nixos-config/terranix/servers/config.nix

{ config, ... }:
let

  get = element: object: "\${ ${object."_ref"}.${element} }";

  getVariable = name: "\${ var.${name} }";

in {

  hcloud = {
    enable = true;

    resource.server."tinc_node" = {
      name = "tinc-node-nurnberg";
      image = "ubuntu-18.04";
      server_type = "cx11";
      backups = false;
      # datacenter = "nbg1-dc3";
      location = "nbg1";
      labels = { system = "nixos"; };
    };
  };

  output = {
    "${config.hcloud.resource.server."tinc_node".name}-ip4_address".value =
      get "ipv4_address" config.hcloud.resource.server."tinc_node";
    "${config.hcloud.resource.server."tinc_node".name}-ip6_address".value =
      get "ipv6_address" config.hcloud.resource.server."tinc_node";
  };

}