1.跳过mysql密码认证

vim /etc/my.cnf
#在[mysqld]后面任意一行添加“skip-grant-tables"跳过密码验证过程。

2.重启mysql

/etc/init.d/mysqld restart

3.进入到mysql并修改密码

[root@nuanfeng ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.1.73-log MySQL Community Server (GPL)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>
mysql> use mysql; 
mysql> update user set password=password('你的密码') where user='root' and host='localhost'; 
mysql> flush privileges; 

4.删除skip-grant-tables

5.重启数据库

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