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repmgr-action-node.c
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/*
* repmgr-action-node.c
*
* Implements actions available for any kind of node
*
* Copyright (c) 2ndQuadrant, 2010-2018
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/stat.h>
#include <dirent.h>
#include "repmgr.h"
#include "controldata.h"
#include "dirutil.h"
#include "dbutils.h"
#include "compat.h"
#include "repmgr-client-global.h"
#include "repmgr-action-node.h"
#include "repmgr-action-standby.h"
static bool copy_file(const char *src_file, const char *dest_file);
static void format_archive_dir(PQExpBufferData *archive_dir);
static t_server_action parse_server_action(const char *action);
static void _do_node_service_list_actions(t_server_action action);
static void _do_node_status_is_shutdown_cleanly(void);
static void _do_node_archive_config(void);
static void _do_node_restore_config(void);
static void do_node_check_replication_connection(void);
static CheckStatus do_node_check_archive_ready(PGconn *conn, OutputMode mode, CheckStatusList *list_output);
static CheckStatus do_node_check_downstream(PGconn *conn, OutputMode mode, CheckStatusList *list_output);
static CheckStatus do_node_check_replication_lag(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output);
static CheckStatus do_node_check_role(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output);
static CheckStatus do_node_check_slots(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output);
/*
* NODE STATUS
*
* Can only be run on the local node, as it needs to be able to
* read the data directory.
*
* Parameters:
* --is-shutdown-cleanly (for internal use only)
* --csv
*/
void
do_node_status(void)
{
PGconn *conn = NULL;
t_node_info node_info = T_NODE_INFO_INITIALIZER;
char server_version[MAXLEN];
char cluster_size[MAXLEN];
PQExpBufferData output;
KeyValueList node_status = {NULL, NULL};
KeyValueListCell *cell = NULL;
ItemList warnings = {NULL, NULL};
RecoveryType recovery_type = RECTYPE_UNKNOWN;
ReplInfo replication_info = T_REPLINFO_INTIALIZER;
t_recovery_conf recovery_conf = T_RECOVERY_CONF_INITIALIZER;
char data_dir[MAXPGPATH] = "";
if (runtime_options.is_shutdown_cleanly == true)
{
return _do_node_status_is_shutdown_cleanly();
}
/* config file required, so we should have "conninfo" and "data_directory" */
conn = establish_db_connection(config_file_options.conninfo, true);
strncpy(data_dir, config_file_options.data_directory, MAXPGPATH);
server_version_num = get_server_version(conn, NULL);
/* Check node exists and is really a standby */
if (get_node_record_with_upstream(conn, config_file_options.node_id, &node_info) != RECORD_FOUND)
{
log_error(_("no record found for node %i"), config_file_options.node_id);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
(void) get_server_version(conn, server_version);
if (get_cluster_size(conn, cluster_size) == false)
strncpy(cluster_size, _("unknown"), MAXLEN);
recovery_type = get_recovery_type(conn);
get_node_replication_stats(conn, server_version_num, &node_info);
key_value_list_set(
&node_status,
"PostgreSQL version",
server_version);
key_value_list_set(
&node_status,
"Total data size",
cluster_size);
key_value_list_set(
&node_status,
"Conninfo",
node_info.conninfo);
if (runtime_options.verbose == true)
{
uint64 local_system_identifier = UNKNOWN_SYSTEM_IDENTIFIER;
local_system_identifier = get_system_identifier(config_file_options.data_directory);
