353 lines
11 KiB
Bash
Executable file
353 lines
11 KiB
Bash
Executable file
#!/bin/bash
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#
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# Nagios plugin to check Postgresql streamin replication state
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#
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# Could be use on Master or on standby node
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#
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# Requirement :
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#
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# On master node : Slaves must be able to connect with user from recovery.conf
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# to database with the same name (or another specified with -D)
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# as trust (or via md5 using password specified in ~/.pgpass).
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#
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# On standby node : PG_USER must be able to connect localy on the database
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# with the same name (or another specified with -D) as trust
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# (or via md5 using password specified in ~/.pgpass).
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#
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# Author : Benjamin Renard <brenard@easter-eggs.com>
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# Date : Fri, 25 Aug 2017 15:57:57 +0200
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# Source : http://git.zionetrix.net/check_pg_streaming_replication
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#
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PG_USER=postgres
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PG_MASTER_USER=""
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PSQL_BIN=/usr/bin/psql
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PG_MAIN=/var/lib/postgresql/9.1/main
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if [ -f /etc/debian_version ]
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then
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AUTO_PG_MAIN=$( ls -1d /var/lib/postgresql/9*/main 2> /dev/null|sort -n|tail -n 1 )
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[ -n "$AUTO_PG_MAIN" -a -d "$AUTO_PG_MAIN" ] && PG_MAIN=$AUTO_PG_MAIN
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elif [ -f /etc/redhat-release ]
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then
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AUTO_PG_MAIN=$( ls -1d /var/lib/pgsql/9*/data 2> /dev/null|sort -n|tail -n 1 )
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[ -n "$AUTO_PG_MAIN" -a -d "$AUTO_PG_MAIN" ] && PG_MAIN=$AUTO_PG_MAIN
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fi
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RECOVERY_CONF_FILENAME=recovery.conf
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RECOVERY_CONF=""
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PG_DEFAULT_PORT=5432
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PG_DEFAULT_APP_NAME=$( hostname )
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PG_DB=""
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CHECK_CUR_MASTER_XLOG=1
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REPLAY_WARNING_DELAY=3
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REPLAY_CRITICAL_DELAY=5
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DEBUG=0
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function usage () {
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cat << EOF
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Usage : $0 [-d] [-h] [options]
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-u pg_user Specify Postgres user (Default : $PG_USER)
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-b psql_bin Specify psql binary path (Default : $PSQL_BIN)
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-m pg_main Specify Postgres main directory path
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(By default, try to auto-detect it, on your system it :
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$PG_MAIN)
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-r recovery_conf Specify Postgres recovery configuration file path
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(Default : [PG_MAIN]/$RECOVERY_CONF_FILENAME)
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-U pg_master_user Specify Postgres user to use on master (Default : user from recovery.conf file)
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-p pg_port Specify default Postgres master TCP port (Default : $PG_DEFAULT_PORT)
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-D dbname Specify DB name on Postgres master/slave to connect on (Default : PG_USER)
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-C 1/0 Enable or disable check if the current XLOG file of the master host is the same
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of the last replay XLOG file (Default : $CHECK_CUR_MASTER_XLOG)
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-w replay_warn_delay Specify the replay warning delay in second (Default : $REPLAY_WARNING_DELAY)
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-c replay_crit_delay Specify the replay critical delay in second (Default : $REPLAY_CRITICAL_DELAY)
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-d Debug mode
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-h Show this message
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EOF
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exit 0
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}
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while getopts "hu:b:m:r:U:p:D:C:w:c:d" OPTION
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do
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case $OPTION in
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u)
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PG_USER=$OPTARG
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;;
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b)
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PSQL_BIN=$OPTARG
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;;
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m)
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PG_MAIN=$OPTARG
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;;
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r)
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RECOVERY_CONF=$OPTARG
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;;
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U)
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PG_MASTER_USER=$OPTARG
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;;
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p)
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PG_DEFAULT_PORT=$OPTARG
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;;
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D)
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PG_DB=$OPTARG
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;;
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C)
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CHECK_CUR_MASTER_XLOG=$OPTARG
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;;
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w)
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REPLAY_WARNING_DELAY=$OPTARG
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;;
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c)
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REPLAY_CRITICAL_DELAY=$OPTARG
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;;
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d)
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DEBUG=1
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;;
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h)
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usage
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;;
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\?)
