I have removed the qemu and libvirtd packages and reran the nova playbook. Now the libvirtd service is running fine but the nova-compute service is still showing these errors: ---------- 2020-03-20 07:27:53.807 23547 ERROR nova.scheduler.client.report [req-cf316419-0db4-4916-9fa8-71392eacb052 - - - - -] [None] Failed to retrieve resource provider tree from placement API for UUID ea3af0ff-fb69-449a-b484-5ac722010a1f. Got 503:

503 Service Unavailable

No server is available to handle this request. . 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager [req-cf316419-0db4-4916-9fa8-71392eacb052 - - - - -] Error updating resources for node b2a-1.: ResourceProviderRetrievalFailed: Failed to get resource provider with UUID ea3af0ff-fb69-449a-b484-5ac722010a1f 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager Traceback (most recent call last): 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/compute/manager.py", line 7928, in _update_available_resource_for_node 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager rt.update_available_resource(context, nodename) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/compute/resource_tracker.py", line 720, in update_available_resource 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager self._update_available_resource(context, resources) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 274, in inner 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager return f(*args, **kwargs) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/compute/resource_tracker.py", line 797, in _update_available_resource 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager self._update(context, cn) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/retrying.py", line 49, in wrapped_f 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager return Retrying(*dargs, **dkw).call(f, *args, **kw) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/retrying.py", line 206, in call 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager return attempt.get(self._wrap_exception) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/retrying.py", line 247, in get 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager six.reraise(self.value[0], self.value[1], self.value[2]) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/retrying.py", line 200, in call 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager attempt = Attempt(fn(*args, **kwargs), attempt_number, False) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/compute/resource_tracker.py", line 959, in _update 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager self._update_to_placement(context, compute_node) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/compute/resource_tracker.py", line 911, in _update_to_placement 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager context, compute_node.uuid, name=compute_node.hypervisor_hostname) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 35, in __run_method 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager return getattr(self.instance, __name)(*args, **kwargs) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/scheduler/client/report.py", line 1006, in get_provider_tree_and_ensure_root 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager parent_provider_uuid=parent_provider_uuid) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/scheduler/client/report.py", line 668, in _ensure_resource_provider 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager rps_to_refresh = self._get_providers_in_tree(context, uuid) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/scheduler/client/report.py", line 74, in wrapper 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager return f(self, *a, **k) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager File "/openstack/venvs/nova-18.1.9/lib/python2.7/site-packages/nova/scheduler/client/report.py", line 535, in _get_providers_in_tree 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager raise exception.ResourceProviderRetrievalFailed(uuid=uuid) 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager ResourceProviderRetrievalFailed: Failed to get resource provider with UUID ea3af0ff-fb69-449a-b484-5ac722010a1f 2020-03-20 07:27:53.808 23547 ERROR nova.compute.manager ---------------------