key_value_list_set_format(
&node_status,
"System identifier",
"%lu", local_system_identifier);
}
key_value_list_set(
&node_status,
"Role",
get_node_type_string(node_info.type));
switch (node_info.type)
{
case PRIMARY:
if (recovery_type == RECTYPE_STANDBY)
{
item_list_append(
&warnings,
_("- node is registered as primary but running as standby"));
}
break;
case STANDBY:
if (recovery_type == RECTYPE_PRIMARY)
{
item_list_append(
&warnings,
_("- node is registered as standby but running as primary"));
}
break;
case BDR:
default:
break;
}
if (guc_set(conn, "archive_mode", "=", "off"))
{
key_value_list_set(
&node_status,
"WAL archiving",
"off");
key_value_list_set(
&node_status,
"Archive command",
"(none)");
}
else
{
bool enabled = true;
PQExpBufferData archiving_status;
char archive_command[MAXLEN] = "";
initPQExpBuffer(&archiving_status);
if (recovery_type == RECTYPE_STANDBY)
{
if (guc_set(conn, "archive_mode", "=", "on"))
enabled = false;
}
if (enabled == true)
{
appendPQExpBuffer(&archiving_status, "enabled");
}
else
{
appendPQExpBuffer(&archiving_status, "disabled");
}
if (enabled == false && recovery_type == RECTYPE_STANDBY)
{
appendPQExpBuffer(&archiving_status, " (on standbys \"archive_mode\" must be set to \"always\" to be effective)");
}
key_value_list_set(
&node_status,
"WAL archiving",
archiving_status.data);
termPQExpBuffer(&archiving_status);
get_pg_setting(conn, "archive_command", archive_command);
key_value_list_set(
&node_status,
"Archive command",
archive_command);
}
{
int ready_files;
ready_files = get_ready_archive_files(conn, data_dir);
if (runtime_options.output_mode == OM_CSV)
{
key_value_list_set_format(
&node_status,
"WALs pending archiving",
"%i",
ready_files);
}
else
{
key_value_list_set_format(
&node_status,
"WALs pending archiving",
"%i pending files",
ready_files);
}
if (guc_set(conn, "archive_mode", "=", "off"))
{
key_value_list_set_output_mode(&node_status, "WALs pending archiving", OM_CSV);
}
}
if (node_info.max_wal_senders >= 0)
{
/* In CSV mode, raw values supplied as well */
key_value_list_set_format(&node_status,
"Replication connections",
"%i (of maximal %i)",
node_info.attached_wal_receivers,
node_info.max_wal_senders);
}
else if (node_info.max_wal_senders == 0)
{
key_value_list_set_format(&node_status,
"Replication connections",
"disabled");
}
if (server_version_num < 90400)
{
key_value_list_set(&node_status,
"Replication slots",
"not available");
}
else if (node_info.max_replication_slots > 0)
{
PQExpBufferData slotinfo;
initPQExpBuffer(&slotinfo);
appendPQExpBuffer(&slotinfo,
"%i (of maximal %i)",
node_info.active_replication_slots + node_info.inactive_replication_slots,
node_info.max_replication_slots);
if (node_info.inactive_replication_slots > 0)
{
appendPQExpBuffer(&slotinfo,
"; %i inactive",
node_info.inactive_replication_slots);
item_list_append_format(&warnings,
_("- node has %i inactive replication slots"),
node_info.inactive_replication_slots);
}
key_value_list_set(&node_status,
"Replication slots",
slotinfo.data);
termPQExpBuffer(&slotinfo);
}
else if (node_info.max_replication_slots == 0)
{
key_value_list_set(&node_status,
"Replication slots",
"disabled");
}
/*
* check for missing replication slots - we do this regardless of
* what "max_replication_slots" is set to, in case the downstream
* node was configured with "use_replication_slots=true" and is
* expecting a replication slot to be available
*/
{
NodeInfoList missing_slots = T_NODE_INFO_LIST_INITIALIZER;
