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+Le monitoring de la mémoire est fait maison via un code shell ancestral transmit de geek en geek dont l'origine se perd dans epoch.
+<code bash /usr/lib/nagios/plugins/check_mem.sh>
+#!/bin/bash
+#nagios exit code
+STATE_OK=0
+STATE_WARNING=1
+STATE_CRITICAL=2
+STATE_UNKNOWN=3
+help () {
+        local command=`basename $0`
+        echo "NAME
+        ${command} -- check memory status
+SYNOPSIS
+        ${command} [OPTION]
+DESCRIPTION
+        -w warning=<percent>
+        -c critical=<percent>
+USAGE:
+        $0 -w 50% -c 60%" 1>&2
+        exit ${STATE_WARNING}
+}
+check_num () {
+        local num_str="$1"
+        echo ${num_str}|grep -E '^[0-9]+$' >/dev/null 2>&1 || local stat='not a positive integers!'
+        if [ "${stat}" = 'not a positive integers!' ];then
+                echo "${num_str} ${stat}" 1>&2
+                exit ${STATE_WARNING}
+        else
+                local num_int=`echo ${num_str}*1|bc`
+                if [ ${num_int} -lt 0 ];then
+                        echo "${num_int} must be greater than 0!" 1>&2
+                        exit ${STATE_WARNING}
+                fi
+        fi
+}
+#input
+while getopts w:c: opt
+do
+        case "$opt" in
+        w)
+                warning=$OPTARG
+                warning_num=`echo "${warning}"|sed  's/%//g'`
+                check_num "${warning_num}"
+        ;;
+        c)
+                critical=$OPTARG
+                critical_num=`echo "${critical}"|sed  's/%//g'`
+                check_num "${critical_num}"
+        ;;
+        *) help;;
+        esac
+done
+shift $[ $OPTIND - 1 ]
+[ $# -gt 0 -o -z "${warning_num}" -o -z "${critical_num}" ] && help
+if [ -n "${warning_num}" -a -n "${critical_num}" ];then
+        if [ ${warning_num} -ge ${critical_num} ];then
+                echo "-w ${warning} must lower than -c ${critical}!" 1>&2
+                exit ${STATE_UNKNOWN}
+        fi
+fi
+datas=`awk -F':|k' '$2~/[0-9]+/{datas[$1]=$2}END{for (data in datas) {print data"="datas[data]}}' /proc/meminfo | grep -Ev '[)|(]'`
+var=`echo "${datas}"|sed 's/ //g'`
+eval "${var}"
+MemUsed=`echo ${MemTotal}-${MemFree}-${Cached}-${Buffers}|bc`
+MemUsage=`echo "${MemUsed}/${MemTotal}*100"|bc -l`
+MemUsage_num=`echo ${MemUsage}/1|bc`
+#echo ${MemUsage_num}
+MemTotal_MB=`echo ${MemTotal}/1024|bc`
+MemUsed_MB=`echo ${MemUsed}/1024|bc`
+MemFree_MB=`echo ${MemFree}/1024|bc`
+Cached_MB=`echo ${Cached}/1024|bc`
+Buffers_MB=`echo ${Buffers}/1024|bc`
+message () {
+local stat="$1"
+echo "MEMORY is ${stat} - Usage: ${MemUsage_num}%. Total: ${MemTotal_MB} MB Used: ${MemUsed_MB} MB Free: ${MemFree_MB} MB | Used=${MemUsed_MB};; Cached=${Cached_MB};; Buffers=${Buffers_MB};; Free=${MemFree_MB};;"
+}
+[ ${MemUsage_num} -lt ${warning_num} ] && message "OK" && exit ${STATE_OK}
+[ ${MemUsage_num} -ge ${critical_num} ] && message "Critical" && exit ${STATE_CRITICAL}
+[ ${MemUsage_num} -ge ${warning_num} ] && message "Warning" && exit ${STATE_WARNING}
+</code>
+L'intégration icinga2 :
+<code C>
+object CheckCommand "memory" {
+    command = [ PluginDir + "/check_mem.sh" ]
+    arguments = {
+        "-c" = {
+            value = "$memory_critical$"
+            required = true
+        }
+        "-w" = {
+            value = "$memory_warning$"
+            required = false
+        }
+    }
+    vars.memory_critical = 95
+    vars.memory_warning = 80
+}
+apply Service "Check memory" {
+  import "generic-service"
+  check_command = "memory"
+  command_endpoint = host.vars.client_endpoint
+  assign where host.address && !host.vars.external
+}
+</code>