/
repmgr.c
1587 lines (1406 loc) · 45.5 KB
/
repmgr.c
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/*
* repmgr.c - Command interpreter for the repmgr
* Copyright (C) 2ndQuadrant, 2010-2011
*
* This module is a command-line utility to easily setup a cluster of
* hot standby servers for an HA environment
*
* Commands implemented are.
* MASTER REGISTER, STANDBY REGISTER, STANDBY CLONE, STANDBY FOLLOW,
* STANDBY PROMOTE
*
* 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 <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "log.h"
#include "config.h"
#include "check_dir.h"
#include "strutil.h"
#define RECOVERY_FILE "recovery.conf"
#define RECOVERY_DONE_FILE "recovery.done"
#define NO_ACTION 0 /* Not a real action, just to initialize */
#define MASTER_REGISTER 1
#define STANDBY_REGISTER 2
#define STANDBY_CLONE 3
#define STANDBY_PROMOTE 4
#define STANDBY_FOLLOW 5
static void help(const char *progname);
static bool create_recovery_file(const char *data_dir, char *master_conninfo);
static int copy_remote_files(char *host, char *remote_user, char *remote_path,
char *local_path, bool is_directory);
static bool check_parameters_for_action(const int action);
static void do_master_register(void);
static void do_standby_register(void);
static void do_standby_clone(void);
static void do_standby_promote(void);
static void do_standby_follow(void);
static void help(const char* progname);
static void usage(void);
/* Global variables */
static const char *progname;
static const char *keywords[6];
static const char *values[6];
char repmgr_schema[MAXLEN];
bool need_a_node = true;
/* Initialization of runtime options */
t_runtime_options runtime_options = { "", "", "", "", "", "", DEFAULT_WAL_KEEP_SEGMENTS, false, false, "" };
t_configuration_options options = { "", -1, "", "", "" };
static char *server_mode = NULL;
static char *server_cmd = 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'},
{"dest-dir", required_argument, NULL, 'D'},
{"config-file", required_argument, NULL, 'f'},
{"remote-user", required_argument, NULL, 'R'},
{"wal-keep-segments", required_argument, NULL, 'w'},
{"force", no_argument, NULL, 'F'},
{"verbose", no_argument, NULL, 'v'},
{NULL, 0, NULL, 0}
};
int optindex;
int c;
int action = NO_ACTION;
progname = get_progname(argv[0]);
if (argc > 1)
{
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
{
help(progname);
exit(SUCCESS);
}
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
{
printf("%s (PostgreSQL) " PG_VERSION "\n", progname);
exit(SUCCESS);
}
}
while ((c = getopt_long(argc, argv, "d:h:p:U:D:f:R:w:F:v", long_options,
&optindex)) != -1)
{
switch (c)
{
case 'd':
strncpy(runtime_options.dbname, optarg, MAXLEN);
break;
case 'h':
strncpy(runtime_options.host, optarg, MAXLEN);
break;
case 'p':
if (atoi(optarg) > 0)
strncpy(runtime_options.masterport, optarg, MAXLEN);
break;
case 'U':
strncpy(runtime_options.username, optarg, MAXLEN);
break;
case 'D':
strncpy(runtime_options.dest_dir, optarg, MAXFILENAME);
break;
case 'f':
strncpy(runtime_options.config_file, optarg, MAXLEN);
break;
case 'R':
strncpy(runtime_options.remote_user, optarg, MAXLEN);
break;
case 'w':
if (atoi(optarg) > 0)
strncpy(runtime_options.wal_keep_segments, optarg, MAXLEN);
break;
case 'F':
runtime_options.force = true;
break;
case 'v':
runtime_options.verbose = true;
break;
default:
usage();
exit(ERR_BAD_CONFIG);
}
}
/*
* Now we need to obtain the action, this comes in one of these forms:
* MASTER REGISTER |
* STANDBY {REGISTER | CLONE [node] | PROMOTE | FOLLOW [node]}
*
* 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)
{
usage();
exit(ERR_BAD_CONFIG);
}
}
if (optind < argc)
{
server_cmd = argv[optind++];
if (strcasecmp(server_cmd, "REGISTER") == 0)
{
/*
* we don't use this info in any other place so i will
* just execute the compare again instead of having an
* additional variable to hold a value that we will use
* no more
*/
if (strcasecmp(server_mode, "MASTER") == 0)
action = MASTER_REGISTER;
else if (strcasecmp(server_mode, "STANDBY") == 0)
action = STANDBY_REGISTER;
}
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
