<![CDATA[张宴的博客]]>

<![CDATA[张宴的博客]]> http://zyan.cc/index.php zh-cn http://zyan.cc/post/268/ <![CDATA[百度服务器所在的网通IDC机房挂了[原创]]]> 张宴 <net@s135.com> Wed, 18 Jul 2007 08:05:06 +0000 http://zyan.cc/post/268/
　　后来获知，百度服务器托管的中国网通土城IDC机房发生故障，百度的网通服务器全部无法访问。托管在该机房的大型网站还有搜狐、TOM、九城。我用Linux的dig命令查询出百度的网通IP──202.108.22.5、202.108.22.43，直接访问IP也无法打开：

引用

[root@zhangyan4 zhangyan4]# dig www.baidu.com
;; ANSWER SECTION:
www.baidu.com. 84 IN CNAME www.a.shifen.com.
www.a.shifen.com. 303 IN A 202.108.22.5
www.a.shifen.com. 303 IN A 202.108.22.43

　　20多分钟后，百度恢复正常。我再次dig一下www.baidu.com，发现域名已经解析到220.181.37.4、220.181.38.4这两个电信的IP上：

引用

[root@zhangyan4 zhangyan4]# dig www.baidu.com
;; ANSWER SECTION:
www.baidu.com. 129 IN CNAME www.a.shifen.com.
www.a.shifen.com. 356 IN A 220.181.37.4
www.a.shifen.com. 356 IN A 220.181.38.4

　　百度在DNS服务器更改域名A记录后，几分钟后理应可以生效。但是域名的TTL记录设置了缓存的时间，在这个时间内，如果需要重新解析域名，会直接从用户本地的缓存读取，而不是直接向DNS服务器请求。这样就导致了在百度网通机房发生故障的那段时间内，访问过百度的网通用户在百度切换域名后的一段时间内仍然无法访问。

　　上周，我部署过一组的服务器，可以像百度一样进行电信、网通线路互相切换的容灾处理。但电信切到网通，网通切到电信，必将导致其中一方用户的访问速度变慢，所以只是解决故障的权宜之计。等我们部门本季度的服务器采购到位后，我们将部署北京电信与外地电信，北京网通与外地网通之间的冗余互备。
　　

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