Update

raspberry-pi/rpi4-configuration.nix

@@ -0,0 +1,51 @@
+{ config, pkgs, lib, ... }:
+
+{
+ # This configuration worked on 09-03-2021 nixos-unstable @ commit 102eb68ceec
+ # The image used https://hydra.nixos.org/build/134720986
+
+  boot = {
+    kernelPackages = pkgs.linuxPackages_rpi4;
+    tmpOnTmpfs = true;
+    initrd.availableKernelModules = [ "usbhid" "usb_storage" ];
+    # ttyAMA0 is the serial console broken out to the GPIO
+    kernelParams = [
+        "8250.nr_uarts=1"
+        "console=ttyAMA0,115200"
+        "console=tty1"
+        # A lot GUI programs need this, nearly all wayland applications
+        "cma=128M"
+    ];
+  };
+
+  boot.loader.raspberryPi = {
+    enable = true;
+    version = 4;
+  };
+  boot.loader.grub.enable = false;
+
+  # Required for the Wireless firmware
+  hardware.enableRedistributableFirmware = true;
+
+  networking = {
+    hostName = "nixos-raspi-4"; # Define your hostname.
+    networkmanager = {
+      enable = true;
+    };
+  };
+
+  nix = {
+    autoOptimiseStore = true;
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 30d";
+    };
+    # Free up to 1GiB whenever there is less than 100MiB left.
+    extraOptions = ''
+      min-free = ${toString (100 * 1024 * 1024)}
+      max-free = ${toString (1024 * 1024 * 1024)}
+    '';
+  };
+  system.stateVersion = "20.09";
+}

server/test-configuration.nix

@@ -0,0 +1,37 @@
+{ pkgs, ... }: # A pinned version of Nixpkgs passed to the configuration by Nix
+
+{
+  # Enable Nix flakes and the unified Nix CLI
+  nix.settings = {
+    experimental-features = "nix-command flakes";
+  };
+
+  # Networking configuration
+  networking.hostName = "fedora-p1";
+
+  # Enable OpenSSH
+  services.openssh.enable = true;
+
+  # Root filesystem
+  fileSystems."/" = {
+    device = "/dev/sda1";
+    fsType = "ext4";
+  };
+
+  # Create a user
+  users.users.albert = {
+    isNormalUser = false;
+    initialPassword = "Password";
+  };
+
+  # CLI tools, language runtimes, shells, and other desired packages
+  environment.systemPackages = with pkgs; [
+    curl
+    jq
+    wget
+    git
+    python
+    openssl
+    zsh
+  ];
+}sssss