{
usage();
exit(ERR_BAD_CONFIG);
}
}
/* For some actions we still can receive a last argument */
if (action == STANDBY_CLONE)
{
if (optind < argc)
{
if (runtime_options.host[0])
{
log_err(_("Conflicting parameters: you can't use -h while providing a node separately.\n"));
usage();
exit(ERR_BAD_CONFIG);
}
strncpy(runtime_options.host, argv[optind++], MAXLEN);
}
}
switch (optind < argc)
{
case 0:
break;
default:
log_err(_("%s: too many command-line arguments (first extra is \"%s\")\n"),
progname, argv[optind + 1]);
usage();
exit(ERR_BAD_CONFIG);
}
if (!check_parameters_for_action(action))
exit(ERR_BAD_CONFIG);
if (!runtime_options.dbname[0])
{
if (getenv("PGDATABASE"))
strncpy(runtime_options.dbname, getenv("PGDATABASE"), MAXLEN);
else if (getenv("PGUSER"))
strncpy(runtime_options.dbname, getenv("PGUSER"), MAXLEN);
else
strncpy(runtime_options.dbname, DEFAULT_DBNAME, MAXLEN);
}
/* Read the configuration file, normally repmgr.conf */
if (!runtime_options.config_file[0])
strncpy(runtime_options.config_file, DEFAULT_CONFIG_FILE, MAXLEN);
if (runtime_options.verbose)
printf(_("Opening configuration file: %s\n"), runtime_options.config_file);
parse_config(runtime_options.config_file, &options);
keywords[2] = "user";
values[2] = runtime_options.username;
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(progname, options.loglevel, options.logfacility);
if (runtime_options.verbose)
logger_min_verbose(LOG_INFO);
/*
* Node configuration information is not needed for all actions,
* with STANDBY CLONE being the main exception.
*/
if (need_a_node)
{
if (options.node == -1)
{
log_err("Node information is missing. "
"Check the configuration file.\n");
exit(ERR_BAD_CONFIG);
}
}
/* Prepare the repmgr schema variable */
snprintf(repmgr_schema, MAXLEN, "%s%s", DEFAULT_REPMGR_SCHEMA_PREFIX, options.cluster_name);
switch (action)
{
case MASTER_REGISTER:
do_master_register();
break;
case STANDBY_REGISTER:
do_standby_register();
break;
case STANDBY_CLONE:
do_standby_clone();
break;
case STANDBY_PROMOTE:
do_standby_promote();
break;
case STANDBY_FOLLOW:
do_standby_follow();
break;
default:
usage();
exit(ERR_BAD_CONFIG);
}
logger_shutdown();
return 0;
}
static void
do_master_register(void)
{
PGconn *conn;
PGresult *res;
char sqlquery[QUERY_STR_LEN];
bool schema_exists = false;
char schema_quoted[MAXLEN];
char master_version[MAXVERSIONSTR];
conn = establishDBConnection(options.conninfo, true);
/* master should be v9 or better */
pg_version(conn, master_version);
if (strcmp(master_version, "") == 0)
{
PQfinish(conn);
log_err( _("%s needs master to be PostgreSQL 9.0 or better\n"), progname);
return;
}
/* Check we are a master */
if (is_standby(conn))
{
log_err(_("%s needs master to be PostgreSQL 9.0 or better\n"), progname);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Assemble a quoted schema name
* XXX This is not currently used due to a merge conflict, but
* probably should be */
if (false)
{
char *identifier = PQescapeIdentifier(conn, repmgr_schema,
strlen(repmgr_schema));
maxlen_snprintf(schema_quoted, "%s", identifier);
PQfreemem(identifier);
}
/* Check if there is a schema for this cluster */
sqlquery_snprintf(sqlquery,
"SELECT 1 FROM pg_namespace "
"WHERE nspname = '%s'", repmgr_schema);
log_debug("master register: %s\n", sqlquery);
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err(_("Can't get info about schemas: %s\n"), PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
if (PQntuples(res) > 0) /* schema exists */
{
if (!runtime_options.force) /* and we are not forcing so error */
{
log_notice(_("Schema %s already exists.\n"), repmgr_schema);
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
schema_exists = true;
}
PQclear(res);
if (!schema_exists)
{
log_info("master register: creating database objects inside the %s schema", repmgr_schema);
/* ok, create the schema */
sqlquery_snprintf(sqlquery, "CREATE SCHEMA %s", repmgr_schema);
log_debug("master register: %s\n", sqlquery);
if (!PQexec(conn, sqlquery))
{
log_err(_("Cannot create the schema %s: %s\n"),
repmgr_schema, PQerrorMessage(conn));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* ... the tables */
