I hit this issue whilst testing some updates for xenial-pike today:
2017-10-11 18:16:50.106231 mod_wsgi (pid=10696): Exception occurred processing WSGI script '/usr/bin/keystone-wsgi-public'.
2017-10-11 18:16:50.106249 Traceback (most recent call last):
2017-10-11 18:16:50.106261 File "/usr/bin/keystone-wsgi-public", line 51, in <module>
2017-10-11 18:16:50.106275 application = initialize_public_application()
2017-10-11 18:16:50.106291 File "/usr/lib/python2.7/dist-packages/keystone/server/wsgi.py", line 134, in initialize_public_application
2017-10-11 18:16:50.106301 config_files=_get_config_files())
2017-10-11 18:16:50.106306 File "/usr/lib/python2.7/dist-packages/keystone/server/wsgi.py", line 66, in initialize_application
2017-10-11 18:16:50.106313 startup_application_fn=loadapp)
2017-10-11 18:16:50.106318 File "/usr/lib/python2.7/dist-packages/keystone/server/common.py", line 47, in setup_backends
2017-10-11 18:16:50.106325 drivers = backends.load_backends()
2017-10-11 18:16:50.106329 File "/usr/lib/python2.7/dist-packages/keystone/server/backends.py", line 61, in load_backends
2017-10-11 18:16:50.106336 token_provider_api=token.provider.Manager())
2017-10-11 18:16:50.106340 File "/usr/lib/python2.7/dist-packages/keystone/common/dependency.py", line 96, in __wrapped_init__
2017-10-11 18:16:50.106347 init(self, *args, **kwargs)
2017-10-11 18:16:50.106351 File "/usr/lib/python2.7/dist-packages/keystone/common/dependency.py", line 155, in wrapper
2017-10-11 18:16:50.106358 self.__wrapped_init__(*args, **kwargs)
2017-10-11 18:16:50.106362 File "/usr/lib/python2.7/dist-packages/keystone/token/provider.py", line 73, in __init__
2017-10-11 18:16:50.106519 super(Manager, self).__init__(CONF.token.provider)
2017-10-11 18:16:50.106533 File "/usr/lib/python2.7/dist-packages/keystone/common/manager.py", line 169, in __init__
2017-10-11 18:16:50.106589 self.driver = load_driver(self.driver_namespace, driver_name)
2017-10-11 18:16:50.106596 File "/usr/lib/python2.7/dist-packages/keystone/common/manager.py", line 75, in load_driver
2017-10-11 18:16:50.106609 raise ImportError(msg, {'name': driver_name, 'namespace': namespace})
2017-10-11 18:16:50.106634 ImportError: (u'Unable to find %(name)r driver in %(namespace)r.', {'namespace': 'keystone.token.provider', 'name': 'keystone.token.providers.uuid.Provider'})
Switching the keystone.conf to use the 'uuid' entry point resolves this issue, but I'm bemused as to why this has started happening (as I already had an environment deployed on pike prior to redeployment)
https:/