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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:

vim /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/mysql 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

vim /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/mysql restart