1.编辑my.cnf文件加入skip-grant-tables，忽略密码登录

[root@node1 ~]# vi /etc/my.cnf

[mysqld]

skip-grant-tables

[root@node1 ~]# sudo service mysql restart

2.修改密码

[root@node1 ~]# mysql
mysql> update mysql.user set authentication_string=PASSWORD('root1234') where user='root' and host='localhost';
mysql> flush privileges;
mysql> exit;

3.开启密码登录

[root@node1 ~]# vi /etc/my.cnf

[mysqld]

#skip-grant-tables

[root@node1 ~]# sudo service mysql restart

4.修复错误

[root@node1 ~]# mysql -uroot -proot1234;

[root@node1 ~]# mysql> show databases;

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'root1234'

Query OK, 0 rows affected (0.09 sec)