bn8/check_pg_streaming_replication
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Fix taking care of synchronous_commit master configuration and removed useless -C parameter and its check

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This commit is contained in:
Benjamin Renard 2024-07-17 10:56:43 +02:00
parent bc078f83e8
commit e5514e587f
Signed by: bn8
GPG key ID: 3E2E1CE1907115BC
2 changed files with 73 additions and 48 deletions
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39
README.md
View file

@ -60,27 +60,34 @@ ln -s /usr/local/src/check_pg_streaming_replication/check_pg_streaming_replicati
```
Usage: ./check_pg_streaming_replication [-d] [-h] [options]
-u pg_user Specify local Postgres user (Default: try to auto-detect or use postgres)
-u pg_user Specify local Postgres user (Default: try to auto-detect or
use postgres)
-b psql_bin Specify psql binary path (Default: /usr/bin/psql)
-B pg_lsclusters_bin Specify pg_lsclusters binary path (Default: /usr/bin/pg_lsclusters)
-V pg_version Specify Postgres version (Default: try to auto-detect or use 9.1)
-m pg_main Specify Postgres main directory path (Default: try to auto-detect or use
/var/lib/postgresql//main)
-V pg_version Specify Postgres version (Default: try to auto-detect or
use 9.1)
-m pg_main Specify Postgres main directory path (Default: try to auto-detect or
use /var/lib/postgresql//main)
-r recovery_conf Specify Postgres recovery configuration file path
( Default: [PG_MAIN]/recovery.conf on PG <= 11, [PG_MAIN]/postgresql.auto.conf on PG >= 12)
-U pg_master_user Specify Postgres user to use on master (Default: user from recovery.conf file)
-p pg_port Specify default Postgres master TCP port (Default: same as local PostgreSQL
port if detected or use 5432)
-D dbname Specify DB name on Postgres master/slave to connect on (Default: PG_USER, must
match with .pgpass one is used)
-C 1/0 Enable or disable check if the current LSN of the master host is the same
of the last received LSN (Default: 1)
-w replay_warn_delay Specify the replay warning delay in second (Default: 3)
-c replay_crit_delay Specify the replay critical delay in second (Default: 5)
-e expected_sync_state The expected replication state ('sync' or 'async', default: sync)
-E expected_mode The expected mode ('master', 'hot-standby' or 'auto', default: 'auto')
(Default: [PG_MAIN]/recovery.conf on PG <= 11,
[PG_MAIN]/postgresql.auto.conf on PG >= 12)
-U pg_master_user Specify Postgres user to use on master (Default: user from recovery.conf
file)
-p pg_port Specify default Postgres master TCP port (Default: same as local
PostgreSQL port if detected or use 5432)
-D dbname Specify DB name on Postgres master/slave to connect on (Default:
PG_USER, must match with .pgpass one is used)
-w replay_warn_delay Specify the replay warning delay in second
(Default: 3)
-c replay_crit_delay Specify the replay critical delay in second
(Default: 5)
-e expected_sync_state The expected replication state ('sync' or 'async',
default: sync)
-E expected_mode The expected mode ('master', 'hot-standby' or 'auto',
default: 'auto')
-d Debug mode
-h Show this message
```
## Copyright

82
check_pg_streaming_replication
View file

