# sudo cat > /etc/yum.repos.d/mariadb.repo << _EOL
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.3/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
_EOL
# sudo yum install MariaDB server MariaDB client