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nixpkgs/nixos/doc/manual/development/non-switchable-systems.section.md
Janne Heß fcc95ff817 treewide: Fix all Nix ASTs in all markdown files 
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Non Switchable Systems

In certain systems, most notably image based appliances, updates are handled outside the system. This means that you do not need to rebuild your configuration on the system itself anymore.

If you want to build such a system, you can use the image-based-appliance profile:

{ modulesPath, ... }: {
  imports = [ "${modulesPath}/profiles/image-based-appliance.nix" ];
}

The most notable deviation of this profile from a standard NixOS configuration is that after building it, you cannot switch to the configuration anymore. The profile sets config.system.switch.enable = false;, which excludes switch-to-configuration, the central script called by nixos-rebuild, from your system. Removing this script makes the image lighter and slightly more secure.