Perhaps an obvious statement, but devstack master was working with stable/kilo until recently, and as of today, it isn't any more (at least for me).
The devstack commit "Use stevedore for keystone backends" on 2014-05-15 changes the way backends are set, and when I did a fresh install today I ended up with keystone.conf entries like this: [assignment] driver = sql ... [identity] driver = sql ... [token] driver = sql rather than fully specified module names (e.g. "driver = keystone.identity.backends.sql.Identity") This caused keystone to fail, with errors in /var/log/apache2/keystone.log like this: 2015-05-16 21:16:25.786955 mod_wsgi (pid=9296): Exception occurred processing WSGI script '/var/www/keystone/main'. 2015-05-16 21:16:25.787114 Traceback (most recent call last): 2015-05-16 21:16:25.787189 File "/var/www/keystone/main", line 25, in <module> 2015-05-16 21:16:25.787409 application = wsgi_server.initialize_application(name) 2015-05-16 21:16:25.787437 File "/opt/stack/keystone/keystone/server/wsgi.py", line 51, in initialize_application 2015-05-16 21:16:25.787600 startup_application_fn=loadapp) 2015-05-16 21:16:25.787625 File "/opt/stack/keystone/keystone/server/common.py", line 41, in setup_backends 2015-05-16 21:16:25.787769 drivers = backends.load_backends() 2015-05-16 21:16:25.787795 File "/opt/stack/keystone/keystone/backends.py", line 39, in load_backends 2015-05-16 21:16:25.787946 _IDENTITY_API = identity.Manager() 2015-05-16 21:16:25.789345 File "/opt/stack/keystone/keystone/common/dependency.py", line 131, in __wrapped_init__ 2015-05-16 21:16:25.789519 init(self, *args, **kwargs) 2015-05-16 21:16:25.789544 File "/opt/stack/keystone/keystone/common/dependency.py", line 193, in wrapper 2015-05-16 21:16:25.789570 self.__wrapped_init__(*args, **kwargs) 2015-05-16 21:16:25.789584 File "/opt/stack/keystone/keystone/identity/core.py", line 412, in __init__ 2015-05-16 21:16:25.790098 super(Manager, self).__init__(CONF.identity.driver) 2015-05-16 21:16:25.790124 File "/opt/stack/keystone/keystone/common/manager.py", line 70, in __init__ 2015-05-16 21:16:25.790203 self.driver = importutils.import_object(driver_name) 2015-05-16 21:16:25.790226 File "/usr/local/lib/python2.7/dist-packages/oslo_utils/importutils.py", line 38, in import_object 2015-05-16 21:16:25.790312 return import_class(import_str)(*args, **kwargs) 2015-05-16 21:16:25.790335 File "/usr/local/lib/python2.7/dist-packages/oslo_utils/importutils.py", line 27, in import_class 2015-05-16 21:16:25.790358 __import__(mod_str) 2015-05-16 21:16:25.790384 ValueError: Empty module name After much head-scratching, since I'm not that familiar with keystone, I figured out what was going on, corrected keystone.conf, and then went back to devstack:stable/kilo, which behaves normally. I don't think there's an issue here, but wanted to share in case someone else hits the same problem. cheers, Scott
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