devos/doc/concepts/hosts.md

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# Hosts
Nix flakes contain an output called `nixosConfigurations` declaring an
attribute set of valid NixOS systems. To create hosts, you can use the
`nixos.hosts` argument and pass `modules` to each host. Host-specific modules
typically go in the `hosts` folder of the template.
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Each host should follow a certain channel to define the `pkgs` of that host.
You can use the `nixos.hostDefaults` to set defaults and global modules for all
hosts.
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For each host, the configuration automatically sets the `networking.hostName`
attribute to the name of the host. This is for convenience, since `nixos-rebuild`
automatically searches for a configuration matching the current systems hostname
if one is not specified explicitly.
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It is recommended that the host modules only contain configuration information
specific to a particular piece of hardware. Anything reusable across machines
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is best saved for [profile modules](./profiles.md).
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This is a good place to import sets of profiles, called [suites](./suites.md),
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that you intend to use on your machine.
Additionally, you can pass modules from [nixos-hardware][nixos-hardware] in the
`modules` argument for relevant hosts.
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## Example
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hosts/librem.nix:
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```nix
{ suites, hardware, ... }:
{
imports = suites.laptop ++ [ hardware.purism-librem-13v3 ];
boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;
fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
}
```
flake.nix
```nix
{
nixos.hosts.librem = {
system = "aarch64-linux";
modules = ./hosts/librem.nix;
};
}
```
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[nixos-hardware]: https://github.com/NixOS/nixos-hardware