CPU Utilization Plugin For Nagios v2.0 推荐

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。

#!/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

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：