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nova error - ERROR (ConnectFailure): Unable to establish connection

I am trying to configure openstack mitaka in my local test environment which is of Ubuntu platform.

After configuring nova I am getting error.

I am unable to check the status of nova services.

Its showing an error:

root@controller:/var/log/nova# openstack compute service list
Unable to establish connection to http://controller:8774/v2/c93d2c39f4154f52bed4681d15890763/os-services

While I am checking the log I can see the error as follows:

nova-api.log:

2016-11-01 14:57:21.831 12996 ERROR nova     super(APIRouterV21, self).__init__(init_only)
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/__init__.py", line 413, in __init__
2016-11-01 14:57:21.831 12996 ERROR nova     self._register_resources_check_inherits(mapper)
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/__init__.py", line 437, in _register_resources_check_inherits
2016-11-01 14:57:21.831 12996 ERROR nova     for resource in ext.obj.get_resources():
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/cloudpipe.py", line 189, in get_resources
2016-11-01 14:57:21.831 12996 ERROR nova     CloudpipeController())]
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/cloudpipe.py", line 49, in __init__
2016-11-01 14:57:21.831 12996 ERROR nova     self.setup()
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/cloudpipe.py", line 56, in setup
2016-11-01 14:57:21.831 12996 ERROR nova     fileutils.ensure_tree(CONF.keys_path)
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/dist-packages/oslo_utils/fileutils.py", line 42, in ensure_tree
2016-11-01 14:57:21.831 12996 ERROR nova     os.makedirs(path, mode)
2016-11-01 14:57:21.831 12996 ERROR nova   File "/usr/lib/python2.7/os.py", line 157, in makedirs
2016-11-01 14:57:21.831 12996 ERROR nova     mkdir(name, mode)
2016-11-01 14:57:21.831 12996 ERROR nova OSError: [Errno 13] Permission denied: '/usr/lib/python2.7/dist-packages/keys'

Also getting error in nova-conductor.log:

2016-11-01 13:07:24.524 16338 ERROR nova.servicegroup.drivers.db OperationalError: (sqlite3.OperationalError) database is locked [SQL: u'UPDATE services SET updated_at=?, report_count=?, last_seen_up=? WHERE services.id = ?'] [parameters: ('2016-11-01 07:37:24.523455', 1, '2016-11-01 07:37:24.519327', 3)]

Someone help me to fix the same.