技术分析:各大门户网站的CDN架构设计

时间:2008-10-03 13:06:48  来源:第二电脑网上收集  作者:

  第二电脑网导读:www.sina.com.cn   Server: UnKnown   Address: 192.168.1.254   Non-authoritative answer:   Name: libra.sina.com.cn   Addresses: 61.135.152.71, 61.135.152.72, 61.135.152.73, 61.135.152.74 61.135.152.75, 61.135.152.76, 61.135.153.181, 61.135.153.182, 61.135.53.183, 61.135.153.184, 61.135.152.6...
  正文:

  1、 新浪

  新浪采用了ChinaCache做的CDN系统,ChinaCache在全国分布了四十多个点,同时采用基于动态DNS分配的全球服务器负载均衡技术。

  从新浪的站点结构可以看出:

  > www.sina.com.cn

  Server: UnKnown

  Address: 192.168.1.254

  Non-authoritative answer:

  Name: libra.sina.com.cn

  Addresses: 61.135.152.71, 61.135.152.72, 61.135.152.73, 61.135.152.74 61.135.152.75, 61.135.152.76, 61.135.153.181, 61.135.153.182, 61.135.53.183, 61.135.153.184, 61.135.152.65, 61.135.152.66, 61.135.152.67, 61.135.12.68, 61.135.152.69, 61.135.152.70

  Aliases: www.sina.com.cn, jupiter.sina.com.cn

  在北京地区ChinaCache将www.sina.com.cn的网址解析到libra.sina.com.cn,然后libra.sina.com.cn做了DNS负载均衡,将libra.sina.com.cn解析到61.135.152.71等16个ip上,这16个ip分布在北京的多台前台缓存服务器上,使用squid做前台缓存。如果是在其它地区访问www.sina.com.cn可能解析到本地相应的服务器,例如pavo.sina.com.cn,然后pavo又对应了很多做了squid的ip。这样就实现了在不同地区访问自动转到最近的服务器访问,达到加快访问速度的效果。

  我们再看一个新浪其它频道是指到哪里的:

  > news.sina.com.cn

  Server: UnKnown

  Address: 192.168.1.254

  Non-authoritative answer:

  Name: libra.sina.com.cn

  Addresses: 61.135.152.65, 61.135.152.66, 61.135.152.67, 61.135.152.68 61.135.152.69, 61.135.152.70, 61.135.152.71, 61.135.152.72, 61.135.152.73 61.135.153.178, 61.135.153.179, 61.135.153.180, 61.135.153.181, 61.135.153.182 61.135.153.183, 61.135.153.184

  Aliases: news.sina.com.cn, jupiter.sina.com.cn

  可以看出,各个频道的前台缓存集群与www.sina.com.cn的前台缓存集群是相同的。

  2、搜狐

  Sohu与新浪的原理差不多,下面是nslookup的结果:

  > www.sohu.com

  Server: UnKnown

  Address: 192.168.1.254

  Non-authoritative answer:

  Name: pagegrp1.sohu.com

  Addresses: 61.135.132.172, 61.135.132.173, 61.135.132.176, 61.135.133.109 61.135.145.47, 61.135.150.65, 61.135.150.67, 61.135.150.69, 61.135.150.74 61.135.150.75, 61.135.150.113, 61.135.150.145, 61.135.131.73, 61.135.131.91 61.135.131.180, 61.135.131.182, 61.135.131.183, 61.135.132.65, 61.135.

  132.80

  Aliases: www.sohu.com

  只不过libra.sina.com.cn换成了pagegrp1.sohu.com

  我们再来看一下sohu的频道:

  > news.sohu.com

  Server: UnKnown

  Address: 192.168.1.254

  Non-authoritative answer:

  Name: pagegrp1.sohu.com

  Addresses: 61.135.145.47, 61.135.150.65, 61.135.150.67, 61.135.150.69 61.135.150.74, 61.135.150.75, 61.135.150.113, 61.135.150.145, 61.135.131.73 61.135.131.91, 61.135.131.180, 61.135.131.182, 61.135.131.183, 61.135.132.65 61.135.132.80, 61.135.132.172, 61.135.132.173, 61.135.132.176, 61.135.133.109

  Aliases: news.sohu.com

  同新浪相同,用的是同样的服务器群,这可能是因为他们用的都是ChinaCache的服务吧,不过sohu的名字起的有点土,pagegrp1,没有libra,pavo好听,这名字听起来有点像法语,比较浪漫。


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