Add Davids Server to machines.

machines/DavidsServer/configuration.nix

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+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{
+  imports = [
+      ./hardware-configuration.nix
+    ];
+
+  system.autoUpgrade.enable = false;
+
+  programs.zsh.promptInit = "PROMPT='%(!.%{$fg_bold[red]%}.%{$fg_bold[magenta]%}%n@)%m %{$fg_bold[green]%}%(!.%1~.%~) $(git_prompt_info)%_$(prompt_char)%{$reset_color%} '";
+  # This value determines the NixOS release with which your system is to be
+  # compatible, in order to avoid breaking some software such as database
+  # servers. You should change this only after NixOS release notes say you
+  # should.
+  system.stateVersion = "19.03";
+}

machines/DavidsServer/options.nix

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+{ lib, ... }:
+
+with lib;
+
+{
+  imports = [
+    ../../options/machine.nix
+  ];
+
+  config.machine = rec {
+    hostName = "DavidsServer";
+    administrators = [ { name = "david"; id = 1000; } ];
+    mailAccounts = [ "david" ];
+    domain = "davids-planet.de";
+    allowUnfree = true;
+    conffiles = [
+      "security"
+      "zsh"
+    ];
+    pkgs = [
+      "base"
+      "server"
+    ];
+    services = [
+      "fail2ban"
+      "mailserver"
+      "mariaDB"
+      "nextcloud"
+      "nginx"
+      "openssh"
+    ];
+    vHosts = (let base = domain; in [
+      { domain = base; service = "nextcloud"; }
+      { domain = "mail.${base}"; service = "mail"; }
+    ]);
+    firewall = {
+      allowPing = false;
+      allowedUDPPorts = [ 22 80 443 ];
+      allowedTCPPorts = [ 80 443 ];
+      allowedUDPPortRanges = [];
+      allowedTCPPortRanges = [];
+    };
+  };
+}