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[Adam Gandelman <1476402@xxxxxxxxxxxxxxxxxx>]

This is a nova bug introduced /w
https://review.openstack.org/#/c/102649/  that prevents instances from
booting unless their network has an ipv4 subnet.  Instances on a network
that only have a single ipv6 subnet will fail on this AttributeError

** Summary changed:

- appliance fails to spawn, AttributeError: 'NoneType' object has no attribute 'get'
+ boot fails on network /w only an ipv6 subnet, AttributeError: 'NoneType' object has no attribute 'get'

** Also affects: nova
   Importance: Undecided
       Status: New

** Changed in: akanda
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1476402

Title:
  boot fails on network /w only an ipv6 subnet, AttributeError:
  'NoneType' object has no attribute 'get'

Status in akanda:
  Invalid
Status in OpenStack Compute (nova):
  New

Bug description:
  On rug startup, the devstack-created router appliance fails to spawn
  with the following traceback in nova:

  ams': None})]| from (pid=17775) _allocate_network_async /opt/stack/nova/nova/compute/manager.py:1527
  2015-07-20 14:07:26.462 ERROR nova.compute.manager [req-057f87b7-b0b5-45e7-b6f8-5c6cbb7a2be0 neutron service] [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7] Instance failed to spawn
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7] Traceback (most recent call last):
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]   File "/opt/stack/nova/nova/compute/manager.py", line 2110, in _build_resources
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]     yield resources
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]   File "/opt/stack/nova/nova/compute/manager.py", line 1982, in _build_and_run_instance
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]     block_device_info=block_device_info)
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 2409, in spawn
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]     admin_pass=admin_password)
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 2882, in _create_image
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]     content=files, extra_md=extra_md, network_info=network_info)
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]   File "/opt/stack/nova/nova/api/metadata/base.py", line 156, in __init__
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]     self.network_metadata = netutils.get_network_metadata(network_info)
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]   File "/opt/stack/nova/nova/virt/netutils.py", line 229, in get_network_metadata
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7]     if subnet_v4.get('ips'):
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7] AttributeError: 'NoneType' object has no attribute 'get'
  2015-07-20 14:07:26.462 TRACE nova.compute.manager [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7] 
  2015-07-20 14:07:26.464 INFO nova.compute.manager [req-057f87b7-b0b5-45e7-b6f8-5c6cbb7a2be0 neutron service] [instance: 2e5ff228-9d7b-436a-8053-6fcd11b02eb7] Terminating instance

  A little digging shows that this recently merged into nova and is
  likely the cause of the breakage:
  https://review.openstack.org/#/c/102649/

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