configuration.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
      ./docker.nix
      ./prometheus.nix
      ./grafana.nix
      #./exim.nix
      #./gitlab-runner.nix
    ];

  # This value determines the NixOS release with which your system is to be
  # compatible, in order to avoid breaking some software such as database
  # servers. You should change this only after NixOS release notes say you
  # should.
  system.stateVersion = "17.09"; # Did you read the comment?

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  # boot.loader.grub.efiSupport = true;
  # boot.loader.grub.efiInstallAsRemovable = true;
  # boot.loader.efi.efiSysMountPoint = "/boot/efi";
  # Define on which hard drive you want to install Grub.
  # boot.loader.grub.device = "/dev/sda"; # or "nodev" for efi only

  # networking.hostName = "nixos"; # Define your hostname.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
  networking.usePredictableInterfaceNames = false;

  # Select internationalisation properties.
  i18n = {
    consoleFont = "Lat2-Terminus16";
    consoleKeyMap = "us";
    defaultLocale = "en_US.UTF-8";
  };

  # Set your time zone.
  time.timeZone = "UTC";

  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages = with pkgs; [
    inetutils
    mtr
    sysstat
    vim
    wget
    curl
    htop
    mosh
    tmux
    fail2ban
    nix-repl
    git
    parallel
    youtube-dl
  ];
  programs.vim.defaultEditor= true;

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.bash.enableCompletion = true;
  # programs.mtr.enable = true;
  # programs.gnupg.agent = { enable = true; enableSSHSupport = true; };

  # List services that you want to enable:
  

  # Enable the OpenSSH daemon.
  services.openssh = {
    enable = true;
    permitRootLogin = "no";
    passwordAuthentication = false;
    ports = [ 5510 ]; # appends to allowedTCPPorts
  };
  
  services.ntp.enable = true;


  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  networking.hostName = "neon.d6e.io";
  networking.firewall = {
    enable = true;
    allowPing = true;
    allowedTCPPorts = [];
  };
  programs.mosh.enable = true; # opens port 60000 to 61000

  # Enable CUPS to print documents.
  # services.printing.enable = true;

  # Enable the X11 windowing system.
  # services.xserver.enable = true;
  # services.xserver.layout = "us";
  # services.xserver.xkbOptions = "eurosign:e";

  # Enable touchpad support.
  # services.xserver.libinput.enable = true;

  # Enable the KDE Desktop Environment.
  # services.xserver.displayManager.sddm.enable = true;
  # services.xserver.desktopManager.plasma5.enable = true;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  # users.extraUsers.guest = {
  #   isNormalUser = true;
  #   uid = 1000;
  # };
  
  users.extraUsers.d6e = {
    isNormalUser = true;
    home = "/home/d6e";
    extraGroups = [ "wheel" "docker" ];
    initialPassword = "changeme";
    openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK1gRLFVCsa9B7S2eEXJpggTgLSZ6kqkbHGJy7MYlgab kr-phone@d6e.io" 
    ];
  };
  

  # Auto GC every morning
  nix.gc.automatic = false;
  services.cron.systemCronJobs = [ "0 3 * * * root /etc/admin/optimize-nix" ];
  services.nixosManual.enable = true;
  
  environment.etc =
  {
    "admin/optimize-nix" =
    {
      text =
      ''
        #!/run/current-system/sw/bin/bash
        set -eu
  
        # Delete everything from this profile that isn't currently needed
        nix-env --delete-generations old
  
        # Delete generations older than a week
        nix-collect-garbage
        nix-collect-garbage --delete-older-than 7d
  
        # Optimize
        nix-store --gc --print-dead
        nix-store --optimise
      '';
      mode = "0774";
    };
  };


}