NixOS examples

With the power of the NixOS options, you can customize all the parts of your system without having to switch between contexts / different configuration paradigms / languages.

You can share variables in the Nix configuration across the different components

e.g. when configuring server, the domain name and specific service ports can be defined at the top of the configuration file and then reused everywhere
this removes duplication in your system configuration

Boot opions

Latest kernel + kernel parameter + systemd-boot instead of grub

{
  boot.kernelPackages = pkgs.linuxPackages_latest;
  boot.kernelParams = [ "amd_pstate=active" ];
  boot.loader.systemd-boot.enable = true;
}

System packages

Packages available to all system users:

{
  environment.systemPackages = with pkgs; [
    gnome.seahorse
    sshfs
  ]
}

User management

{
  users.users.tom = {
    isNormalUser = true;
    description = "T.K.";
    extraGroups = [ "networkmanager" "wheel" "video" ];
  };

  users.users.nixremote = {
    isNormalUser = true;
     openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFa5xTjWp9+btqQ0hkJiU3gys0xD3/uCXK48ZbzlMvjL"
    ];
  };
}

Install hardware drivers

{
  hardware.bluetooth.enable = true;
  hardware.opengl.enable = true;
}

Installing fonts

{
  fonts.packages = with pkgs; [
    font-awesome
    nerdfonts
    cantarell-fonts
    iosevka
  ];
}

Networking

{
  networking = {
    hostName = "ideapad";
    networkmanager.enable = true;
    networkmanager.dns = "none";
    nameservers = [ "127.0.0.1" "::1" ];
  };
}

Enable services

SSH

{
  services.openssh = {
    enable = true;
    settings.PasswordAuthentication = false;
  };
}

Builtin services

Nix Options

{
  services.fstrim.enable = true;
  services.printing.enable = true;
  services.gnome.gnome-keyring.enable = true;
  services.blueman.enable = true;
  services.dnscrypt-proxy2.enable = true;
}

Custom systemd service

{
  systemd.services.suspend = {
    description = "User suspend actions";
    before = [ "sleep.target" ];
    wantedBy = [ "sleep.target" ];
    serviceConfig = {
      ExecStart = "systemd-run --user --machine=tom@ ${pkgs.swaylock}/bin/swaylock";
      ExecStartPost = "${pkgs.coreutils}/bin/sleep 1";
    };
  };
}

Custom systemd timer

{
  systemd.timers.inadyn = {
    description = "Sync ddns every ${cfg.period}";
    wantedBy = [ "default.target" ];
    timerConfig = {
      OnBootSec = "2m";
      OnUnitActiveSec = cfg.period;
    };
  };
}

Experiment without fear!

different kernels + kernel arguments
different gpu drivers
different OpenCL + Vulkan implementations
kernel modules (zram + zswap)
power management
custom cpu microcode updates
custom dns server
get rid of x11
...

when you're done... you're done!

Nix Intro