摘自: http://www.iteye.com/topic/418151

mysql数据库远程访问设置方法

1、修改localhost
更改 "mysql" 数据库里的 "user" 表里的 "host" 项，从"localhost"改成"%" 
mysql>use mysql; 
mysql>update user set host = '%' where user = 'root'; 
mysql>select host, user from user;
mysql>FLUSH PRIVILEGES;

2、指定授权
使用myuser/mypassword从任何主机连接到mysql服务器: 
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;

使用myuser/mypassword从ip为192.168.225.166的主机连接到mysql服务器:
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.225.166' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;

3、泛授权
mysql -h localhost -u root 
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION; //赋予任何主机上以root身份访问数据的权限 
mysql>FLUSH PRIVILEGES;

解决Mysql无法远程连接的问题

1、Mysql的端口是否正确
通过netstat -ntlp 查看端口占用情况，一般情况下端口是3306。在用工具连接MySQl是要用到端口。例如My Admin\My Query Browser\MySQl Front等。

2、检查用户权限是否正确
mysql库的user表里有两条记录：host分别为localhost和%(为了安全，%可以换成你需要外部连接的IP)。

3、查看/etc/mysql/my.cnf中,skip-networking 是否已被注掉
需要注掉
报错：ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.51.112' (111)

sudo gedit /etc/mysql/my.cnf 
#skip-external-locking

#bind-address        = 127.0.0.1

skip-name-resolve

4、查看iptables是否停掉,没关的情况下,无法连接
通过：service iptables stop临时关闭。
报错：ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.51.112' (113)