MySQL 卸载
rpm -qa | grep -i mysql
yum remove mysql-community mysql-community-server mysql-community-libs mysql-community-common
yum remove mysql57-community-release
再次检测是否卸载完成
rpm -qa | grep -i mysql
yum remove mysql-community mysql-community-server mysql-community-libs mysql-community-common
yum remove mysql57-community-release
再次检测是否卸载完成