* Add a module for setting up a basic (single-node) OpenStack Compute

(Nova) cloud.

svn path=/nixos/trunk/; revision=26664

modules/module-list.nix

@@ -171,5 +171,6 @@
   ./tasks/swraid.nix
   ./tasks/tty-backgrounds.nix
   ./virtualisation/libvirtd.nix
+  ./virtualisation/nova.nix
   ./virtualisation/xen-dom0.nix
 ]

modules/virtualisation/nova.nix

@@ -0,0 +1,131 @@
+# Module for Nova, a.k.a. OpenStack Compute.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  cfg = config.virtualisation.nova;
+
+  nova = pkgs.nova;
+
+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.
+          '';
+      };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enableSingleNode {
+
+    environment.systemPackages = [ nova ];
+
+    environment.etc =
+      [ # The Paste configuration file for nova-api.
+        { source = "${nova}/etc/nova/nova-api.conf";
+          target = "nova/nova-api.conf";
+        }
+      ];
+
+    # Nova requires libvirtd and RabbitMQ.
+    virtualisation.libvirtd.enable = true;
+    services.rabbitmq.enable = true;
+
+    # `qemu-nbd' required the `nbd' kernel module.
+    boot.kernelModules = [ "nbd" ];
+      
+    # `nova-api' receives and executes external client requests from
+    # tools such as euca2ools.  It listens on port 8773 (XML) and 8774
+    # (JSON).
+    jobs.nova_api =
+      { name = "nova-api";
+
+        description = "Nova API service";
+
+        startOn = "ip-up";
+
+        exec = "${nova}/bin/nova-api";
+      };
+
+    # `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";
+
+        exec = "${nova}/bin/nova-objectstore --nodaemon";
+      };
+
+    # `nova-scheduler' schedules VM execution requests.
+    jobs.nova_scheduler =
+      { name = "nova-scheduler";
+
+        description = "Nova scheduler service";
+
+        startOn = "ip-up";
+
+        exec = "${nova}/bin/nova-scheduler --nodaemon --verbose";
+      };
+
+    # `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
+          ];
+
+        exec = "${nova}/bin/nova-compute --nodaemon --verbose";
+      };
+
+    # `nova-network' manages networks and allocates IP addresses.
+    jobs.nova_network =
+      { name = "nova-network";
+
+        description = "Nova network service";
+
+        startOn = "ip-up";
+
+        path =
+          [ pkgs.sudo pkgs.vlan pkgs.dnsmasq pkgs.nettools pkgs.iptables
+            pkgs.iproute pkgs.bridge_utils pkgs.radvd
+          ];
+
+        exec = "${nova}/bin/nova-network --nodaemon --verbose";
+      };
+
+  };
+
+}