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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1278104

Title:
  Docker cannot start a new instance because of an internal error

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Cannot create new instances because of an internal error. It seems
  like that the docker client returns None instead of a empty array if
  not a single container is started.

  Update:
  The root cause for the issue is that the docker v1.8 rest API doesn't longer deliver the container list for v1.4 api calls. We must upgrade to >= 1.7 in order to make the docker driver working again.

  Additional does docker not set the Content-Type correctly. The docker client expects that the Content-Type is application/json but it is plain/text. The parsing of the content will be skipped in this case.
  Please see also: https://github.com/dotcloud/docker/pull/3974

  Stacktrace:
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup   File "/opt/stack/nova/nova/compute/manager.py", line 821, in init_host
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup     self._destroy_evacuated_instances(context)
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup   File "/opt/stack/nova/nova/compute/manager.py", line 532, in _destroy_evacuated_instances
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup     local_instances = self._get_instances_on_driver(context, filters)
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup   File "/opt/stack/nova/nova/compute/manager.py", line 511, in _get_instances_on_driver
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup     driver_instances = self.driver.list_instances()
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup   File "/opt/stack/nova/nova/virt/docker/driver.py", line 96, in list_instances
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup     for container in self.docker.list_containers():
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup TypeError: 'NoneType' object is not iterable
  2014-02-09 15:01:44.077 TRACE nova.openstack.common.threadgroup

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