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[Bug 1802041] Re: Failed to publish message to topic 'nova': 'NoneType' object has no attribute '__getitem__'

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Hmm, nova-api is failing to RPC cast to the nova-conductor service. What
is the value of the [conductor]/topic configuration option in nova.conf?
It should be 'conductor'. Do you have it set to 'nova'?

https://docs.openstack.org/nova/queens/configuration/config.html#conductor.topic

Otherwise yeah check the rabbitmq server and configured transport_urls.

https://docs.openstack.org/nova/queens/configuration/config.html#DEFAULT.transport_url

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

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https://bugs.launchpad.net/bugs/1802041

Title:
  Failed to publish message to topic 'nova': 'NoneType' object has no
  attribute '__getitem__'

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Hello, I am an OpenStack user. I have problem when I launched an
  instance via horizon, I got a notification:

  Unexpected API Error. Please report this at
  http://bugs.launchpad.net/nova/ and attach the Nova API log if
  possible. <class 'oslo_messaging.exceptions.MessageDeliveryFailure'>
  (HTTP 500) (Request-ID: req-d5a176bf-4d55-4b07-b405-c5eeb8080b77)

  
  Nova API Log:

  2018-11-07 10:33:56.795 10976 ERROR oslo.messaging._drivers.impl_rabbit [req-d5a176bf-4d55-4b07-b405-c5eeb8080b77 5fd9267fddb54b638b2129db881353dc b35ae77fe5724f829dd01e0488ca8bc5 - default default] Failed to publish message to topic 'nova': 'NoneType' object has no attribute '__getitem__'
  2018-11-07 10:33:56.796 10976 ERROR oslo.messaging._drivers.impl_rabbit [req-d5a176bf-4d55-4b07-b405-c5eeb8080b77 5fd9267fddb54b638b2129db881353dc b35ae77fe5724f829dd01e0488ca8bc5 - default default] Unable to connect to AMQP server on 172.28.0.12:5672 after None tries: 'NoneType' object has no attribute '__getitem__'
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi [req-d5a176bf-4d55-4b07-b405-c5eeb8080b77 5fd9267fddb54b638b2129db881353dc b35ae77fe5724f829dd01e0488ca8bc5 - default default] Unexpected exception in API method: MessageDeliveryFailure: Unable to connect to AMQP server on 172.28.0.12:5672 after None tries: 'NoneType' object has no attribute '__getitem__'
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi Traceback (most recent call last):
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/openstack/wsgi.py", line 788, in wrapped
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return f(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     return func(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/servers.py", line 554, in create
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     **create_kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/hooks.py", line 154, in inner
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     rv = f(*args, **kwargs)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1649, in create
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     tags=tags, supports_multiattach=supports_multiattach)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1180, in _create_instance
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     tags=tags)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/conductor/api.py", line 136, in schedule_and_build_instances
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     block_device_mapping, tags)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/conductor/rpcapi.py", line 400, in schedule_and_build_instances
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     cctxt.cast(context, 'schedule_and_build_instances', **kw)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 152, in cast
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     self.transport._send(self.target, msg_ctxt, msg, retry=self.retry)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 131, in _send
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     timeout=timeout, retry=retry)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 559, in send
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     retry=retry)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 545, in _send
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     msg=msg, timeout=timeout, retry=retry)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py", line 1272, in topic_send
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     retry=retry)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py", line 1155, in _ensure_publishing
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     self.ensure(method, retry=retry, error_callback=_error_callback)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py", line 825, in ensure
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi     raise exceptions.MessageDeliveryFailure(msg)
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi MessageDeliveryFailure: Unable to connect to AMQP server on 172.28.0.12:5672 after None tries: 'NoneType' object has no attribute '__getitem__'
  2018-11-07 10:33:56.797 10976 ERROR nova.api.openstack.wsgi 
  2018-11-07 10:33:56.799 10976 INFO nova.api.openstack.wsgi [req-d5a176bf-4d55-4b07-b405-c5eeb8080b77 5fd9267fddb54b638b2129db881353dc b35ae77fe5724f829dd01e0488ca8bc5 - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'oslo_messaging.exceptions.MessageDeliveryFailure'>

  
  Environment:
  - CentOS 7
  - OpenStack Queens
  - Nova 17.0.5

  
  I don't know how to solve it. I am looking forward to being instructed. Thank you.

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