1.同事跑了一个php的抓取, 这个会导致非常高的sleep值,大概到好几千的水平.进而mysql会down掉.

写了个crontab

#crontab -e

[php]

* */1 * * * /sh/detect_php.sh

* */1 * * * /sh/detect_php.sh

detech_php 的内容

[php]

#!/bin/bash

host_dir=`cd /sh`

proc_name="mysql"

bug_time=`date -R`

pid=0

proc_num()

{

num=`ps -ef | grep $proc_name | grep -v grep | wc -l`

return $num

}

proc_id()

{

pid=`ps -ef | grep $proc_name | grep -v grep | awk '{print $2}'`

}

proc_num

number=$?

if [ $number -eq 0 ]

then

./restart_php_mysql.sh

proc_id

echo " Kill the php and new mysql pid is : ${pid} : ${bug_time} " >> php_mysql.log 2>&1

else

proc_id

echo " The mysql is working , ${bug_time} " >> php_mysql.log 2>&1

echo "it's ok!"

fi

#!/bin/bash

host_dir=`cd /sh`

proc_name="mysql"

bug_time=`date -R`

pid=0

proc_num()

{

num=`ps -ef | grep $proc_name | grep -v grep | wc -l`

return $num

}

proc_id()

{

pid=`ps -ef | grep $proc_name | grep -v grep | awk '{print $2}'`

}

proc_num

number=$?

if [ $number -eq 0 ]

then

./restart_php_mysql.sh

proc_id

echo " Kill the php and new mysql pid is : ${pid} : ${bug_time} " >> php_mysql.log 2>&1

else

proc_id

echo " The mysql is working , ${bug_time} " >> php_mysql.log 2>&1

echo "it's ok!"

fi

脚本解释,这个脚本非常简单的. 就是判断mysql进程是否为0, 如果为0,那么就去杀掉php,然后重启mysql.并且写入一个日志.

restart_php_mysql.sh 的内容

[php]

#!/bin/sh

killall -9 php

service mysql restart

#!/bin/sh

killall -9 php

service mysql restart

pkill会导致脚本在杀完进程后直接terminated. 所以这里不使用pkill.

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