Linux下最简单的动态域名解析

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一、准备材料

1、在国内动态域名解析一般使用花生壳，即oray.com这个家伙，可以免费申请一个二级域名（oray帐号一个）；
2、注册了oray帐号你就能申请到一个免费的支持动态域名解析的二级域名（支持动态域名解析的域名一个）；
3、如果你有自己的顶级域名，觉得使用别人的二级域名不够屌，可以呀，做别名处理简单搞定（顶级域名一个，这个没有没关系）；
4、Linux或Unix或类Unix主机一台（我在这里针对小米路由器做测试，前提是小米路由器已经root了，能够ssh登录后台）；

二、基本原理

1、假如家里使用的ADSL拨号上网，路由器上会获得一个公网ip地址；
2、我想通过某个域名对应这个ip地址，但这个ip地址随着每次的拨号都会发生变化；
3、通过某种机制，当ip发生变化时告诉DNS服务器，让他即时更新；
4、问题来了，谁来告诉DNS服务器ip变了？这是我们今天的重点！

三、解决方案

1、小米路由器在路由模式下支持DDNS，直接输入花生壳的用户名及密码，对应域名，路由器会自动上报ip给oray的DNS服务器更新；
2、如果在桥接模式下，路由器的DDNS功能无法使用，至少界面上无法操作到了，实际上应该是能用的，因为小米路由器本身不也要升级吗？
3、oray是有PC客户端的，但总不能为了一个动态ip搞台电脑24小时待机，不实在，有嵌入式的客户端那可接受，小米路由器支持该功能实际上就是安装了这种嵌入式的小客户端；
4、如果没有，还有一个办法可以解决，啰嗦了这么多总算谈到重点上了，先看看花生壳官网的 说明

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方式1：使用URL验证     适用于浏览器或应用程序（fetch, curl, lwp-request）
访问地址：http:/username:password@ddns.oray.com/ph/update?hostname=yourhostname&myip=ipaddress
 
方式2：原始HTTP GET访问    如何在ROS中设置花生壳ddns
GET /ph/update?hostname=yourhostname&myip=ipaddress HTTP/1.0
Host: ddns.oray.com
Authorization: Basic base-64-authorization
User-Agent: Oray
注：其中 base-64-authorization 请使用 Base64 加密 username:password 后的字符替换

四、实现方式

1.1、vi /etc/rc.local
1.2、在exit 0前面添加一行内容如下，实现开机即自动刷新一次；

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wget -q -O /tmp/log/oray.log 'http://用户名:密码@ddns.oray.com/ph/update?domain= 动态域名'

中文部分根据实际替换
2.1、vi /etc/crontabs/root
2.2、在最后面添加一行，实现每10分钟自动刷新一次；

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*/10 * * * * wget -q -O /tmp/log/oray.log 'http://用户名:密码@ddns.oray.com/ph/update?domain=动态域名'

参考链接：Linux如何设置定时任务

One thought on “Linux下最简单的动态域名解析”

  1. JamesPew

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