When I create a mongodb cluster, I appoint a network for the member instance, then it cuase the error:list index out of range
2017-09-11 14:14:14.840 7143 DEBUG trove.common.notification [-] Sending event: dbaas.cluster_create.error, {'client_ip': u'192.168.133.49', 'server_type': u'taskmanager', 'tenant_id': u'8129167d1c2e4647a6404ca3426c51f1', 'exception': ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/site-packages/trove/taskmanager/manager.py", line 384, in create_cluster\n    cluster_tasks.create_cluster(context, cluster_id)\n', '  File "/usr/lib/python2.7/site-packages/trove/common/strategies/cluster/experimental/mongodb/taskmanager.py", line 119, in create_cluster\n    _create_cluster()\n', '  File "/usr/lib/python2.7/site-packages/trove/common/strategies/cluster/experimental/mongodb/taskmanager.py", line 102, in _create_cluster\n    for instance in config_servers]\n', '  File "/usr/lib/python2.7/site-packages/trove/taskmanager/models.py", line 207, in get_ip\n    return instance.get_visible_ip_addresses()[0]\n', 'IndexError: list index out of range\n'], 'server_ip': u'192.168.133.49:8779', 'request_id': u'req-5d7f9ca3-7498-4c98-bc81-8ba6ac6a0512', 'message': 'list index out of range'} _notify /usr/lib/python2.7/site-packages/trove/common/notification.py:391
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher [-] Exception during message handling: list index out of range
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher Traceback (most recent call last):
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 138, in _dispatch_and_reply
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     incoming.message))
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 185, in _dispatch
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 127, in _do_dispatch
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 117, in wrapper
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     return f(*args, **kwargs)
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/trove/taskmanager/manager.py", line 384, in create_cluster
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     cluster_tasks.create_cluster(context, cluster_id)
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/trove/common/strategies/cluster/experimental/mongodb/taskmanager.py", line 119, in create_cluster
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     _create_cluster()
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/trove/common/strategies/cluster/experimental/mongodb/taskmanager.py", line 102, in _create_cluster
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     for instance in config_servers]
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/trove/taskmanager/models.py", line 207, in get_ip
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher     return instance.get_visible_ip_addresses()[0]
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher IndexError: list index out of range
2017-09-11 14:14:14.841 7143 ERROR oslo_messaging.rpc.dispatcher