Varnish round-robin loadbalancing with Virtualhost (Namebased)

[Tharanga Abeyseela]

Hi Per,

Thanks for the reply. Actually my set up looks like this.


cluster.com - 192.168.0.200 (varnish/port 80)
xxx.com - 192.168.0.100  (apache,namebased vhost/8080 - backendname -
website)
yyy.com - 192.168.0.100  (apache,namebased vhost/8080 -backendname - api)

cluster.com is the varnish server and front-end connections coming to this
and rewrite to other defined back-ends (round-robin based balancing)

backend website {
    .host = "xxx.com";
    .port = "8080";

}
backend api {
    .host = "yyy.com";
    .port = "8080";

}

director clust round-robin {
{ .backend = api;  }
{ .backend = website;  }

}

sub vcl_recv {
set req.backend = clust;
if (req.request)
    {
    return(pass);
    }

}


when i hit the cluster.com , it is always going to xxx.com, but what i need
to do is first request go to xxx.com second request yyy.com and so
on...when i add another server (different host/different IP say
192.168.0.111/zzz.com, and a different backend) , it goes like this

first request - xxx.com
second request - xxxx.com
third request - zzz.com


but i can change the default behavior by setting up set req.host =
yyy.comand then it will goes to
first request - yyy.com
second request - yyy.com
third request - zzz.com

this is something to do with the host-header forwarding to the correct
back-end. how should i add that functionality to the vcl_recv ?
appreciate your help on this, this is working perfectly with other servers
(different servers, not with namebased vhosts)

cheers,
Tharanga















On Thu, Aug 29, 2013 at 11:58 PM, Per Buer <perbu at varnish-software.com>wrote:

> Hi mate,
>
> On Thu, Aug 29, 2013 at 3:17 PM, Tharanga Abeyseela <
> tharanga.abeyseela at gmail.com> wrote:
>
>> (..)
>>
>> But how should i send host-headers to varnish to redirect to the correct
>> server, This is always going to xxx.com.
>>
>
> You don't. :-)
>
> You need to dispatch the request to the right backend in vcl_recv and have
> the backend handle that host. You could start rewriting the host in
> vcl_recv, but I would advise against it.
>
> So, if you have two vhosts handled by "website" you just set that as the
> backend in vcl_recv.
>
> --
>  <http://www.varnish-software.com/> *Per Buer*
> CTO | Varnish Software AS
> Phone: +47 958 39 117 | Skype: per.buer
> We Make Websites Fly!
>
> Winner of the Red Herring Top 100 Europe Award 2013
>
>
>
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