kubenix/docs/content/examples/namespaces/module.nix

{
  config,
  lib,
  pkgs,
  kubenix,
  ...
}: {
  imports = with kubenix.modules; [submodules k8s];

  # Import submodule.
  submodules.imports = [
    ./namespaced.nix
  ];

  # We can now create multiple submodule instances.
  submodules.instances.namespace-http = {
    #                  ~~~~~~~~~~~~~~
    #                          ^
    #  ╭-----------------------╯
    # The submodule instance name is injected as the name attribute to
    # the submodule function. In this example, it is used as the namespace
    # name.
    #
    # This needs to match config.submodule.name of an imported submodule.
    submodule = "namespaced";
    # Now we can set the args options defined in the submodule.
    args.kubernetes.resources = {
      services.nginx.spec = {
        ports = [
          {
            name = "http";
            port = 80;
          }
        ];
        selector.app = "nginx";
      };
    };
  };

  submodules.instances.namespace-https = {
    submodule = "namespaced";
    args.kubernetes.resources = {
      services.nginx.spec = {
        ports = [
          {
            name = "https";
            port = 443;
          }
        ];
        selector.app = "nginx";
      };
    };
    # Example of how other defaults can be applied to resources
    # within a submodule.
    args.kubernetes.version = "1.26";
  };

  # Resources defined in parent context use namespace set at this
  # level and are not affected by the above submodules.
  kubernetes.namespace = "default";
  kubernetes.resources.services.nginx.spec = {
    selector.app = "nginx-default";
  };
}