Linux下MySQL忘记root用户密码

今天在接收一台MySQL服务器的时候发现忘记MySQL的root用户的密码,查找资料发了各种文档里面也没有root用户密码,因此需要修改root用户密码。

首先确认服务器出于安全的状态,也就是没有人能够任意地连接MySQL数据库。因为在重新设置MySQL的root密码的期间,MySQL数据库完全出于没有密码保护的状态下,其他的用户也可以任意地登录和修改MySQL的信息。最安全的状态是到服务器的Console上面操作,并且拔掉网线。
1、修改MySQL的登录设置:
在[mysqld]的段中加上的skip-grant-tables

# sed -i '/mysqld/a\skip-grant-tables ' /etc/my.cnf

2、重新启动mysqld

# service mysqld restart
Shutting down MySQL. SUCCESS!
Starting MySQL. SUCCESS!

3、登录并修改MySQL的root密码

# /usr/bin/mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.19 Source distribution

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

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 ( 'root' ) WHERE User = 'root' ;
Query OK, 3 rows affected (0.01 sec)
Rows matched: 3  Changed: 3  Warnings: 0

mysql> flush privileges ;
Query OK, 0 rows affected (0.01 sec)

mysql> quit
Bye

4、将MySQL的登录设置修改回来
将刚才在[mysqld]的段中加上的skip-grant-tables删除

# sed -i "/skip-grant-tables/d" /etc/my.cnf

5、重新启动mysqld

# service mysqld restart
Shutting down MySQL. SUCCESS!
Starting MySQL. SUCCESS!

这个时候,就可以使用root/root进行登录了

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