{ pkgs ? import <nixpkgs> {} }:
let
  # Pin the deployment package-set to a specific version of nixpkgs
  # pkgs = import (builtins.fetchTarball {
  #   url = "https://github.com/NixOS/nixpkgs/archive/e6377ff35544226392b49fa2cf05590f9f0c4b43.tar.gz";
  #   sha256 = "1fra9wwy5gvj5ibayqkzqpwdf715bggc0qbmrfch4fghwvl5m70l";
  # }) {};
  # pkgs = import <nixpkgs> {};

  nodes = import ./nodes.nix;

  compute = {
    deployment.tags = [ "compute" "c0" "cluster" ];

    fileSystems = {
      "/users" = {
        device = "172.16.239.222:/home";
        fsType = "nfs4";
        options = [
          "soft"
          "defaults"
          "noauto"
          "x-systemd.automount"
        ];
      };
    };

    systemd.automounts = [
      {
        where = "/users";
        wantedBy = [ "default.target" ];
      }
    ];
  };

  mkCompute = host:
  let
    hw = ./hardware-configuration.d + "/${host.name}.nix";
  in {
    "${host.name}" = {
      cluster = {
        compute = true;
        k8sNode = true;
        mounts = {
          rdma.enable = false;
          automount.enable = true;
          users = true;
          opt = true;
          work = false;
          data = false;
          ceph = false;
        };
      };

      features = {
        host = {
          name = host.name;
          address = host.address;
        };
        os.externalInterface = "enp65s0f0";
        hpc.compute = true;
        # hpc.knem = true;
      };

      deployment.targetHost = host.address;

      # services.udev.extraRules = ''
      #   KERNEL=="ibp1s0", SUBSYSTEM=="net", ATTR{create_child}:="0x7666"
      # '';

      networking = {
        hostName = host.name;
        useDHCP = false;
        interfaces. enp65s0f0 = {
          useDHCP = false;
          ipv4.addresses = [ {
            address = host.address;
            prefixLength = 24;
          } ];
          # ipv4.routes = [ {
          #   address = "10.255.242.0";
          #   prefixLength = 24;
          #   via = "10.255.241.100";
          # } ];

        };
        # interfaces."ibp1s0.7666" = {
        # interfaces."ibp1s0" = {
        #   useDHCP = false;
        #   ipv4.addresses = [ {
        #     address = host.ipoib;
        #     prefixLength = 24;
        #   } ];
        # };
      };
      imports = [
          hw
          ../default.nix
          ../mounts.nix
          #./kernel.nix
      ];
    }
    // compute;
};
in builtins.foldl' (a: n: a // mkCompute n) {} nodes