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#!/bin/bash # This script validates # # Swap memory usage on a machine # # No machine should never ever swap anything! (following the old saw: "Memory is RAM!") # # usage: "check_swap -w WARNING(INTEGER in MBytes) -c CRITICAL(INTEGER in MBytes)" # # WARNING < CRIT # # Returns the nagios native status codes as defined in: # # Nagios Status # # 0 = OK (SWAP usage below WARNING) # 1 = WARNING (SWAP usage between WARNING AND CRITICAL) # 2 = CRITICAL (SWAP usage higher than CRITICAL) # 3 = UNKNOWN (Wrong usage) # # * 20111028 - initial release by Daniel Klockenkaemper <dk@marketing-factory.de> ## USAGE MESSAGE usage() { cat << EOF usage: $0 options This script runs a Swap test on a machine. OPTIONS: -h Show this message -w Warning Level in MBytes (not optional) -c Critical Level in MBytes (not optional) Warning Level should be lower than Critical Level! EOF } SWAP_WARN= SWAP_CRIT= ## FETCH ARGUMENTS while getopts "hw:c:" OPTION; do case "${OPTION}" in h) usage exit 3 ;; w) SWAP_WARN=${OPTARG} ;; c) SWAP_CRIT=${OPTARG} ;; ?) usage exit 3 ;; esac done ## CHECK ARGUMENTS if [ -z ${SWAP_WARN} ] || [ -z ${SWAP_CRIT} ] || [ ${SWAP_WARN} -gt ${SWAP_CRIT} ] ; then usage exit 3 fi ## GET SWAP INFO FROM MACHINE TOTAL_SWAP=$(free -m | grep Swap | awk '{print $2}') USED_SWAP=$(free -m | grep Swap | awk '{print $3}') FREE_SWAP=$(free -m | grep Swap | awk '{print $4}') ## CHECK SWAPPING ON MACHINE if [ ${USED_SWAP} -lt ${SWAP_WARN} ]; then ## SWAP IS OK LINE="SWAP OK! Total Swap: ${TOTAL_SWAP}MB , used Swap ${USED_SWAP}MB , free Swap ${FREE_SWAP}MB." COUNT=`echo $LINE | awk '{print $9}'` echo $LINE \| swap_used=$COUNT\;${SWAP_WARN}\;${SWAP_CRIT}\;0\; exit 0 elif [ ${USED_SWAP} -gt ${SWAP_WARN} ] && [ ${USED_SWAP} -lt ${SWAP_CRIT} ] || [ ${USED_SWAP} -eq ${SWAP_WARN} ]; then ## SWAP IS IN WARNING STATE LINE="SWAP WARNING! Total Swap: ${TOTAL_SWAP}MB , used Swap ${USED_SWAP}MB , free Swap ${FREE_SWAP}MB." COUNT=`echo $LINE | awk '{print $9}'` echo $LINE \| swap_used=$COUNT\;${SWAP_WARN}\;${SWAP_CRIT}\;0\; exit 1 elif [ ${USED_SWAP} -gt ${SWAP_CRIT} ] || [ ${USED_SWAP} -eq ${SWAP_CRIT} ]; then ## SWAP IS IN CRITICAL STATE LINE="SWAP CRITICAL! Total Swap: ${TOTAL_SWAP}MB , used Swap ${USED_SWAP}MB , free Swap ${FREE_SWAP}MB." COUNT=`echo $LINE | awk '{print $9}'` echo $LINE \| swap_used=$COUNT\;${SWAP_WARN}\;${SWAP_CRIT}\;0\; exit 2 else ## SHOULD NEVER REACH THIS POINT, MUST BE USAGE :) usage exit 3 fi
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