linux下mysql root密码忘记解决办法

场景：很多时候由于找不到之前存储root密码的记录或者其他原因忘记了root密码,
这个时候就需要重置MySQL的root密码。
具体操作步骤如下：
1、修改MySQL的登录设置： 
# vi /etc/my.cnf 
在[mysqld]的段中加上一句：skip-grant-tables 
例如： 

[mysqld] 
datadir=/var/lib/mysql 
socket=/var/lib/mysql/mysql.sock 
skip-grant-tables 

保存并且退出vi。 
2、重新启动mysqld，命令如下
# /etc/init.d/mysqld restart 
3、登录并修改MySQL的root密码 

# mysql -uroot -p 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.5.36-log Source distribution
Copyright (c) 2000, 2013, 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.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> USE mysql ; 
Database changed 
mysql> update user set password = password('new-password') where user='root';
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4  Changed: 4  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 
# vi /etc/my.cnf 
将刚才在[mysqld]的段中加上的skip-grant-tables删除 
保存并且退出vi。 
5、重新启动mysqld 
# /etc/init.d/mysqld restart