diff --git a/stress/driver.py b/stress/driver.py
new file mode 100644
index 0000000..b68825e
--- /dev/null
+++ b/stress/driver.py
@@ -0,0 +1,206 @@
+# Copyright 2011 Quanta Research Cambridge, Inc.
+#
+#    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.
+"""The entry point for the execution of a workloadTo execute a workload.
+Users pass in a description of the workload and a nova manager object
+to the bash_openstack function call"""
+
+
+import random
+import datetime
+import time
+
+
+# local imports
+from test_case import *
+from state import State
+import utils.util
+from config import StressConfig
+
+# setup logging to file
+logging.basicConfig(
+    format='%(asctime)s %(name)-20s %(levelname)-8s %(message)s',
+    datefmt='%m-%d %H:%M:%S',
+    filename="stress.debug.log",
+    filemode="w",
+    level=logging.DEBUG,
+    )
+
+# define a Handler which writes INFO messages or higher to the sys.stdout
+_console = logging.StreamHandler()
+_console.setLevel(logging.INFO)
+# set a format which is simpler for console use
+_formatter = logging.Formatter('%(name)-20s: %(levelname)-8s %(message)s')
+# tell the handler to use this format
+_console.setFormatter(_formatter)
+# add the handler to the root logger
+logging.getLogger('').addHandler(_console)
+
+
+def _create_cases(choice_spec):
+    """
+    Generate a workload of tests from workload description
+    """
+    cases = []
+    count = 0
+    for choice in choice_spec:
+        p = choice.probability
+        for i in range(p):
+            cases.append(choice)
+        i = i + p
+        count = count + p
+    assert(count == 100)
+    return cases
+
+
+def _get_compute_nodes(keypath, user, controller):
+    """
+    Returns a list of active compute nodes. List is generated by running
+    nova-manage on the controller.
+    """
+    nodes = []
+    if keypath == None or user == None:
+        return nodes
+    lines = utils.util.ssh(keypath, user, controller,
+                     "nova-manage service list | grep ^nova-compute").\
+                     split('\n')
+    # For example: nova-compute xg11eth0 nova enabled :-) 2011-10-31 18:57:46
+    # This is fragile but there is, at present, no other way to get this info.
+    for line in lines:
+        words = line.split()
+        if len(words) > 0 and words[4] == ":-)":
+            nodes.append(words[1])
+    return nodes
+
+
+def _error_in_logs(keypath, logdir, user, nodes):
+    """
+    Detect errors in the nova log files on the controller and compute nodes.
+    """
+    grep = 'egrep "ERROR\|TRACE" %s/*.log' % logdir
+    for node in nodes:
+        errors = utils.util.ssh(keypath, user, node, grep, check=False)
+        if len(errors) > 0:
+            logging.error('%s: %s' % (node, errors))
+            return True
+    return False
+
+
+def bash_openstack(manager,
+                   choice_spec,
+                   **kwargs):
+    """
+    Workload driver. Executes a workload as specified by the `choice_spec`
+    parameter against a nova-cluster.
+
+    `manager`  : Manager object
+    `choice_spec` : list of BasherChoice actions to run on the cluster
+    `kargs`       : keyword arguments to the constructor of `test_case`
+                    `duration`   = how long this test should last (3 sec)
+                    `sleep_time` = time to sleep between actions (in msec)
+                    `test_name`  = human readable workload description
+                                   (default: unnamed test)
+                    `max_vms`    = maximum number of instances to launch
+                                   (default: 32)
+                    `seed`       = random seed (default: None)
+    """
+    # get keyword arguments
+    duration = kwargs.get('duration', datetime.timedelta(seconds=10))
+    seed = kwargs.get('seed', None)
+    sleep_time = float(kwargs.get('sleep_time', 3000)) / 1000
+    max_vms = int(kwargs.get('max_vms', 32))
+    test_name = kwargs.get('test_name', 'unamed test')
+
+    stress_config = StressConfig(manager.config._conf)
+    keypath = stress_config.host_private_key_path
+    user = stress_config.host_admin_user
+    logdir = stress_config.nova_logdir
+    computes = _get_compute_nodes(keypath, user, manager.config.identity.host)
+    utils.util.execute_on_all(keypath, user, computes,
+                              "rm -f %s/*.log" % logdir)
+    random.seed(seed)
+    cases = _create_cases(choice_spec)
+    test_end_time = time.time() + duration.seconds
+    state = State(max_vms=max_vms)
+
+    retry_list = []
+    last_retry = time.time()
+    cooldown = False
+    logcheck_count = 0
+    test_succeeded = True
+    logging.debug('=== Test \"%s\" on %s ===' %
+                  (test_name, time.asctime(time.localtime())))
+    for kw in kwargs:
+        logging.debug('\t%s = %s', kw, kwargs[kw])
+
+    while True:
+        if not cooldown:
+            if time.time() < test_end_time:
+                case = random.choice(cases)
+                logging.debug('Chose %s' % case)
+                retry = case.invoke(manager, state)
+                if retry != None:
+                    retry_list.append(retry)
+            else:
+                logging.info('Cooling down...')
+                cooldown = True
+        if cooldown and len(retry_list) == 0:
+            if _error_in_logs(keypath, logdir, user, computes):
+                test_succeeded = False
+            break
+        # Retry verifications every 5 seconds.
+        if time.time() - last_retry > 5:
+            logging.debug('retry verifications for %d tasks', len(retry_list))
+            new_retry_list = []
+            for v in retry_list:
+                if not v.retry():
+                    new_retry_list.append(v)
+            retry_list = new_retry_list
+            last_retry = time.time()
+        time.sleep(sleep_time)
+        # Check error logs after 100 actions
+        if logcheck_count > 100:
+            if _error_in_logs(keypath, logdir, user, computes):
+                test_succeeded = False
+                break
+            else:
+                logcheck_count = 0
+        else:
+            logcheck_count = logcheck_count + 1
+    # Cleanup
+    logging.info('Cleaning up: terminating virtual machines...')
+    vms = state.get_instances()
+    active_vms = [v for _k, v in vms.iteritems() if v and v[1] == 'ACTIVE']
+    for target in active_vms:
+        manager.servers_client.delete_server(target[0]['id'])
+        # check to see that the server was actually killed
+    for target in active_vms:
+        kill_id = target[0]['id']
+        i = 0
+        while True:
+            try:
+                manager.servers_client.get_server(kill_id)
+            except Exception:
+                break
+            i += 1
+            if i > 60:
+                raise
+            time.sleep(1)
+        logging.info('killed %s' % kill_id)
+        state.delete_instance_state(kill_id)
+
+    if test_succeeded:
+        logging.info('*** Test succeeded ***')
+    else:
+        logging.info('*** Test had errors ***')
+    return test_succeeded