一、关闭MySQL
[root@localhost /]# service mysqld stop Redirecting to /bin/systemctl stop mysqld.service 二、查看当前安装mysql情况，查找以前是否装有mysql
[root@localhost /]# rpm -qa|grep -i mysql python2-mysqlclient-1.3.12-7.ky10.x86_64 perl-DBD-MySQL-4.046-6.ky10.x86_64 qt5-qtbase-mysql-5.11.1-9.ky10.x86_64 三、执行命令删除安装的MySQL
[root@localhost /]# rpm -ev python2-mysqlclient-1.3.12-7.ky10.x86_64 rpm -ev perl-DBD-MySQL-4.046-6.ky10.x86_64 --nodeps rpm -ev qt5-qtbase-mysql-5.11.1-9.ky10.x86_64 --nodeps 报错：
error: Failed dependencies: mysql-community-client(x86-64) >= 8.0.0 is needed by (installed) mysql-community-server-8.0.13-1.el7.x86_64
原因是依赖包错误，再执行以下命令解决：
[root@localhost /]# rpm -ev mysql-community-client-8.0.13-1.el7.x86_64 --nodeps 剩余几个也按照上述操作执行，加上 --nodeps
再执行 # rpm -qa|grep -i mysql 命令，查看是否删除成功。
四：查看之前安装的MySQL的目录并删除
[root@localhost /]# find / -name mysql /var/lib/selinux/targeted/active/modules/100/mysql /var/lib/selinux/ukmcs/active/modules/100/mysql /var/lib/mysql /usr/bin/mysql /usr/share/bash-completion/completions/mysql /usr/share/selinux/targeted/default/active/modules/100/mysql /usr/share/selinux/ukmcs/default/active/modules/100/mysql
[root@localhost /]# rm -rf /var/lib/selinux/targeted/active/modules/100/mysql [root@localhost /]# rm -rf /var/lib/selinux/ukmcs/active/modules/100/mysql [root@localhost /]# rm -rf /var/lib/mysql [root@localhost /]# rm -rf /usr/bin/mysql [root@localhost /]# rm -rf /usr/share/bash-completion/completions/mysql [root@localhost /]# rm -rf /usr/share/selinux/targeted/default/active/modules/100/mysql [root@localhost /]# rm -rf /usr/share/selinux/ukmcs/default/active/modules/100/mysql
五：删除my.cnf
卸载后/etc/my.cnf不会删除，需要进行手工删除
[root@localhost /]# rm -rf /etc/my.cnf 最后查看一下是否卸载完毕，无结果说明卸载完成。
[root@localhost /]# rpm -qa|grep -i mysql
