I've been very happy with nixos-generators: https://github.com/nix-community/nixos-generators https://github.com/nix-community/nixos-generators They let you p

I've been very happy with nixos-generators: https://github.com/nix-community/nixos-generators https://github.com/nix-community/nixos-generators They let you produce SD-card images with custom NixOS'es. Very useful when you want an exact software layout, and exact system settings, like what user accounts and SSH keys to include, what systemd services should run, what directories should be tmpfs, and how to interact with the local network using avahi.