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check_memory.sh
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check_memory.sh
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#!/usr/bin/env bash
# Origninal from http://blog.vergiss-blackjack.de/wp-uploads/2010/04/check_memory.txt
# Modified by Jon Schipp
# Nagios plugin to check memory consumption
# Excludes Swap and Caches so only the real memory consumption is considered
# Nagios Exit Codes
OK=0
WARNING=1
CRITICAL=2
UNKNOWN=3
# set default values for the thresholds
WARN=90
CRIT=95
usage()
{
cat <<EOF
Check memory consumption excluding swap and cache to determine real usage.
Options:
-c Critical threshold as percentage (0-100) (def: 95)
-w Warning threshold as percentage (0-100) (def: 90)
Usage: $0 -w 90 -c 95
EOF
}
while getopts "c:w:h" ARG;
do
case $ARG in
w) WARN=$OPTARG
;;
c) CRIT=$OPTARG
;;
h) usage
exit
;;
esac
done
MEM_TOTAL=`free | fgrep "Mem:" | awk '{ print $2 }'`;
MEM_USED=`free | fgrep "/+ buffers/cache" | awk '{ print $3 }'`;
PERCENTAGE=$(($MEM_USED*100/$MEM_TOTAL))
RESULT=$(echo "${PERCENTAGE}% ($((($MEM_USED)/1024)) of $((MEM_TOTAL/1024)) MB) used")
if [ $PERCENTAGE -gt $CRIT ]; then
echo "CRITICAL: $RESULT"
exit $CRITICAL;
elif [ $PERCENTAGE -gt $WARN ]; then
echo "WARNING: $RESULT"
exit $WARNING;
else
echo "OK: $RESULT"
exit $OK;
fi