how to use keepalive with Nginx revers proxy?

[Maxim Dounin]

Hello!

On Thu, Apr 03, 2014 at 09:31:08AM +0530, Makailol Charls wrote:

> Hi Maxim,
> 
> Thanks for reply.
> 
> Number of IPs are not fixed so it is not possible to define upstream and
> map block I think. I am trying to implement completely dynamic
> configuration using lua module.
> 
> 
> Is it possible to use variable in upstream block like this?
> upstream backend {
>     server $IP;
>     keepalive 2;
> }

No, this won't work.

> 
> location / {
>     proxy_pass http://backend;
>     proxy_http_version 1.1;
>     proxy_set_header Connection "";
> }
> 
> 
> Thanks,
> Makailol
> 
> 
> On Wed, Apr 2, 2014 at 7:29 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> 
> > Hello!
> >
> > On Wed, Apr 02, 2014 at 06:55:42PM +0530, Makailol Charls wrote:
> >
> > > Hi,
> > >
> > > Can some one provide me an example to set keep alive connection between
> > > Nginx(reverse proxy) and backend server?
> > >
> > > I can not use upstream module as my backend IP is dynamic based on
> > > variable. So I can not use keepalive directive of upstream.
> > >
> > > I have used below directive in location block.
> > > proxy_pass http://$IP ;
> >
> > Use of keepalive connections require upstream{} block to be
> > defined, see here for examples:
> >
> > http://nginx.org/r/keepalive
> >
> > As long as list of backend ip addresses is limited, you may define
> > appropriate upstream{} blocks for each backend, and use upstream's
> > name in a variable, e.g.:
> >
> >     upstream backend1 {
> >         server 192.168.0.1;
> >         keepalive 2;
> >     }
> >
> >     ...
> >
> >     map $IP $backend {
> >         192.168.0.1  backend1;
> >         ...
> >     }
> >
> >     location / {
> >         proxy_pass http://$backend;
> >         proxy_http_version 1.1;
> >         proxy_set_header Connection "";
> >     }
> >
> > --
> > Maxim Dounin
> > http://nginx.org/
> >
> > _______________________________________________
> > nginx mailing list
> > nginx at nginx.org
> > http://mailman.nginx.org/mailman/listinfo/nginx
> >

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-- 
Maxim Dounin
http://nginx.org/