sqlquery_snprintf(sqlquery, "CREATE TABLE %s.repl_nodes ( "
" id integer primary key, "
" cluster text not null, "
" conninfo text not null)", repmgr_schema);
log_debug("master register: %s\n", sqlquery);
if (!PQexec(conn, sqlquery))
{
log_err(_("Cannot create the table %s.repl_nodes: %s\n"),
repmgr_schema, PQerrorMessage(conn));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
sqlquery_snprintf(sqlquery, "CREATE TABLE %s.repl_monitor ( "
" primary_node INTEGER NOT NULL, "
" standby_node INTEGER NOT NULL, "
" last_monitor_time TIMESTAMP WITH TIME ZONE NOT NULL, "
" last_wal_primary_location TEXT NOT NULL, "
" last_wal_standby_location TEXT NOT NULL, "
" replication_lag BIGINT NOT NULL, "
" apply_lag BIGINT NOT NULL) ", repmgr_schema);
log_debug("master register: %s\n", sqlquery);
if (!PQexec(conn, sqlquery))
{
log_err(_("Cannot create the table %s.repl_monitor: %s\n"),
repmgr_schema, PQerrorMessage(conn));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* and the view */
sqlquery_snprintf(sqlquery, "CREATE VIEW %s.repl_status AS "
" WITH monitor_info AS (SELECT *, ROW_NUMBER() OVER (PARTITION BY primary_node, standby_node "
" ORDER BY last_monitor_time desc) "
" FROM %s.repl_monitor) "
" SELECT primary_node, standby_node, last_monitor_time, last_wal_primary_location, "
" last_wal_standby_location, pg_size_pretty(replication_lag) replication_lag, "
" pg_size_pretty(apply_lag) apply_lag, age(now(), last_monitor_time) AS time_lag "
" FROM monitor_info a "
" WHERE row_number = 1", repmgr_schema, repmgr_schema);
log_debug("master register: %s\n", sqlquery);
if (!PQexec(conn, sqlquery))
{
log_err(_("Cannot create the view %s.repl_status: %s\n"),
repmgr_schema, PQerrorMessage(conn));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
}
else
{
PGconn *master_conn;
int id;
/* Ensure there isn't any other master already registered */
master_conn = getMasterConnection(conn, options.node,
options.cluster_name, &id,NULL);
if (master_conn != NULL)
{
PQfinish(master_conn);
log_warning(_("There is a master already in cluster %s\n"), options.cluster_name);
exit(ERR_BAD_CONFIG);
}
}
/* Now register the master */
if (runtime_options.force)
{
sqlquery_snprintf(sqlquery, "DELETE FROM %s.repl_nodes "
" WHERE id = %d",
repmgr_schema, options.node);
log_debug("master register: %s\n", sqlquery);
if (!PQexec(conn, sqlquery))
{
log_warning(_("Cannot delete node details, %s\n"),
PQerrorMessage(conn));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
}
sqlquery_snprintf(sqlquery, "INSERT INTO %s.repl_nodes "
"VALUES (%d, '%s', '%s')",
repmgr_schema, options.node, options.cluster_name, options.conninfo);
log_debug("master register: %s\n", sqlquery);
if (!PQexec(conn, sqlquery))
{
log_warning(_("Cannot insert node details, %s\n"),
PQerrorMessage(conn));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
PQfinish(conn);
log_notice(_("Master node correctly registered for cluster %s with id %d (conninfo: %s)\n"),
options.cluster_name, options.node, options.conninfo);
return;
}
static void
do_standby_register(void)
{
PGconn *conn;
PGconn *master_conn;
int master_id;
PGresult *res;
char sqlquery[QUERY_STR_LEN];
char schema_quoted[MAXLEN];
char master_version[MAXVERSIONSTR];
char standby_version[MAXVERSIONSTR];
conn = establishDBConnection(options.conninfo, true);
/* XXX: A lot of copied code from do_master_register! Refactor */
/* should be v9 or better */
pg_version(conn, standby_version);
if (strcmp(standby_version, "") == 0)
{
PQfinish(conn);
log_err(_("%s needs standby to be PostgreSQL 9.0 or better\n"), progname);
exit(ERR_BAD_CONFIG);
}
/* Check we are a standby */
if (!is_standby(conn))
{
log_err(_("repmgr: This node should be a standby (%s)\n"), options.conninfo);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
/* Assemble a quoted schema name
* XXX This is not currently used due to a merge conflict, but
* probably should be */
if (false)
{
char *identifier = PQescapeIdentifier(conn, repmgr_schema,
strlen(repmgr_schema));
maxlen_snprintf(schema_quoted, "%s", identifier);
