I do have this error looping every minute or so. 2019-05-17 21:33:39.463 8 DEBUG ironicclient.common.http [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] No version header in response, requesting from server negotiate_version /usr/lib/python3.6/site-packages/ironicclient/common/http.py:157 2019-05-17 21:33:39.473 8 ERROR nova.virt.ironic.driver [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] An unknown error has occurred when trying to get the list of nodes from the Ironic inventory. Error: 'StrictVersion' object has no attribute 'version' 2019-05-17 21:33:39.473 8 WARNING nova.compute.manager [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Virt driver is not ready.: nova.exception.VirtDriverNotReady: Virt driver is not ready. 2019-05-17 21:33:40.473 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._heal_instance_info_cache run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:40.473 8 DEBUG nova.compute.manager [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Starting heal instance info cache _heal_instance_info_cache /usr/lib/python3.6/site-packages/nova/compute/manager.py:7247 2019-05-17 21:33:40.474 8 DEBUG nova.compute.manager [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Rebuilding the list of instances to heal _heal_instance_info_cache /usr/lib/python3.6/site-packages/nova/compute/manager.py:7251 2019-05-17 21:33:40.487 8 DEBUG nova.compute.manager [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Didn't find any instances for network info cache update. _heal_instance_info_cache /usr/lib/python3.6/site-packages/nova/compute/manager.py:7333 2019-05-17 21:33:40.487 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._poll_unconfirmed_resizes run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:40.488 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._reclaim_queued_deletes run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:40.488 8 DEBUG nova.compute.manager [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] CONF.reclaim_instance_interval <= 0, skipping... _reclaim_queued_deletes /usr/lib/python3.6/site-packages/nova/compute/manager.py:7946 2019-05-17 21:33:41.422 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._poll_rebooting_instances run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:41.423 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._poll_rescued_instances run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:43.422 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._instance_usage_audit run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:46.415 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._sync_scheduler_instance_info run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:47.429 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._check_instance_build_time run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 2019-05-17 21:33:49.422 8 DEBUG oslo_service.periodic_task [req-f1d152cb-d19c-4946-b0b0-baaf2f9e4804 - - - - -] Running periodic task ComputeManager._poll_volume_usage run_periodic_tasks /usr/lib/python3.6/site-packages/oslo_service/periodic_task.py:217 and some error in mistral when trying to introspect overcloud nodes: 2019-05-17 21:21:09.091 8 INFO workflow_trace [req-d462b3f8-acde-4224-9977-877545feed2e 022b15c9e0b14450b55c71d23bce3253 561ad084af1941b5931dc317db563e12 - default default] Task 'cell_v2_discover_hosts' (ff79c16c-b48e-495a-b2cc-38d9e92df08f) [RUNNING -> ERROR, msg=Failure caused by error in tasks: wait_for_nova_resources wait_for_nova_resources [task_ex_id=ec65be73-4f36-425c-9bd4-6684456c3b32] -> One or more actions had failed. [action_ex_id=15a7c7e2-558b-4548-b73b-a78d4b7be594, idx=0]: The action raised an exception [action_ex_id=15a7c7e2-558b-4548-b73b-a78d4b7be594, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': '005d8935-9991-40bc-95be-dd0eb0e3830e'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': '005d8935-9991-40bc-95be-dd0eb0e3830e'}. (HTTP 404) [action_ex_id=266a8a2b-4218-441d-902c-3f7da984d912, idx=1]: The action raised an exception [action_ex_id=266a8a2b-4218-441d-902c-3f7da984d912, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': '4b0e84d7-7810-4a42-81d5-6b14579362c8'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': '4b0e84d7-7810-4a42-81d5-6b14579362c8'}. (HTTP 404) [action_ex_id=4f6e7bea-55ef-4b92-8539-76f2d2decfa4, idx=2]: The action raised an exception [action_ex_id=4f6e7bea-55ef-4b92-8539-76f2d2decfa4, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': 'c586ead4-07b0-4e3c-983e-ad1ece3ffc1e'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': 'c586ead4-07b0-4e3c-983e-ad1ece3ffc1e'}. (HTTP 404) [action_ex_id=64e5320d-fb64-49b0-8cb0-eb62f04f4170, idx=3]: The action raised an exception [action_ex_id=64e5320d-fb64-49b0-8cb0-eb62f04f4170, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': '6bf2c92f-8eaf-4596-982c-87cef89337b7'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': '6bf2c92f-8eaf-4596-982c-87cef89337b7'}. (HTTP 404) [action_ex_id=83e97b9c-2775-4752-962d-d19cc728ff0c, idx=4]: The action raised an exception [action_ex_id=83e97b9c-2775-4752-962d-d19cc728ff0c, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': '6f539c86-3905-4014-8973-f515343c6c4b'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': '6f539c86-3905-4014-8973-f515343c6c4b'}. (HTTP 404) [action_ex_id=b7881d3d-78c7-4898-a8cd-36a8b25112a5, idx=5]: The action raised an exception [action_ex_id=b7881d3d-78c7-4898-a8cd-36a8b25112a5, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': '82cdb49e-a248-4221-8206-62813b6deb26'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': '82cdb49e-a248-4221-8206-62813b6deb26'}. (HTTP 404) [action_ex_id=c0aca431-e692-45e0-98ef-2f5fcf8fa623, idx=6]: The action raised an exception [action_ex_id=c0aca431-e692-45e0-98ef-2f5fcf8fa623, action_cls='', attributes='{'client_method_name': 'hypervisors.find'}', params='{'hypervisor_hostname': 'd1e608f4-9e95-4d85-8d8b-ad8ee73c01d5'}'] NovaAction.hypervisors.find failed: No Hypervisor matching {'hypervisor_hostname': 'd1e608f4-9e95-4d85-8d8b-ad8ee73c01d5'}. (HTTP 404) ] (execution_id=e0b1ab58-9b03-4088-a008-a92614dcd892) (END)