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[Bug 1787534] [NEW] DNS extension broken for provider networks

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Public bug reported:

Following these instructions:
https://docs.openstack.org/neutron/queens/install/controller-install-option1-ubuntu.html

Plus these:
https://docs.openstack.org/neutron/queens/admin/config-dns-int.html

makes my neutron-server crash on startup with this error:

2018-08-17 08:42:02.306 800458 ERROR neutron.api.extensions [req-afd067df-249f-4092-9bf5-ca660b11292d - - - - -] Unable to process extensions (auto-allocated-topology, dns-integration) because the configured plugins do not satisfy their requirements. Some features will not work as expected.
2018-08-17 08:42:02.306 800458 ERROR neutron.service [req-afd067df-249f-4092-9bf5-ca660b11292d - - - - -] Unrecoverable error: please check log for details.: ExtensionsNotFound: Extensions not found: ['auto-allocated-topology', 'dns-integration'].
2018-08-17 08:42:02.306 800458 ERROR neutron.service Traceback (most recent call last):
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/service.py", line 86, in serve_wsgi
2018-08-17 08:42:02.306 800458 ERROR neutron.service     service.start()
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/service.py", line 62, in start
2018-08-17 08:42:02.306 800458 ERROR neutron.service     self.wsgi_app = _run_wsgi(self.app_name)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/service.py", line 289, in _run_wsgi
2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = config.load_paste_app(app_name)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/common/config.py", line 122, in load_paste_app
2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = loader.load_app(app_name)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/oslo_service/wsgi.py", line 353, in load_app
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return deploy.loadapp("config:%s" % self.config_path, name=name)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return loadobj(APP, uri, name=name, **kw)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return context.create()
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return self.object_type.invoke(self)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2018-08-17 08:42:02.306 800458 ERROR neutron.service     **context.local_conf)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 55, in fix_call
2018-08-17 08:42:02.306 800458 ERROR neutron.service     val = callable(*args, **kw)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 31, in urlmap_factory
2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = loader.get_app(app_name, global_conf=global_conf)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 350, in get_app
2018-08-17 08:42:02.306 800458 ERROR neutron.service     name=name, global_conf=global_conf).create()
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return self.object_type.invoke(self)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2018-08-17 08:42:02.306 800458 ERROR neutron.service     **context.local_conf)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 55, in fix_call
2018-08-17 08:42:02.306 800458 ERROR neutron.service     val = callable(*args, **kw)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/auth.py", line 47, in pipeline_factory
2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = loader.get_app(pipeline[-1])
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 350, in get_app
2018-08-17 08:42:02.306 800458 ERROR neutron.service     name=name, global_conf=global_conf).create()
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return self.object_type.invoke(self)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 146, in invoke
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return fix_call(context.object, context.global_conf, **context.local_conf)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 55, in fix_call
2018-08-17 08:42:02.306 800458 ERROR neutron.service     val = callable(*args, **kw)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/api/v2/router.py", line 25, in _factory
2018-08-17 08:42:02.306 800458 ERROR neutron.service     return pecan_app.v2_factory(global_config, **local_config)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/pecan_wsgi/app.py", line 47, in v2_factory
2018-08-17 08:42:02.306 800458 ERROR neutron.service     startup.initialize_all()
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/pecan_wsgi/startup.py", line 41, in initialize_all
2018-08-17 08:42:02.306 800458 ERROR neutron.service     ext_mgr.extend_resources("2.0", attributes.RESOURCE_ATTRIBUTE_MAP)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/api/extensions.py", line 376, in extend_resources
2018-08-17 08:42:02.306 800458 ERROR neutron.service     self._check_faulty_extensions(unloadable_extensions)
2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/api/extensions.py", line 396, in _check_faulty_extensions
2018-08-17 08:42:02.306 800458 ERROR neutron.service     extensions=list(faulty_extensions))
2018-08-17 08:42:02.306 800458 ERROR neutron.service ExtensionsNotFound: Extensions not found: ['auto-allocated-topology', 'dns-integration'].


Basically trying to have basic DNS resolution with provider-only networks (no l3 router) makes neutron crash. I don't know if that is accepted behaviour, but anyway it should be documented that this configuration is not possible.

I'm using queens on Ubuntu 16 via their cloud archive, deployment done
by hand.


