linux mysql 忘记root密码

环境：

操作系统：Centos 5.5

数据库：MySQL 5.0.77

过程：

1、关闭mysql。

[root@localhost ~]#service mysqld stop

Stopping MySQL:                                            [  OK  ]

2、跳过授权表启动mysql，关闭网络监听，让其后台运行或者开个新终端。

[root@localhost ~]#mysqld_safe --skip-grant-tables --skip-networking

Starting mysqld daemon with databases from /var/lib/mysql
提示：此时按下CTRL-Z

[1]+  Stopped                 mysqld_safe --skip-grant-tables --skip-networking

[root@localhost ~]#bg

[1]+ mysqld_safe --skip-grant-tables --skip-networking &

3、链接mysql服务器。

[root@localhost ~]#mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.0.77 Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

4、使用mysql数据库。

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

5、设置root新密码。

mysql>update user set password=password('123') where user='root';

Query OK, 3 rows affected (0.01 sec)
Rows matched: 3  Changed: 3  Warnings: 0

6、退出mysql。

mysql>quit

bye

7、重起mysql。

[root@localhost ~]#service mysqld restart

STOPPING server from pid file /var/run/mysqld/mysqld.pid
120928 11:38:28  mysqld ended

Stopping MySQL:                                            [  OK  ]
Starting MySQL:                                            [  OK  ]
[1]+  Done                    mysqld_safe --skip-grant-tables --skip-networking

现在你可以使用新的密码登录mysql了。