设置mysql允许外网访问

mysql -u root -p 密码
use mysql;
select host, user from user;
update user set host = '%' where user ='root' and host = 'localhost';
select host, user from user;
flush privileges;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'  IDENTIFIED BY 'admin123'  WITH GRANT OPTION;
flush privileges;

现在就可以使用root用户，密码admin123从外网访问了