在dos命令提示下直接使用nslookup + 网址 即可看到网站的架构布局.

在dos命令提示下直接使用nslookup + 网址 即可看到网站的架构布局.
摘录如下:

门户级网站架构设计
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 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 16 ip 上,这16 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 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。
3、 网易
网易似乎没用ChinaCache 的服务,下面是nslookup 结果:
> www.163.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: www.163.com
Addresses:202.106.168.103, 202.106.168.104, 202.106.168.109, 202.106.168.121 202.108.36.153, 202.108.36.155, 202.108.36.156, 202.108.36.167, 202.108.36.172 202.108.36.196
直接在www.163.com 这个域名上做了DNS 负载均衡。这样的话就要求服务器必须放的非常靠近主节点,才能保证各地的用户访问的速度。
163 不同的频道是放在不同的缓存集群上的,这与sina sohu 有些不同,等于sina sohu 是按照地区划分服务器集群,而网易按照频道划分服务器集群。
> 163.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: 163.com
Addresses:202.108.36.205, 202.108.36.206, 202.108.36.207, 202.108.36.201 202.108.36.202, 202.108.36.203, 202.108.36.204
显然,这和 www.163.com 不是一个集群,我们再来试一个:
> sports.163.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: channel.cache.163.com
Addresses:202.108.36.136, 202.108.36.208, 202.108.36.209, 202.108.36.210 202.108.36.211, 202.108.36.212, 202.108.36.213
Aliases:sports.163.com
可以看出,和上面的集群也是不同的。
4、 百度
百度的前台服务器就不是很多了:
> www.baidu.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: www.baidu.com
Addresses:202.108.250.249, 202.108.249.134
> baidu.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: baidu.com
Address:202.108.250.228
> mp3.baidu.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: mp3.baidu.com
Address:202.108.249.131
只有 www.baidu.com 做了两台服务器的集群,频道都用了一台服务器做前台
5、 一搜
> yisou.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: yisou.com
Addresses:202.165.102.114, 202.43.217.14, 202.43.217.15, 202.43.217.16 202.43.217.17, 202.165.102.111, 202.165.102.112, 202.165.102.113
> www.yisou.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: www.yisou.com
Addresses:202.43.217.17, 202.165.102.111, 202.165.102.112, 202.165.102.113 202.165.102.114, 202.43.217.14, 202.43.217.15, 202.43.217.16
> mp3.yisou.com
Server:UnKnown
Address:192.168.1.254
Non-authoritative answer:
Name: www.yisou.com
Addresses:202.165.102.113, 202.165.102.114, 202.43.217.14, 202.43.217.15 202.43.217.16, 202.43.217.17, 202.165.102.111, 202.165.102.112
Aliases:mp3.yisou.com
前台做了8 台服务器的缓存集群,www.yisou.com yisou.com 以及mp3.yisou.com 是用的同一个集群。
通过前面的分析我们可以得到一个结论:sina sohu 使用了CDN GSBL DNS 负载均衡技术,每个地区一组前台服务器群,网易,百度使用了DNS 负载均衡技术,每个频道一组前台服务器,一搜使用了DNS 负载技术,所有频道共用一组前台服务器集群

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