Hello!

You need to use resolver directive in Nginx.
Also you need to set DNS entries for your backend hostname.

Best regards,
Makailol


On Wed, Apr 9, 2014 at 1:49 PM, kay <nginx-forum@nginx.us> wrote:

> I'm trying to set upstream names by variables, but nginx recognizes
> variables as hostnames, not upstream names.
>
> For example:
> map $cookie_backend $proxy_host {
> default 'backend1';
> '1' 'backend2';
> }
> ... ... ...
> upstream backend1 {
> server backend123:8080;
> server backend124:8080;
> }
> ... ... ...
> upstream backend2 {
> server backend223:8080;
> server backend224:8080;
> }
> ... ... ...
> location / {
> proxy_pass http://$proxy_host;
> }
>
> nginx returns error message:
> 2014/04/09 14:19:51 [error] 1085#0: *1128620 backend1 could not be resolved
> (3: Host not found) while sending to client, client: 192.168.1.145, server:
> localhost, request: "GET / HTTP/1.1", host: "localhost"
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,249142,249142#msg-249142
>
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