代理上网奇怪的问题,squid

ylky_2000

squid代理最近出现这样的问题:
在服务器里能解析域名,但是在客户端就是上不了网,具体的提示有:
The requested URL could not be retrieved

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While trying to retrieve the URL: http://www.baidu.com/

The following error was encountered:

Unable to determine IP address from host name for www.baidu.com
The dnsserver returned:

Temporary network problem, please retry later
This means that:

The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.
Your cache administrator is 84771409(77314).



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Generated Wed, 27 Aug 2008 03:29:30 GMT by Panyu-proxy (squid/2.5.STABLE14)
在服务器里查看日志 cat /var/log/squid/cache.log
提示如下:
2008/08/27 11:30:22| dnsSubmit: queue overload, rejecting tg4a31.mail.163.com
我查看dns进程的确有很多,kill一些dns进程后,可以上网了，但是这个不是解决问题的最终办法,请问各位高手,如何解决这个问题呢?

xiao6

如果是dns请求超载的话cache.log中应该有如下两句
2008/08/14 11:44:03| WARNING: All dnsserver processes are busy.
2008/08/14 11:44:03| Consider increasing the number of dnsserver processes to at least 288 in your config file.
上边是我的服务器在14日发生的超载日志，当天突然出现大量dns请求，上边的日志最少要设置288个dns服务线程，平时我用64个满足了，实际到后来我增加到400+才不超载了。

修改squid.conf
dns_children 64

调整dns服务线程数

ylky_2000

还有个问题，就是首页能打开，确认不是缓存中的。下面的链接就打不开，提示的内容也是同样的。
我打开www.sohu.com后，点击“新闻”后
The requested URL could not be retrieved

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While trying to retrieve the URL: http://news.sohu.com/

The following error was encountered:

Unable to determine IP address from host name for www.baidu.com
The dnsserver returned:

Temporary network problem, please retry later
This means that:

The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.
Your cache administrator is 84771409(77314).

xiao6

这个应该不是每个客户端都出现的问题，有可能是baidu插件的原因，换一台干净的客户端计算机试试。

liuhanzhao

按2楼的方法先查下吧，多数是dns_children参数过小造成的，按我以前做过的经验，两台squid供800人上网，每天dns_children我设置在150