Dual server Varnish setup

[Martin Boer]

I would also add weights so that each varnish prefers to ask its sibling 
say 250 times more often than asking the app-server.
This will ensure that both varnishes will be as filled and as equal as 
possible.
I don't know if 250 could be replaced by a larger number but this works 
for me.

Regards,
Martin

On 02/10/2011 02:46 PM, Laurence Rowe wrote:
> On 8 February 2011 23:05, Ben Dodd<B.Dodd at comicrelief.com>  wrote:
>> Given this functionality, does anyone know what the VCL is required to implement this dual server Varnish setup scenario?
>> http://varnish-cache.org/trac/wiki/VCLExampleHashIgnoreBusy
> Something like this should work:
>
>
> backend appserver { ... }
> backend other_varnish { ... }
>
> # Server 1
> sub vcl_recv {
>      set req.backend = other_varnish;
>      if (req.http.X-Via-Varnish || !req.backend.healthy) {
>          # Request is coming from the other server.
>          # Ignore busy objects to avoid race condition.
>          set req.hash_ignore_busy = 1;
>          set req.backend = appserver;
>      } else {
>          set req.http.X-Via-Varnish = "true";
>      }
> }
>
> # Server 2
> sub vcl_recv {
>      set req.backend = other_varnish;
>      if (req.http.X-Via-Varnish || !req.backend.healthy) {
>          # Request is coming from the other server.
>          set req.backend = appserver;
>      } else {
>          set req.http.X-Via-Varnish = "true";
>      }
> }
>
> Laurence
>
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