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1# Non Switchable Systems {#sec-non-switchable-system}
2
3In certain systems, most notably image based appliances, updates are handled
4outside the system. This means that you do not need to rebuild your
5configuration on the system itself anymore.
6
7If you want to build such a system, you can use the `image-based-appliance`
8profile:
9
10```nix
11{ modulesPath, ... }:
12{
13 imports = [ "${modulesPath}/profiles/image-based-appliance.nix" ];
14}
15```
16
17The most notable deviation of this profile from a standard NixOS configuration
18is that after building it, you cannot switch *to* the configuration anymore.
19The profile sets `config.system.switch.enable = false;`, which excludes
20`switch-to-configuration`, the central script called by `nixos-rebuild`, from
21your system. Removing this script makes the image lighter and slightly more
22secure.