nagios: reworked perfdata for check_linux_memory

nagios/check_linux_memory.sh

@@ -6,6 +6,7 @@
 # Nagios script to check memory usage on linux server
 # version 1.3.0
 #
+# Deprecated and soon to be deleted: see version 2.0.0 with reworked perfdata.
 ##########################################################
 
 MEMINFO="/proc/meminfo"

nagios/check_linux_memory2.sh

@@ -0,0 +1,148 @@
+#!/bin/sh
+#
+# Plugin to check system memory
+# by hugme (nagios@hugme.org)
+# You can find my checks here: https://github.com/hugme/Nag_checks
+# Nagios script to check memory usage on linux server
+# version 2.0.0
+#
+##########################################################
+
+MEMINFO="/proc/meminfo"
+OOMKILLINFO="/proc/vmstat"
+
+##########################################################
+# We call them functions because they're fun
+##########################################################
+
+print_help() {
+cat << EOF
+Linux Memory Plugin for Nagios
+Copyright (c) hugme (nagios@hugme.org)
+Version: 1.2.0
+Last Modified: 10-07-2014
+License: This software can be used for free unless I meet you, then you owe me lunch.
+
+Usage: check_linux_memory -w [warning %] -c [critical %]
+
+Options:
+ -w [0-99]		= Your warning %. 20 means 20% of your memory can remain before a warning alarm. Do not use the % sign.
+ -c [0-99]		= Your critical %. 10 means 10% of your memory can remain before a critical alarm. Do not use the % sign.
+ -d [K,M,G,T]	= divider K=kilobytes, M=megabytes, G=gigabytes, T=terabytes
+ -f		= Included for backwards compatability to older versions
+ -n		= Don't Include cached memory as free memory when calculating your percentage free
+ -K		= Don't check the OutOfMemory Kill counter
+ -k [0-9999]	= Threshold for OOMKill alert (default: 0)
+EOF
+	}
+
+invalid_type() {
+	echo "\nInvalid $1\n"
+	print_help
+	exit 3
+	}
+
+##############################################
+## Suck in the user input
+##############################################
+
+
+while test -n "$1"; do
+ case $1 in
+  --help) print_help ; exit 0 ;;
+  -h) print_help ; exit 0 ;;
+  -w) WARN="$2"; shift ;;
+  -c) CRIT="$2"; shift ;;
+  -d) DIV="$2"; shift ;;
+  -n) NC=1 ;;
+  -k) THRESHOLD_OOMKILL="$2"; shift ;;
+  -K) DISABLE_OOMKILL=1 ;;
+ esac
+ shift
+done
+
+##############################################
+## Set the defaults if needed
+##############################################
+
+[ -z "$WARN" ] && WARN=20
+[ -z "$CRIT" ] && CRIT=10
+[ -z "$DIV" ] && DIV=M
+[ -z "$FC" ] && FC=0
+[ -z "$DISABLE_OOMKILL" ] && DISABLE_OOMKILL=""
+[ -z "$THRESHOLD_OOMKILL" ] && THRESHOLD_OOMKILL=0
+
+##############################################
+## Check user input
+##############################################
+
+[ ! -z `echo $WARN | tr -d [:digit:]` ] && invalid_type "Warning: Warning value can only contain numbers"
+[ ! -z `echo $CRIT | tr -d [:digit:]` ] && invalid_type "Critical: Critical value can only contain numbers"
+[ "${WARN%.*}" -ge 100 ] && invalid_type "Warning: Warning must be smaller than 100%"
+[ "${CRIT%.*}" -ge 100 ] && invalid_type "Critical: Critical must be smaller than 100%"
