1.阿里云后台安全实例，添加开启mysql端口3306，入方向

2.登录到mysql, 授权外部可链接

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION;

FLUSH PRIVILEGES;

 

3.修改my.cnf配置。添加

bind-address = 0.0.0.0

 

4.重启mysql，/etc/init.d/mysql restart 

5.还不行就重启服务器。