NagiosScripts/check_linux_swap at master · tim-koehler/NagiosScripts · GitHub

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#!/bin/bash

Syntax()
{
   echo " "
   echo "  Command Syntax: check_linux_swap [-H host] [-c val] [-w val]"
   echo " "
   exit 3;
}

if [[ $# -ne 6 ]]
then
  Syntax
fi

valw=0
valc=0
host=""

while [[ $# > 0 ]]
do
   par=$1
   case $par in
     -c) shift
         valc=$1;;
     -w) shift
         valw=$1;;
     -H) shift
         host=$1;;
     -h) shift
         Syntax
         exit;;
      *) shift;;
   esac
done

valc=$(echo "$valc*1.0" | bc)
valw=$(echo "$valw*1.0" | bc)

output=$(ssh nagios@$host "free")
if [[ -z $output ]]
then
	echo "SSH Error"
	exit 3
fi

totalSwap=$(echo "$output" | grep "Swap" | awk '{print $2}')
usedSwap=$(echo "$output" | grep "Swap" | awk '{print $3}')

value_inuse=$(echo "($usedSwap / $totalSwap) * 100" | bc -l | cut -c 1-4)

exitCode=0
status="OK"

if (( $(echo "$value_inuse > $valw" | bc -l) ))
then
	exitCode=1
	status="WARNING"
fi

if (( $(echo "$value_inuse > $valc" | bc -l) ))
then
	exitCode=2
	status="CRITICAL"
fi

echo "SWAP $status :: SwapUsed = $value_inuse% | SwapUsed=$value_inuse%;$valw;$valc"
exit $exitCode