As most distributions have moved to systemd, here's an example startup script that you may customize for your installation.
This has been tested to work on CentOS 7.
From there you can enable it so it starts automatically
Note that on Debian 8.1, you need to use After=mysql.service, not After=mariadb.service.
And then start it yourself if you haven't already
You can check the output of the startup with the 'systemctl status' command