To start MariaDB on Fedora 20, execute the following command:

systemctl start mariadb.service

To autostart MariaDB on Fedora 20, execute the following command:

systemctl enable mariadb.service

After you started MariaDB (do this only once), execute the following command:

/usr/bin/mysql_secure_installation

转自： http://serverfault.com/questions/626922/no-mysqld-or-mysql-server-after-mariadb-server-install