Avoid PHP-FPM memory leaks leading to memory exhaustion

For PHP-FPM multi-process mode, it is simple to avoid a memory leak, which is to allow php-cgi to exit after processing a certain number of processes.
Otherwise, a memory leak caused by a PHP program or a third-party module, such as a imagemagick extension, can result in memory exhaustion or inadequacy.
Php-fpm.conf in the relevant configuration:
#请自行按需求配置

Pm.max_requests = 1024

There is actually another value associated with it, Max_children, which is how many processes are established each time php-fpm, so that the actual memory consumption is max_children*max_requests* each request uses memory.

Other rough methods include setting up a cron kill that consumes too much memory, php-cgi

1. Check the memory consumption of the PHP process, kill the memory using the excess process

In general, if the php-cgi process takes up more than 1% of the memory, consider whether or not to kill it. As a general rule, the php-cgi process typically consumes 0.2% or less.

Here is a script for you to use, that is, in a cron task, executed every minute.

Use the CRONTAB-E command, and then add the following dispatch task

* * * * * */bin/bash/usr/local/script/kill_php_cgi.sh

The kill_php_cgi.sh script is as follows

#!/bin/sh
#如果是要杀掉php-FPM Process, the following statement php-cgi please change to PHP-FPM
pids= ' Ps-ef|grep php-cgi|grep-v "grep" |grep-v "$" | awk ' {print $} '
If ["$pids"! = ""];then
for PID in $pids;
Do
Kill-9 $pid
Done

Fi

2. Add memory and set the value of Php_fcgi_max_requests to the value that corresponds to your total memory storage

3. Optimize the program to reduce the amount of memory consumed per request

If PHP-FPM can provide configuration child process memory more than the specified size will be killed, then it is much more convenient.

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Avoid PHP-FPM memory leaks leading to memory exhaustion