get_downstream_nodes_with_missing_slot(conn,
config_file_options.node_id,
&missing_slots);
if (missing_slots.node_count > 0)
{
NodeInfoListCell *missing_slot_cell = NULL;
item_list_append_format(&warnings,
_("- replication slots missing for following %i node(s):"),
missing_slots.node_count);
for (missing_slot_cell = missing_slots.head; missing_slot_cell; missing_slot_cell = missing_slot_cell->next)
{
item_list_append_format(&warnings,
_(" - %s (ID: %i, slot name: \"%s\")"),
missing_slot_cell->node_info->node_name,
missing_slot_cell->node_info->node_id,
missing_slot_cell->node_info->slot_name);
}
}
}
if (node_info.type == STANDBY)
{
key_value_list_set_format(&node_status,
"Upstream node",
"%s (ID: %i)",
node_info.upstream_node_name,
node_info.upstream_node_id);
get_replication_info(conn, &replication_info);
key_value_list_set_format(&node_status,
"Replication lag",
"%i seconds",
replication_info.replication_lag_time);
key_value_list_set_format(&node_status,
"Last received LSN",
"%X/%X", format_lsn(replication_info.last_wal_receive_lsn));
key_value_list_set_format(&node_status,
"Last replayed LSN",
"%X/%X", format_lsn(replication_info.last_wal_replay_lsn));
}
else
{
key_value_list_set(&node_status,
"Upstream node",
"(none)");
key_value_list_set_output_mode(&node_status,
"Upstream node",
OM_CSV);
key_value_list_set(&node_status,
"Replication lag",
"n/a");
key_value_list_set(&node_status,
"Last received LSN",
"(none)");
key_value_list_set_output_mode(&node_status,
"Last received LSN",
OM_CSV);
key_value_list_set(&node_status,
"Last replayed LSN",
"(none)");
key_value_list_set_output_mode(&node_status,
"Last replayed LSN",
OM_CSV);
}
parse_recovery_conf(data_dir, &recovery_conf);
/* format output */
initPQExpBuffer(&output);
if (runtime_options.output_mode == OM_CSV)
{
appendPQExpBuffer(&output,
"\"Node name\",\"%s\"\n",
node_info.node_name);
appendPQExpBuffer(&output,
"\"Node ID\",\"%i\"\n",
node_info.node_id);
for (cell = node_status.head; cell; cell = cell->next)
{
appendPQExpBuffer(&output,
"\"%s\",\"%s\"\n",
cell->key, cell->value);
}
/* we'll add the raw data as well */
appendPQExpBuffer(&output,
"\"max_wal_senders\",%i\n",
node_info.max_wal_senders);
appendPQExpBuffer(&output,
"\"occupied_wal_senders\",%i\n",
node_info.attached_wal_receivers);
appendPQExpBuffer(&output,
"\"max_replication_slots\",%i\n",
node_info.max_replication_slots);
appendPQExpBuffer(&output,
"\"active_replication_slots\",%i\n",
node_info.active_replication_slots);
appendPQExpBuffer(&output,
"\"inactive_replaction_slots\",%i\n",
node_info.inactive_replication_slots);
}
else
{
appendPQExpBuffer(&output,
"Node \"%s\":\n",
node_info.node_name);
for (cell = node_status.head; cell; cell = cell->next)
{
if (cell->output_mode == OM_NOT_SET)
appendPQExpBuffer(&output,
"\t%s: %s\n",
cell->key, cell->value);
}
}
puts(output.data);
termPQExpBuffer(&output);
if (warnings.head != NULL && runtime_options.terse == false)
{
log_warning(_("following issue(s) were detected:"));
print_item_list(&warnings);
/* add this when functionality implemented */
/* log_hint(_("execute \"repmgr node check\" for more details")); */
}
key_value_list_free(&node_status);
item_list_free(&warnings);
PQfinish(conn);
}
/*
* Returns information about the running state of the node.
* For internal use during "standby switchover".
*
* Returns "longopt" output:
*
* --status=(RUNNING|SHUTDOWN|UNCLEAN_SHUTDOWN|UNKNOWN)
* --last-checkpoint=...
