Varnish - set backend if statuscode is 404

[Norberto Meijome]

+1, this is how we do this ( and similar tricks)

@per, you suggested saint mode. Why? What would it do better than Tobias'
solution?

Thx,
On 29/11/2013 3:10 AM, "Tobias Honacker" <t.honacker at googlemail.com> wrote:

> Hi Jan,
>
> This is my solution:
>
> sub vcl_recv {
>
> // Redirect 404er Pictures - vcl_fetch will restart request and set new
> header to match with this rule
> if (req.http.host == "new-header.de") {
>        if (req.url ~ "^/var/storage/images") {
>            set req.backend = new_backend;
>        }
>         }
> }
>
>
> sub vcl_fetch {
>
>         if ((beresp.status == 404) && (req.url ~ "^/var/storage/images")) {
>      set req.http.Host = "new-header.de";
>      return(restart);
>         }
> }
>
>
> You have to set a new header and restart the request thats it.
>
>
> Best regards,
> Tobias
>
> Am 28.11.13 16:15 schrieb "Jan-Frode Myklebust" unter <janfrode at tanso.net
> >:
>
> >If you manage to do this, I would much appreciate you post a recipie :-)
> >I've been struggeling trying to achieve the same thing, without
> >success..
> >
> >Actually my setup is a bit different, we have a director, and just want
> >to check the other backend if the first backend gives 404, but the same
> >solution might apply.
> >
> >backend backend1 {
> >        .host = "backend1.example.com";
> >        .probe = {
> >                .url = "/alive.html";
> >                .timeout = 34 ms;
> >                .interval = 2s;
> >                .window = 10;
> >                .threshold = 8;
> >        }
> >}
> >backend backend2 {
> >        .host = "backend2.example.com";
> >        .probe = {
> >                .url = "/alive.html";
> >                .timeout = 34 ms;
> >                .interval = 2s;
> >                .window = 10;
> >                .threshold = 8;
> >        }
> >}
> >director dir1 client {
> >    { .backend = backend1; .weight = 1; }
> >    { .backend = backend2; .weight = 1; }
> >}
> >sub vcl_recv {
> >        if ( req.http.host ~ "(?i)www.example.com$"  ) {
> >                set req.backend = dir1;
> >                return(lookup);
> >        }
> >}
> >
> >
> >
> >  -jf
>
>
>
> _______________________________________________
> varnish-misc mailing list
> varnish-misc at varnish-cache.org
> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.varnish-cache.org/lists/pipermail/varnish-misc/attachments/20131129/4a0d74e9/attachment.html>