Reasons and solutions for errors when starting php-fpm under nginx

The content of this article is to share with you the reasons and solutions for errors when starting php-fpm under nginx. It has certain reference value. If necessary, Friends can refer to it

1. Background

Today’s server reported a 502 error several times, possibly due to the script I wrote. There are too many, plus a series of problems such as third-party plug-ins used, response timeouts, etc. I encountered many php-fpm errors here. Record it.

2. Error message

1. value is NULL for a ZEND_INI_PARSER_ENTRY

##Cause:

When restarting php-fpm, the system prompts an error. You need to enter "systemctl status php5-fpm.service" to view the error message.

ERROR: [/usr/local/php5/etc/php-fpm.conf:144] value is NULL for a ZEND_INI_PARSER_ENTRY

Solution:

The reason for this error is that when we wrote the php-fpm.conf file, we may have written it incorrectly or not in a standard way. Just caused it. Here you can check which line caused the error:

//看好这个144，这就是你报错的地方
ERROR: [/usr/local/php5/etc/php-fpm.conf:144]

Just modify the error message.

2. pm.start_servers(3) must not be less than pm.min_spare_servers(1) and not greater than pm.max_spare_servers(1)

Reason:

For this error, please refer to: PHP official documentation

The size of some parameters was ignored when configuring the file.

Solution:

pm.max_children int
pm 设置为 static 时表示创建的子进程的数量，pm 设置为 dynamic 时表示最大可创建的子进程的数量。必须设置。

该选项设置可以同时提供服务的请求数限制。类似 Apache 的 mpm_prefork 中 MaxClients 的设置和 普通PHP FastCGI中的 PHP_FCGI_CHILDREN 环境变量。

pm.start_servers in设置启动时创建的子进程数目。仅在 pm 设置为 dynamic 时使用。默认值：min_spare_servers + (max_spare_servers - min_spare_servers) / 2。

pm.min_spare_servers int
设置空闲服务进程的最低数目。仅在 pm 设置为 dynamic 时使用。必须设置。

pm.max_spare_servers int
设置空闲服务进程的最大数目。仅在 pm 设置为 dynamic 时使用。必须设置。

The rules of setting these parameters:

min_spare_servers ≤ start_servers ≤ max_spare_servers ≤ max_children

3. Error when starting php-fpm: cannot get uid for user 'www_data'

Cause:

This error is a startup user error. The configuration file defaults to the user "www_data", but this means that it should be started with the current user. Because I am currently using the "pzsh" user, I can just modify it.

Solution:

1. Enter the php-fpm.conf file

2. Find user = www-data and modify it to: user = pzsh
The corresponding user group group has also been modified to: group = pzsh

The above is the problem encountered recently when restarting php-fpm. In fact, many error messages have been prompted to us by the server, just read English.

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