删除mysql的/var/lib/mysql目录下的所有文件
https://blog.csdn.net/tr1912/article/details/81271851
# mysqld --initialize --user=mysql
[root@localhost cyx]# cp /etc/my.cnf /etc/my.cnf.bak
[root@localhost cyx]# vim /etc/my.cnf
[root@localhost cyx]# cd /var/lib/mysql
/var/lib/mysql
# mv mysql mysql-bak-cyx
[root@localhost lib]# mysqld --initialize --user=mysql
[root@localhost lib]# systemctl status mysqld