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echo -n "Unkown option"
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usage
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esac
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done
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# Check PG_USER
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[ -z "$PG_USER" ] && echo "UNKNOWN : Postgres user not specified" && exit 3
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id "$PG_USER" > /dev/null 2>&1
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[ $? -ne 0 ] && echo "UNKNOWN : Invalid Postgres user ($PG_USER)" && exit 3
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# Check PSQL_BIN
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[ ! -x "$PSQL_BIN" ] && echo "UNKNOWN : Invalid psql bin path ($PSQL_BIN)" && exit 3
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# Check PG_MAIN
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[ ! -d "$PG_MAIN/" ] && echo "UNKNOWN : Invalid Postgres main directory path ($PG_MAIN)" && exit 3
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# Check RECOVERY_CONF
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[ -z "$RECOVERY_CONF" ] && RECOVERY_CONF="$PG_MAIN/$RECOVERY_CONF_FILENAME"
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# Check PG_DEFAULT_PORT
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[ $( echo "$PG_DEFAULT_PORT"|grep -c -E '^[0-9]*$' ) -ne 1 ] && "UNKNOWN : Postgres default master TCP port must be an integer." && exit 3
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# If PG_DB is not provided with -D parameter, use PG_USER as default value
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[ -z "$PG_DB" ] && PG_DB="$PG_USER"
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function psql_get () {
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sql="$1"
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debug "Exec 'echo \"$sql\"|sudo -u $PG_USER $PSQL_BIN -d \"$PG_DB\" -w -t -P format=unaligned"
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echo "$sql"|sudo -u $PG_USER $PSQL_BIN -d "$PG_DB" -w -t -P format=unaligned
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}
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function psql_master_get () {
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sql="$1"
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debug "Exec 'echo \"$sql\"|sudo -u $PG_USER $PSQL_BIN -U $M_USER -h $M_HOST -w -p $M_PORT -d $PG_DB -t -P format=unaligned"
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echo "$sql"|sudo -u $PG_USER $PSQL_BIN -U $M_USER -h $M_HOST -w -p $M_PORT -d $PG_DB -t -P format=unaligned
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}
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function debug() {
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if [ $DEBUG -eq 1 ]
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then
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>&2 echo "[DEBUG] $1"
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fi
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}
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debug "Running options :
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PG_DB = $PG_DB
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PG_USER = $PG_USER
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PSQL_BIN = $PSQL_BIN
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PG_MAIN = $PG_MAIN
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RECOVERY_CONF = $RECOVERY_CONF
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PG_DEFAULT_PORT = $PG_DEFAULT_PORT
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PG_DEFAULT_APP_NAME = $PG_DEFAULT_APP_NAME
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CHECK_CUR_MASTER_XLOG = $CHECK_CUR_MASTER_XLOG
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REPLAY_WARNING_DELAY = $REPLAY_WARNING_DELAY
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REPLAY_CRITICAL_DELAY = $REPLAY_CRITICAL_DELAY
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"
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# Postgres is running ?
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if [ $DEBUG -eq 0 ]
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then
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psql_get '\q' 2> /dev/null
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else
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psql_get '\q'
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fi
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if [ $? -ne 0 ]
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then
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echo "CRITICAL : Postgres is not running !"
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exit 2
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fi
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debug "Postgres is running"
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RECOVERY_MODE=0
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[ "$( psql_get 'SELECT pg_is_in_recovery();' )" == "t" ] && RECOVERY_MODE=1
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if [ -f $RECOVERY_CONF ]
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then
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debug "File recovery.conf found. Hot-standby mode."
