How to have a minimal NixOS?

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4

You can get rid of most fluff with something like this:

{
  imports = [
    <nixpkgs/nixos/modules/profiles/headless.nix>
    <nixpkgs/nixos/modules/profiles/minimal.nix>
  ];

  # only add strictly necessary modules
  boot.initrd.includeDefaultModules = false;
  boot.initrd.kernelModules = [ "ext4" ... ];
  disabledModules =
    [ <nixpkgs/nixos/modules/profiles/all-hardware.nix>
      <nixpkgs/nixos/modules/profiles/base.nix>
    ];

  # disable useless software
  environment.defaultPackages = [];
  xdg.icons.enable  = false;
  xdg.mime.enable   = false;
  xdg.sounds.enable = false;
}
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