此脚本参考了Nagios的官方文档https://exchange.nagios.org/并其进行了代码精简和移值，原代码是运行在ksh下面的，定义数组的方式跟bash还是有区别的；另外，为了反映CPU的繁忙程度，特的抓取了vmstart命令中的平均值并将其打印出来。为了方便大家下载，特的将其收录进了我的github中。
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#!/bin/bash
# CPU Utilization Statistics plugin for Nagios
IOSTAT=
"/usr/bin/iostat"
# Nagios return codes
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
# Plugin parameters value if not define
LIST_WARNING_THRESHOLD=
"70,40,30"
LIST_CRITICAL_THRESHOLD=
"90,60,40"
INTERVAL_SEC=1
NUM_REPORT=5
# Plugin variable description
PROGNAME=$(
basename
$0)
if
[ ! -x $IOSTAT ];
then
echo
"UNKNOWN: iostat not found or is not executable by the nagios user."
exit
$STATE_UNKNOWN
fi
print_usage() {
echo
""
echo
"$PROGNAME $RELEASE - CPU Utilization check script for Nagios"
echo
""
echo
"Usage: check_cpu_utili.sh -w -c (-i -n)"
echo
""
echo
" -w Warning threshold in % for warn_user,warn_system,warn_iowait CPU (default : 70,40,30)"
echo
" Exit with WARNING status if cpu exceeds warn_n"
echo
" -c Critical threshold in % for crit_user,crit_system,crit_iowait CPU (default : 90,60,40)"
echo
" Exit with CRITICAL status if cpu exceeds crit_n"
echo
" -i Interval in seconds for iostat (default : 1)"
echo
" -n Number report for iostat (default : 3)"
echo
" -h Show this page"
echo
""
echo
"Usage: $PROGNAME"
echo
"Usage: $PROGNAME --help"
echo
""
exit
0
}
print_help() {
print_usage
echo
""
echo
"This plugin will check cpu utilization (user,system,CPU_Iowait in %)"
echo
""
exit
0
}
# Parse parameters
while
[ $
# -gt 0 ]; do
case
"$1"
in
-h | --help)
print_help
exit
$STATE_OK
;;
-
v
| --version)
print_release
exit
$STATE_OK
;;
-w | --warning)
shift
LIST_WARNING_THRESHOLD=$1
;;
-c | --critical)
shift
LIST_CRITICAL_THRESHOLD=$1
;;
-i | --interval)
shift
INTERVAL_SEC=$1
;;
-n | --number)
shift
NUM_REPORT=$1
;;
*)
echo
"Unknown argument: $1"
print_usage
exit
$STATE_UNKNOWN
;;
esac
shift
done
# List to Table for warning threshold (compatibility with
TAB_WARNING_THRESHOLD=(`
echo
$LIST_WARNING_THRESHOLD |
sed
's/,/ /g'
`)
#declare -a TAB_WARNIG_THRESHOLD
if
[
"${#TAB_WARNING_THRESHOLD[@]}"
-
ne
"3"
];
then
echo
"ERROR : Bad count parameter in Warning Threshold"
exit
$STATE_WARNING
else
USER_WARNING_THRESHOLD=`
echo
${TAB_WARNING_THRESHOLD[0]}`
SYSTEM_WARNING_THRESHOLD=`
echo
${TAB_WARNING_THRESHOLD[1]}`
IOWAIT_WARNING_THRESHOLD=`
echo
${TAB_WARNING_THRESHOLD[2]}`
fi
# List to Table for critical threshold
TAB_CRITICAL_THRESHOLD=(`
echo
$LIST_CRITICAL_THRESHOLD |
sed
's/,/ /g'
`)
if
[
"${#TAB_CRITICAL_THRESHOLD[@]}"
-
ne
"3"
];
then
echo
"ERROR : Bad count parameter in CRITICAL Threshold"
exit
$STATE_WARNING
else
USER_CRITICAL_THRESHOLD=`
echo
${TAB_CRITICAL_THRESHOLD[0]}`
SYSTEM_CRITICAL_THRESHOLD=`
echo
${TAB_CRITICAL_THRESHOLD[1]}`
IOWAIT_CRITICAL_THRESHOLD=`
echo
${TAB_CRITICAL_THRESHOLD[2]}`
fi
if
[ ${TAB_WARNING_THRESHOLD[0]} -
ge
${TAB_CRITICAL_THRESHOLD[0]} -o ${TAB_WARNING_THRESHOLD[1]} -
ge
${TAB_CRITICAL_THRESHOLD[1]} -o ${TAB_WARNING_THRESHOLD[2]} -
ge
${TAB_CRITICAL_THRESHOLD[2]} ];
then
echo
"ERROR : Critical CPU Threshold lower as Warning CPU Threshold "
exit
$STATE_WARNING
fi
CPU_REPORT=`iostat -c $INTERVAL_SEC $NUM_REPORT |
sed
-e
's/,/./g'
|
tr
-s
' '
';'
|
sed
'/^$/d'
|
tail
-1`
CPU_REPORT_SECTIONS=`
echo
${CPU_REPORT} |
grep
';'
-o |
wc
-l`
CPU_USER=`
echo
$CPU_REPORT |
cut
-d
";"
-f 2`
CPU_SYSTEM=`
echo
$CPU_REPORT |
cut
-d
";"
-f 4`
CPU_IOWAIT=`
echo
$CPU_REPORT |
cut
-d
";"
-f 5`
CPU_STEAL=`
echo
$CPU_REPORT |
cut
-d
";"
-f 6`
CPU_IDLE=`
echo
$CPU_REPORT |
cut
-d
";"
-f 7`
NAGIOS_DATA=
"user=${CPU_USER}%,system=${CPU_SYSTEM}%,iowait=${CPU_IOWAIT}%,idle=${CPU_IDLE}%"
# Add for integer shell issue
CPU_USER_MAJOR=`
echo
$CPU_USER|
cut
-d
"."
