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Hello, I'm running Devstack on CentOS 7 and having some issues with
Sahara. Namely, I cannot successfully launch a cluster. It gets stuck
on the "validating" step. The following is what appeared to be the
most relevant information that I could find in the logs. Any help
appreciated. Thanks!



2016-06-01 15:14:45.014 WARNING kazoo.client [-] Connection dropped:
socket connection error: ECONNREFUSED
2016-06-01 15:14:48.520 INFO kazoo.client [-] Connecting to 127.0.0.1:2181
2016-06-01 15:14:48.521 WARNING kazoo.client [-] Connection dropped:
socket connection error: ECONNREFUSED
2016-06-01 15:14:50.324 WARNING kazoo.client [-] Failed connecting to
Zookeeper within the connection retry policy.
2016-06-01 15:14:50.324 INFO kazoo.client [-] Zookeeper session lost,
state: CLOSED
2016-06-01 15:14:50.325 ERROR sahara.service.coordinator [-] Error
connecting to coordination backend.
2016-06-01 15:14:50.325 CRITICAL sahara [-] ToozConnectionError:
Operational error: Connection time-out

2016-06-01 15:14:50.325 TRACE sahara Traceback (most recent call last):
2016-06-01 15:14:50.325 TRACE sahara   File "/usr/bin/sahara-engine",
line 10, in <module>
2016-06-01 15:14:50.325 TRACE sahara     sys.exit(main())
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/cli/sahara_engine.py", line 49, in main
2016-06-01 15:14:50.325 TRACE sahara     server.setup_sahara_engine()
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/main.py", line 105, in setup_sahara_engine
2016-06-01 15:14:50.325 TRACE sahara     periodic.setup()
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/service/periodic.py", line 263, in setup
2016-06-01 15:14:50.325 TRACE sahara     pt = _make_periodic_tasks()
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/service/periodic.py", line 138, in
_make_periodic_tasks
2016-06-01 15:14:50.325 TRACE sahara     class
SaharaPeriodicTasks(periodic_task.PeriodicTasks):
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/service/periodic.py", line 140, in
SaharaPeriodicTasks
2016-06-01 15:14:50.325 TRACE sahara
CONF.periodic_coordinator_backend_url, 'sahara-periodic-tasks')
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/service/coordinator.py", line 100, in
__init__
2016-06-01 15:14:50.325 TRACE sahara     super(HashRing,
self).__init__(backend_url)
2016-06-01 15:14:50.325 TRACE sahara   File
"/opt/stack/sahara/sahara/service/coordinator.py", line 54, in
__init__
2016-06-01 15:14:50.325 TRACE sahara     self.coordinator.start()
2016-06-01 15:14:50.325 TRACE sahara   File
"/usr/lib/python2.7/site-packages/tooz/coordination.py", line 295, in
start
2016-06-01 15:14:50.325 TRACE sahara     self._start()
2016-06-01 15:14:50.325 TRACE sahara   File
"/usr/lib/python2.7/site-packages/tooz/drivers/zookeeper.py", line 99,
in _start
2016-06-01 15:14:50.325 TRACE sahara     cause=e)
2016-06-01 15:14:50.325 TRACE sahara   File
"/usr/lib/python2.7/site-packages/tooz/coordination.py", line 669, in
raise_with_cause
2016-06-01 15:14:50.325 TRACE sahara
excutils.raise_with_cause(exc_cls, message, *args, **kwargs)
2016-06-01 15:14:50.325 TRACE sahara   File
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 144,
in raise_with_cause
2016-06-01 15:14:50.325 TRACE sahara
six.raise_from(exc_cls(message, *args, **kwargs), kwargs.get('cause'))
2016-06-01 15:14:50.325 TRACE sahara   File
"/usr/lib/python2.7/site-packages/six.py", line 718, in raise_from
2016-06-01 15:14:50.325 TRACE sahara     raise value
2016-06-01 15:14:50.325 TRACE sahara ToozConnectionError: Operational
error: Connection time-out
2016-06-01 15:14:50.325 TRACE sahara
sahara-eng failed to start