On nova-compute startup with the ironic driver, the _sync_power_states periodic can fail and trace with a VirtDriverNotReady error if ironic-api is not yet running. This is normal, and we shouldn't trace for it.
http://logs.openstack.org/27/602127/2/check/ironic-tempest-dsvm-ipa-wholedisk-bios-agent_ipmitool-tinyipa/4238d0f/controller/logs/screen-n-cpu.txt.gz?level=TRACE#_Sep_20_21_52_03_587436
Sep 20 21:52:03.587436 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task [None req-2339900e-55df-468b-95ff-b904d73d5728 None None] Error during ComputeManager._sync_power_states: VirtDriverNotReady: Virt driver is not ready.
Sep 20 21:52:03.587629 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task Traceback (most recent call last):
Sep 20 21:52:03.587816 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task File "/usr/local/lib/python2.7/dist-packages/oslo_service/periodic_task.py", line 220, in run_periodic_tasks
Sep 20 21:52:03.588019 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task task(self, context)
Sep 20 21:52:03.588182 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task File "/opt/stack/nova/nova/compute/manager.py", line 7462, in _sync_power_states
Sep 20 21:52:03.588344 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task num_vm_instances = self.driver.get_num_instances()
Sep 20 21:52:03.588517 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task File "/opt/stack/nova/nova/virt/driver.py", line 183, in get_num_instances
Sep 20 21:52:03.588714 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task return len(self.list_instances())
Sep 20 21:52:03.588885 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task File "/opt/stack/nova/nova/virt/ironic/driver.py", line 624, in list_instances
Sep 20 21:52:03.589071 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task fields=['instance_uuid'], limit=0)
Sep 20 21:52:03.589263 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task File "/opt/stack/nova/nova/virt/ironic/driver.py", line 611, in _get_node_list
Sep 20 21:52:03.589447 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task raise exception.VirtDriverNotReady()
Sep 20 21:52:03.589602 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task VirtDriverNotReady: Virt driver is not ready.
Sep 20 21:52:03.589770 ubuntu-xenial-inap-mtl01-0002177186 nova-compute[14241]: ERROR oslo_service.periodic_task
Fix proposed to branch: master /review. openstack. org/604376
Review: https:/