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#!/usr/bin/env bash
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#########################################################################
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# Script: check_zpools.sh
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# Purpose: Nagios plugin to monitor status of zfs pool
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# Authors: Aldo Fabi First version (2006-09-01)
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# Vitaliy Gladkevitch Forked (2013-02-04)
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# Claudio Kuenzler Complete redo, perfdata, etc (2013-2014)
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# Doc: http://www.claudiokuenzler.com/nagios-plugins/check_zpools.php
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# History:
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# 2006-09-01 Original first version
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# 2006-10-04 Updated (no change history known)
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# 2013-02-04 Forked and released
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# 2013-05-08 Make plugin work on different OS, pepp up plugin
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# 2013-05-09 Bugfix in exit code handling
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# 2013-05-10 Removed old exit vars (not used anymore)
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# 2013-05-21 Added performance data (percentage used)
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# 2013-07-11 Bugfix in zpool health check
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# 2014-02-10 Bugfix in threshold comparison
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# 2014-03-11 Allow plugin to run without enforced thresholds
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#########################################################################
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### Begin vars
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STATE_OK=0 # define the exit code if status is OK
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STATE_WARNING=1 # define the exit code if status is Warning
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STATE_CRITICAL=2 # define the exit code if status is Critical
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STATE_UNKNOWN=3 # define the exit code if status is Unknown
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# Set path
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PATH=$PATH:/usr/sbin:/sbin
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export PATH
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### End vars
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#########################################################################
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help="check_zpools.sh (c) 2006-2014 several authors\n
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Usage: $0 -p (poolname|ALL) [-w warnpercent] [-c critpercent]\n
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Example: $0 -p ALL -w 80 -c 90"
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#########################################################################
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# Check necessary commands are available
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for cmd in zpool awk [
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do
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if ! `which ${cmd} 1>/dev/null`
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then
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echo "UNKNOWN: ${cmd} does not exist, please check if command exists and PATH is correct"
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exit ${STATE_UNKNOWN}
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fi
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done
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#########################################################################
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# Check for people who need help - aren't we all nice ;-)
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if [ "${1}" = "--help" -o "${#}" = "0" ];
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then
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echo -e "${help}";
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exit ${STATE_UNKNOWN};
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fi
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#########################################################################
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# Get user-given variables
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while getopts "p:w:c:" Input;
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do
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case ${Input} in
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p) pool=${OPTARG};;
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w) warn=${OPTARG};;
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c) crit=${OPTARG};;
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*) echo -e $help
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exit $STATE_UNKNOWN
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;;
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esac
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done
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#########################################################################
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# Did user obey to usage?
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if [ -z $pool ]; then echo -e $help; exit ${STATE_UNKNOWN}; fi
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#########################################################################
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# Verify threshold sense
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if [[ -n $warn ]] && [[ -z $crit ]]; then echo "Both warning and critical thresholds must be set"; exit $STATE_UNKNOWN; fi
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if [[ -z $warn ]] && [[ -n $crit ]]; then echo "Both warning and critical thresholds must be set"; exit $STATE_UNKNOWN; fi
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if [[ $warn -gt $crit ]]; then echo "Warning threshold cannot be greater than critical"; exit $STATE_UNKNOWN; fi
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#########################################################################
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# What needs to be checked?
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## Check all pools
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if [ $pool = "ALL" ]
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then
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POOLS=($(zpool list -Ho name))
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p=0
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for POOL in ${POOLS[*]}
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do
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CAPACITY=$(zpool list -Ho capacity $POOL | awk -F"%" '{print $1}')
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HEALTH=$(zpool list -Ho health $POOL)
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# Check with thresholds
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if [[ -n $warn ]] && [[ -n $crit ]]
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then
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if [[ $CAPACITY -ge $crit ]]
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then error[${p}]="POOL $POOL usage is CRITICAL (${CAPACITY}%)"; fcrit=1
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elif [[ $CAPACITY -ge $warn && $CAPACITY -lt $crit ]]
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then error[$p]="POOL $POOL usage is WARNING (${CAPACITY}%)"
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elif [ $HEALTH != "ONLINE" ]
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then error[${p}]="$POOL health is $HEALTH"; fcrit=1
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fi
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# Check without thresholds
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else
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if [ $HEALTH != "ONLINE" ]
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then error[${p}]="$POOL health is $HEALTH"; fcrit=1
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fi
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fi
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perfdata[$p]="$POOL=${CAPACITY}% "
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let p++
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done
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if [[ ${#error[*]} -gt 0 ]]
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then
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if [[ $fcrit -eq 1 ]]; then exit_code=2; else exit_code=1; fi
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echo "ZFS POOL ALARM: ${error[*]}|${perfdata[*]}"; exit ${exit_code}
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else echo "ALL ZFS POOLS OK (${POOLS[*]})|${perfdata[*]}"; exit 0
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fi
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## Check single pool
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else
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CAPACITY=$(zpool list -Ho capacity $pool | awk -F"%" '{print $1}')
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HEALTH=$(zpool list -Ho health $pool)
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if [[ -n $warn ]] && [[ -n $crit ]]
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then
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# Check with thresholds
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if [ $HEALTH != "ONLINE" ]; then echo "ZFS POOL $pool health is $HEALTH|$pool=${CAPACITY}%"; exit ${STATE_CRITICAL}
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elif [[ $CAPACITY -gt $crit ]]; then echo "ZFS POOL $pool usage is CRITICAL (${CAPACITY}%|$pool=${CAPACITY}%)"; exit ${STATE_CRITICAL}
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elif [[ $CAPACITY -gt $warn && $CAPACITY -lt $crit ]]; then echo "ZFS POOL $pool usage is WARNING (${CAPACITY}%)|$pool=${CAPACITY}%"; exit ${STATE_WARNING}
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else echo "ALL ZFS POOLS OK ($pool)|$pool=${CAPACITY}%"; exit ${STATE_OK}
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fi
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else
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# Check without thresholds
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if [ $HEALTH != "ONLINE" ]
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then echo "ZFS POOL $pool health is $HEALTH|$pool=${CAPACITY}%"; exit ${STATE_CRITICAL}
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else echo "ALL ZFS POOLS OK ($pool)|$pool=${CAPACITY}%"; exit ${STATE_OK}
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fi
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fi
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fi
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echo "UKNOWN - Should never reach this part"
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exit ${STATE_UNKNOWN}
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