PHP FPM service failed for domain

[Chris1]

Hello,

We have a client that started receiving a "503 Service Unavailable" error on their website. After taking a look at the logs I found the following.

/var/log/plesk-php56-fpm/error.log

[25-May-2016 03:37:15] NOTICE: Terminating ...
[25-May-2016 03:37:15] NOTICE: exiting, bye-bye!

/var/www/vhosts/example.com/logs/error_log

[Wed May 25 03:37:27.279428 2016] [proxy:error] [pid 10551:tid 139733187417856] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/www/vhosts/system/example.com/php-fpm.sock (*) failed

This entry kept repeating hours. I ended up re-syncing them to a service plan, the problem then went away and the website became available.

I'm not sure if these two log entries are related but they happened very close to each other. What could cause the plesk-php56-fpm error log to give the above output?

 

[IgorG]

Is it VPS or standalone server?

 

[Chris1]

Hi @IgorG

It is a VPS.

 

[IgorG]

It is a VPS.

In this case, lack of resources can be there. Kernel OOM killer may terminate most voracious processes.

 

[Chris1]

Hmmm I don't think one can conclude that just because the server is a VPS that it is due to a lack of resources.

In this specific case there are no resource related issues either at the node, VPS or user level.