默认用户是通过localhost访问的。

登陆mysql后，切换到mysql数据库，修改user表中指定用户的host字段内容。

USE mysql;SELECT USER, HOST FROM USER WHERE USER ='root';UPDATE USER SET HOST = '%'  WHERE USER ='root';FLUSH PRIVILEGES;

或者

Grant all privileges on *.* to 'root'@'%' identified by '你的密码' with grant option;flush privileges;