<![CDATA[张宴的博客]]> http://zyan.cc/index.php zh-cn http://zyan.cc/post/377/ <![CDATA[从豆瓣宕机看IDC单点问题]]> 张宴 <net@s135.com> Fri, 31 Oct 2008 09:26:53 +0000 http://zyan.cc/post/377/ 豆瓣从上午11点开始宕机（见：http://blog.douban.com/douban/2008/10/31/139/），到现在已经超过6个小时了。

　　豆瓣的服务器托管在京东某BGP机房，我在那个机房有机器，试了试，从IDC内部是能访问的。另外，和豆瓣同一IP段的http://59.151.41.22/从外部是能够访问的。所以，我估计是IDC机房内豆瓣那一组线路的问题。

　　看来，多IDC异地容灾还是很重要的。IDC不出问题则以，一出问题，就成了最大的单点。

　　IDC机房内部到豆瓣路由是通的：
[root@localhost ~]# traceroute www.douban.com
traceroute to www.douban.com (59.151.41.93), 30 hops max, 38 byte packets
1  59.151.xxx.xxx (59.151.xxx.xxx)  0.929 ms  0.917 ms  0.954 ms
2  59.151.96.65 (59.151.96.65)  0.534 ms  0.249 ms  0.263 ms
3  211.151.227.86 (211.151.227.86)  1.931 ms  1.100 ms  2.053 ms
4  59.151.41.93 (59.151.41.93)  0.259 ms  0.252 ms  0.265 ms


　　从IDC机房内部是能访问豆瓣的：
[root@localhost ~]# wget http://www.douban.com/
--16:12:15--  http://www.douban.com/
          => `index.html'
Resolving www.douban.com... 59.151.41.93
Connecting to www.douban.com|59.151.41.93|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 17,074 (17K) [text/html]

100%[=========================>] 17,074        --.--K/s            

16:12:15 (12.21 MB/s) - `index.html' saved [17074/17074]


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