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What should I do if the cpu is 100% due to php reasons?

藏色散人
藏色散人Original
2022-11-13 10:15:034431browse

php原因导致cpu100%的解决办法:1、找出CPU使用率高的进程PID;2、跟踪进程并修改有可疑的PHP代码;3、配置“PHP-CGI”的进程数;4、通过监控与自动恢复的脚本保证服务的正常运转即可。

What should I do if the cpu is 100% due to php reasons?

本教程操作环境:windows7系统、PHP8.1版、Dell G3电脑。

php原因导致cpu100%怎么办?

PHP-FPM进程CPU 100%的原因及解决方案

近有服务器不时出现的CPU使用率超高,内存几乎被吃光,系统甚至自动kill掉一些进程,如sshd,vsftpd等。用top查看,PHP-CGI进程高挂不下,如下是解决方案:

一、进程跟踪

# top //找出CPU使用率高的进程PID
# strace -p PID //跟踪进程
# ll /proc/PID/fd //查看该进程在处理哪些文件

将有可疑的PHP代码修改之,如:file_get_contents没有设置超时时间。

二、内存分配

如果进程跟踪无法找到问题所在,再从系统方面找原因,会不会有可能内存不够用?据说一个较为干净的PHP-CGI打开大概20M-30M左右的内存,决定于PHP模块开启多少。

通过pmap指令查看PHP-CGI进程的内存使用情况

# pmap $(pgrep php-cgi |head -1)

按输出的结果,结合系统的内存大小,配置PHP-CGI的进程数(max_children)。

三、监控

最后,还可以通过监控与自动恢复的脚本保证服务的正常运转。下面是我用到的一些脚本:

只要一个php-cgi进程占用的内存超过 %1 就把它kill掉

#!/bin/sh
PIDS=`ps aux|grep php-cgi|grep -v grep|awk’{if($4>=1)print $2}’`
for PID in $PIDS
do
echo `date +%F….%T`>>/data/logs/phpkill.log
echo $PID >> /data/logs/phpkill.log
kill -9 $PID
done

检测php-fpm进程

#!/bin/bash
netstat -tnlp | grep “php-cgi” >> /dev/null #2&> /data/logs/php_fasle.log
if [ "$?" -eq "1" ];then #&& [ `netstat -tnlp | grep 9000 | awk '{ print $4}' | awk -F ":" '{print $2}'` -eq "1" ];then
/usr/local/webserver/php/sbin/php-fpm start
echo `date +%F….%T` “System memory OOM.Kill php-cgi. php-fpm service start. ” >> /data/logs/php_monitor.log
fi

通过http检测php执行

#!/bin/bash
status=`curl -s –head “http://127.0.0.1:8080/chk.php” | awk ‘/HTTP/ {print $2}’`
if [ $status != "200" -a $status != "304" ]; then
/usr/local/webserver/php/sbin/php-fpm restart
echo `date +%F….%T` “php-fpm service restart” >> /data/logs/php_monitor.log
fi

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