Precautions for php-fpm parameter configuration of php7+

This article mainly introduces the precautions for php-fpm parameter configuration of php7. It has certain reference value. Now I share it with you. Friends in need can refer to it.

Installation of php7, if Improper setting of these parameters of php-fpm will cause php-fpm to fail to start, the nginx site cannot parse the php file, and a 404 error will be reported.

Related commands:
centos7, start php-fpm:

systemctl start php-fpm

Check whether php-fpm is started:

ps -ef|grep php

The core parameter configuration of php-fpm, the default is as follows :

pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3

Only for dynamic mode, the dynamic description is as follows:
max_children: Limit the maximum number of php-fpm processes in dynamic mode
start_servers: The starting number of php-fpm processes in dynamic mode
min_spare_servers: The minimum number of php-fpm processes in the dynamic idle state
max_spare_servers: The maximum number of php-fpm processes in the dynamic idle state

If you pay attention to changing the wrong parameters, these parameters will cause php- fpm cannot be started, and nginx cannot access the php file. You can check the log to troubleshoot errors:
/usr/local/php/var/log/php-fpm.log

Rule summary:

1. max_children must be greater than min_spare_servers

2. max_children must be greater than max_spare_servers

3. start_servers must be greater than min_spare_servers

4. start_servers = min_spare_servers (max_spare_servers - min_spare_servers) / 2

PS: My server has 8G memory, and there is still a lot of free space at the moment, so I added a 0 after it. They are 50, 20, 10, and 30 respectively.

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