卸载MySQL

查出mysql的安装包

rpm -qa | grep mysql

删除上面查出的安装包

rpm -e --nodeps mysql-community-libs-5.7.22-1.el7.x86_64 mysql57-community-release-el7-11.noarch mysql-community-common-5.7.22-1.el7.x86_64 mysql-community-client-5.7.22-1.el7.x86_64 mysql-community-libs-compat-5.7.22-1.el7.x86_64 mysql-community-server-5.7.22-1.el7.x86_64

删除残留文件

cd /var/lib

rm -rf mysql