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# Check recovery mode
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if [ $RECOVERY_MODE -ne 1 ]
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then
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echo "CRITICAL : Not in recovery mode while recovery.conf file found !"
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exit 2
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fi
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debug "Postgres is in recovery mode"
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LAST_XLOG_RECEIVE=$( psql_get "SELECT pg_last_xlog_receive_location()" )
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debug "Last xlog file receive : $LAST_XLOG_RECEIVE"
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LAST_XLOG_REPLAY=$( psql_get "SELECT pg_last_xlog_replay_location()" )
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debug "Last xlog file replay : $LAST_XLOG_REPLAY"
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# Get master connection informations from recovery.conf file
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MASTER_CONN_INFOS=$( egrep '^ *primary_conninfo' $RECOVERY_CONF|sed "s/^ *primary_conninfo *= *\(.\+\) *$/\1/" )
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if [ ! -n "$MASTER_CONN_INFOS" ]
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then
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echo "UNKNOWN : Can't retreive master connection informations form recovery.conf file"
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exit 3
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fi
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debug "Master connection informations : $MASTER_CONN_INFOS"
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M_HOST=$( echo "$MASTER_CONN_INFOS"| grep 'host=' | sed 's/^.*host= *\([0-9a-zA-Z.-]\+\) *.*$/\1/' )
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if [ ! -n "$M_HOST" ]
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then
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echo "UNKNOWN : Can't retreive master host from recovery.conf file"
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exit 3
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fi
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debug "Master host : $M_HOST"
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M_PORT=$( echo "$MASTER_CONN_INFOS"| grep 'port=' | sed 's/^.*port= *\([0-9a-zA-Z.-]\+\) *.*$/\1/' )
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if [ ! -n "$M_PORT" ]
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then
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debug "Master port not specified, use default : $PG_DEFAULT_PORT"
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M_PORT=$PG_DEFAULT_PORT
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else
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debug "Master port : $M_PORT"
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fi
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if [ -n "$PG_MASTER_USER" ]
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then
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debug "Master user provided by command-line, use it : $PG_MASTER_USER"
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M_USER="$PG_MASTER_USER"
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else
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M_USER=$( echo "$MASTER_CONN_INFOS"| grep 'user=' | sed 's/^.*user= *\([0-9a-zA-Z.-]\+\) *.*$/\1/' )
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if [ ! -n "$M_USER" ]
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then
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debug "Master user not specified, use default : $PG_USER"
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M_USER=$PG_USER
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else
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debug "Master user : $M_USER"
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fi
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fi
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M_APP_NAME=$( echo "$MASTER_CONN_INFOS"| grep 'application_name=' | sed "s/^.*application_name=[ \'\"]*\([^ \'\"]\+\)[ \'\"]*.*$/\1/" )
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if [ ! -n "$M_APP_NAME" ]
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then
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debug "Master application name not specified, use default : $PG_DEFAULT_APP_NAME"
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M_APP_NAME=$PG_DEFAULT_APP_NAME
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else
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debug "Master application name : $M_APP_NAME"
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fi
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# Get current state/sync_state from master
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M_CUR_STATE_SYNC_STATE="$( psql_master_get "SELECT state,sync_state FROM pg_stat_replication WHERE application_name='$M_APP_NAME';" )"
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if [ ! -n "$M_CUR_STATE_SYNC_STATE" ]
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then
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echo "UNKNOWN : Can't retreive current state and sync state from master server"
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exit 3
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fi
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debug "Master current state / sync_state : $M_CUR_STATE_SYNC_STATE"
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M_CUR_STATE=$( echo "$M_CUR_STATE_SYNC_STATE"|cut -d'|' -f1 )
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debug "Master current state : $M_CUR_STATE"
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if [ "$M_CUR_STATE" != "streaming" ]
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then
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echo "CRITICAL : this host is not in streaming state according to master host (current state = '$M_CUR_STATE')"
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exit 2
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fi
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M_CUR_SYNC_STATE=$( echo "$M_CUR_STATE_SYNC_STATE"|cut -d'|' -f2 )
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debug "Master current sync state : $M_CUR_SYNC_STATE"
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if [ "$M_CUR_SYNC_STATE" != "sync" ]
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then
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echo "CRITICAL : this host is not synchronized according to master host (current sync state = '$M_CUR_SYNC_STATE')"
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exit 2
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fi
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# Check current master XLOG file vs last replay XLOG file
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if [ "$CHECK_CUR_MASTER_XLOG" == "1" ]
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then
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# Get current xlog file from master
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M_CUR_XLOG="$( psql_master_get 'SELECT pg_current_xlog_location()' )"
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if [ ! -n "$M_CUR_XLOG" ]
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then
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echo "UNKNOWN : Can't retreive current xlog from master server"
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exit 3
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fi
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debug "Master current xlog : $M_CUR_XLOG"
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# Master current xlog is the last receive xlog ?
