Environment variables in VCL

[Hugues Alary]

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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