MySQL的root密码忘记后重置方法

标签：mysql   密码   

如果忘记了MySQL的root密码怎么办？

我们默认的情况下是没有给MySQL设置密码的，如下

默认的登录MySQL

[root@LAMPLINUX ~]# mysql -uroot

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.1.40-log MySQL Community Server (GPL)

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

mysql>quit

Bye

正常情况下为了安全考虑我们应该给MySQL去设置一个密码

[root@LAMPLINUX ~]# mysqladmin -uroot password ‘lamlinux‘

设置完成，我们再次登录就要输入密码了

[root@LAMPLINUX ~]# mysql -uroot -plamlinux

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.1.40-log MySQL Community Server (GPL)

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

mysql>quit

Bye

假如说我们密码忘记了怎么办，登陆不上MySQL怎么办？

把密码初始化，重新设置一个，

进入配置文件

[root@LAMPLINUX ~]# vim /etc/my.cnf

在‘慢查询’下面加入一句话

skip-grant （跳过授权）

：wq

重启MySQL

[root@LAMPLINUX ~]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

Starting MySQL. SUCCESS!

初始化完成

可以直接用“mysql”命令，不需要输入-p密码，就可以直接进入MySQL了，

[root@LAMPLINUX ~]# mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.1.40-log MySQL Community Server (GPL)

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

mysql>

然后去使用mysql库

mysql> use mysql

No connection. Trying to reconnect...

Connection id:    2

Current database: *** NONE ***

Database changed

然后去更新一个表，即更改root用户的密码

mysql> update user set password=password(‘lam2linux‘) where user=‘root‘;

ERROR 2006 (HY000): MySQL server has gone away

No connection. Trying to reconnect...

Connection id:    4

Current database: mysql

Query OK, 3 rows affected (0.01 sec)

Rows matched: 3  Changed: 3  Warnings: 0

从信息中我们看到Query OK, 3 rows affected (0.01 sec)显示第3行发生改变，

用以下命令可以查看变更信息

mysql>select * from user where user=‘root‘\G;

退出MySQL

mysql>exit

我们再把MySQL配置文件里的“skip-grant”去掉

[root@LAMPLINUX ~]# vim /etc/my.cnf

去掉 skip-grant

：wq

重启MySQL

[root@LAMPLINUX ~]# /etc/init.d/mysqld restart

Shutting down MySQL. SUCCESS!

Starting MySQL. SUCCESS!

再次登录MySQL需要输入密码

[root@LAMPLINUX ~]# mysql -uroot -plam2linux

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.1.40-log MySQL Community Server (GPL)

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

mysql>

至此，修改密码后并成功登录

MySQL的root密码忘记后重置方法

标签：mysql   密码   

原文地址：http://286577399.blog.51cto.com/10467610/1673322