mysql root 忘记密码

1．修改 /etc/my.cnf 
在[mysqld]下面加上一句：
skip-grant-tables 

2．重启mysqld 

/etc/init.d/mysqld restart 

3．登录并修改MySQL的root密码 
mysql

USE mysql; 
UPDATE user SET Password = password ( 'newpassword' ) WHERE User = 'root' ; 

4．从/etc/my.cnf 移除skip-grant-tables 配置 
5．重启mysqld 
/etc/init.d/mysqld restart