#!/bin/bash
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
PROGNAME=`basename $0`
VERSION="Version 1.0,"
AUTHOR="2009, Mike Adolphs (http://www.matejunkie.com/)"
ST_OK=0
ST_WR=1
ST_CR=2
ST_UK=3
interval=1
print_version() {
echo "$VERSION $AUTHOR"
}
print_help() {
print_version $PROGNAME $VERSION
echo ""
echo "$PROGNAME is a Nagios plugin to monitor CPU utilization. It makes"
echo "use of /proc/stat and calculates it through Jiffies rather than"
echo "using another frontend tool like iostat or top."
echo "When using optional warning/critical thresholds all values except"
echo "idle are aggregated and compared to the thresholds. There's"
echo "currently no support for warning/critical thresholds for specific"
echo "usage parameters."
echo ""
echo "$PROGNAME [-i/--interval] [-w/--warning] [-c/--critical]"
echo ""
echo "Options:"
echo " --interval|-i)"
echo " Defines the pause between the two times /proc/stat is being"
echo " parsed. Higher values could lead to more accurate result."
echo " Default is: 1 second"
echo " --warning|-w)"
echo " Sets a warning level for CPU user. Default is: off"
echo " --critical|-c)"
echo " Sets a critical level for CPU user. Default is: off"
exit $ST_UK
}
while test -n "$1"; do
case "$1" in
--help|-h)
print_help
exit $ST_UK
;;
--version|-v)
print_version $PROGNAME $VERSION
exit $ST_UK
;;
--interval|-i)
interval=$2
shift
;;
--warning|-w)
warn=$2
shift
;;
--critical|-c)
crit=$2
shift
;;
*)
echo "Unknown argument: $1"
print_help
exit $ST_UK
;;
esac
shift
done
val_wcdiff() {
if [ ${warn} -gt ${crit} ]
then
wcdiff=1
fi
}
get_cpuvals() {
tmp1_cpu_user=`grep -m1 '^cpu' /proc/stat|awk '{print $2}'`
tmp1_cpu_nice=`grep -m1 '^cpu' /proc/stat|awk '{print $3}'`
tmp1_cpu_sys=`grep -m1 '^cpu' /proc/stat|awk '{print $4}'`
tmp1_cpu_idle=`grep -m1 '^cpu' /proc/stat|awk '{print $5}'`
tmp1_cpu_iowait=`grep -m1 '^cpu' /proc/stat|awk '{print $6}'`
tmp1_cpu_irq=`grep -m1 '^cpu' /proc/stat|awk '{print $7}'`
tmp1_cpu_softirq=`grep -m1 '^cpu' /proc/stat|awk '{print $8}'`
tmp1_cpu_total=`expr $tmp1_cpu_user + $tmp1_cpu_nice + $tmp1_cpu_sys + \
$tmp1_cpu_idle + $tmp1_cpu_iowait + $tmp1_cpu_irq + $tmp1_cpu_softirq`
sleep $interval
tmp2_cpu_user=`grep -m1 '^cpu' /proc/stat|awk '{print $2}'`
tmp2_cpu_nice=`grep -m1 '^cpu' /proc/stat|awk '{print $3}'`
tmp2_cpu_sys=`grep -m1 '^cpu' /proc/stat|awk '{print $4}'`
tmp2_cpu_idle=`grep -m1 '^cpu' /proc/stat|awk '{print $5}'`
tmp2_cpu_iowait=`grep -m1 '^cpu' /proc/stat|awk '{print $6}'`
tmp2_cpu_irq=`grep -m1 '^cpu' /proc/stat|awk '{print $7}'`
tmp2_cpu_softirq=`grep -m1 '^cpu' /proc/stat|awk '{print $8}'`
