MySQL忘记密码

1，修改MySQL的登录设置： 

# vim /etc/my.cnf 

在[mysqld]的段中加上一句：skip-grant-tables 
例如： 

[mysqld] 
datadir=/var/lib/mysql 
socket=/var/lib/mysql/mysql.sock 
skip-grant-tables 

保存并且退出

2，重新启动mysqld 

# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

3，登录并修改MySQL的root密码 

# mysql 
Welcome to the MySQL monitor. Commands end with ; or g. 
Your MySQL connection id is 3 to server version: 3.23.56 
Type 'help;' or 'h' for help. Type 'c' to clear the buffer. 
mysql> USE mysql ; 
Database changed 
mysql> UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ; 
Query OK, 0 rows affected (0.00 sec) 
Rows matched: 2 Changed: 0 Warnings: 0 
mysql> flush privileges ; 
Query OK, 0 rows affected (0.01 sec) 
mysql> quit

4，将MySQL的登录设置修改回来 

# vim /etc/my.cnf 

将刚才在[mysqld]的段中加上的skip-grant-tables删除 
保存并且退出

5，重新启动mysqld 

# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]