Plesk is not accessible after switching from MySQL to MariaDB: "Unable to connect to database: No such file or directory /var/lib/mysql/mysql.sock"

Updated August 19, 2018 18:37

Applicable to:

There was an attempt to switch a database server from MySQL to MariaDB.
Plesk is not accessible after this procedure. The following error message is shown in a browser:

PLESK_INFO: Unable to connect to database: mysql_connect(): No such file or directory /var/lib/mysql/mysql.sock (Error code: 2002). Please check that database server is started and accessible. (Abstract.php:69)
MySQL cannot be started:

# service mysql start
mysql: unrecognized service

Switching from MySQL to MariaDB procedure was performed incorrectly.

Review the procedure described in the following KB article:

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