执行完yum安装命令后发现竟然无法启动错误提示如下
[root@localhost ~]# systemctl start mysql.service
Failed to start mysql.service: Unit mysql.service not found.
查了半天资料，终于了解到MariaDB代替了mysql数据库
因此用上述命令启动不起来，正确的方法如下
# yum install mariadb -y //如果已安装可以省略
# systemctl start mariadb.service //启动服务
# systemctl enable mariadb.service //开机启动服务
# mysql -u root -p //登录mysql