Ubuntu 14.10 下MySQL无法远程连接问题

安装好MySQL之后，如果需要远程连接，那么需要做一些配置，否则会出现一些类似的错误，如

mysql root用户ERROR 1045 (28000):
mysql 远程登录 ERROR 1045 (28000)
mysql 远程登录2003
Can not connect to mysql error 10061

1 当MySQL 连接服务器时发生”Can not connect to mysql error 10061”错误

　　将/etc/mysql/my.conf文件中的bind-address选项设置为MySQL服务器的IP，默认为127.0.0.1。

　　然后sudo /etc/init.d/mysql restart --重启服务

2 当MySQL 连接服务器时发生”is not allowed to connect to this MySQL server”错误

　　将MySQL数据库中的user表中的host列的localhost为%

delete from user where user='root' and host <> '%';  -- 删除多余用户
update user set host ='%' where host='localhost' and user='root';  --更新host
select host,user,password from user;

+-----------+------------------+-------------------------------------------+
| host      | user             | password                                  |
+-----------+------------------+-------------------------------------------+
| localhost | debian-sys-maint | *3B3724AE1051D0628525347DAC3635A6C523F944 |
| %         | root             | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| %         | hive             | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
+-----------+------------------+-------------------------------------------+

3 此时没有127.0.0.1和localhost主机，所以无法用root用户进行连接，会提示以下错误

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

　　则此时只能用系统自带的debian-sys-maint用户登录，给root用户赋予新的权限。debian-sys-maint用户的的登录密码在/etc/mysql/debian.cnf中明文显示。

grant all on *.* to root@'%' identified by 'user_password';

4 如果不想root用户被远程登录，可以新建用户

mysql -u root -p
insert into user(Host,User,Password) values("%","hive",password("hive"));
FLUSH PRIVILEGES;

GRANT ALL PRIVILEGES ON *.*  TO 'hive'@'%' IDENTIFIED BY 'hive';
FLUSH PRIVILEGES;