Hi Guillermo,
> So, going back to the point, there is any way of configuring the host
> to use for a request, without it being defined in the backends
> section? I can generate the IP if needed.
I usually use perl code to generate the VCL, that way can just generate the
backend selector
if (req.http.X-Panel = "1") {
set req.backend = server1;
} else if (req.http.X-Panel = "2") {
set req.backend = server2;
....
An alternative is the VSLP director I have written. I haven't published it yet,
as I have quite a lot of open tickets with patches I proposed, and I don't see
much value in preparing patches if the core developers don't have enough
resources to review them. The director is ready, I am using it in production on
a high traffic site.
In
http://lists.varnish-cache.org/pipermail/varnish-dev/2010-March/002420.html
I have described the basic design.
IIUC, the VSLP director would do what you need. VCL inline code would look
something like
C{
if (get_server_for_url) {
/* pseudo-VCL: set dir.key =
get_server_for_url(req.url) */
VRT_l_dir_key_int(sp,
get_server_for_url(VRT_r_req_url(sp)));
}
}C
Server selection is then as
server = key % nservers
nserver being the number of servers, plus additional logic when the server is
down etc.
Nils
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