PQfreemem(identifier);
}
/* Check if there is a schema for this cluster */
sqlquery_snprintf(sqlquery, "SELECT 1 FROM pg_namespace WHERE nspname = '%s'", repmgr_schema);
log_debug("standby register: %s\n", sqlquery);
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err("Can't get info about tablespaces: %s\n", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
if (PQntuples(res) == 0)
{
/* schema doesn't exist */
log_err("Schema %s doesn't exists.\n", repmgr_schema);
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
PQclear(res);
/* check if there is a master in this cluster */
master_conn = getMasterConnection(conn, options.node, options.cluster_name,
&master_id, NULL);
if (!master_conn)
{
log_err(_("A master must be defined before configuring a slave\n"));
exit(ERR_BAD_CONFIG);
}
/* master should be v9 or better */
pg_version(master_conn, master_version);
if (strcmp(master_version, "") == 0)
{
PQfinish(conn);
PQfinish(master_conn);
log_err(_("%s needs master to be PostgreSQL 9.0 or better\n"), progname);
exit(ERR_BAD_CONFIG);
}
/* master and standby version should match */
if (strcmp(master_version, standby_version) != 0)
{
PQfinish(conn);
PQfinish(master_conn);
log_err(_("%s needs versions of both master (%s) and standby (%s) to match.\n"),
progname, master_version, standby_version);
exit(ERR_BAD_CONFIG);
}
/* Now register the standby */
if (runtime_options.force)
{
sqlquery_snprintf(sqlquery, "DELETE FROM %s.repl_nodes "
" WHERE id = %d",
repmgr_schema, options.node);
log_debug("standby register: %s\n", sqlquery);
if (!PQexec(master_conn, sqlquery))
{
log_err("Cannot delete node details, %s\n",
PQerrorMessage(master_conn));
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
}
sqlquery_snprintf(sqlquery, "INSERT INTO %s.repl_nodes "
"VALUES (%d, '%s', '%s')",
repmgr_schema, options.node, options.cluster_name, options.conninfo);
log_debug("standby register: %s\n", sqlquery);
if (!PQexec(master_conn, sqlquery))
{
log_err("Cannot insert node details, %s\n",
PQerrorMessage(master_conn));
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
PQfinish(master_conn);
PQfinish(conn);
return;
}
static void
do_standby_clone(void)
{
PGconn *conn;
PGresult *res;
char sqlquery[QUERY_STR_LEN];
int r = 0;
int i;
bool pg_dir = false;
char master_data_directory[MAXFILENAME];
char master_config_file[MAXFILENAME];
char master_hba_file[MAXFILENAME];
char master_ident_file[MAXFILENAME];
char master_control_file[MAXFILENAME];
char local_control_file[MAXFILENAME];
char tblspc_dir[MAXFILENAME];
char *first_wal_segment = NULL;
const char *last_wal_segment = NULL;
char master_version[MAXVERSIONSTR];
/* if dest_dir hasn't been provided, initialize to current directory */
if (!runtime_options.dest_dir[0])
{
strncpy(runtime_options.dest_dir, DEFAULT_DEST_DIR, MAXFILENAME);
}
/* Check this directory could be used as a PGDATA dir */
switch (check_dir(runtime_options.dest_dir))
{
case 0:
/* dest_dir not there, must create it */
log_info(_("creating directory %s ...\n"), runtime_options.dest_dir);
if (!create_directory(runtime_options.dest_dir))
{
log_err(_("%s: couldn't create directory %s ...\n"),
progname, runtime_options.dest_dir);
exit(ERR_BAD_CONFIG);
}
break;
case 1:
/* Present but empty, fix permissions and use it */
log_info(_("checking and correcting permissions on existing directory %s ...\n"),
runtime_options.dest_dir);
if (!set_directory_permissions(runtime_options.dest_dir))
{
log_err(_("%s: could not change permissions of directory \"%s\": %s\n"),
progname, runtime_options.dest_dir, strerror(errno));
exit(ERR_BAD_CONFIG);
}
break;
case 2:
/* Present and not empty */
log_warning( _("%s: directory \"%s\" exists but is not empty\n"),
progname, runtime_options.dest_dir);
pg_dir = is_pg_dir(runtime_options.dest_dir);
if (pg_dir && !runtime_options.force)
{
log_warning( _("\nThis looks like a PostgreSQL directory.\n"
"If you are sure you want to clone here, "
"please check there is no PostgreSQL server "
"running and use the --force option\n"));
exit(ERR_BAD_CONFIG);
}
else if (pg_dir && runtime_options.force)
{
/* Let it continue */
break;