*/
static
void
_do_node_status_is_shutdown_cleanly(void)
{
PGPing ping_status;
PQExpBufferData output;
DBState db_state;
XLogRecPtr checkPoint = InvalidXLogRecPtr;
NodeStatus node_status = NODE_STATUS_UNKNOWN;
initPQExpBuffer(&output);
appendPQExpBuffer(&output,
"--state=");
/* sanity-check we're dealing with a PostgreSQL directory */
if (is_pg_dir(config_file_options.data_directory) == false)
{
appendPQExpBuffer(&output, "UNKNOWN");
printf("%s\n", output.data);
termPQExpBuffer(&output);
return;
}
ping_status = PQping(config_file_options.conninfo);
switch (ping_status)
{
case PQPING_OK:
node_status = NODE_STATUS_UP;
break;
case PQPING_REJECT:
node_status = NODE_STATUS_UP;
break;
case PQPING_NO_ATTEMPT:
case PQPING_NO_RESPONSE:
/* status not yet clear */
break;
}
/* check what pg_controldata says */
db_state = get_db_state(config_file_options.data_directory);
log_verbose(LOG_DEBUG, "db state now: %s", describe_db_state(db_state));
if (db_state != DB_SHUTDOWNED && db_state != DB_SHUTDOWNED_IN_RECOVERY)
{
if (node_status != NODE_STATUS_UP)
{
node_status = NODE_STATUS_UNCLEAN_SHUTDOWN;
}
/* server is still responding but shutting down */
else if (db_state == DB_SHUTDOWNING)
{
node_status = NODE_STATUS_SHUTTING_DOWN;
}
}
checkPoint = get_latest_checkpoint_location(config_file_options.data_directory);
/* unable to read pg_control, don't know what's happening */
if (checkPoint == InvalidXLogRecPtr)
{
node_status = NODE_STATUS_UNKNOWN;
}
/*
* if still "UNKNOWN" at this point, then the node must be cleanly shut
* down
*/
else if (node_status == NODE_STATUS_UNKNOWN)
{
node_status = NODE_STATUS_DOWN;
}
log_verbose(LOG_DEBUG, "node status determined as: %s", print_node_status(node_status));
switch (node_status)
{
case NODE_STATUS_UP:
appendPQExpBuffer(&output, "RUNNING");
break;
case NODE_STATUS_SHUTTING_DOWN:
appendPQExpBuffer(&output, "SHUTTING_DOWN");
break;
case NODE_STATUS_DOWN:
appendPQExpBuffer(&output,
"SHUTDOWN --last-checkpoint-lsn=%X/%X",
format_lsn(checkPoint));
break;
case NODE_STATUS_UNCLEAN_SHUTDOWN:
appendPQExpBuffer(&output, "UNCLEAN_SHUTDOWN");
break;
case NODE_STATUS_UNKNOWN:
appendPQExpBuffer(&output, "UNKNOWN");
break;
}
printf("%s\n", output.data);
termPQExpBuffer(&output);
return;
}
/*
* Configuration file required
*/
void
do_node_check(void)
{
PGconn *conn = NULL;
PQExpBufferData output;
t_node_info node_info = T_NODE_INFO_INITIALIZER;
CheckStatus return_code;
CheckStatusList status_list = {NULL, NULL};
CheckStatusListCell *cell = NULL;
/* internal */
if (runtime_options.has_passfile == true)
{
return_code = has_passfile() ? 0 : 1;
exit(return_code);
}
if (runtime_options.replication_connection == true)
{
do_node_check_replication_connection();
exit(SUCCESS);
}
if (strlen(config_file_options.conninfo))
conn = establish_db_connection(config_file_options.conninfo, true);
else
conn = establish_db_connection_by_params(&source_conninfo, true);
if (get_node_record(conn, config_file_options.node_id, &node_info) != RECORD_FOUND)
{
log_error(_("no record found for node %i"), config_file_options.node_id);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
server_version_num = get_server_version(conn, NULL);
/* add replication statistics to node record */
get_node_replication_stats(conn, server_version_num, &node_info);
/*
* handle specific checks ======================
*/
if (runtime_options.archive_ready == true)
{
return_code = do_node_check_archive_ready(conn,
runtime_options.output_mode,
NULL);
PQfinish(conn);
exit(return_code);
}
