php-fpm.conf

php-fpm.conf

php-fpm.conf changes are global to all projects, but will only affect the currently selected PHP version.

General

You can set custom php-fpm.conf configuration options for each PHP version separately. These changes affect the PHP-FPM process itself, global as well as pool specific configuration can be set.

[!NOTE] The default PHP-FPM pool is called www in case you want to make changes to it.

See the directory structure for PHP-FPM configuration directories inside ./cfg/ directory:

host> ls -l path/to/devilbox/cfg/ | grep 'php-fpm'

drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-5.2/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-5.3/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-5.4/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-5.5/
drwxr-xr-x  2 cytopia cytopia 4096 Apr  3 22:04 php-fpm-5.6/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-7.0/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-7.1/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-7.2/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-7.3/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-7.4/
drwxr-xr-x  2 cytopia cytopia 4096 Mar  5 21:53 php-fpm-8.0/

Customization is achieved by placing a file into cfg/php-fpm-X.X/ (where X.X stands for your PHP version). The file must end by .conf in order to be sourced by the PHP-FPM server.

Each of the PHP-FPM conf configuration directories already contains three example file: devilbox-fpm.conf-default, devilbox-fpm.conf-pm_dynamic and devilbox-fpm.conf-pm_ondemand.

devilbox-fpm.conf-default

This file holds the exact settings that are currently in place by each PHP-FPM container. Copy it (do not simply rename it) to a different file ending by .conf and start adjusting it.

devilbox-fpm.conf-pm_dynamic

This file holds some sane example configuration to switch PHP-FPM scheduler to dynamic (The default is ondemand). Copy it (do not simply rename it) to a different file ending by .conf and start adjusting it.

devilbox-fpm.conf-pm_ondemand

This file holds the current default values for the PHP-FPM scheduler which is using ondemand. Copy it (do not simply rename it) to a different file ending by .conf and start adjusting it.

How to apply the settings

In order for the changes to be applied, you will have to restart the Devilbox.

To find out about all available PHP-FPM directives, global or pool specific have a look at its documentation: https://secure.php.net/manual/en/install.fpm.configuration.php

Examples

Change rlimit core for master process for PHP 7.1

The following examples shows you how to change the rlimit_core of PHP-FPM 7.1 master process to 100.

# Navigate to the Devilbox directory
host> cd path/to/devilbox

# Navigate to PHP 7.1 config directory
host> cd cfg/php-fpm-7.1

# Create new conf file
host> touch rlimit.conf

Now add the following content to the file:

[global]
rlimit_core = 100

[!IMPORTANT] Note the [global] section.

In order to apply the changes you need to restart the Devilbox.

Change child process on pool www for PHP 5.6

The following examples shows you how to change the pm, pm.max_children, pm.start_servers, pm.min_spare_servers and pm.max_spare_servers of PHP-FPM 5.6 on pool www.

# Navigate to the Devilbox directory
host> cd path/to/devilbox

# Navigate to PHP 5.6 config directory
host> cd cfg/php-fpm-5.6

# Create new conf file
host> touch www_server.conf

Now add the following content to the file:

[www]
; Pool config
pm = dynamic
pm.max_children = 10
pm.start_servers = 3
pm.min_spare_servers = 2
pm.max_spare_servers = 5

[!IMPORTANT] Note the [www] section.

In order to apply the changes you need to restart the Devilbox.

Set non-overwritable php.ini values for PHP 7.0

You can also set php.ini values that cannot be overwritten by php.ini or the ini_set() function of PHP. This might be useful to make sure a specific value is enforced and will not be changed by some PHP frameworks on-the-fly.

This is achieved by php-admin-flag and php-admin-value that are parsed directly to PHP-FPM.

https://secure.php.net/manual/en/install.fpm.configuration.php

The following example will disable built-in PHP functions globally and non-overwriteable for PHP 7.0.

# Navigate to the Devilbox directory
host> cd path/to/devilbox

# Navigate to PHP 7.0 config directory
host> cd cfg/php-fpm-7.0

# Create new conf file
host> touch admin.conf

Now add the following content to the file:

[www]
php_admin_value[disable_functions] = link,symlink,popen,exec,system,shell_exec

[!IMPORTANT] Note the [www] section.

[!IMPORTANT] This kind of setting only has affects PHP files served through PHP-FPM, when you run php on the command line, this setting will be ignored.

[!IMPORTANT] Be aware that none of your projects can use the above disabled functions anymore. They will simply not exist for PHP 7.0 after that configuration took affect.

In order to apply the changes you need to restart the Devilbox.