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[Bug 1730800] [NEW] UnknownConnectionError

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: zhi xu <1730800@xxxxxxxxxxxxxxxxxx>
Date: Wed, 08 Nov 2017 01:32:24 -0000
Reply-to: Bug 1730800 <1730800@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

[root@controller ~]# openstack server create --flavor m1.nano --image cirros-0.3.0-i386 --security-group permitall --key-name mykey provider-instance                                        Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'keystoneauth1.exceptions.connection.UnknownConnectionError'> (HTTP 500) (Request-ID: req-87716e72-824e-4618-9854-4be8ea96166b)
[root@controller ~]# 
[root@controller ~]# 
[root@controller ~]# !cat
cat /var/log/nova/nova-api.log 

2017-11-08 09:29:32.956 1938 INFO nova.api.openstack.wsgi [req-a6350065-4421-4e8f-b9a4-a65913a1d568 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] HTTP exception thrown: Flavor m1.nano could not be found.
2017-11-08 09:29:32.959 1938 INFO nova.osapi_compute.wsgi.server [req-a6350065-4421-4e8f-b9a4-a65913a1d568 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "GET /v2.1/flavors/m1.nano HTTP/1.1" status: 404 len: 500 time: 0.0435319
2017-11-08 09:29:32.982 1938 INFO nova.osapi_compute.wsgi.server [req-8a0509c7-3178-4458-94ab-7a10299d0134 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "GET /v2.1/flavors HTTP/1.1" status: 200 len: 586 time: 0.0198040
2017-11-08 09:29:32.999 1938 INFO nova.osapi_compute.wsgi.server [req-49747957-6405-4370-81ac-c9c4eaf80708 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "GET /v2.1/flavors/0 HTTP/1.1" status: 200 len: 752 time: 0.0131040
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions [req-87716e72-824e-4618-9854-4be8ea96166b 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] Unexpected exception in API method: UnknownConnectionError: Unexpected exception for api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a: No connection adapters were found for 'api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a'
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions Traceback (most recent call last):
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/extensions.py", line 336, in wrapped
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return f(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/servers.py", line 553, in create
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     **create_kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/hooks.py", line 154, in inner
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     rv = f(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1635, in create
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     tags=tags)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1076, in _create_instance
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     image_id, boot_meta = self._get_image(context, image_href)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 742, in _get_image
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     image = self.image_api.get(context, image_href)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/api.py", line 95, in get
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     show_deleted=show_deleted)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 231, in show
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     _reraise_translated_image_exception(image_id)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 820, in _reraise_translated_image_exception
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     six.reraise(type(new_exc), new_exc, exc_trace)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 229, in show
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     image = self._client.call(context, 2, 'get', image_id)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 166, in call
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     result = getattr(controller, method)(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/v2/images.py", line 197, in get
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return self._get(image_id)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/common/utils.py", line 545, in inner
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return RequestIdProxy(wrapped(*args, **kwargs))
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/v2/images.py", line 190, in _get
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     resp, body = self.http_client.get(url, headers=header)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 288, in get
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return self.request(url, 'GET', **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/common/http.py", line 335, in request
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 192, in request
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return self.session.request(url, method, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/positional/__init__.py", line 101, in inner
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return wrapped(*args, **kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 703, in request
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     resp = send(**kwargs)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 781, in _send_request
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     raise exceptions.UnknownConnectionError(msg, e)
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions UnknownConnectionError: Unexpected exception for api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a: No connection adapters were found for 'api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a'
2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions 
2017-11-08 09:29:33.190 1938 INFO nova.api.openstack.wsgi [req-87716e72-824e-4618-9854-4be8ea96166b 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<class 'keystoneauth1.exceptions.connection.UnknownConnectionError'>
2017-11-08 09:29:33.191 1938 INFO nova.osapi_compute.wsgi.server [req-87716e72-824e-4618-9854-4be8ea96166b 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "POST /v2.1/servers HTTP/1.1" status: 500 len: 665 time: 0.0402000
[root@controller ~]#

