#!/bin/bash ######################################################################### # Script: check_mysql_slavestatus.sh # # Author: Claudio Kuenzler www.claudiokuenzler.com # # Purpose: Monitor MySQL Replication status with Nagios # # Description: Connects to given MySQL hosts and checks for running # # SLAVE state and delivers additional info # # Original: This script is a modified version of # # check mysql slave sql running written by dhirajt # # Thanks to: Victor Balada Diaz for his ideas added on 20080930 # # Soren Klintrup for stuff added on 20081015 # # Marc Feret for Slave_IO_Running check 20111227 # # Peter Lecki for his mods added on 20120803 # # Serge Victor for his mods added on 20131223 # # Omri Bahumi for his fix added on 20131230 # # Marc Falzon for his option mods added on 20190822 # # Andreas Pfeiffer for adding socket option on 20190822 # # History: # # 2008041700 Original Script modified # # 2008041701 Added additional info if status OK # # 2008041702 Added usage of script with params -H -u -p # # 2008041703 Added bindir variable for multiple platforms # # 2008041704 Added help because mankind needs help # # 2008093000 Using /bin/sh instead of /bin/bash # # 2008093001 Added port for MySQL server # # 2008093002 Added mysqldir if mysql binary is elsewhere # # 2008101501 Changed bindir/mysqldir to use PATH # # 2008101501 Use $() instead of `` to avoid forks # # 2008101501 Use ${} for variables to prevent problems # # 2008101501 Check if required commands exist # # 2008101501 Check if mysql connection works # # 2008101501 Exit with unknown status at script end # # 2008101501 Also display help if no option is given # # 2008101501 Add warning/critical check to delay # # 2011062200 Add perfdata # # 2011122700 Checking Slave_IO_Running # # 2012080300 Changed to use only one mysql query # # 2012080301 Added warn and crit delay as optional args # # 2012080302 Added standard -h option for syntax help # # 2012080303 Added check for mandatory options passed in # # 2012080304 Added error output from mysql # # 2012080305 Changed from 'cut' to 'awk' (eliminate ws) # # 2012111600 Do not show password in error output # # 2013042800 Changed PATH to use existing PATH, too # # 2013050800 Bugfix in PATH export # # 2013092700 Bugfix in PATH export # # 2013092701 Bugfix in getopts # # 2013101600 Rewrite of threshold logic and handling # # 2013101601 Optical clean up # # 2013101602 Rewrite help output # # 2013101700 Handle Slave IO in 'Connecting' state # # 2013101701 Minor changes in output, handling UNKWNON situations now # # 2013101702 Exit CRITICAL when Slave IO in Connecting state # # 2013123000 Slave_SQL_Running also matched Slave_SQL_Running_State # # 2015011600 Added 'moving' check to catch possible connection issues # # 2015011900 Use its own threshold for replication moving check # # 2019082200 Add support for mysql option file # # 2019082201 Improve password security (remove from mysql cli) # # 2019082202 Added socket parameter (-S) # # 2019082203 Use default port 3306, makes -P optional # # 2019082204 Fix moving subcheck, improve documentation # ######################################################################### # Usage: ./check_mysql_slavestatus.sh (-o file|(-H dbhost [-P port]|-S socket) -u dbuser -p dbpass) [-s connection] [-w integer] [-c integer] [-m integer] ######################################################################### help="\ncheck_mysql_slavestatus.sh (c) 2008-2019 GNU GPLv2 licence Usage: $0 (-o file|(-H dbhost [-P port]|-S socket) -u username -p password) [-s connection] [-w integer] [-c integer] [-m]\n Options:\n-o Path to option file containing connection settings (e.g. /home/nagios/.my.cnf). Note: If this option is used, -H, -u, -p