cluster_schema(conn);
if (!schema_exists)
{
log_info(_("master register: creating database objects inside the %s schema\n"),
get_repmgr_schema());
begin_transaction(conn);
if (!create_schema(conn))
{
log_err(_("Unable to create repmgr schema - see preceding error message(s); aborting\n"));
rollback_transaction(conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
commit_transaction(conn);
}
/* Ensure there isn't any other master already registered */
master_conn = get_master_connection(conn,
options.cluster_name, NULL, NULL);
if (master_conn != NULL && !runtime_options.force)
{
PQfinish(master_conn);
log_err(_("there is a master already in cluster %s\n"),
options.cluster_name);
exit(ERR_BAD_CONFIG);
}