Move database location

[skrby]

I have MantisBT 2.26.0 installed (using 10.5.22-MariaDB) on a Linux server. It is working fine and have created a few issues in the database.
But now I want to move the database from the default location /var/lib/mysql to a different directory (/db).
Copied the database from /var/lib/mysql to /db
I have changed the path in /etc/my.cnf to:

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[client]
socket=/db/mysql-data/mysql.sock

and in /etc/my.cnf.d/mariadb-server.cnf

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[mysqld]
datadir=/db/mysql-data
socket=/db/mysql-data/mysql.sock

But when I restart the system and go to the webpage, I get the error:

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APPLICATION ERROR #400: Database connection failed. Error received from database was #2002: No such file or directory.

Any ideas what I am missing?

[cas]

That is a MySql/MariaDB issue, check on their forums.