63 lines
2 KiB
Markdown
63 lines
2 KiB
Markdown
# Hosts
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Nix flakes contain an output called `nixosConfigurations` declaring an
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attribute set of valid NixOS systems. To simplify the management and creation
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of these hosts, devos automatically imports every _.nix_ file inside this
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directory to the mentioned attribute set, applying the projects defaults to
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each. The only hard requirement is that the file contain a valid NixOS module.
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As an example, a file `hosts/system.nix` or `hosts/system/default.nix` will
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be available via the flake output `nixosConfigurations.system`. You can have
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as many hosts as you want and all of them will be automatically imported based
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on their name.
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For each host, the configuration automatically sets the `networking.hostName`
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attribute to the folder name or name of the file minus the _.nix_ extension. This
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is for convenience, since `nixos-rebuild` automatically searches for a configuration
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matching the current systems hostname if one is not specified explicitly.
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You can set channels, systems, and add extra modules to each host by editing the
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`nixos.hosts` argument in flake.nix. This is the perfect place to import
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host specific modules from external sources, such as the
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[nixos-hardware][nixos-hardware] repository.
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It is recommended that the host modules only contain configuration information
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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.
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## Example
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flake.nix:
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```nix
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{
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nixos = {
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imports = [ (devos.lib.importHosts ./hosts) ];
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hosts = {
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librem = {
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channelName = "latest";
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modules = [ nixos-hardware.nixosModules.purism-librem-13v3 ];
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};
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};
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};
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}
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```
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hosts/librem.nix:
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```nix
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{ suites, ... }:
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{
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imports = suites.laptop;
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boot.loader.systemd-boot.enable = true;
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boot.loader.efi.canTouchEfiVariables = true;
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fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
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}
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```
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[nixos-hardware]: https://github.com/NixOS/nixos-hardware
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