{
  description = "A very basic flake";
  inputs = {

    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
    colmena = {
      url = "github:zhaofengli/colmena";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nixos-generators = {
      url = "github:nix-community/nixos-generators";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, colmena, nixos-generators, ... }:
    let pkgs = nixpkgs.legacyPackages.x86_64-linux;
    in {

      packages.x86_64-linux.hello = pkgs.hello;

      packages.x86_64-linux.default = colmena.packages.x86_64-linux.colmena;

      packages.x86_64-linux.register = let
        lxc = nixos-generators.nixosGenerate {
          pkgs = pkgs;
          modules = [ ./machines/base.nix ];
          format = "lxc";
        };
        metadata = nixos-generators.nixosGenerate {
          pkgs = pkgs;
          modules = [ ./machines/base.nix ];
          format = "lxc-metadata";
        };
      in with import nixpkgs { system = "x86_64-linux"; };
      stdenv.mkDerivation {
        name = "register-lxc-container";
        buildInputs = [ ];
        src = self;
        buildPhase =
          "mkdir -p $out; ln -s ${lxc} $out/lxc; ln -s ${metadata} $out/metadata";
        installPhase = ''
          ln -s $out/lxc/tarball/nixos-system-x86_64-linux.tar.xz $out/lxc.tar.xz; 
          ln -s $out/metadata/tarball/nixos-system-x86_64-linux.tar.xz $out/metadata.tar.xz;
        '';
      };

      colmena = {
        meta = { nixpkgs = import nixpkgs { system = "x86_64-linux"; }; };
        nginx = {
          imports = [ ./machines/nginx.nix ];
          deployment.targetHost = "10.21.150.250";
        };

        nginx2 = {
          imports = [ ./machines/nginx.nix ];
          deployment.targetHost = "10.21.150.95";
        };
      };

      devShells.x86_64-linux.default = pkgs.mkShell {
        buildInputs = [ colmena.packages.x86_64-linux.colmena ];
      };

    };
}