1. 先结束mysql 进程

# killall mysqld

2. 用mysql 安全模式运行并跳过权限难

# mysqld_safe –skip-grant-tables

3. 用root 登录 ，此时不需要密码

# mysql -u root

4. 现在开始修改密码了

mysql> use mysql;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> update user set Password = PASSWORD(‘your new password’) where User = ‘root’ ;

Query OK, 2 rows affected (0.02 sec)

Rows matched: 2 Changed: 2 Warnings: 0

mysql> flush privileges;

mysql> quit

Bye