@ -20,7 +20,7 @@
# ~/.pgpass).
#
# Author: Benjamin Renard <brenard@easter-eggs.com>
# Date: Mon, 03 Jun 2024 15:31:29 +0200
# Date: Wed Jul 17 10:56:43 2024 +0200
# Source: https://gitea.zionetrix.net/bn8/check_pg_streaming_replication
# SPDX-License-Identifier: GPL-3.0-or-later
#
@ -39,7 +39,6 @@ RECOVERY_CONF=""
PG_DEFAULT_PORT=""
PG_DEFAULT_APP_NAME=$( hostname )
PG_DB=""
CHECK_CUR_MASTER_LSN=1
REPLAY_WARNING_DELAY=3
REPLAY_CRITICAL_DELAY=5
EXPECTED_SYNC_STATE=sync
@ -69,8 +68,6 @@ Usage: $0 [-d] [-h] [options]
PostgreSQL port if detected or use $DEFAULT_PG_PORT)
-D dbname Specify DB name on Postgres master/slave to connect on (Default:
PG_USER, must match with .pgpass one is used)
-C 1/0 Enable or disable check if the current LSN of the master host is the
same of the last received LSN (Default: $CHECK_CUR_MASTER_LSN)
-w replay_warn_delay Specify the replay warning delay in second
(Default: $REPLAY_WARNING_DELAY)
-c replay_crit_delay Specify the replay critical delay in second
@ -85,7 +82,7 @@ EOF
[[ -n "$ERROR" ]] && exit 1 || exit 0
}
while getopts "hu:b:B:V:m:r:U:p:D:C:w:c:e:E:d" OPTION; do
while getopts "hu:b:B:V:m:r:U:p:D:w:c:e:E:d" OPTION; do
case $OPTION in
u)
PG_USER=$OPTARG
@ -114,9 +111,6 @@ while getopts "hu:b:B:V:m:r:U:p:D:C:w:c:e:E:d" OPTION; do
D)
PG_DB=$OPTARG
;;
C)
CHECK_CUR_MASTER_LSN=$OPTARG
;;
w)
REPLAY_WARNING_DELAY=$OPTARG
;;
@ -164,7 +158,6 @@ PG_MAIN = $PG_MAIN
RECOVERY_CONF = $RECOVERY_CONF
PG_DEFAULT_PORT = $PG_DEFAULT_PORT
PG_DEFAULT_APP_NAME = $PG_DEFAULT_APP_NAME
CHECK_CUR_MASTER_LSN = $CHECK_CUR_MASTER_LSN
REPLAY_WARNING_DELAY = $REPLAY_WARNING_DELAY
REPLAY_CRITICAL_DELAY = $REPLAY_CRITICAL_DELAY
EXPECTED_SYNC_STATE = $EXPECTED_SYNC_STATE
@ -250,7 +243,6 @@ PG_MAIN = $PG_MAIN
RECOVERY_CONF = $RECOVERY_CONF
PG_DEFAULT_PORT = $PG_DEFAULT_PORT
PG_DEFAULT_APP_NAME = $PG_DEFAULT_APP_NAME
CHECK_CUR_MASTER_LSN = $CHECK_CUR_MASTER_LSN
REPLAY_WARNING_DELAY = $REPLAY_WARNING_DELAY
REPLAY_CRITICAL_DELAY = $REPLAY_CRITICAL_DELAY
"
@ -386,6 +378,19 @@ if [[ "$EXPECTED_MODE" == "hot-standby" ]]; then
debug "Master application name: $M_APP_NAME"
fi
# Check if master is configured for synchronous commit
SYNC_MODE="$(
psql_master_get "SELECT setting from pg_settings WHERE name = 'synchronous_commit';"
)"
debug "Master synchronous_commit=$SYNC_MODE"
if [[ "$SYNC_MODE" == "on" ]] || [[ "$SYNC_MODE" == "remote_apply" ]]; then
debug "Master is configured for synchronous commit"
SYNCHRONOUS_COMMIT=1
else
debug "Master is not configured for synchronous commit"
SYNCHRONOUS_COMMIT=0
fi
# Get current replication state information from master
M_CUR_REPL_STATE_INFO="$(
psql_master_get \
@ -419,24 +424,6 @@ if [[ "$EXPECTED_MODE" == "hot-standby" ]]; then
M_CUR_WRITED_LSN=$( cut -d'|' -f4 <<< "$M_CUR_REPL_STATE_INFO" )
debug "Master current last sent/writed LSN: '$M_CUR_SENT_LSN' / '$M_CUR_WRITED_LSN'"
# Check current master LSN vs last received LSN
if [[ "$CHECK_CUR_MASTER_LSN" == "1" ]]; then
# Get current LSN from master
M_CUR_LSN="$( psql_master_get "SELECT $pg_current_wal_lsn" )"
if [[ -z "$M_CUR_LSN" ]]; then
echo "UNKNOWN: Can't retrieve current LSN from master server"
exit 3
fi
debug "Master current LSN: $M_CUR_LSN"
# Master current LSN is the last received LSN ?
if [[ "$M_CUR_LSN" != "$LAST_RECEIVED_LSN" ]]; then
echo "CRITICAL: Master current LSN is not the last received LSN"
exit 2
fi
debug "Master current LSN is the last received LSN"
fi
# The last received LSN is the last replayed ?
if [[ "$LAST_RECEIVED_LSN" != "$LAST_REPLAYED_LSN" ]]; then
debug "/!\ The last received LSN is NOT the last replayed LSN" \
@ -462,11 +449,27 @@ if [[ "$EXPECTED_MODE" == "hot-standby" ]]; then
debug "Last received LSN is the last replayed file"
# The master last sent LSN is the last received (and synced) ?
if [[ "$M_CUR_SENT_LSN" != "$LAST_RECEIVED_LSN" ]]; then
echo "WARNING: master last sent LSN is not already received (and synced to disk) by slave."
