1. 修改MySQL的登录设置：
# vi /etc/my.cnf
2. 在[mysqld]的段中加上一句：skip-grant-tables
例如：
[mysqld]
port = 3306
socket = /application/mysql-5.5.32/tmp/mysql.sock
skip-external-locking
key_buffer_size = 16K
max_allowed_packet = 1M
table_open_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 128K
skip-grant-tables
保存并且退出vi。
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
mysql> use mysql ;
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 ]
7. 设置远程登录(可以用Navicat登陆)
登陆mysql：mysql -uroot -p
回车输入密码
然后运行
mysql> grant all privileges on *.* to '用户名'@'%' identified by '密码' withg rant option;
mysql> flush privileges ;