if (runtime_options.downstream == true)
{
return_code = do_node_check_downstream(conn,
runtime_options.output_mode,
NULL);
PQfinish(conn);
exit(return_code);
}
if (runtime_options.replication_lag == true)
{
return_code = do_node_check_replication_lag(conn,
runtime_options.output_mode,
&node_info,
NULL);
PQfinish(conn);
exit(return_code);
}
if (runtime_options.role == true)
{
return_code = do_node_check_role(conn,
runtime_options.output_mode,
&node_info,
NULL);
PQfinish(conn);
exit(return_code);
}
if (runtime_options.slots == true)
{
return_code = do_node_check_slots(conn,
runtime_options.output_mode,
&node_info,
NULL);
PQfinish(conn);
exit(return_code);
}
if (runtime_options.output_mode == OM_NAGIOS)
{
log_error(_("--nagios can only be used with a specific check"));
log_hint(_("execute \"repmgr node --help\" for details"));
PQfinish(conn);
return;
}
/* output general overview */
initPQExpBuffer(&output);
/* order functions are called is also output order */
(void) do_node_check_role(conn, runtime_options.output_mode, &node_info, &status_list);
(void) do_node_check_replication_lag(conn, runtime_options.output_mode, &node_info, &status_list);
(void) do_node_check_archive_ready(conn, runtime_options.output_mode, &status_list);
(void) do_node_check_downstream(conn, runtime_options.output_mode, &status_list);
(void) do_node_check_slots(conn, runtime_options.output_mode, &node_info, &status_list);
if (runtime_options.output_mode == OM_CSV)
{
/* TODO */
}
else
{
appendPQExpBuffer(
&output,
"Node \"%s\":\n",
node_info.node_name);
for (cell = status_list.head; cell; cell = cell->next)
{
appendPQExpBuffer(
&output,
"\t%s: %s",
cell->item,
output_check_status(cell->status));
if (strlen(cell->details))
{
appendPQExpBuffer(
&output,
" (%s)",
cell->details);
}
appendPQExpBuffer(&output, "\n");
}
}
printf("%s", output.data);
termPQExpBuffer(&output);
check_status_list_free(&status_list);
PQfinish(conn);
}
static CheckStatus
do_node_check_role(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output)
{
CheckStatus status = CHECK_STATUS_OK;
PQExpBufferData details;
RecoveryType recovery_type = get_recovery_type(conn);
if (mode == OM_CSV)
{
log_error(_("--csv output not provided with --role option"));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
initPQExpBuffer(&details);
switch (node_info->type)
{
case PRIMARY:
if (recovery_type == RECTYPE_STANDBY)
{
status = CHECK_STATUS_CRITICAL;
appendPQExpBuffer(&details,
_("node is registered as primary but running as standby"));
}
else
{
appendPQExpBuffer(&details,
_("node is primary"));
}
break;
case STANDBY:
if (recovery_type == RECTYPE_PRIMARY)
{
status = CHECK_STATUS_CRITICAL;
appendPQExpBuffer(&details,
_("node is registered as standby but running as primary"));
}
else
{
appendPQExpBuffer(&details,
_("node is standby"));
}
break;
case BDR:
{
PQExpBufferData output;
initPQExpBuffer(&output);
if (is_bdr_db(conn, &output) == false)
{
status = CHECK_STATUS_CRITICAL;
appendPQExpBuffer(&details,
"%s", output.data);
}
termPQExpBuffer(&output);
if (status == CHECK_STATUS_OK)
{
if (is_active_bdr_node(conn, node_info->node_name) == false)
{
status = CHECK_STATUS_CRITICAL;
appendPQExpBuffer(&details,
_("node is not an active BDR node"));
}
else
{
appendPQExpBuffer(&details,
_("node is an active BDR node"));
}
}
}
default:
break;
}
switch (mode)
{
case OM_NAGIOS:
printf("REPMGR_SERVER_ROLE %s: %s\n",
output_check_status(status),
details.data);
break;
case OM_TEXT:
if (list_output != NULL)
{
check_status_list_set(list_output,
