Plesk Debian 8 General error: 23 Out of resources when opening

On a Debian 8 server with Plesk control panel, on the Plesk login page, I got the following error message

Plesk Out of resources when opening

This error is due to MySQL open_files_limit value is set low. To verify, run the command

MySQL settings open_files_limit

You need to increase the limit.

On Debian 8, edit the file

Find

Add below

Restart MySQL

If you have other version of Operating System, see MariaDB Change Open Files Limit.

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