nixos.server/modules/hosts/server02/server02Configuration.nix

{...}: {
  flake.nixosModules.server02Configuration = {...}: {
    networking = {
      hostName = "server02";
    };
    virtualisation.docker.enable = true;
    swapDevices = [
      {
        device = "/swapfile";
        size = 16 * 1024;
      }
    ];
  };
}