MySQLが入っている場合は削除
$ yum remove mysql
add repository
vi /etc/yum.repos.d/MariaDB.repo
# MariaDB 10.0 CentOS repository list - created 2014-03-12 12:47 UTC
# http://mariadb.org/mariadb/repositories/
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.1/centos6-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
install MariaDB
$ yum install MariaDB-server MariaDB-client MariaDB-devel
start MariaDB
$ service mysql start
$ mysql --version
mysql Ver 15.1 Distrib 10.1.4-MariaDB, for Linux (x86_64) using readline 5.1
start MariaDB on boot
$ chkconfig mysql on