+[ "${CRIT%.*}" -gt "${WARN%.*}" ] && invalid_type "Critical: Your Warning must be Higher than your Critical"
+
+case $DIV in
+	k|K) DIVNUM=1024;;
+	m|M) DIVNUM=1048576;;
+	g|G) DIVNUM=1073741824;;
+	t|T) DIVNUM=1099511627776;;
+	*) invalid_type;;
+esac
+
+[ ! -f "$MEMINFO" ] && {
+	echo "Your Memory info file seems to be missing"
+	exit 1
+	}
+
+if [ -z "$DISABLE_OOMKILL" ] && ! grep '^oom_kill ' "$OOMKILLINFO" >/dev/null 2>&1; then
+	echo "UNKNOWN threshold set for oom_kill but the counter not available in '$OOMKILLINFO'."
+	exit 3
+fi
+
+##############################################
+## Do the work
+## Pull the memory file into awk
+## grab the lines we need
+## Print the information
+##############################################
+
+RESULT=$(awk -v warnperct=$WARN -v critperct=$CRIT -v div=$DIV -v divnum=$DIVNUM -v nc=$NC -v disable_oomkill=$DISABLE_OOMKILL -v threshold_oomkill=$THRESHOLD_OOMKILL '
+{
+	UnitQuantity["B"]=1
+	UnitQuantity["kB"]=1024
+	UnitQuantity["MB"]=1048576
+	UnitQuantity["GB"]=1073741824
+	UnitQuantity["TB"]=1099511627776
+}
+/^MemTotal:/ { tot=$2*UnitQuantity[$3] }
+/^MemFree:/ { free=$2*UnitQuantity[$3] }
+/^Buffers:/ { buff=$2*UnitQuantity[$3] }
+/^Cached:/ { cache=$2*UnitQuantity[$3] }
+/^Active:/ { active=$2*UnitQuantity[$3] }
+/^Inactive:/ { inactive=$2*UnitQuantity[$3] }
+/^oom_kill / { oomkill=$2 }
+END { if ( nc != 1 ) { free=free+cache+buff }
+	{
+		freeperct=free/tot*100
+		warn=int(warnperct*tot/100)  # convert to int to avoid dealing with weird display
+		crit=int(critperct*tot/100)
+	}
+	if ( freeperct > warnperct ) { result="OK" ; xit="0"}
+	if ( freeperct <= warnperct ) {
+		if ( freeperct > critperct ) { result="WARNING" ; xit="1" }
+		else if ( freeperct <= critperct ) { result="CRITICAL" ; xit="2" }
+		}
+	if ( disable_oomkill != 1 ) {
+		oomkill_display=" OOMKills:"oomkill
+		oomkill_perfdata=" oomkill="oomkill";;"threshold_oomkill";0"
+		if ( oomkill > threshold_oomkill ) { result="CRITICAL - Out of memory kills detected" ; xit="2" }
+	}
+	{
+		print xit" MEMORY "result" - "freeperct"% Free - Total:"tot/divnum div" Active:"active/divnum div" Inactive:"inactive/divnum div" Buffers:"buff/divnum div" Cached:"cache/divnum div" "oomkill_display" |Active="active"B;0;0;0 Buffers="buff"B;0;0;0 Cached="cache"B;0;0;0 Free="free"B;"warn";"crit";0 Inactive="inactive"B;0;0;0"oomkill_perfdata
+	}
+}' "$MEMINFO" "$OOMKILLINFO" )
+
+echo ${RESULT#* }
+exit ${RESULT%% *}
+

nagios/etc/30_nrpe-basic.cfg

@@ -5,7 +5,7 @@ command[check_load]=/usr/lib/nagios/plugins/check_load -w 1,1,1 -c 3,2,2
 command[check_network_volume]=/usr/local/share/scripts-admin/nagios/check_network_volume.sh
 command[check_swaping]=/usr/local/share/scripts-admin/nagios/check_swaping.sh
 command[check_swap]=/usr/lib/nagios/plugins/check_swap -w 60% -c 30%
-command[check_linux_memory]=/usr/local/share/scripts-admin/nagios/check_linux_memory.sh
+command[check_linux_memory]=/usr/local/share/scripts-admin/nagios/check_linux_memory2.sh
 
 # Petite commande temporaire pour étudier souci neighbour table overflow
 command[check_network-neighbour-table]=/usr/local/share/scripts-admin/nagios/check_network-neighbour-table.sh