1、首先需要检查MySQL的状态
systemctl status mysqld
2、关闭MySQL服务并设置开机不自启
systemctl stop mysqld
systemctl disable mysqld
3、搜索相关配置文件并删除
find / -name mysql
rm -rf /etc/selinux/targeted/active/modules/100/mysql /usr/lib64/mysql /usr/local/mysql /var/lib/mysql
# 以下删除的内容,如果存在的话,删除
rm -rf /etc/my.cnf*
rm -rf /etc/init.d/mysqld
4、删除mysql用户
id mysql
userdel mysql