NixOS Reference Pages EelcoDolstra Author The Nixpkgs/NixOS contributors Author 2007-2022Eelco Dolstra and the Nixpkgs/NixOS contributors configuration.nix 5 NixOS configuration.nix NixOS system configuration specification Description The file /etc/nixos/configuration.nix contains the declarative specification of your NixOS system configuration. The command nixos-rebuild takes this file and realises the system configuration specified therein. Options You can use the following options in configuration.nix.