root@maas-server-eden:/var/log/maas# cat celery.log
[2014-09-03 12:02:31,496: INFO/MainProcess] beat: Shutting down...
[2014-09-03 12:04:24,628: WARNING/MainProcess] /usr/lib/python2.7/dist-packages/celery/apps/worker.py:159: CDeprecationWarning:
Starting from version 3.2 Celery will refuse to accept pickle by default.

The pickle serializer is a security concern as it may give attackers
the ability to execute any command.  It's important to secure
your broker from unauthorized access when using pickle, so we think
that enabling pickle should require a deliberate action and not be
the default choice.

If you depend on pickle then you should set a setting to disable this
warning and to be sure that everything will continue working
when you upgrade to Celery 3.2::

    CELERY_ACCEPT_CONTENT = ['pickle', 'json', 'msgpack', 'yaml']

You must only enable the serializers that you will actually use.


  warnings.warn(CDeprecationWarning(W_PICKLE_DEPRECATED))
[2014-09-03 12:04:24,644: INFO/Beat] beat: Starting...
[2014-09-03 12:04:24,649: INFO/MainProcess] Connected to amqp://maas_workers@172.21.42.1:5672//maas_workers
[2014-09-03 12:04:24,655: INFO/MainProcess] mingle: searching for neighbors
[2014-09-03 12:04:24,813: INFO/Beat] Scheduler: Sending due task unconditional-dhcp-lease-upload (provisioningserver.tasks.upload_dhcp_leases)
[2014-09-03 12:04:24,883: INFO/Beat] Scheduler: Sending due task report-boot-images (provisioningserver.tasks.report_boot_images)
[2014-09-03 12:04:24,884: INFO/Beat] Scheduler: Sending due task probe-dhcp-servers (provisioningserver.tasks.periodic_probe_dhcp)
[2014-09-03 12:04:25,662: INFO/MainProcess] mingle: all alone
[2014-09-03 12:04:25,691: WARNING/MainProcess] /usr/lib/python2.7/dist-packages/kombu/pidbox.py:75: UserWarning: A node named celery@maas-server-eden is already using this process mailbox!

Maybe you forgot to shutdown the other node or did not do so properly?
Or if you meant to start multiple nodes on the same host please make sure
you give each node a unique node name!

  warnings.warn(W_PIDBOX_IN_USE.format(node=self))
[2014-09-03 12:04:25,714: WARNING/MainProcess] celery@maas-server-eden ready.
[2014-09-03 12:04:25,715: INFO/MainProcess] Received task: provisioningserver.tasks.refresh_secrets[d426986f-ca3c-4e3f-9a9c-d60d73ab3a4c]
[2014-09-03 12:04:25,715: INFO/MainProcess] Received task: provisioningserver.tasks.refresh_secrets[90560c79-fcea-432a-a1d7-52cc3d4a8a89]
[2014-09-03 12:04:25,715: INFO/MainProcess] Received task: provisioningserver.tasks.refresh_secrets[e2d541df-bffd-423b-b598-d1dab6f573c9]
[2014-09-03 12:04:25,716: INFO/MainProcess] Received task: provisioningserver.tasks.upload_dhcp_leases[cb4b23df-8a9d-4cc2-b4a5-39d00dda4994] expires:[2014-09-03 10:05:24.814515+00:00]
[2014-09-03 12:04:25,716: INFO/MainProcess] Received task: provisioningserver.tasks.report_boot_images[e4edfd82-6f73-4e6e-8f00-eaa6367fbb0f] expires:[2014-09-03 10:09:24.884186+00:00]
[2014-09-03 12:04:25,717: INFO/MainProcess] Received task: provisioningserver.tasks.periodic_probe_dhcp[0fd214a0-d4e0-48e9-8e96-f47ac5169772] expires:[2014-09-03 10:05:24.884736+00:00]
[2014-09-03 12:04:27,697: INFO/MainProcess] Task provisioningserver.tasks.refresh_secrets[90560c79-fcea-432a-a1d7-52cc3d4a8a89] succeeded in 0.002019968s: None
[2014-09-03 12:04:27,697: INFO/MainProcess] Task provisioningserver.tasks.refresh_secrets[e2d541df-bffd-423b-b598-d1dab6f573c9] succeeded in 0.002427829s: None
[2014-09-03 12:04:27,697: INFO/MainProcess] Task provisioningserver.tasks.refresh_secrets[d426986f-ca3c-4e3f-9a9c-d60d73ab3a4c] succeeded in 0.002710175s: None
[2014-09-03 12:04:28,181: ERROR/Worker-4] upload_dhcp_leases: HTTP Error 500: INTERNAL SERVER ERROR
[2014-09-03 12:04:28,310: ERROR/MainProcess] Task provisioningserver.tasks.upload_dhcp_leases[cb4b23df-8a9d-4cc2-b4a5-39d00dda4994] raised unexpected: IOError()
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/celery/app/trace.py", line 218, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/celery/app/trace.py", line 398, in __protected_call__
    return self.run(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/tasks.py", line 99, in wrapper
    func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/tasks.py", line 315, in upload_dhcp_leases
    upload_leases()
  File "/usr/lib/python2.7/dist-packages/provisioningserver/dhcp/leases.py", line 192, in upload_leases
    process_leases(timestamp, leases)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/dhcp/leases.py", line 178, in process_leases
    send_leases(leases)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/dhcp/leases.py", line 172, in send_leases
    api_path, 'update_leases', leases=json.dumps(leases))
  File "/usr/lib/python2.7/dist-packages/apiclient/maas_client.py", line 250, in post
    url, method="POST", headers=headers, data=body)
  File "/usr/lib/python2.7/dist-packages/apiclient/maas_client.py", line 116, in dispatch_query
    res = urllib2.urlopen(req)
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError
[2014-09-03 12:04:28,331: INFO/MainProcess] Task provisioningserver.tasks.report_boot_images[e4edfd82-6f73-4e6e-8f00-eaa6367fbb0f] succeeded in 0.636378908s: None
[2014-09-03 12:04:34,198: INFO/MainProcess] Task provisioningserver.tasks.periodic_probe_dhcp[0fd214a0-d4e0-48e9-8e96-f47ac5169772] succeeded in 6.50298166s: None