nixos-servers/nix/machines/maestro.nix

{
  machines.maestro = {
    kind = "virtual";
    hypervisorName = "atlas";

    nixosModule = { config, ... }: {
      microvm.balloonMem = 10000;

      lab = {
        dockerSwarm.enable = true;

        vm = {
          id = 1;
        };
      };
    };
  };
}