Multiple instances of varnish

[Hettwer, Marian]

On 05.05.11 19:00, "david raistrick" <drais at icantclick.org> wrote:

>On Thu, 5 May 2011, Mike Franon wrote:
>
>> I am trying to see if there is a way with using a single instance
>>
>> 1)  Varnish using VCL to recognize that it is a bot
>>
>> 2)  If it is a bot request, varnish will then use a different backend.
>
>Sure.  You don't need multiple varnishes for this.
>
>Define your backend, create a rule that matches on the headers you're
>matching on, set the backend.
>
>I don't have anything that matches on user agents (which is what I assume
>you're looking at on the F5), and I'm not going to look at the docs to
>find out how to match on them, but an example that does the same thing
>for 
>URIs:

If the F5 is able to recognize a bot, let it just insert a custom http
header (X-F5-Found-Bot or something like that) and later match in vcl_recv
on this header.

Pretty much like this:

sub vcl_recv {
 if (req.http.X-F5-Found-Bot) {
  set req.backend = backendforbots;
	}
}



HTH,
Marian