Environment variables in VCL

[Bender, Charles]

Looking at a VCL I use to set hostname and this seems to work-

sub vcl_deliver {
  set resp.http.X-Cache-Node = server.hostname;
}

Maybe you can use in form of server.environmental_variable

From: varnish-misc <varnish-misc-bounces+charles=beachcamera.com at varnish-cache.org> on behalf of Hugues Alary <hugues at betabrand.com>
Date: Monday, September 9, 2019 at 6:09 PM
To: varnish-misc <varnish-misc at varnish-cache.org>
Subject: Environment variables in VCL

Hi there,

I'm using Varnish in a Kubernetes cluster and my configuration needs to use environment variables.

More specifically, I'm trying to declare a `backend` with a `.host` whose value is an environment variable.

backend b0 {
  .host = "$ENVIRONMENT_VARIABLE_HOSTNAME";
  .port = "80";
  .connect_timeout = 300s;
  .first_byte_timeout = 300s;
  .between_bytes_timeout = 300s;
}

This doesn't work. It tried using the std.get_env() function but it doesn't work in this context.

Is there any way to use environment variables in VCL, or do I have to create a configuration template?

Thanks for your help,

Cheers,
-Hugues

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