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1730800

Title:
  UnknownConnectionError

Status in OpenStack Compute (nova):
  New

Bug description:
  [root@controller ~]# openstack server create --flavor m1.nano --image cirros-0.3.0-i386 --security-group permitall --key-name mykey provider-instance                                        Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'keystoneauth1.exceptions.connection.UnknownConnectionError'> (HTTP 500) (Request-ID: req-87716e72-824e-4618-9854-4be8ea96166b)
  [root@controller ~]# 
  [root@controller ~]# 
  [root@controller ~]# !cat
  cat /var/log/nova/nova-api.log 

  2017-11-08 09:29:32.956 1938 INFO nova.api.openstack.wsgi [req-a6350065-4421-4e8f-b9a4-a65913a1d568 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] HTTP exception thrown: Flavor m1.nano could not be found.
  2017-11-08 09:29:32.959 1938 INFO nova.osapi_compute.wsgi.server [req-a6350065-4421-4e8f-b9a4-a65913a1d568 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "GET /v2.1/flavors/m1.nano HTTP/1.1" status: 404 len: 500 time: 0.0435319
  2017-11-08 09:29:32.982 1938 INFO nova.osapi_compute.wsgi.server [req-8a0509c7-3178-4458-94ab-7a10299d0134 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "GET /v2.1/flavors HTTP/1.1" status: 200 len: 586 time: 0.0198040
  2017-11-08 09:29:32.999 1938 INFO nova.osapi_compute.wsgi.server [req-49747957-6405-4370-81ac-c9c4eaf80708 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "GET /v2.1/flavors/0 HTTP/1.1" status: 200 len: 752 time: 0.0131040
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions [req-87716e72-824e-4618-9854-4be8ea96166b 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] Unexpected exception in API method: UnknownConnectionError: Unexpected exception for api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a: No connection adapters were found for 'api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a'
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions Traceback (most recent call last):
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/extensions.py", line 336, in wrapped
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return f(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 108, in wrapper
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/servers.py", line 553, in create
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     **create_kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/hooks.py", line 154, in inner
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     rv = f(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1635, in create
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     tags=tags)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1076, in _create_instance
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     image_id, boot_meta = self._get_image(context, image_href)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 742, in _get_image
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     image = self.image_api.get(context, image_href)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/api.py", line 95, in get
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     show_deleted=show_deleted)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 231, in show
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     _reraise_translated_image_exception(image_id)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 820, in _reraise_translated_image_exception
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     six.reraise(type(new_exc), new_exc, exc_trace)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 229, in show
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     image = self._client.call(context, 2, 'get', image_id)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line 166, in call
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     result = getattr(controller, method)(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/v2/images.py", line 197, in get
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return self._get(image_id)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/common/utils.py", line 545, in inner
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return RequestIdProxy(wrapped(*args, **kwargs))
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/v2/images.py", line 190, in _get
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     resp, body = self.http_client.get(url, headers=header)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 288, in get
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return self.request(url, 'GET', **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/glanceclient/common/http.py", line 335, in request
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 192, in request
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return self.session.request(url, method, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/positional/__init__.py", line 101, in inner
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     return wrapped(*args, **kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 703, in request
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     resp = send(**kwargs)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 781, in _send_request
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions     raise exceptions.UnknownConnectionError(msg, e)
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions UnknownConnectionError: Unexpected exception for api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a: No connection adapters were found for 'api_server = http://controller:9292/v2/images/6c861554-35b2-49eb-8dbf-a2a51bc1d07a'
  2017-11-08 09:29:33.189 1938 ERROR nova.api.openstack.extensions 
  2017-11-08 09:29:33.190 1938 INFO nova.api.openstack.wsgi [req-87716e72-824e-4618-9854-4be8ea96166b 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'keystoneauth1.exceptions.connection.UnknownConnectionError'>
  2017-11-08 09:29:33.191 1938 INFO nova.osapi_compute.wsgi.server [req-87716e72-824e-4618-9854-4be8ea96166b 78688b319571447080aea1e62f59ecb5 15e6f6ed6c9240168b85b561fcc8bc0f - default default] 192.168.99.6 "POST /v2.1/servers HTTP/1.1" status: 500 len: 665 time: 0.0402000
  [root@controller ~]#

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Follow ups

[Bug 1730800] Re: UnknownConnectionError
From: Launchpad Bug Tracker, 2018-01-11