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。由于在重新设置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，其他的用户也能够任意地登录和修改MySQL的信息。可以采取将MySQL对 外的端口封闭，并且停止Apache和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1句：skip-grant-tables
例如：
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables 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
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 3 to server version: 3.23.56
Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
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
6．重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]Work for fun,Live for love!