ubuntu 中的mysql server 无法远程连接

问题：① 提示”Can not connect to mysql error 10061” ,如图1

② 提示”is not allowed to connect to this MySQL server”

对于数据库的远程连接不外乎两方面入手：1、客户端至服务器端的连通性。2、服务器端没有合理配置。当然非要加上客户端也没有配置之类的，也尚可，比如ODBC的方式连接MySQL。-_-!

①当MySQL 连接服务器时发生”Can not connect to mysql error 10061”错误，我们检查/etc/mysql/my.conf文件中的bind-address选项是否设置为服务器的IP，默认为127.0.0.1。

做如下操作：

cl@ubuntu:~$ sudo vi /etc/mysql/my.cnf --修改文本内容

修改bind-address = 127.0.0.1

为 bind-address = 服务器IP

:wq --保存退出

cl@ubuntu:~$ 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，我们要注意在MySQL的user表中修改host列的localhost为%，即可以远程连接。

做如下操作：

mysql> use mysql --切换数据库上下文

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select host,user,password from user; --查询USER 表

+-----------+------------------+-------------------------------------------+

| host | user | password |

+-----------+------------------+-------------------------------------------+

| localhost | root | *MD5加密 |

| ubuntu | root | *MD5加密 |

| 127.0.0.1 | root | *MD5加密 |

| localhost | debian-sys-maint | * MD5加密|

+-----------+------------------+-------------------------------------------+

mysql> delete from user where user='root' and host <> '%'; --删除多余用户

Query OK, 2 rows affected (0.00 sec)

mysql> update user set host ='%' where host='localhost' and user='root'; --更新host

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

mysql> select host,user,password from user;

+-----------+------------------+-------------------------------------------+

| host | user | password |

+-----------+------------------+-------------------------------------------+

| % | root | *MD5加密|

| localhost | debian-sys-maint | * MD5加密|

+-----------+------------------+-------------------------------------------+

2 rows in set (0.00 sec)

注：如果在修改User时失误出现以下结果，怎么办？

mysql> select host,user,password from user;

+-----------+------------------+-------------------------------------------+

| host | user | password |

+-----------+------------------+-------------------------------------------+

| ubuntu | root | * MD5加密|

| localhost | debian-sys-maint | * MD5加密|

+-----------+------------------+-------------------------------------------+

2 rows in set (0.00 sec)

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

~$ mysql -u root -p

Enter password:

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，修改host。该用户的的登录密码在/etc/mysql/debian.cnf中明文显示。

比如：

host = localhost

user = debian-sys-maint

password = 明文密码

socket = /var/run/mysqld/mysqld.sock

basedir = /usr

做如下操作：

~$ mysql -u debian-sys-maint -p

Enter password:

mysql> use mysql;

mysql> update user set host ='%' where host='ubuntu';

mysql> exit

~$ sudo /etc/init.d/mysql restart

清理思路，注意操作后需重启服务