configuration2.nix

{ config, pkgs, ... }:

{ 

  imports = [ <nixpkgs/nixos/modules/installer/virtualbox-demo.nix> 	
];	

  programs.fish.enable = true;
  
  environment.systemPackages = [
    pkgs.docker_compose
    pkgs.git
  ];

  virtualisation.docker.enable = true;
  swapDevices = [{device="/var/swap/";size=2048;}];
  
  systemd.services.cluster = {
    path = [pkgs.bash pkgs.docker_compose];
    serviceConfig = {
      ExecStart = "${pkgs.bash}/bin/bash /home/demo/server/on_start.sh";
    };
    wantedBy = [ "default.target" ];
  };
 
  systemd.services.cluster.enable = true;
  
}