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Contents
#!/bin/bash
#
# Check CPU usage
#
# ===
#
# Examples:
#
# check-cpu.sh -w 85 -c 95
#
# Date: 2014-09-12
# Author: Jun Ichikawa <jun1ka0@gmail.com>
#
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.
# get arguments
while getopts ':w:c:h' OPT; do
case $OPT in
w) WARN=$OPTARG;;
c) CRIT=$OPTARG;;
h) hlp="yes";;
*) unknown="yes";;
esac
done
PROC_PATH=${PROC_PATH:-'/proc'}
# usage
HELP="
usage: $0 [ -w value -c value -p -h ]
-w --> Warning percentage < value
-c --> Critical percentage < value
-h --> print this help screen
"
if [ "$hlp" = "yes" ]; then
echo "$HELP"
exit 0
fi
cpuusage1=(`cat /proc/stat | head -1`)
if [ ${#cpuusage1} -eq 0 ]; then
echo "CRITICAL - CPU UNKNOWN"
exit 2
fi
sleep 1
cpuusage2=(`cat $PROC_PATH/stat | head -1`)
if [ ${#cpuusage2} -eq 0 ]; then
echo "CRITICAL - CPU UNKNOWN"
exit 2
fi
WARN=${WARN:=90}
CRIT=${CRIT:=95}
cpu_diff=(0)
total=0
usage_diff=0
for i in `seq 1 9`
do
cpu_diff=("${cpu_diff[@]}" `echo "${cpuusage2[$i]}-${cpuusage1[$i]}" | bc`)
total=`echo "$total+${cpu_diff[$i]}" | bc`
if [ $i -ne "4" ]; then
usage_diff=`echo "$usage_diff+${cpu_diff[$i]}" | bc`
else
idl=$cpu_diff[$i]
fi
done
cpu_usage=`echo "scale=2; 100*$usage_diff/$total" | bc`
if [ "$(echo "${cpu_usage} > ${CRIT}" | bc)" -eq 1 ]; then
echo "CPU CRITICAL - ${cpu_usage}% is greater than critical point.[${CRIT}]"
exit 2
fi
if [ "$(echo "${cpu_usage} > ${WARN}" | bc)" -eq 1 ]; then
echo "CPU WARNING - ${cpu_usage}% is greater than warning point.[${WARN}]"
exit 1
fi
echo "CPU OK - Usage:${cpu_usage}"
exit 0
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