anchor.diff:  
     networking = {
       hostName = "k0";
  -    extraHosts = ''
  -    '';
  +    extraHosts = "";
   
       defaultGateway = "192.168.0.1";
       nameservers = [ "8.8.8.8" ];
  
positive.code: { config, pkgs, ... }:
  
  {
    imports =
      [
        ../extra.nix
        ./hardware-configuration.nix
        ../k8s-master.nix
      ];
  
    boot.loader.systemd-boot.enable = true;
    boot.loader.efi.canTouchEfiVariables = true;
  
    # See https://askubuntu.com/a/863301 (this fixes flooding of the kernel logs
    # with "printk messages dropped".
    boot.kernelParams = ["pcie_aspm=off"];
  
    boot.initrd.luks.devices = {
      luksroot = {
        device = "/dev/disk/by-id/nvme-SAMSUNG_MZVKW512HMJP-000H1_S34CNA0J100907-part2";
        preLVM = true;
      };
    };
  
negative.code:   # Enable cron service
    services.cron = {
      enable = true;
      systemCronJobs =
        [ "* * * * *      l     zsh -l -c ~/syscfg/script/export-agenda.sh" ];
    };
  
    services.xserver = {
  