CentOS下Web服务器CPU负载超过阀值自动重启shell脚本

定时监控服务器负载，超过一定阀值后，自动重启web服务。

apache安装目录：/usr/local/apache

脚本运行日志文件：/usr/local/apache/check_cpu_load.log

脚本存放目录：/home/crontab

cd /home/crontab

vi check_cpu_load.sh #编辑，添加以下代码

#!/bin/sh

#crontab: */5 * * * * /home/crontab/check_cpu_load.sh >> /usr/local/apache/check_cpu_load.log

TOP_SYS_LOAD_NUM=3

SYS_LOAD_NUM=`uptime | awk '{print $(NF-2)}' | sed 's/,//'`

echo $(date +"%y-%m-%d") `uptime`

if [ `echo "$TOP_SYS_LOAD_NUM < $SYS_LOAD_NUM"|bc` -eq 1 ]

then

echo "#0#" $(date +"%y-%m-%d %H:%M:%S") "pkill httpd" `ps -ef | grep httpd | wc -l` >> /usr/local/apache/check_cpu_load.log

/usr/local/apache/bin/apachectl stop

sleep 5

pkill httpd

sleep 5

for i in 1 2 3

do

if [ `pgrep httpd | wc -l` -le 0 ]

then

/usr/local/apache/bin/apachectl start

sleep 30

echo "#1#" $(date +"%y-%m-%d %H:%M:%S") "start httpd" `ps -ef | grep httpd | wc -l` >> /usr/local/apache/check_cpu_load.log

fi

done

else

if [ `pgrep httpd | wc -l` -le 0 ]

then

/usr/local/apache/bin/apachectl start

sleep 30

echo "#2#" $(date +"%y-%m-%d %H:%M:%S") "start httpd" `ps -ef | grep httpd | wc -l` >> /usr/local/apache/check_cpu_load.log

fi

fi

:wq! #保存退出

crontab -e #添加计划任务

*/5 * * * * /home/crontab/check_cpu_load.sh >> /usr/local/apache/check_cpu_load.log

:wq! #保存退出

service crond restart #重启计划任务

通过以上设置后，当服务器负载超过3时，在5分钟内会自动运行脚本，重启apache服务，使网站恢复访问
本文出自http://www.111cn.net/sys/CentOS/102450.htm