proxied request hang when DNS server down

[SmallAnt]

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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