"Server role",
status,
details.data);
}
else
{
printf("%s (%s)\n",
output_check_status(status),
details.data);
}
default:
break;
}
termPQExpBuffer(&details);
return status;
}
static CheckStatus
do_node_check_slots(PGconn *conn, OutputMode mode, t_node_info *node_info, CheckStatusList *list_output)
{
CheckStatus status = CHECK_STATUS_OK;
PQExpBufferData details;
initPQExpBuffer(&details);
if (server_version_num < 90400)
{
appendPQExpBuffer(&details,
_("replication slots not available for this PostgreSQL version"));
}
else if (node_info->total_replication_slots == 0)
{
appendPQExpBuffer(&details,
_("node has no replication slots"));
}
else if (node_info->inactive_replication_slots == 0)
{
appendPQExpBuffer(&details,
_("%i of %i replication slots are active"),
node_info->total_replication_slots,
node_info->total_replication_slots);
}
else if (node_info->inactive_replication_slots > 0)
{
status = CHECK_STATUS_CRITICAL;
appendPQExpBuffer(&details,
_("%i of %i replication slots are inactive"),
node_info->inactive_replication_slots,
node_info->total_replication_slots);
}
switch (mode)
{
case OM_NAGIOS:
printf("REPMGR_INACTIVE_SLOTS %s: %s | slots=%i;%i\n",
output_check_status(status),
details.data,
node_info->total_replication_slots,
node_info->inactive_replication_slots);
break;
case OM_TEXT:
if (list_output != NULL)
{
check_status_list_set(list_output,
"Replication slots",
status,
details.data);
}
else
{
printf("%s (%s)\n",
output_check_status(status),
details.data);
}
default:
break;
}
termPQExpBuffer(&details);
return status;
}
static void
do_node_check_replication_connection(void)
{
PGconn *local_conn = NULL;
PGconn *repl_conn = NULL;
t_node_info node_record = T_NODE_INFO_INITIALIZER;
RecordStatus record_status = RECORD_NOT_FOUND;
t_conninfo_param_list remote_conninfo;
PQExpBufferData output;
initPQExpBuffer(&output);
appendPQExpBuffer(&output,
"--connection=");
if (runtime_options.remote_node_id == UNKNOWN_NODE_ID)
{
appendPQExpBuffer(&output, "UNKNOWN");
printf("%s\n", output.data);
termPQExpBuffer(&output);
return;
}
local_conn = establish_db_connection(config_file_options.conninfo, true);
record_status = get_node_record(local_conn, runtime_options.remote_node_id, &node_record);
PQfinish(local_conn);
if (record_status != RECORD_FOUND)
{
appendPQExpBuffer(&output, "UNKNOWN");
printf("%s\n", output.data);
termPQExpBuffer(&output);
return;
}
initialize_conninfo_params(&remote_conninfo, false);
parse_conninfo_string(node_record.conninfo, &remote_conninfo, NULL, false);
param_set(&remote_conninfo, "replication", "1");
param_set(&remote_conninfo, "user", node_record.repluser);
repl_conn = establish_db_connection_by_params(&remote_conninfo, false);
if (PQstatus(repl_conn) != CONNECTION_OK)
{
appendPQExpBuffer(&output, "BAD");
printf("%s\n", output.data);
termPQExpBuffer(&output);
return;
}
PQfinish(repl_conn);
appendPQExpBuffer(&output, "OK");
printf("%s\n", output.data);
termPQExpBuffer(&output);
return;
}
static CheckStatus
do_node_check_archive_ready(PGconn *conn, OutputMode mode, CheckStatusList *list_output)
{
int ready_archive_files = 0;
CheckStatus status = CHECK_STATUS_UNKNOWN;
PQExpBufferData details;
if (mode == OM_CSV)
{
log_error(_("--csv output not provided with --archive-ready option"));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
initPQExpBuffer(&details);
ready_archive_files = get_ready_archive_files(conn, config_file_options.data_directory);
if (ready_archive_files > config_file_options.archive_ready_critical)
{