tmp2_cpu_total=`expr $tmp2_cpu_user + $tmp2_cpu_nice + $tmp2_cpu_sys + \
$tmp2_cpu_idle + $tmp2_cpu_iowait + $tmp2_cpu_irq + $tmp2_cpu_softirq`
diff_cpu_user=`echo "${tmp2_cpu_user} - ${tmp1_cpu_user}" | bc -l`
diff_cpu_nice=`echo "${tmp2_cpu_nice} - ${tmp1_cpu_nice}" | bc -l`
diff_cpu_sys=`echo "${tmp2_cpu_sys} - ${tmp1_cpu_sys}" | bc -l`
diff_cpu_idle=`echo "${tmp2_cpu_idle} - ${tmp1_cpu_idle}" | bc -l`
diff_cpu_iowait=`echo "${tmp2_cpu_iowait} - ${tmp1_cpu_iowait}" | bc -l`
diff_cpu_irq=`echo "${tmp2_cpu_irq} - ${tmp1_cpu_irq}" | bc -l`
diff_cpu_softirq=`echo "${tmp2_cpu_softirq} - ${tmp1_cpu_softirq}" \
| bc -l`
diff_cpu_total=`echo "${tmp2_cpu_total} - ${tmp1_cpu_total}" | bc -l`
cpu_user=`echo "scale=2; (1000*${diff_cpu_user}/${diff_cpu_total}+5)/10" \
| bc -l | sed 's/^\./0./'`
cpu_nice=`echo "scale=2; (1000*${diff_cpu_nice}/${diff_cpu_total}+5)/10" \
| bc -l | sed 's/^\./0./'`
cpu_sys=`echo "scale=2; (1000*${diff_cpu_sys}/${diff_cpu_total}+5)/10" \
| bc -l | sed 's/^\./0./'`
cpu_idle=`echo "scale=2; (1000*${diff_cpu_idle}/${diff_cpu_total}+5)/10" \
| bc -l | sed 's/^\./0./'`
cpu_iowait=`echo "scale=2; (1000*${diff_cpu_iowait}/${diff_cpu_total}+5)\\
/10" | bc -l | sed 's/^\./0./'`
cpu_irq=`echo "scale=2; (1000*${diff_cpu_irq}/${diff_cpu_total}+5)/10" \
| bc -l | sed 's/^\./0./'`
cpu_softirq=`echo "scale=2; (1000*${diff_cpu_softirq}/${diff_cpu_total}\\
+5)/10" | bc -l | sed 's/^\./0./'`
cpu_total=`echo "scale=2; (1000*${diff_cpu_total}/${diff_cpu_total}+5)\\
/10" | bc -l | sed 's/^\./0./'`
cpu_usage=`echo "(${cpu_user}+${cpu_nice}+${cpu_sys}+${cpu_iowait}+\\
${cpu_irq}+${cpu_softirq})/1" | bc`
}
do_output() {
output="user: ${cpu_user}, nice: ${cpu_nice}, sys: ${cpu_sys}, \
iowait: ${cpu_iowait}, irq: ${cpu_irq}, softirq: ${cpu_softirq} \
idle: ${cpu_idle}"
}
do_perfdata() {
perfdata="'user'=${cpu_user} 'nice'=${cpu_nice} 'sys'=${cpu_sys} \
'softirq'=${cpu_softirq} 'iowait'=${cpu_iowait} 'irq'=${cpu_irq} \
'idle'=${cpu_idle}"
}
if [ -n "$warn" -a -n "$crit" ]
then
val_wcdiff
if [ "$wcdiff" = 1 ]
then
echo "Please adjust your warning/critical thresholds. The warning\\
must be lower than the critical level!"
exit $ST_UK
fi
fi
get_cpuvals
do_output
do_perfdata
if [ -n "$warn" -a -n "$crit" ]
then
if [ "$cpu_usage" -ge "$warn" -a "$cpu_usage" -lt "$crit" ]
then
echo "WARNING - ${output} | ${perfdata}"
exit $ST_WR
elif [ "$cpu_usage" -ge "$crit" ]
then
echo "CRITICAL - ${output} | ${perfdata}"
exit $ST_CR
else
echo "OK - ${output} | ${perfdata}"
exit $ST_OK
fi
else
echo "OK - ${output} | ${perfdata}"
exit $ST_OK
fi