proxied request hang when DNS server down

[ywsample]

thanks

but I think nginx should not always pending requests and retry dns
forever。and inconsistent response to the first request and follow requests
is also a problem. either all as a timeout processing, either all waiting
dns response

may be nginx need change this behavior


2014-08-20 14:41 GMT+08:00 SmallAnt <unixant at gmail.com>:

> this module can help you !
> HttpUpstreamJdomainModule, http://wiki.nginx.org/HttpUpstreamJdomainModule
> .
>
> It buffers the latest IPs of the host,even local dns server down, nginx
> will work well.
>
>
> On Tue, Aug 19, 2014 at 1:43 PM, ywsample <ywsample at gmail.com> wrote:
>
>> http {
>>     resolver 127.0.0.1;
>>     resolver_timeout 1s;
>>     server {
>>         listen 8000;
>>         location /test {
>>             proxy_pass http://$arg_host:8080;
>>         }
>>     }
>>     server {
>>         listen 8080;
>>         .......
>>     }
>>  }
>> ps: other configure is normal
>>
>> I have recently discoverd that when DNS server down, the first proxy
>> request return 504 and than the follow proxy request may hang forever.
>>  I use two curl simulate concurrent requests
>>
>> I found than the first request timeout in 1 second and exit, also it
>> delete the timeout timer. because another request waiting dns response, so
>> nginx retry send dns query, but dns never response(because it down), it
>> lead to the follow request hang and also no timer relate to it;
>>
>> PS：base on nginx-1.7.4
>> --
>> ywsample :)
>>
>>
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>
>
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-- 
ywsample :)
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