136 lines
4.6 KiB
Bash
Executable file
136 lines
4.6 KiB
Bash
Executable file
#!/bin/sh
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#
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# Plugin to check system memory
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# by hugme (nagios@hugme.org)
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# You can find my checks here: https://github.com/hugme/Nag_checks
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# Nagios script to check memory usage on linux server
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# version 1.3.0
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#
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# Deprecated and soon to be deleted: see version 2.0.0 with reworked perfdata.
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##########################################################
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MEMINFO="/proc/meminfo"
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OOMKILLINFO="/proc/vmstat"
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##########################################################
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# We call them functions because they're fun
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##########################################################
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print_help() {
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cat << EOF
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Linux Memory Plugin for Nagios
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Copyright (c) hugme (nagios@hugme.org)
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Version: 1.2.0
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Last Modified: 10-07-2014
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License: This software can be used for free unless I meet you, then you owe me lunch.
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Usage: check_linux_memory -w [warning %] -c [critical %]
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Options:
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-w [0-99] = Your warning %. 20 means 20% of your memory can remain before a warning alarm. Do not use the % sign.
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-c [0-99] = Your critical %. 10 means 10% of your memory can remain before a critical alarm. Do not use the % sign.
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-d [K,M,G,T] = divider K=kilobytes, M=megabytes, G=gigabytes, T=terabytes
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-f = Included for backwards compatability to older versions
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-n = Don't Include cached memory as free memory when calculating your percentage free
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-K = Don't check the OutOfMemory Kill counter
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-k [0-9999] = Threshold for OOMKill alert (default: 0)
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EOF
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}
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invalid_type() {
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echo "\nInvalid $1\n"
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print_help
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exit 3
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}
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##############################################
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## Suck in the user input
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##############################################
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while test -n "$1"; do
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case $1 in
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--help) print_help ; exit 0 ;;
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-h) print_help ; exit 0 ;;
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-w) WARN="$2"; shift ;;
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-c) CRIT="$2"; shift ;;
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-d) DIV="$2"; shift ;;
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-n) NC=1 ;;
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-k) THRESHOLD_OOMKILL="$2"; shift ;;
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-K) DISABLE_OOMKILL=1 ;;
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esac
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shift
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done
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##############################################
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## Set the defaults if needed
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##############################################
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[ -z "$WARN" ] && WARN=20
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[ -z "$CRIT" ] && CRIT=10
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[ -z "$DIV" ] && DIV=M
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[ -z "$FC" ] && FC=0
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[ -z "$DISABLE_OOMKILL" ] && DISABLE_OOMKILL=""
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[ -z "$THRESHOLD_OOMKILL" ] && THRESHOLD_OOMKILL=0
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##############################################
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## Check user input
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##############################################
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[ ! -z `echo $WARN | tr -d [:digit:]` ] && invalid_type "Warning: Warning value can only contain numbers"
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[ ! -z `echo $CRIT | tr -d [:digit:]` ] && invalid_type "Critical: Critical value can only contain numbers"
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[ "${WARN%.*}" -ge 100 ] && invalid_type "Warning: Warning must be smaller than 100%"
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[ "${CRIT%.*}" -ge 100 ] && invalid_type "Critical: Critical must be smaller than 100%"
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[ "${CRIT%.*}" -gt "${WARN%.*}" ] && invalid_type "Critical: Your Warning must be Higher than your Critical"
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case $DIV in
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k|K) DIVNUM=1;;
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m|M) DIVNUM=1024;;
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g|G) DIVNUM=1048576;;
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t|T) DIVNUM=1073741824;;
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*) invalid_type;;
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esac
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[ ! -f "$MEMINFO" ] && {
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echo "Your Memory info file seems to be missing"
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exit 1
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}
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if [ -z "$DISABLE_OOMKILL" ] && ! grep '^oom_kill ' "$OOMKILLINFO" >/dev/null 2>&1; then
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echo "UNKNOWN threshold set for oom_kill but the counter not available in '$OOMKILLINFO'."
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exit 3
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fi
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##############################################
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## Do the work
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## Pull the memory file into awk
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## grab the lines we need
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## Print the information
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##############################################
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RESULT=$(awk -v warn=$WARN -v crit=$CRIT -v div=$DIV -v divnum=$DIVNUM -v nc=$NC -v disable_oomkill=$DISABLE_OOMKILL -v threshold_oomkill=$THRESHOLD_OOMKILL '/^MemTotal:/ { total=$2 }
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/^MemTotal:/ { tot=$2 }
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/^MemFree:/ { free=$2 }
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/^Buffers:/ { buff=$2 }
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/^Cached:/ { cache=$2 }
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/^Active:/ { active=$2 }
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/^Inactive:/ { inactive=$2 }
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/^oom_kill / { oomkill=$2 }
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END { if ( nc != 1 ) { free=free+cache+buff }
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{ freeperct=free/tot*100 }
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if ( freeperct > warn ) { result="OK" ; xit="0"}
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if ( freeperct <= warn ) {
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if ( freeperct > crit ) { result="WARNING" ; xit="1" }
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else if ( freeperct <= crit ) { result="CRITICAL" ; xit="2" }
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}
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if ( disable_oomkill != 1 ) {
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oomkill_display=" OOMKills:"oomkill
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oomkill_perfdata=" oomkill="oomkill";;"threshold_oomkill";0"
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if ( oomkill > threshold_oomkill ) { result="CRITICAL - Out of memory kills detected" ; xit="2" }
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}
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{print xit" MEMORY "result" - "freeperct"% Free - Total:"tot/divnum div" Active:"active/divnum div" Inactive:"inactive/divnum div" Buffers:"buff/divnum div" Cached:"cache/divnum div" "oomkill_display" |Free="freeperct";"warn";"crit";0 Active="active";0;0;0 Inactive="inactive";0;0;0 Buffers="buff";0;0;0 Cached="cache";0;0;0"oomkill_perfdata }
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}' "$MEMINFO" "$OOMKILLINFO" )
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echo ${RESULT#* }
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exit ${RESULT%% *}
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