Open Stack

Hi everyone.
I'm really new to OpenStack.
After I install essential components of OpenStack, such as Nova, Keystone,
etc, I attempted creating an instance through Openstack command in the
terminal.
But a trouble has occurred. It was logged in "nova-conductor.log":

2018-11-01 22:18:59.831 2570 ERROR nova.scheduler.utils
> [req-12aae2ff-4186-4ab0-964c-35b335c3188a cc22ec575cb44e53aced9ddf58d9e8d7
> 965ff1c2002d4c278b5f838dbdbbb780 - default default] [instance:
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee] Error from last host: node2 (node
> node2): [u'Traceback (most recent call last):\n', u'  File
> "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1840, in
> _do_build_and_run_instance\n    filter_properties, request_spec)\n', u'
> File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2120,
> in _build_and_run_instance\n    instance_uuid=instance.uuid,
> reason=six.text_type(e))\n', u"RescheduledException: Build of instance
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee was re-scheduled: Invalid input for
> field 'identity/password/user/password': None is not of type
> 'string'\n\nFailed validating 'type' in
> schema['properties']['identity']['properties']['password']['properties']['user']['properties']['password']:\n
>   {'type': 'string'}\n\nOn
> instance['identity']['password']['user']['password']:\n    None (HTTP 400)
> (Request-ID: req-350beee4-2fed-4645-9e21-79806d7ebfe7)\n"]
> 2018-11-01 22:18:59.833 2570 WARNING oslo_config.cfg
> [req-12aae2ff-4186-4ab0-964c-35b335c3188a cc22ec575cb44e53aced9ddf58d9e8d7
> 965ff1c2002d4c278b5f838dbdbbb780 - default default] Option "os_region_name"
> from group "placement" is deprecated. Use option "region-name" from group
> "placement".
> 2018-11-01 22:19:10.936 2571 ERROR nova.scheduler.utils
> [req-12aae2ff-4186-4ab0-964c-35b335c3188a cc22ec575cb44e53aced9ddf58d9e8d7
> 965ff1c2002d4c278b5f838dbdbbb780 - default default] [instance:
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee] Error from last host: node4 (node
> node4): [u'Traceback (most recent call last):\n', u'  File
> "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1840, in
> _do_build_and_run_instance\n    filter_properties, request_spec)\n', u'
> File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2120,
> in _build_and_run_instance\n    instance_uuid=instance.uuid,
> reason=six.text_type(e))\n', u"RescheduledException: Build of instance
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee was re-scheduled: internal error:
> libxenlight failed to create new domain 'instance-00000005'\n"]
> 2018-11-01 22:19:21.783 2567 ERROR nova.scheduler.utils
> [req-12aae2ff-4186-4ab0-964c-35b335c3188a cc22ec575cb44e53aced9ddf58d9e8d7
> 965ff1c2002d4c278b5f838dbdbbb780 - default default] [instance:
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee] Error from last host: node5 (node
> node5): [u'Traceback (most recent call last):\n', u'  File
> "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1840, in
> _do_build_and_run_instance\n    filter_properties, request_spec)\n', u'
> File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2120,
> in _build_and_run_instance\n    instance_uuid=instance.uuid,
> reason=six.text_type(e))\n', u"RescheduledException: Build of instance
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee was re-scheduled: internal error:
> libxenlight failed to create new domain 'instance-00000005'\n"]
> 2018-11-01 22:19:21.783 2567 WARNING nova.scheduler.utils
> [req-12aae2ff-4186-4ab0-964c-35b335c3188a cc22ec575cb44e53aced9ddf58d9e8d7
> 965ff1c2002d4c278b5f838dbdbbb780 - default default] Failed to
> compute_task_build_instances: Exceeded maximum number of retries. Exceeded
> max scheduling attempts 3 for instance
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee. Last exception: internal error:
> libxenlight failed to create new domain 'instance-00000005':
> MaxRetriesExceeded: Exceeded maximum number of retries. Exceeded max
> scheduling attempts 3 for instance 684b0a7d-22b9-4c87-88f8-b1474d3f9cee.
> Last exception: internal error: libxenlight failed to create new domain
> 'instance-00000005'
> 2018-11-01 22:19:21.784 2567 WARNING nova.scheduler.utils
> [req-12aae2ff-4186-4ab0-964c-35b335c3188a cc22ec575cb44e53aced9ddf58d9e8d7
> 965ff1c2002d4c278b5f838dbdbbb780 - default default] [instance:
> 684b0a7d-22b9-4c87-88f8-b1474d3f9cee] Setting instance to ERROR state.:
> MaxRetriesExceeded: Exceeded maximum number of retries. Exceeded max
> scheduling attempts 3 for instance 684b0a7d-22b9-4c87-88f8-b1474d3f9cee.
> Last exception: internal error: libxenlight failed to create new domain
> 'instance-00000005'


 I'm not sure which component is involved in this trouble.
And libvirt and Xen have been successfully installed on all compute node I
have without any problem.

nickeys at node2:~$ virsh create ./test.xml
> Domain guest1 created from ./test.xml
> nickeys at node2:~$ virsh list
>  Id   Name       State
> --------------------------
>  0    Domain-0   running
>  1    guest1     running
> nickeys at node2:~$


What should I check first for that issue ?
Your hint would be big help for me.

Thanks!
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