[Bug 1268783] [NEW] traceback in celery-region log when maas controls DNS and tries to write dns config

[Jeff Lane]

Public bug reported:

Using latest trusty bits I manually created a node in the MAAS UI.  On
setting the node, MAAS successfully powered the node on via IPMI.  The
node booted and got an IP address but then failed to PXE due to PXE
timeout errors.  While all this is going on, each retry prompted a new
DHCP lease which seems to have triggered a DNS update.  The celery
region log showed this each time DNS config was attempted:

[2014-01-13 18:26:20,751: INFO/MainProcess] Got task from broker: provisioningserver.tasks.write_full_dns_config[f67e9cfd-34e5-4cf8-abf1-b01d4ea01919]
[2014-01-13 18:26:20,791: INFO/MainProcess] Task provisioningserver.tasks.write_full_dns_config[f67e9cfd-34e5-4cf8-abf1-b01d4ea01919] succeeded in 0.0343019962311s: None
[2014-01-13 18:26:20,797: INFO/MainProcess] Got task from broker: provisioningserver.tasks.rndc_command[0f41c14f-5d56-4811-9743-359451260a06]
[2014-01-13 18:26:20,834: ERROR/MainProcess] Task provisioningserver.tasks.rndc_command[0f41c14f-5d56-4811-9743-359451260a06] raised exception: UnpickleableExceptionWrapper('provisioningserver.utils', 'ExternalProcessError', (), 'ExternalProcessError()')
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/celery/execute/trace.py", line 181, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/tasks.py", line 186, in rndc_command
    execute_rndc_command(arguments)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/dns/config.py", line 152, in execute_rndc_command
    call_and_check(rndc_cmd, stdout=devnull)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/utils.py", line 119, in call_and_check
    return subprocess.check_call(command, *args, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)
ExternalProcessError: ExternalProcessError()

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: maas 1.4+bzr1789+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-2.17-generic 3.13.0-rc7
Uname: Linux 3.13.0-2-generic x86_64
ApportVersion: 2.13.1-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jan 13 18:35:55 2014
InstallationDate: Installed on 2014-01-13 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140113)
PackageArchitecture: all
SourcePackage: maas
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1268783

Title:
  traceback in celery-region log when maas controls DNS and tries to
  write dns config

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