nagios check cpu used sub

Hướng dẫn sử dụng Nagios check CPU used

Võ Minh Bảo Hiếu Kiến Thức Server, Server Debian
Nội Dung

Nagios check CPU used?

Nagios check CPU used là việc sử dụng một file script để kiểm tra tình trạng hoat động của CPU trên server. Qua đó sẽ cho ta biết các thông tin về số CPU đã sử dụng. Kiểm tra CPU trên server cũng là một việc quan trọng, giúp server hoạt động ổn định và trơn tru.

Bài viết trước mình đã hướng dẫn các bạn cách kiểm tra memory used. Bài viết này sẽ tiếp tục hướng dẫn các bạn cách sử dụng Nagios check CPU used.

Hướng dẫn thực hiện.

1. Trên server cần kiểm tra CPU.

Bạn tải file check_cpu_usage.sh tại đây và bỏ vào thư mục /usr/local/nagios/libexec/

Hoặc bạn có thể tạo file check_cpu_usage.sh trong thư mục /usr/local/nagios/libexec/ và thêm vào nội dung sau:

#!/bin/sh
# Version 0.2
#
# ### History ###
# V0.1 Created script from CPU Idle script
# V0.2 Handle dicimal compare and output
if [ "$1" = "-w" ] && [ "$2" -gt "0" ] && [ "$3" = "-c" ] && [ "$4" -gt "0" ] ; then
warn=$2
crit=$4
IDLE=`top -b -n2|grep Cpu|tail -1|cut -d',' -f4|cut -d% -f1`
USAGE=`echo "100 - $IDLE"|bc|sed -r 's/^\./0./g'` ||exit 3
# echo "DEBUG: head: ${USAGE%%.*} tail: ${USAGE##*.} "
# echo "DEBUG: ||$USAGE_RAW|| , ||$USAGE||"
if [ $warn -lt ${USAGE%%.*} ];then
if [ $crit -lt ${USAGE%%.*} ]; then
echo "CRITICAL - CPU Usage = $USAGE %|CPU Usage=$USAGE%;;;;"
exit 2
else
echo "WARNING - CPU Usage = $USAGE %|CPU Usage=$USAGE%;;;;"
exit 1
fi
else
echo "OK - CPU Usage = $USAGE %|CPU Usage=$USAGE%;;;;"
exit 0
fi
else
echo "$0 - Nagios Plugin for checking CPU Usage in percentage "
echo ""
echo "Usage: $0 -w <warnlevel> -c <critlevel>"
echo " = warnlevel and critlevel is warning and critical value for alerts. "
echo ""
echo "EXAMPLE: /usr/lib64/nagios/plugins/$0 -w 80 -c 90 "
echo " = This will send warning alert when CPU Usage percentage is higher than 80%, and send critical when higher than 90%"
echo ""
exit 3
fi

Chỉnh sữa file nrpe.cfg.

Tìm đến file usr/local/nagios/etc/nrpe.cfg

Bên dưới dòng # The following examples use hardcoded command arguments… 

Bạn thêm nội dung sau:

command[check_cpu]=/usr/local/nagios/libexec/check_cpu_usage.sh -w 90 -c 95

Chú thích:

[check_cpu] là tên mình sẽ gọi trên Nagios Monitoring Server.
check_cpu_usage.sh là tên file script mình tạo.
-w 90 là nagios sẽ đưa ra cảnh báo warning khi lượng CPU sử dụng trên 90%.
-c 95 là nagios sẽ đưa ra cảnh báo critical khi lượng CPU sử dụng trên 95%.

2. Cài đặt trên Nagios Monitoring Server.

Chỉnh sữa file service.cfg nằm trong usr/local/nagios/etc/service.cfg

Thêm vào nội dung sau:

define service {
use                     generic-service
host_name               codegiday
service_description     Check CPU
check_command                 check_nrpe!check_cpu
notifications_enabled          1
}

Restart service Nagios.

service nagios restart

Kiểm tra hoạt động.

http://ip-server-nagios/nagios

Kết luận:

Mình vừa giới thiệu đến các bạn cách kiểm tra CPU sử dụng vào Nagios Monitoring Server. Các bạn có thắc mắc gì có thể để lại comment chia sẽ bên dưới. Nếu bài viết có nhiều sai sót xin các bạn góp ý
Cảm ơn các bạn theo dõi.

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