Problem Upgrade to Varnish 4.1 - Multiple Backends Not Working

[Guillaume Quintard]

What does "stop working" mean? Does the vcl fail to compile? do you receive
503s? does it open a portal to an ancient dimension filled with unspoken
nightmares? Help us help you.

-- 
Guillaume Quintard

On Fri, Sep 23, 2016 at 1:52 PM, Drew, AJ <Drew.AJ at principal.com> wrote:

> Hello,
>
> We are trying to upgrade to Varnish 4.1 from Varnish 3.0.5.
>
> Most things are working fine, but a big problem we are running into is
> that we have multiple backends.  We switch backends based on URLs.  This
> was working fine in Varnish 3, but when we switched over to Varnish 4, it
> stopped working.
>
> I have tried many variations of the URLs, and even simplified the
> directors so that they only contain one backend (in my tests) so that I
> could switch from trying the backend directly to trying the director.
>
> Using either of the options does not seem to matter.
>
> Has anyone else run into this problem?
>
> Here are the sections of my VCL that contain the backends / director
> definitions and the if statements to switch.  I have also left in the
> different options (lines) I have used to come up with different
> combinations for testing.
>
> probe B_probe {
>         .request =
>         "GET  /zzzzzz/status.php HTTP/1.1"
>         "HOST: xxxxxx.example.com"
>         "Connection: close";
>         .timeout   = 0.3 s;
>         .window    = 8;
>         .threshold = 7;
> }
>
> backend B_backend1 {
>         .host = "162.131.196.220";
>         .port = "8080";
>         .probe = B_probe;
> }
>
> backend syscheck {
> #        .host = "localhost";
>         .host = "127.0.0.1";
>         .port = "8081";
> }
>
> backend searchBackend {
>         .host = "rp.www.example.com";
>         .port = "80";
> }
>
> backend providerBackend {
>         .host = "172.23.82.28";
>         .port = "80";
> }
>
> sub vcl_init {
>         new examplehosts = directors.round_robin();
>         examplehosts.add_backend(B_backend1);
>
>         new examplesyscheck = directors.round_robin();
>         examplesyscheck.add_backend(syscheck);
> }
>
>
>
>
> sub vcl_recv {
>
> #       set req.backend_hint = examplehosts.backend();
>         set req.backend_hint = B_backend1;
>
>         if (req.url ~ "^/syscheck/.*$") {
> #       if (req.url ~ "^/syscheck/*") {
> #       if (req.url ~ "^/syscheck/") {
>                 set req.backend_hint = syscheck;
> #               set req.backend_hint = examplesyscheck.backend();
>                 return(pass);
>         }
>
>         # Add simple health check for upstream load balancers
>         if (req.url ~ "^/health-check") {
>                 return( synth(200, "UP"));
>         }
> ...
>
>
> Thanks!
>
> A J Drew
>
>
>
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