第一节：忘记 mysql 密码
1.1 停止服务
[root@centos6 ~]# service mysqld stop
停止 mysqld： [确定]
1.2 修改配置文件
[root@centos6 ~]# vim /etc/my.cnf
[mysqld]
......
skip-grant-tables # 在[mysqld]中加入该字段
# Disabling symbolic-links is recommended to prevent assorted security risks
1.3 重启服务，并登录
[root@centos6 ~]# service mysqld start
正在启动 mysqld： [确定]
[root@centos6 ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.1.73 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>
1.4 切换当前数据库
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
1.5 修改密码
mysql> update user set password=password('123456') where user='root' and Host = 'localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> exit
Bye
1.6 停止服务，修改配置
[root@centos6 ~]# service mysqld stop
停止 mysqld： [确定]
[root@centos6 ~]# vim /etc/my.cnf
[mysqld]
......
# skip-grant-tables
# Disabling symbolic-links is recommended to prevent assorted security risks
[root@centos6 ~]# service mysqld start
正在启动 mysqld： [确定]
[root@centos6 ~]# mysql -uroot -p123456
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.1.73 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> # 成功