https://blog.csdn.net/tongxin_tongmeng/article/details/128263398

service mysql stop

chkconfig --del mysql

rm -rf /opt/mysql

rm -f /etc/my.cnf

rm -f /etc/init.d/mysql

userdel mysql && groupdel mysql

sed -i '/export MYSQL_HOME=\/opt\/mysql\/basedir/d' /etc/profile
sed -i '/export PATH=\$PATH:\$MYSQL_HOME\/bin/d' /etc/profile
source /etc/profile

firewall-cmd --zone=public --remove-port=3306/tcp --permanent && firewall-cmd --reload

yum remove mysql

rpm -e --nodeps `rpm -qa | grep -i mysql` && rm -rf /var/lib/mysql /etc/my.cnf.rpmsave /var/log/mysqld.log

find / -name 'mysql' -exec rm -rf {} \;