在ubuntu14.04上安装好mysql5.7之后，本地可以连接mysql服务器。
远程就不行。

注释掉在/etc/mysql/mysql.conf.d/mysqld.cnf里面的bind-address = 127.0.0.1

# By default we only accept connections from localhost
#bind-address   = 127.0.0.1

如果还有问题，如Access denied for user ‘root’@’ip地址’ (using password: YES)

mysql -uroot -p

输入root用户密码，进入mysql服务器命令行

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

然后用以下命令查看哪些用户和host可以访问，%代表任意ip地址

select user,host from user;