mysql重置密码步骤_mysql

mysql默认目录：

安装目录：/var/lib/mysql

配置文件目录：/usr/share/mysql

mysql工具：/usr/bin

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 
保存并且退出vi。 

注：如果etc目录下没有my.cnf文件

进入到 /usr/share/mysql 目录，拷贝 my-medium.cnf 文件到 /etc 下并修改文件名为 my.cnf

3．重新启动mysqld 
# /etc/init.d/mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ] 

4．登录并修改MySQL的root密码 
# /usr/bin/mysql 

Enter password: 

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

Your MySQL connection id is 1

Server version: 5.5.37-log MySQL Community Server (GPL)

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.

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

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 ( ‘new-password’ ) WHERE User = ‘root’ ; 
Query OK, 0 rows affected (0.00 sec) 
Rows matched: 2 Changed: 0 Warnings: 0 
mysql> flush privileges ; 
Query OK, 0 rows affected (0.01 sec) 
mysql> quit 
Bye 

5．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。 

6．重新启动mysqld 
# /etc/init.d/mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]