{
  services.hydra = {
    enable = true;
    hydraURL = "http://localhost:3000";
    notificationSender = "hydra@localhost";
    # buildMachinesFiles = [];
    useSubstitutes = true;
  };
  nix.buildMachines = [
   { hostName = "localhost";
     system = "x86_64-linux";
     supportedFeatures = ["kvm" "nixos-test" "big-parallel" "benchmark"];
     maxJobs = 8;
   }
 ];
}