}
else
return;
default:
/* Trouble accessing directory */
log_err( _("%s: could not access directory \"%s\": %s\n"),
progname, runtime_options.dest_dir, strerror(errno));
exit(ERR_BAD_CONFIG);
}
/* Connection parameters for master only */
keywords[0] = "host";
values[0] = runtime_options.host;
keywords[1] = "port";
values[1] = runtime_options.masterport;
/* We need to connect to check configuration and start a backup */
log_info(_("%s connecting to master database\n"), progname);
conn = PQconnectdbParams(keywords, values, true);
if (!conn)
{
log_err(_("%s: could not connect to master\n"),
progname);
exit(ERR_BAD_CONFIG);
}
/* primary should be v9 or better */
log_info(_("%s connected to master, checking its state\n"), progname);
pg_version(conn, master_version);
if (strcmp(master_version, "") == 0)
{
PQfinish(conn);
log_err(_("%s needs master to be PostgreSQL 9.0 or better\n"), progname);
exit(ERR_BAD_CONFIG);
}
/* Check we are cloning a primary node */
if (is_standby(conn))
{
PQfinish(conn);
log_err(_("\nThe command should clone a primary node\n"));
exit(ERR_BAD_CONFIG);
}
/* And check if it is well configured */
if (!guc_setted(conn, "wal_level", "=", "hot_standby"))
{
PQfinish(conn);
log_err(_("%s needs parameter 'wal_level' to be set to 'hot_standby'\n"), progname);
exit(ERR_BAD_CONFIG);
}
if (!guc_setted(conn, "wal_keep_segments", ">=", runtime_options.wal_keep_segments))
{
PQfinish(conn);
log_err(_("%s needs parameter 'wal_keep_segments' to be set to %s or greater (see the '-w' option)\n"), progname, runtime_options.wal_keep_segments);
exit(ERR_BAD_CONFIG);
}
if (!guc_setted(conn, "archive_mode", "=", "on"))
{
PQfinish(conn);
log_err(_("%s needs parameter 'archive_mode' to be set to 'on'\n"), progname);
exit(ERR_BAD_CONFIG);
}
log_info(_("Succesfully connected to primary. Current installation size is %s\n"), get_cluster_size(conn));
/*
* Check if the tablespace locations exists and that we can write to
* them.
*/
sqlquery_snprintf(sqlquery,
"SELECT spclocation "
" FROM pg_tablespace "
"WHERE spcname NOT IN ('pg_default', 'pg_global')");
log_debug("standby clone: %s\n", sqlquery);
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err("Can't get info about tablespaces: %s\n", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
for (i = 0; i < PQntuples(res); i++)
{
strncpy(tblspc_dir, PQgetvalue(res, i, 0), MAXFILENAME);
/* Check this directory could be used as a PGDATA dir */
switch (check_dir(tblspc_dir))
{
case 0:
/* tblspc_dir not there, must create it */
log_info(_("creating directory \"%s\"... "), tblspc_dir);
if (!create_directory(tblspc_dir))
{
log_err(_("%s: couldn't create directory \"%s\"...\n"),
progname, tblspc_dir);
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
break;
case 1:
/* Present but empty, fix permissions and use it */
log_info(_("fixing permissions on existing directory \"%s\"... "),
tblspc_dir);
if (!set_directory_permissions(tblspc_dir))
{
log_err(_("%s: could not change permissions of directory \"%s\": %s\n"),
progname, tblspc_dir, strerror(errno));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
break;
case 2:
/* Present and not empty */
if (!runtime_options.force)
{
log_err(_("%s: directory \"%s\" exists but is not empty\n"),
progname, tblspc_dir);
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
default:
/* Trouble accessing directory */
log_err(_("%s: could not access directory \"%s\": %s\n"),
progname, tblspc_dir, strerror(errno));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
}
log_notice("Starting backup...\n");
/* Get the data directory full path and the configuration files location */
sqlquery_snprintf(sqlquery,
"SELECT name, setting "
" FROM pg_settings "
" WHERE name IN ('data_directory', 'config_file', 'hba_file', 'ident_file')");
log_debug("standby clone: %s\n", sqlquery);
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err("Can't get info about data directory and configuration files: %s\n", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
for (i = 0; i < PQntuples(res); i++)
{
if (strcmp(PQgetvalue(res, i, 0), "data_directory") == 0)
