How to restart PHP-FPM at VestaCP – If you edit the PHP configuration then to apply it to the process itself needs to be restarted. This is easy if use PHP-FPM machine. That is so difficult that if you already use the arrangement the hosting panel standards such as no VestaCP.
If you want to know how to restart the engine of PHP-FPM used VestaCP and because passing Panel itself is not possible due to error then it could be via SSH here.
OK, good luck.
Just a little note, avoid manually editing the config file used like VestaCP web hosting panel, Webuzo, Kloxo, etc. If not forced to. At least make a backup first, so if something can be directly restored.