keepalive seems not to work

[Marcin Wanat]

On Thu, Oct 8, 2020 at 11:36 AM Łukasz Tasz <lukasz at tasz.eu> wrote:

> Hi all,
>
> can I expect that proxy_pass will keep connection to remote server that is
> being proxied?
>
> when I'm using setup client -> proxy -> server it looks to work
> but when I'm using:
> client -> 1stProxy_upstream -> proxy -> server
> connection between 1stProxy and proxy is being kept thanks to keepalive
> 100, but proxy makes new connection every new request, very simple setup:
>
> http {
>   server {
>     listen 8080;
>     location / {
>       keepalive_disable none;
>       keepalive_requests 1000;
>       keepalive_timeout 300s;
>       proxy_cache proxy-cache;
>       proxy_cache_valid 200 302 301 30m;
>       proxy_cache_valid any 1m;
>       proxy_cache_key $scheme://$http_host$request_uri;
>       proxy_pass $scheme://$http_host$request_uri;
>       proxy_http_version 1.1;
>       proxy_set_header Connection "";
>     }
>   }
> }
> I would expect that when client connects proxy and it works then it should
> also works when proxy connects upstream proxy....
>

For keepalive in upstream proxy you shoud use upstream configuration block
and configure keepalive in it:

upstream backend {
   zone backend 1m;
   server your-server.com;
   keepalive 128;
}

  server {
    listen 8080;
    location / {
      proxy_cache proxy-cache;
      proxy_cache_valid 200 302 301 30m;
      proxy_cache_valid any 1m;
      proxy_cache_key $scheme://$http_host$request_uri;
      proxy_pass $scheme://backend$request_uri;
      proxy_http_version 1.1;
      proxy_set_header Connection "";
    }
  }

--
Marcin Wanat
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