strncpy(master_data_directory, PQgetvalue(res, i, 1), MAXFILENAME);
else if (strcmp(PQgetvalue(res, i, 0), "config_file") == 0)
strncpy(master_config_file, PQgetvalue(res, i, 1), MAXFILENAME);
else if (strcmp(PQgetvalue(res, i, 0), "hba_file") == 0)
strncpy(master_hba_file, PQgetvalue(res, i, 1), MAXFILENAME);
else if (strcmp(PQgetvalue(res, i, 0), "ident_file") == 0)
strncpy(master_ident_file, PQgetvalue(res, i, 1), MAXFILENAME);
else
log_warning(_("unknown parameter: %s\n"), PQgetvalue(res, i, 0));
}
PQclear(res);
/*
* inform the master we will start a backup and get the first XLog filename
* so we can say to the user we need those files
*/
sqlquery_snprintf(
sqlquery,
"SELECT pg_xlogfile_name(pg_start_backup('repmgr_standby_clone_%ld'))",
time(NULL));
log_debug("standby clone: %s\n", sqlquery);
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err("Can't start backup: %s\n", PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
if (runtime_options.verbose)
{
char *first_wal_seg_pq = PQgetvalue(res, 0, 0);
size_t buf_sz = strlen(first_wal_seg_pq);
first_wal_segment = malloc(buf_sz + 1);
xsnprintf(first_wal_segment, buf_sz + 1, "%s", first_wal_seg_pq);
}
PQclear(res);
/*
* 1) first move global/pg_control
*
* 2) then move data_directory ommiting the files we have already moved and
* pg_xlog content
*
* 3) finally We need to backup configuration files (that could be on other
* directories, debian like systems likes to do that), so look at
* config_file, hba_file and ident_file but we can omit
* external_pid_file ;)
*
* On error we need to return but before that execute pg_stop_backup()
*/
/* need to create the global sub directory */
maxlen_snprintf(master_control_file, "%s/global/pg_control",
master_data_directory);
maxlen_snprintf(local_control_file, "%s/global", runtime_options.dest_dir);
if (!create_directory(local_control_file))
{
log_err(_("%s: couldn't create directory %s ...\n"),
progname, runtime_options.dest_dir);
goto stop_backup;
}
log_info("standby clone: master control file '%s'\n", master_control_file);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
master_control_file, local_control_file, false);
if (r != 0)
{
log_warning("standby clone: failed copying master control file '%s'\n", master_control_file);
goto stop_backup;
}
log_info("standby clone: master data directory '%s'\n", master_data_directory);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
master_data_directory, runtime_options.dest_dir, true);
if (r != 0)
{
log_warning("standby clone: failed copying master data directory '%s'\n", master_data_directory);
goto stop_backup;
}
/*
* Copy tablespace locations, i'm doing this separately because i couldn't
* find and appropiate rsync option but besides we could someday make all
* these rsync happen concurrently
*/
sqlquery_snprintf(sqlquery,
"SELECT spclocation "
" FROM pg_tablespace "
" WHERE spcname NOT IN ('pg_default', 'pg_global')");
log_debug("standby clone: %s\n", sqlquery);
res = PQexec(conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err("Can't get info about tablespaces: %s\n", PQerrorMessage(conn));
PQclear(res);
goto stop_backup;
}
for (i = 0; i < PQntuples(res); i++)
{
strncpy(tblspc_dir, PQgetvalue(res, i, 0), MAXFILENAME);
log_info("standby clone: master tablespace '%s'\n", tblspc_dir);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
tblspc_dir, tblspc_dir, true);
if (r != 0)
{
log_warning("standby clone: failed copying tablespace directory '%s'\n", tblspc_dir);
goto stop_backup;
}
}
log_info("standby clone: master config file '%s'\n", master_config_file);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user,
master_config_file, runtime_options.dest_dir, false);
if (r != 0)
{
log_warning("standby clone: failed copying master config file '%s'\n", master_config_file);
goto stop_backup;
}
log_info("standby clone: master hba file '%s'\n", master_hba_file);
r = copy_remote_files(runtime_options.host, runtime_options.remote_user, master_hba_file, runtime_options.dest_dir, false);
if (r != 0)
{
log_warning("standby clone: failed copying master hba file '%s'\n", master_hba_file);