忘记mysql登录密码解决办法

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本文介绍如何通过修改MySQL配置文件来重置root用户的密码。首先需要确保能够编辑配置文件并重启MySQL服务。通过在配置文件中加入skip-grant-tables跳过权限验证，然后登录MySQL并使用SQL命令更新root用户的密码。

非原创,原文转载自: http://snowolf.iteye.com/blog/1625674

要修改MySQL的root密码，有两个先决条件：
•有修改MySQL配置文件的权限
•有重启MySQL服务的权限

先修改配置文件：

# vim /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1

# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

在[mysqld]下增加skip-grant-tables，即跳过权限验证。

然后登录MySQL，修改root密码：
# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.0.95 Source distribution

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('<Your Password>') where user='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0

mysql> flush privileges ;
Query OK, 0 rows affected (0.00 sec)

mysql> quit
Bye

然后把刚才修改的配置文件再改回来，最后重启服务：

# service mysqld restart
停止 MySQL： [确定]
启动 MySQL： [确定]