Cinder

cinder fails with default key_manager/backend

Bug #1721236 reported by Alfredo Moralejo on 2017-10-04

This bug affects 2 people

Affects		Status	Importance	Assigned to	Milestone
	Cinder	New	Undecided	Unassigned

Bug Description

When leaving default options in key_manager/backend and key_manager/api_class, cinder-api fails with error:

2017-10-02 15:38:43.555 21311 ERROR cinder Traceback (most recent call last):
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/bin/cinder-api", line 10, in <module>
2017-10-02 15:38:43.555 21311 ERROR cinder sys.exit(main())
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/cmd/api.py", line 60, in main
2017-10-02 15:38:43.555 21311 ERROR cinder server = service.WSGIService('osapi_volume')
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/service.py", line 547, in __init__
2017-10-02 15:38:43.555 21311 ERROR cinder self.app = self.loader.load_app(name)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/oslo_service/wsgi.py", line 353, in load_app
2017-10-02 15:38:43.555 21311 ERROR cinder return deploy.loadapp("config:%s" % self.config_path, name=name)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
2017-10-02 15:38:43.555 21311 ERROR cinder return loadobj(APP, uri, name=name, **kw)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 272, in loadobj
2017-10-02 15:38:43.555 21311 ERROR cinder return context.create()
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2017-10-02 15:38:43.555 21311 ERROR cinder return self.object_type.invoke(self)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2017-10-02 15:38:43.555 21311 ERROR cinder **context.local_conf)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 55, in fix_call
2017-10-02 15:38:43.555 21311 ERROR cinder val = callable(*args, **kw)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/__init__.py", line 43, in root_app_factory
2017-10-02 15:38:43.555 21311 ERROR cinder return paste.urlmap.urlmap_factory(loader, global_conf, **local_conf)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/urlmap.py", line 25, in urlmap_factory
2017-10-02 15:38:43.555 21311 ERROR cinder app = loader.get_app(app_name, global_conf=global_conf)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 350, in get_app
2017-10-02 15:38:43.555 21311 ERROR cinder name=name, global_conf=global_conf).create()
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2017-10-02 15:38:43.555 21311 ERROR cinder return self.object_type.invoke(self)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2017-10-02 15:38:43.555 21311 ERROR cinder **context.local_conf)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 55, in fix_call
2017-10-02 15:38:43.555 21311 ERROR cinder val = callable(*args, **kw)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/middleware/auth.py", line 57, in pipeline_factory
2017-10-02 15:38:43.555 21311 ERROR cinder app = loader.get_app(pipeline[-1])
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 350, in get_app
2017-10-02 15:38:43.555 21311 ERROR cinder name=name, global_conf=global_conf).create()
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2017-10-02 15:38:43.555 21311 ERROR cinder return self.object_type.invoke(self)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 146, in invoke
2017-10-02 15:38:43.555 21311 ERROR cinder return fix_call(context.object, context.global_conf, **context.local_conf)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 55, in fix_call
2017-10-02 15:38:43.555 21311 ERROR cinder val = callable(*args, **kw)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/openstack/__init__.py", line 72, in factory
2017-10-02 15:38:43.555 21311 ERROR cinder return cls()
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/openstack/__init__.py", line 83, in __init__
2017-10-02 15:38:43.555 21311 ERROR cinder self._setup_routes(mapper, ext_mgr)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/v2/router.py", line 45, in _setup_routes
2017-10-02 15:38:43.555 21311 ERROR cinder self.resources['volumes'] = volumes.create_resource(ext_mgr)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/v2/volumes.py", line 338, in create_resource
2017-10-02 15:38:43.555 21311 ERROR cinder return wsgi.Resource(VolumeController(ext_mgr))
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/api/v2/volumes.py", line 49, in __init__
2017-10-02 15:38:43.555 21311 ERROR cinder self.volume_api = cinder_volume.API()
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/volume/__init__.py", line 30, in API
2017-10-02 15:38:43.555 21311 ERROR cinder return importutils.import_object(class_name, *args, **kwargs)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 44, in import_object
2017-10-02 15:38:43.555 21311 ERROR cinder return import_class(import_str)(*args, **kwargs)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/volume/api.py", line 134, in __init__
2017-10-02 15:38:43.555 21311 ERROR cinder self.key_manager = key_manager.API(CONF)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/cinder/keymgr/__init__.py", line 29, in API
2017-10-02 15:38:43.555 21311 ERROR cinder cls = importutils.import_class(conf.key_manager.backend)
2017-10-02 15:38:43.555 21311 ERROR cinder File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 30, in import_class
2017-10-02 15:38:43.555 21311 ERROR cinder __import__(mod_str)
2017-10-02 15:38:43.555 21311 ERROR cinder ValueError: Empty module name
2017-10-02 15:38:43.555 21311 ERROR cinder

Note that key_manager/backend default value is 'barbican'. While castellan resolves this to a class using stevedore, cinder loads it tries to load it directly [2], so it fails if the value o f backend or api_class is not set to a full class path as 'castellan.key_manager.barbican_key_manager:BarbicanKeyManager'.

[1] https://github.com/openstack/castellan/blob/master/castellan/key_manager/__init__.py#L38-L48
[2] https://github.com/openstack/cinder/blob/master/cinder/keymgr/__init__.py#L29