Install MariaDB

CentOS 7 have MariaDB 5 native support. Just use this command.

$ yum install mariadb-server

If you need MariaDB 10. Setup repositories at this website https://downloads.mariadb.org/mariadb/repositories/#mirror=ut-austin

Next, init database.

$ systemctl start mariadb
$ mysql_secure_installation

The database gonna work.