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# 1.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。可以采用将MySQL对 外的端口封闭,并且停止Apache以及所有的用户进程的方法实现服务器的准安全 状态。最安全的状态是到服务器的Console上面操作,并且拔掉网线。

# 2.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
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保存并且退出vi。

# 3.重新启动mysqld

$ /etc/init.d/mysqld restart 或者service mysqld restart
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]
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# 4.登录并修改MySQL的root密码

[root@bogon bin]# /usr/bin/mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.49 MySQL Community Server (GPL) by Remi

Copyright (c) 2000, 2016, 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;

mysql> UPDATE user SET Password = password ( 'lizhen7' ) WHERE User = 'root' ;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 4  Changed: 0  Warnings: 0
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至此,密码修改完毕

# 5.将MySQL的登录设置修改回来

vi /etc/my.cnf
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将刚才在[mysqld]的段中加上的skip-grant-tables删除 保存并且退出vi。

# 6.重新启动mysqld

/etc/init.d/mysqld restart
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]
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