Switching to mpm_event and HTTP/2 with php-fpm in Ubuntu

To use mpm_event and support HTTP/2, you should disable all versions of PHP that rely on mpm_prefork. Then, you can configure php-fpm for each version of PHP you want to use.

Steps

1. Disable all versions of PHP using mpm_prefork:

   Find out which PHP versions are active:

   apache2ctl -M | grep php

   Then disable them:

   sudo a2dismod php7.4
   sudo a2dismod php8.0
   sudo a2dismod php8.2

2. Disable mpm_prefork and enable mpm_event:

   Disable mpm_prefork:

   sudo a2dismod mpm_prefork

   Enable mpm_event:

   sudo a2enmod mpm_event

3. Enable php-fpm for each version:

   Install php-fpm for each version:

   sudo apt-get install php7.4-fpm
   sudo apt-get install php8.0-fpm
   sudo apt-get install php8.2-fpm

   Enable proxy_fcgi and setenvif:

   sudo a2enmod proxy_fcgi setenvif

   Enable php-fpm configurations:

   sudo a2enconf php7.4-fpm
   sudo a2enconf php8.0-fpm
   sudo a2enconf php8.2-fpm

4. Configure virtual hosts to use php-fpm:

   In each virtual host, replace SetHandler with:

   <FilesMatch \\.php$>
       SetHandler "proxy:unix:/run/php/php7.4-fpm.sock|fcgi://localhost/"
   </FilesMatch>

   Change php7.4 to the corresponding version for each host.

5. Restart Apache:

   sudo systemctl restart apache2

Conclusion

Now, your virtual hosts are configured to use php-fpm and support the HTTP/2 protocol.