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diff --git a/bin/nova-instance-usage-audit b/bin/nova-instance-usage-audit
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+#!/usr/bin/env python
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright (c) 2011 Openstack, LLC.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""Cron script to generate usage notifications for instances existing
+   during the audit period.
+
+   Together with the notifications generated by compute on instance
+   create/delete/resize, over that time period, this allows an external
+   system consuming usage notification feeds to calculate instance usage
+   for each tenant.
+
+   Time periods are specified as 'hour', 'month', 'day' or 'year'
+
+   hour = previous hour. If run at 9:07am, will generate usage for 8-9am.
+   month = previous month. If the script is run April 1, it will generate
+           usages for March 1 through March 31.
+   day = previous day. if run on July 4th, it generates usages for July 3rd.
+   year = previous year. If run on Jan 1, it generates usages for
+        Jan 1 through Dec 31 of the previous year.
+"""
+
+import datetime
+import gettext
+import os
+import sys
+import time
+import traceback
+
+# If ../nova/__init__.py exists, add ../ to Python search path, so that
+# it will override what happens to be installed in /usr/(local/)lib/python...
+POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
+                                   os.pardir,
+                                   os.pardir))
+if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
+    sys.path.insert(0, POSSIBLE_TOPDIR)
+
+gettext.install('nova', unicode=1)
+import nova.compute.utils
+from nova import context
+from nova import db
+from nova import exception
+from nova import flags
+from nova import log as logging
+from nova import rpc
+from nova import utils
+
+
+FLAGS = flags.FLAGS
+
+if __name__ == '__main__':
+    admin_context = context.get_admin_context()
+    flags.parse_args(sys.argv)
+    logging.setup()
+    begin, end = utils.last_completed_audit_period()
+    print "Starting instance usage audit"
+    print "Creating usages for %s until %s" % (str(begin), str(end))
+    instances = db.instance_get_active_by_window_joined(admin_context,
+                                                        begin,
+                                                        end)
+    print "Found %d instances" % len(instances)
+    for instance_ref in instances:
+        try:
+            nova.compute.utils.notify_usage_exists(
+                    admin_context, instance_ref,
+                    ignore_missing_network_data=False)
+        except Exception, e:
+            print traceback.format_exc(e)
+    print "Instance usage audit completed"