Changes to the PHP settings when using LiteSpeed Web Server and FastCGI application are not applied immediately

Symptoms

• Plesk is running with an active LiteSpeed Web Server installed with the LiteSpeed extension.

• The FastCGI PHP handler is set up at Domains > example.com > PHP Settings.

• The PHP information page Domains > example.com > PHP Settings > View the phpinfo() displays the PHP version and/or PHP parameters different from the values at Domains > example.com > PHP Settings.

Cause

For LiteSpeed Web Server v5.3 and newer, the PHP Detached Mode was introduced (which is now the default one) - when it's active the new configuration may be applied with a delay.
A new configuration only takes effect once the lsphp is restarted.

Resolution

Use one of the following options:

• Wait for the lsphp process to time out and fork again.

• Restart the PHP Process:

  1. Log in to Plesk.

  2. Open Extensions > LiteSpeed.

  3. Click Restart Detached PHP Processes

     Note: the PHP handler will restart the next time it is requested by the server, so the configuration might not be updated immediately.

• Kill the PHP process:

  1. Connect to the server over SSH.

  2. Manually kill the processes and restart LSHTTPD:

     # killall -9 lsphp

     # systemctl restart lshttpd