echo "May be we have some network delay or load on slave"
if [[ $SYNCHRONOUS_COMMIT -eq 1 ]] && [[ "$M_CUR_SENT_LSN" != "$LAST_RECEIVED_LSN" ]]; then
LSN_DIFF=$(
psql_master_get "SELECT $pg_wal_lsn_diff('$M_CUR_SENT_LSN', '$LAST_RECEIVED_LSN');"
)
debug "LSN diff ('$M_CUR_SENT_LSN' vs '$LAST_RECEIVED_LSN'): $LSN_DIFF bytes"
echo "WARNING: master last sent LSN is not already received (and synced to disk) by slave" \
"(diff: $LSN_DIFF bytes). May be we have some network delay or load on slave"
echo "Master last sent LSN: $M_CUR_SENT_LSN"
echo "Slave last received (and synced to disk) LSN: $LAST_RECEIVED_LSN"
echo "Diff: $LSN_DIFF bytes"
exit 1
elif [[ $SYNCHRONOUS_COMMIT -eq 0 ]] && [ "$M_CUR_SENT_LSN" != "$M_CUR_WRITED_LSN" ];then
LSN_DIFF=$(
psql_master_get "SELECT pg_wal_lsn_diff('$M_CUR_SENT_LSN', '$M_CUR_WRITED_LSN');"
)
debug "LSN diff ('$M_CUR_SENT_LSN' vs '$M_CUR_WRITED_LSN'): $LSN_DIFF bytes"
echo "WARNING: master last sent LSN is not already received by slave " \
"(diff: $LSN_DIFF bytes). May be we have some network delay or load on slave"
echo "Master last sent LSN: $M_CUR_SENT_LSN"
echo "Slave last received LSN: $M_CUR_WRITED_LSN"
echo "Diff: $LSN_DIFF bytes"
exit 1
fi
@ -491,6 +494,17 @@ elif [[ "$EXPECTED_MODE" == "master" ]]; then
fi
debug "Current LSN: $CURRENT_LSN"
# Check if master is configured for synchronous commit
SYNC_MODE="$( psql_get "SELECT setting from pg_settings WHERE name = 'synchronous_commit';" )"
debug "synchronous_commit=$SYNC_MODE"
if [[ "$SYNC_MODE" == "on" ]] || [[ "$SYNC_MODE" == "remote_apply" ]]; then
debug "Master is configured for synchronous commit"
SYNCHRONOUS_COMMIT=1
else
debug "Master is not configured for synchronous commit"
SYNCHRONOUS_COMMIT=0
fi
# Check standby client
STANDBY_CLIENTS=$(
psql_get \
@ -528,7 +542,11 @@ elif [[ "$EXPECTED_MODE" == "master" ]]; then
STANDBY_CLIENTS_ROW="$NAME ($IP): $STATE/$SYNC_STATE"
STANDBY_CLIENTS_ROW+=" (LSN: sent='$SENT_LSN' / writed='$WRITED_LSN', Lag: ${LAG}b"
STANDBY_CLIENTS_ROWS+=( "$STANDBY_CLIENTS_ROW" )
[[ "$SENT_LSN" != "$CURRENT_LSN" ]] && CURRENT_LSN_IS_LAST_SENT=0
if [[ $SYNCHRONOUS_COMMIT -eq 1 ]] && [[ "$SENT_LSN" != "$CURRENT_LSN" ]]; then
CURRENT_LSN_IS_LAST_SENT=0
elif [[ $SYNCHRONOUS_COMMIT -eq 0 ]] && [[ "$SENT_LSN" != "$WRITED_LSN" ]]; then
CURRENT_LSN_IS_LAST_SENT=0
fi
done
if [[ $CURRENT_LSN_IS_LAST_SENT -eq 1 ]]; then