a:把之前安装了mysql-community数?库先删除掉!

         #rpm -qa | grep mysql

         #yum remove mysql*

         #rm -rf /var/lib/mysql

    b:执行命令安装mariadb

         #yum install mariadb mariadb-server -y

    c:安装好之后设置启动

         #systemctl start mariadb.service

         #systemctl enable mariadb.service   #注意在执行开机自启动时出错是因为没有设置密码

    d:刚刚安装的mariadb是没有密码的

    e:设置密码

         MariaDB[(none)]>update mysql.user set password=password(‘密码’) where user=”root”;

         MariaDB[(none)]>flush privileges;

    f:修改密码之后在来执行让mariadb开机自启动就不会出错了

         #systemctl enable mariadb.service