Installing on Raspberry PI 3B

Initial Configuration

• Download SD Image from Hydra.

• Allow main development system to build derivations off of its machine emulating aarch64 architecture so as to not choke out the Raspberry PI. to main development system to build derivations off the machine to not choke out the PI.

# configuration.nix

boot.binfmt.emulatedSystems = [ "aarch64-linux" ];

Build Configuration

• Build the configuration on your workstation and take note of the store path that is ouputted.

nix build .#nixosConfigurations.beer.config.system.build.toplevel --print-out-paths

# Example Path
/nix/store/randomarbitraryhashavc-nixos-system-beer-23.05.20230626.ab3331

Initial Install

• Boot SD Image on PI and make sure SSH is accessible
• Copy the built files over to the PI

nix copy [the path above] --to ssh://root@[pi]

• Install NixOS on the PI

nixos-install --root / --system [the path above]

Subsequent Installs

Use the remote rebuild functionality of nixos-rebuild

NIX_SSHOPTS="-t -p 22" nixos-rebuild switch --flake .#beer --target-host remoteuser@beer --use-remote-sudo