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This document explains the PHP-FPM code, its filesystem layout, how the system implements PHP-FPM, and how to restore your PHP to your system.
What does PHP-FPM do?
PHP FastCGI Process Manager (PHP-FPM) is an alternative FastCGI daemon for PHP that allows a website to handle strenuous loads. It also allows for a host to set specific amounts of resources to process a domain's requests. PHP-FPM maintains "pools" (workers available to respond to PHP requests) to accomplish this. These "pools" of workers allow the website to handle more requests than it normally could.
PHP-FPM is faster than traditional CGI-based methods, such as SUPHP, for multi-user PHP environments. It does not overload a system's memory with PHP from Apache processes like
ruid2+php-dso does. This method is useful when a user receives extra traffic that requires resources to process it. For example, your website may receive a spike in traffic after a TV show features it or is linked from a popular website.
You can examine your server, locate the source of the extra traffic, and then enable PHP-FPM on that site via the pool manager. PHP-FPM does this through a service to serve PHP requests that Apache routes traffic to. PHP-FPM only executes PHP requests, which enables it to service content quicker than other methods.
How does cPanel implement PHP-FPM?
Cpanel/PHPFPM.pm) module is the basis of EasyApache support with PHP-FPM. The module's built-in defaults generate configuration files that provide fully functional PHP-FPM pools for a domain.
The system uses the following configuration files:
The system does not require the presence of these files to run since the built-in defaults enable the PHP-FPM to run sufficiently. Within these files you include different directives from the built-in values.
Exercise extreme caution when you manually edit
.yaml files. Incorrect syntax in these files will cause services to fail. We strongly recommend that you create a backup of your system before you manually edit
Only include the differences in directives within these files.
The following shows an example of the
This only uses a different value than the built-in default for the
daemonize setting. The
system-pool-defaults.yaml file is similar but applies to each pool that you create. We create one pool for each domain in the system. Some fields use unacceptable characters such as "
.()" for internal reasons but will require you to amend or scrub them. If you find any of these characters, substitute them with an underscore.
|Old Name||New Name|
If you prepend any PHP settings with the with the
disable_classes flag, the system will append the new
php.ini value to the previous one in the user's
.htaccess files. For more information, read securephp.net's FastCGI Process Manager (FPM) documentation.
The filesystem configuration files
The system stores the configuration files that control PHP-FPM in the following files:
|This file contains the system configurations of PHP-FPM.|
|This file changes your domain to the domain setting of the website that you use. For example, the |
.yaml files within the
/var/cpanel directories generate these two files.
- Do not edit these configuration files manually.
- The system repeats these configuration files for each version that you select.
php54as its version.
- You must change
ea-php54to the version your system currently runs on. For example, if your system runs on PHP version 5.5 or 5.6, change
Use the following required files only if you wish to run PHP-FPM:
This file controls a specific domain's pool.
First, it uses the built-in default values, then the
Use the following optional files only if you wish to to change the default parameters:
This file contains system level settings.
The system also uses this file to generate the
The systems uses this file to generate each domain's pool.
For example, the
All domain pools use these defaults unless a
.yaml file overrides them.
Restore PHP to your system
cPanel & WHM cannot clean up configurations or other related files when you manually remove RPMs. If you manually remove RPMs, you could remove dependencies in which your hosted websites require.
We do not recommend that you perform
yum remove operations with any
ea-php RPMs. If you remove PHP from your system while any of your hosted websites still us it, those websites will display errors. In addition, Apache could fail to display the website entirely. Before you perform a
yum remove operation, confirm that none of your hosted websites use the PHP version that you wish to remove with WHM's MultiPHP Manager interface (Home >> Software >> MultiPHP Manager).
If you use
yum or the EasyApache 4 interface (Home >> Software >> EasyApache 4) to remove FPM packages, the system will revert you back to the current system default.
To restore PHP versions to your system, run the following two commands:
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