SessionHandler error on website after moving from 12 to 12.5

[Chris1]

I've got a particular website having a problem after moving it to a new server.

Plesk 12.5.30 - Update #3
CloudLinux 7.1

It is a Concrete5 website with showing the following two errors when trying to load the page:

SessionHandler::read(): open(/var/lib/php/session/sess_4kpe2r73aujdmo7duoun5o2rh6, O_RDWR) failed: No such file or directory (2)

SessionHandler::write(): open(/var/lib/php/session/sess_4kpe2r73aujdmo7duoun5o2rh6, O_RDWR) failed: No such file or directory (2)

I tried this http://kb.odin.com/en/115704 but it didn't help. I also tried the following as per someones recommendation in this thread https://talk.plesk.com/threads/issues-with-var-lib-php-session-after-plesk-update.282891/:

chown apache:psacln /var/lib/php/session
chmod -R 770 /var/lib/php/session

I've also tried re-migrating the site, rebuilding the domains configuration and different PHP versions.

There are other Concrete5 sites on this server working ok.

Any ideas?

 

[Chris1]

I disabled cagefs and the website could now load ok. Any ideas on how to resolve this?

Update:

I think I understand. Due to the user being in cagefs they have their own virtual file system as /var/lib/php/session doesn't exist to the user.

I could update my service plans to use "/tmp" as the session save path as that folder exists in the cagefs system. I believe this is the same folder CloudLinux use for their PHP's, although I'm using Plesk PHP versions.

I tested this and I now see a session file in the following directory:

/var/www/vhosts/example.com/.cagefs/tmp/

Is the way to go?

 

[Chris1]

***Solution from CloudLinux***

I submitted a ticket to CloudLinux and got a response within 5 mins!

add line @/var/lib/php/session,777 to /etc/cagefs/cagefs.mp and run $ cagefsctl --remount-all

This fixes the issue, my customer can now write/read to this file.