See also:
https://ask.openstack.org/en/question/99865/has-anyone-seen-extensions-not-found-auto-allocated-topology-dns-integration-when-you-add-dns-to-the-ml2-extension_drivers/ (where an outdated fix is proposed as a code change)


-----------------------------------
Release: 12.0.4.dev63 on 2018-08-14 12:30
SHA: 7acefb0c7fbb5057879a2edadd43423275993bc3
Source: https://git.openstack.org/cgit/openstack/neutron/tree/doc/source/admin/config-dns-int.rst
URL: https://docs.openstack.org/neutron/queens/admin/config-dns-int.html

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1787534

Title:
  DNS extension broken for provider networks

Status in neutron:
  New

Bug description:
  Following these instructions:
  https://docs.openstack.org/neutron/queens/install/controller-install-option1-ubuntu.html

  Plus these:
  https://docs.openstack.org/neutron/queens/admin/config-dns-int.html

  makes my neutron-server crash on startup with this error:

  2018-08-17 08:42:02.306 800458 ERROR neutron.api.extensions [req-afd067df-249f-4092-9bf5-ca660b11292d - - - - -] Unable to process extensions (auto-allocated-topology, dns-integration) because the configured plugins do not satisfy their requirements. Some features will not work as expected.
  2018-08-17 08:42:02.306 800458 ERROR neutron.service [req-afd067df-249f-4092-9bf5-ca660b11292d - - - - -] Unrecoverable error: please check log for details.: ExtensionsNotFound: Extensions not found: ['auto-allocated-topology', 'dns-integration'].
  2018-08-17 08:42:02.306 800458 ERROR neutron.service Traceback (most recent call last):
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/service.py", line 86, in serve_wsgi
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     service.start()
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/service.py", line 62, in start
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     self.wsgi_app = _run_wsgi(self.app_name)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/service.py", line 289, in _run_wsgi
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = config.load_paste_app(app_name)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/common/config.py", line 122, in load_paste_app
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = loader.load_app(app_name)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/oslo_service/wsgi.py", line 353, in load_app
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return deploy.loadapp("config:%s" % self.config_path, name=name)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return loadobj(APP, uri, name=name, **kw)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return context.create()
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return self.object_type.invoke(self)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 144, in invoke
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     **context.local_conf)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 55, in fix_call
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     val = callable(*args, **kw)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 31, in urlmap_factory
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = loader.get_app(app_name, global_conf=global_conf)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 350, in get_app
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     name=name, global_conf=global_conf).create()
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return self.object_type.invoke(self)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 144, in invoke
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     **context.local_conf)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 55, in fix_call
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     val = callable(*args, **kw)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/auth.py", line 47, in pipeline_factory
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     app = loader.get_app(pipeline[-1])
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 350, in get_app
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     name=name, global_conf=global_conf).create()
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 710, in create
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return self.object_type.invoke(self)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 146, in invoke
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return fix_call(context.object, context.global_conf, **context.local_conf)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/paste/deploy/util.py", line 55, in fix_call
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     val = callable(*args, **kw)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/api/v2/router.py", line 25, in _factory
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     return pecan_app.v2_factory(global_config, **local_config)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/pecan_wsgi/app.py", line 47, in v2_factory
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     startup.initialize_all()
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/pecan_wsgi/startup.py", line 41, in initialize_all
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     ext_mgr.extend_resources("2.0", attributes.RESOURCE_ATTRIBUTE_MAP)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/api/extensions.py", line 376, in extend_resources
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     self._check_faulty_extensions(unloadable_extensions)
  2018-08-17 08:42:02.306 800458 ERROR neutron.service   File "/usr/lib/python2.7/dist-packages/neutron/api/extensions.py", line 396, in _check_faulty_extensions
  2018-08-17 08:42:02.306 800458 ERROR neutron.service     extensions=list(faulty_extensions))
  2018-08-17 08:42:02.306 800458 ERROR neutron.service ExtensionsNotFound: Extensions not found: ['auto-allocated-topology', 'dns-integration'].

  
  Basically trying to have basic DNS resolution with provider-only networks (no l3 router) makes neutron crash. I don't know if that is accepted behaviour, but anyway it should be documented that this configuration is not possible.

  I'm using queens on Ubuntu 16 via their cloud archive, deployment done
  by hand.

  
  See also:
  https://ask.openstack.org/en/question/99865/has-anyone-seen-extensions-not-found-auto-allocated-topology-dns-integration-when-you-add-dns-to-the-ml2-extension_drivers/ (where an outdated fix is proposed as a code change)

  
  -----------------------------------
  Release: 12.0.4.dev63 on 2018-08-14 12:30
  SHA: 7acefb0c7fbb5057879a2edadd43423275993bc3
  Source: https://git.openstack.org/cgit/openstack/neutron/tree/doc/source/admin/config-dns-int.rst
  URL: https://docs.openstack.org/neutron/queens/admin/config-dns-int.html

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