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After enabling PHP-FPM (PHP-FastCGI Process Manager) on your VPS, you'll need to know how to restart the PHP-FPM service and modify its settings. Below we cover how to adjust PHP-FPM settings according to traffic load per cPanel account.

  1. Login WHM as Root.
  2. From the menu, search and select MulitiPHPManager.
  3. Enable PHP-FPM
    Select Turn on to enable PHP-FPM for all cPanel accounts. Alternatively, you can select the checkbox beside specific domains at the bottom, choose On from the dropdown menu beside PHP-FPM, and select Apply.
    You can also change the PHP version here instead of in cPanel.
  4. Select Pool Options beside the specified domain.
  5. Edit PHP-FPM settings
    Modify PHP-FPM settings for the domain. Below are commonly successful changes according to amount of traffic your VPS receives.
    Traffic Load Average Heavy
    Max Children 200 500
    Process Idle Timeout 100 150
    Max Requests 300 2000

Edit Default PHP-FPM Settings

If you have many cPanel accounts, you may prefer to change the default settings for newly created cPanel accounts.

  1. As root, SSH into your server or launch WHM terminal.
  2. Create a system_pool_defaults.yaml file in the /var/cpanel/ApachePHPFPM directory. To do this using nano, type the following:

    nano /var/cpanel/ApachePHPFPM/system_pool_defaults.yaml

    Add the following to the new file:

    php_value_error_reporting: 'E_ALL'
    pm_max_children: 500
    pm_max_requests: 2000
    pm_min_spare_servers: 1
    pm_max_spare_servers: 25
    pm_process_idle_timeout: 150
    php_value_disable_functions: 0

    pm_max_children: Max number of child processes
    pm_max_requests: Number of requests a child process executes before respawning.
    pm_min_spare_servers: Minimum idle server processes
    pm_max_spare_servers: Maximum idle server processes
    pm_process_idle_timeout: Time until an idle process is killed in s(econds), m(inutes), m(inutes), h(ours), or d(ays).
    php_value_disable_functions: Functions to disable. This doesn't overwrite php.ini settings.
  3. Save and exit the file. Using nano, press Control and x for the save prompt before exiting. Press y, then Enter ⤶ to save the file.
  4. Rebuild PHP-FPM using the following command:

    /scripts/php_fpm_config --rebuild

  5. Restart PHP-FPM using the following command:


    Note:You can also restart PHP-FPM from WHM.

These adjustments should help you make the most out of your VPS optimization. You can learn more configuration options for PHP-FPM with official cPanel documentation. You can read more about the benefits of PHP-FPM in our in-depth article.

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