parameters will become optional\n-H Hostname or IP of slave server\n-P MySQL Port of slave server (optional, defaults to 3306)\n-u Username of DB-user\n-p Password of DB-user\n-S database socket\n-s Connection name (optional, with multi-source replication)\n-w Replication delay in seconds for Warning status (optional)\n-c Replication delay in seconds for Critical status (optional)\n-m Threshold in seconds since when replication did not move (compares the slaves log position)\n Attention: The DB-user you type in must have CLIENT REPLICATION rights on the DB-server. Example:\n\tGRANT REPLICATION CLIENT on *.* TO 'nagios'@'%' IDENTIFIED BY 'secret';" STATE_OK=0 # define the exit code if status is OK STATE_WARNING=1 # define the exit code if status is Warning (not really used) STATE_CRITICAL=2 # define the exit code if status is Critical STATE_UNKNOWN=3 # define the exit code if status is Unknown export PATH=$PATH:/usr/local/bin:/usr/bin:/bin # Set path crit="No" # what is the answer of MySQL Slave_SQL_Running for a Critical status? ok="Yes" # what is the answer of MySQL Slave_SQL_Running for an OK status? port="-P 3306" # on which tcp port is the target MySQL slave listening? for cmd in mysql awk grep expr [ do if ! `which ${cmd} &>/dev/null` then echo "UNKNOWN: This script requires the command '${cmd}' but it does not exist; please check if command exists and PATH is correct" exit ${STATE_UNKNOWN} fi done # Check for people who need help ######################################################################### if [ "${1}" = "--help" -o "${#}" = "0" ]; then echo -e "${help}"; exit 1; fi # Important given variables for the DB-Connect ######################################################################### while getopts "H:P:u:p:S:s:w:c:o:m:h" Input; do case ${Input} in H) host="-h ${OPTARG}";slavetarget=${OPTARG};; P) port="-P ${OPTARG}";; u) user="-u ${OPTARG}";; p) password="${OPTARG}"; export MYSQL_PWD="${OPTARG}";; S) socket="-S ${OPTARG}";; s) connection=\"${OPTARG}\";; w) warn_delay=${OPTARG};; c) crit_delay=${OPTARG};; o) optfile="--defaults-extra-file=${OPTARG}";; m) moving=${OPTARG};; h) echo -e "${help}"; exit 1;; \?) echo "Wrong option given. Check help (-h, --help) for usage." exit 1 ;; esac done # Check if we can write to tmp ######################################################################### test -w /tmp && tmpfile="/tmp/mysql_slave_${slavetarget}_pos.txt" # Connect to the DB server and check for informations ######################################################################### # Check whether all required arguments were passed in (either option file or full connection settings) if [[ -z "${optfile}" && -z "${host}" && -z "${socket}" ]]; then echo -e "Missing required parameter(s)"; exit ${STATE_UNKNOWN} elif [[ -n "${host}" && (-z "${user}" || -z "${password}") ]]; then echo -e "Missing required parameter(s)"; exit ${STATE_UNKNOWN} elif [[ -n "${socket}" && (-z "${user}" || -z "${password}") ]]; then echo -e "Missing required parameter(s)"; exit ${STATE_UNKNOWN} fi # Connect to the DB server and store output in vars if [[ -n $socket ]]; then ConnectionResult=$(mysql ${optfile} ${socket} ${user} -e "show slave ${connection} status\G" 2>&1) else ConnectionResult=$(mysql ${optfile} ${host} ${port} ${user} -e "show slave ${connection} status\G" 2>&1) fi if [ -z "`echo "${ConnectionResult}" |grep Slave_IO_State`" ]; then echo -e "CRITICAL: Unable to connect to server" exit ${STATE_CRITICAL} fi check=`echo "${ConnectionResult}" |grep Slave_SQL_Running: | awk '{print $2}'` checkio=`echo "${ConnectionResult}" |grep Slave_IO_Running: | awk '{print $2}'` masterinfo=`echo "${ConnectionResult}" |grep Master_Host: | awk '{print $2}'` delayinfo=`echo "${ConnectionResult}" |grep Seconds_Behind_Master: | awk '{print $2}'` readpos=`echo "${ConnectionResult}" |grep Read_Master_Log_Pos: | awk '{print $2}'` execpos=`echo "${ConnectionResult}" |grep Exec_Master_Log_Pos: | awk '{print $2}'` # Output of different exit states ######################################################################### if [ ${check} = "NULL" ]; then echo "CRITICAL: Slave_SQL_Running is answering NULL"; exit ${STATE_CRITICAL}; fi if [ ${check} = ${crit} ]; then echo "CRITICAL: ${host}:${port} Slave_SQL_Running: ${check}"; exit ${STATE_CRITICAL}; fi if [ ${checkio} = ${crit} ]; then echo "CRITICAL: ${host} Slave_IO_Running: ${checkio}"; exit ${STATE_CRITICAL}; fi if [ ${checkio} = "Connecting" ]; then echo "CRITICAL: ${host} Slave_IO_Running: ${checkio}"; exit ${STATE_CRITICAL}; fi if [ ${check} = ${ok} ] && [ ${checkio} = ${ok} ]; then # Delay thresholds are set if [[ -n ${warn_delay} ]] && [[ -n ${crit_delay} ]]; then if ! [[ ${warn_delay} -gt 0 ]]; then echo "Warning threshold must be a valid integer greater than 0"; exit $STATE_UNKNOWN; fi if ! [[ ${crit_delay} -gt 0 ]]; then echo "Warning threshold must be a valid integer greater than 0"; exit $STATE_UNKNOWN; fi if [[ -z ${warn_delay} ]] || [[ -z ${crit_delay} ]]; then echo "Both warning and critical thresholds must be set"; exit $STATE_UNKNOWN; fi if [[ ${warn_delay} -gt ${crit_delay} ]]; then echo "Warning threshold cannot be greater than critical"; exit $STATE_UNKNOWN; fi if [[ ${delayinfo} -ge ${crit_delay} ]] then echo "CRITICAL: Slave is ${delayinfo} seconds behind Master | delay=${delayinfo}s"; exit ${STATE_CRITICAL} elif [[ ${delayinfo} -ge ${warn_delay} ]] then echo "WARNING: Slave is ${delayinfo} seconds behind Master | delay=${delayinfo}s"; exit ${STATE_WARNING} else # Everything looks OK here but now let us check if the replication is moving if [[ -n ${moving} ]] && [[ -n ${tmpfile} ]] && [[ $readpos -eq $execpos ]] then #echo "Debug: Read pos is $readpos - Exec pos is $execpos" # Check if tmp file exists curtime=`date +%s` if [[ -w $tmpfile ]] then tmpfiletime=`date +%s -r $tmpfile` if [[ `expr $curtime - $tmpfiletime` -gt ${moving} ]] then exectmp=`cat $tmpfile` #echo "Debug: Exec pos in tmpfile is $exectmp" if [[ $exectmp -eq $execpos ]] then # The value read from the tmp file and from db are the same. Replication hasnt moved! echo "WARNING: Slave replication has not moved in ${moving} seconds. Manual check required."; exit ${STATE_WARNING} else # Replication has moved since the tmp file was written. Delete tmp file and output OK. rm $tmpfile echo "OK: Slave SQL running: ${check} Slave IO running: ${checkio} / master: ${masterinfo} / slave is ${delayinfo} seconds behind master | delay=${delayinfo}s"; exit ${STATE_OK}; fi else echo "OK: Slave SQL running: ${check} Slave IO running: ${checkio} / master: ${masterinfo} / slave is ${delayinfo} seconds behind master | delay=${delayinfo}s"; exit ${STATE_OK}; fi else echo "$execpos" > $tmpfile echo "OK: Slave SQL running: ${check} Slave IO running: ${checkio} / master: ${masterinfo} / slave is ${delayinfo} seconds behind master | delay=${delayinfo}s"; exit ${STATE_OK}; fi else # Everything OK (no additional moving check) echo "OK: Slave SQL running: ${check} Slave IO running: ${checkio} / master: ${masterinfo} / slave is ${delayinfo} seconds behind master | delay=${delayinfo}s"; exit ${STATE_OK}; fi fi else # Without delay thresholds echo "OK: Slave SQL running: ${check} Slave IO running: ${checkio} / master: ${masterinfo} / slave is ${delayinfo} seconds behind master | delay=${delayinfo}s" exit ${STATE_OK}; fi fi echo "UNKNOWN: should never reach this part (Slave_SQL_Running is ${check}, Slave_IO_Running is ${checkio})" exit ${STATE_UNKNOWN}