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if [ "$M_CUR_XLOG" != "$LAST_XLOG_RECEIVE" ]
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then
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echo "CRITICAL : Master current xlog is not the last receive xlog"
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exit 2
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fi
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debug "Master current xlog is the last receive xlog"
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fi
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# The last receive xlog is the last replay file ?
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if [ "$LAST_XLOG_RECEIVE" != "$LAST_XLOG_REPLAY" ]
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then
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debug "/!\ The last receive xlog is NOT the last replay file ('$M_CUR_XLOG' / '$LAST_XLOG_RECEIVE')"
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REPLAY_DELAY="$( psql_get 'SELECT EXTRACT(EPOCH FROM now() - pg_last_xact_replay_timestamp());' )"
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debug "Replay delay is $REPLAY_DELAY second(s)"
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if [ $( echo "$REPLAY_DELAY >= $REPLAY_CRITICAL_DELAY"|bc -l ) -gt 0 ]
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then
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echo "CRITICAL : last receive xlog file is not the last replay file ('$LAST_XLOG_RECEIVE' / '$LAST_XLOG_REPLAY') and replay delay is $REPLAY_DELAY second(s)"
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exit 2
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fi
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if [ $( echo "$REPLAY_DELAY >= $REPLAY_WARNING_DELAY"|bc -l ) -gt 0 ]
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then
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echo "WARNING : last receive xlog file is not the last replay file ('$LAST_XLOG_RECEIVE' / '$LAST_XLOG_REPLAY') and replay delay is $REPLAY_DELAY second(s)"
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exit 1
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fi
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debug "Replay delay is not worrying"
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fi
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debug "Last receive xlog file is the last replay file"
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echo "OK : Hot-standby server is uptodate"
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exit 0
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else
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debug "File recovery.conf not found. Master mode."
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# Check recovery mode
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if [ $RECOVERY_MODE -eq 1 ]
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then
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echo "CRITICAL : In recovery mode while recovery.conf file not found !"
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exit 2
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fi
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debug "Postgres is not in recovery mode"
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# Check standby client
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STANDBY_CLIENTS=$( psql_get "SELECT client_addr, sync_state FROM pg_stat_replication;" )
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if [ ! -n "$STANDBY_CLIENTS" ]
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then
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echo "WARNING : no stand-by client connected"
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exit 1
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fi
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debug "Stand-by client(s) : $( echo -n $STANDBY_CLIENTS|sed 's/\n/ , /g' )"
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STANDBY_CLIENTS_TXT=""
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STANDBY_CLIENTS_COUNT=0
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for line in $STANDBY_CLIENTS
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do
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let STANDBY_CLIENTS_COUNT=STANDBY_CLIENTS_COUNT+1
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IP=$( echo $line|cut -d '|' -f 1 )
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MODE=$( echo $line|cut -d '|' -f 2 )
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STANDBY_CLIENTS_TXT="$STANDBY_CLIENTS_TXT $IP (mode=$MODE)"
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done
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echo "OK : $STANDBY_CLIENTS_COUNT stand-by client(s) connected - $STANDBY_CLIENTS_TXT"
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exit 0
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fi
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