-f 1`
CPU_SYSTEM_MAJOR=`
echo
$CPU_SYSTEM |
cut
-d
"."
-f 1`
CPU_IOWAIT_MAJOR=`
echo
$CPU_IOWAIT |
cut
-d
"."
-f 1`
CPU_IDLE_MAJOR=`
echo
$CPU_IDLE |
cut
-d
"."
-f 1`
CPU_VMSTAT_R=`vmstat 1 4 |
sed
-n
'3,$'
p |
awk
'BEGINE{SUM=0} {SUM += $1} END {print SUM/4}'
`
# Return
if
[ ${CPU_USER_MAJOR} -
ge
$USER_CRITICAL_THRESHOLD ];
then
echo
"CPU STATISTICS OK : ${NAGIOS_DATA} The averange value of r in vmstat :${CPU_VMSTAT_R}"
exit
$STATE_CRITICAL
elif
[ ${CPU_SYSTEM_MAJOR} -
ge
$SYSTEM_CRITICAL_THRESHOLD ];
then
echo
"CPU STATISTICS OK : ${NAGIOS_DATA} The averange value of r in vmstat :${CPU_VMSTAT_R}"
exit
$STATE_CRITICAL
elif
[ ${CPU_IOWAIT_MAJOR} -
ge
$IOWAIT_CRITICAL_THRESHOLD ];
then
echo
"CPU STATISTICS OK : ${NAGIOS_DATA} The averange value of r in vmstat :${CPU_VMSTAT_R}"
exit
$STATE_CRITICAL
elif
[ ${CPU_USER_MAJOR} -
ge
$USER_WARNING_THRESHOLD ] && [ ${CPU_USER_MAJOR} -lt $USER_CRITICAL_THRESHOLD ];
then
#echo "CPU STATISTICS WARNING : ${NAGIOS_DATA}"
echo
"CPU STATISTICS OK : ${NAGIOS_DATA} The averange value of r in vmstat :${CPU_VMSTAT_R}"
exit
$STATE_WARNING
elif
[ ${CPU_SYSTEM_MAJOR} -
ge
$SYSTEM_WARNING_THRESHOLD ] && [ ${CPU_SYSTEM_MAJOR} -lt $SYSTEM_CRITICAL_THRESHOLD ];
then
#echo "CPU STATISTICS WARNING : ${NAGIOS_DATA}"
echo
"CPU STATISTICS OK : ${NAGIOS_DATA} The averange value of r in vmstat :${CPU_VMSTAT_R}"
exit
$STATE_WARNING
elif
[ ${CPU_IOWAIT_MAJOR} -
ge
$IOWAIT_WARNING_THRESHOLD ] && [ ${CPU_IOWAIT_MAJOR} -lt $IOWAIT_CRITICAL_THRESHOLD ];
then
#echo "CPU STATISTICS WARNING : ${NAGIOS_DATA}"
echo
"CPU STATISTICS OK : ${NAGIOS_DATA} The averange value of r in vmstat :${CPU_VMSTAT_R}"
exit
$STATE_WARNING
else
#echo "The averange value of r in vmstat :${CPU_VMSTAT_R}\c"
echo
"CPU STATISTICS OK : ${NAGIOS_DATA};The averange value of r in vmstat:${CPU_VMSTAT_R}"
exit
$STATE_OK
fi
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将脚本作为Nagios插件放入server端的/usr/local/nagios/libexec/目录下，运行效果如下所示：
本文转自 抚琴煮酒 51CTO博客，原文链接：http://blog.51cto.com/yuhongchun/1676639，如需转载请自行联系原作者
