1.检测配置文件（/etc/mysql/mysql.conf.d/mysqld.cnf） 注释掉bind-address = 127.0.0.1；作用是不再只允许本地访问；
2.重启mysql：/etc/init.d/mysql restart;
3.GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION;
4.flush privileges;