Plesk PHP FPM 7.0 service is down after switching to it from another FPM handler

Symptoms

• Plesk PHP FPM 7.0 service is down after switching website from another FPM handler to Plesk PHP FPM 7.0

• The following error is shown in
/var/log/plesk-php70-fpm/error.log


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

• File
/var/www/vhosts/system/example.com/php-fpm.sock
does not exist:

  # ls -la /var/www/vhosts/system/example.com/php-fpm.sock
  ls: cannot access /var/www/vhosts/system/example.com/php-fpm.sock: No such file or directory
  

• Systemd is installed and enabled.

• Error in Plesk UI:

  phpinimng failed: invoke-rc.d: initscript plesk-php70-fpm, action "status" failed. invoke-rc.d: initscript plesk-php70-fpm, action "status" failed. Service plesk-php70-fpm is down after attempt to start it
  

Cause

This is a software issue with internal ID #PPPM-4004 which is planned to be fixed in future Plesk updates.

Resolution

Until the fix becomes available, use the following workaround:

1. Connect to the server via SSH;

2. Create a custom systemd unit file with 3 sec timeout on restart using any text editor:

   For Debian-based systems:

   # cat /etc/systemd/system/plesk-php70-fpm.service
   .include /lib/systemd/system/plesk-php70-fpm.service
   [Service]
   Restart= on-failure
   RestartSec= 3

   For RHEL-based systems:

   # cat /etc/systemd/system/plesk-php70-fpm.service
   .include /usr/lib/systemd/system/plesk-php70-fpm.service
   [Service]
   Restart= on-failure
   RestartSec= 3