1、 卸载

rpm –qa | grep mariadb

yum remove mariadb

2、 删除遗留目录

ls /etc/my.cnf

ll /var/lib/mysql/

rm –rf /etc/my.cnf

rm –rf /var/lib/mysql/

3、 重新安装

yum install mariadb mariadb-server –y

systemctl start mariadb

systemctl enable mariadb

mysql_secure_installation

mysql –u root –p