Website becomes unavailable after switching to FPM application served by Apache

Started by mahesh, Dec 02, 2024, 07:39 AM

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mahesh

Symptoms
  • Website becomes unavailable after switching to FPM application served by Apache
  • When the PHP version to another one and then back to the initial PHP version the website works again
  • In the corresponding /var/log/plesk-phpXX-fpm/error.log the following errors appear despite the fact that the service is running and the website is accessible:

ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock
ERROR: Another FPM instance seems to already listen on /var/www/vhosts/system/example.com/php-fpm.sock

Cause
The php-fpm.sock file of the affected domain is corrupted

Resolution
  • Delete the php-fpm.sock file, it will be recreated automatically:
  • Connect to the server via SSH

Execute the following command:

#rm -rf /var/www/vhosts/system/example.com/php-fpm.sock