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diff --git a/nixos/modules/virtualisation/nova.nix b/nixos/modules/virtualisation/nova.nix
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+++ b/nixos/modules/virtualisation/nova.nix
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+# Module for Nova, a.k.a. OpenStack Compute.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  cfg = config.virtualisation.nova;
+
+  nova = pkgs.nova;
+
+  novaConf = pkgs.writeText "nova.conf"
+    ''
+      --nodaemon
+      --verbose
+      ${cfg.extraConfig}
+    '';
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    virtualisation.nova.enableSingleNode =
+      mkOption {
+        default = false;
+        description =
+          ''
+            This option enables Nova, also known as OpenStack Compute,
+            a cloud computing system, as a single-machine
+            installation.  That is, all of Nova's components are
+            enabled on this machine, using SQLite as Nova's database.
+            This is useful for evaluating and experimenting with Nova.
+            However, for a real cloud computing environment, you'll
+            want to enable some of Nova's services on other machines,
+            and use a database such as MySQL.
+          '';
+      };
+
+    virtualisation.nova.extraConfig =
+      mkOption {
+        default = "";
+        description =
+          ''
+            Additional text appended to <filename>nova.conf</filename>,
+            the main Nova configuration file.
+          '';
+      };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enableSingleNode {
+
+    environment.systemPackages = [ nova pkgs.euca2ools pkgs.novaclient ];
+
+    environment.etc =
+      [ { source = novaConf;
+          target = "nova/nova.conf";
+        }
+      ];
+
+    # Nova requires libvirtd and RabbitMQ.
+    virtualisation.libvirtd.enable = true;
+    services.rabbitmq.enable = true;
+
+    # `qemu-nbd' required the `nbd' kernel module.
+    boot.kernelModules = [ "nbd" ];
+
+    system.activationScripts.nova =
+      ''
+        mkdir -m 755 -p /var/lib/nova
+        mkdir -m 755 -p /var/lib/nova/networks
+        mkdir -m 700 -p /var/lib/nova/instances
+        mkdir -m 700 -p /var/lib/nova/keys
+
+        # Allow the CA certificate generation script (called by
+        # nova-api) to work.
+        mkdir -m 700 -p /var/lib/nova/CA /var/lib/nova/CA/private
+
+        # Initialise the SQLite database.
+        ${nova}/bin/nova-manage db sync
+      '';
+
+    # `nova-api' receives and executes external client requests from
+    # tools such as euca2ools.  It listens on port 8773 (XML) and 8774
+    # (JSON).
+    jobs.nova_api =
+      { name = "nova-api";
+
+        description = "Nova API service";
+
+        startOn = "ip-up";
+
+        # `openssl' is required to generate the CA.  `openssh' is
+        # required to generate key pairs.
+        path = [ pkgs.openssl pkgs.openssh pkgs.bash ];
+
+        respawn = false;
+
+        exec = "${nova}/bin/nova-api --flagfile=${novaConf} --api_paste_config=${nova}/etc/nova/api-paste.ini";
+      };
+
+    # `nova-objectstore' is a simple image server.  Useful if you're
+    # not running the OpenStack Imaging Service (Swift).  It serves
+    # images placed in /var/lib/nova/images/.
+    jobs.nova_objectstore =
+      { name = "nova-objectstore";
+
+        description = "Nova simple object store service";
+
+        startOn = "ip-up";
+
+        preStart =
+          ''
+            mkdir -m 700 -p /var/lib/nova/images
+          '';
+
+        exec = "${nova}/bin/nova-objectstore --flagfile=${novaConf}";
+      };
+
+    # `nova-scheduler' schedules VM execution requests.
+    jobs.nova_scheduler =
+      { name = "nova-scheduler";
+
+        description = "Nova scheduler service";
+
+        startOn = "ip-up";
+
+        exec = "${nova}/bin/nova-scheduler --flagfile=${novaConf}";
+      };
+
+    # `nova-compute' starts and manages virtual machines.
+    jobs.nova_compute =
+      { name = "nova-compute";
+
+        description = "Nova compute service";
+
+        startOn = "ip-up";
+
+        path =
+          [ pkgs.sudo pkgs.vlan pkgs.nettools pkgs.iptables pkgs.qemu_kvm
+            pkgs.e2fsprogs pkgs.utillinux pkgs.multipath_tools pkgs.iproute
+            pkgs.bridge_utils
+          ];
+
+        exec = "${nova}/bin/nova-compute --flagfile=${novaConf}";
+      };
+
+    # `nova-network' manages networks and allocates IP addresses.
+    jobs.nova_network =
+      { name = "nova-network";
+
+        description = "Nova network service";
+
+        startOn = "ip-up";
+
+        path =
+          [ pkgs.sudo pkgs.vlan pkgs.dnsmasq pkgs.nettools pkgs.iptables
+            pkgs.iproute pkgs.bridge_utils pkgs.radvd
+          ];
+
+        exec = "${nova}/bin/nova-network --flagfile=${novaConf}";
+      };
+
+  };
+
+}