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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

I'm pretty sure unstack.sh is no longer really supported in devstack.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1770375

Title:
  DiskNotFound exception raised when updating available resources

Status in devstack:
  New
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  With a new devstack installation, when nova tries to initially update
  available resources of compute nodes it fails leaving no hypervisors
  available.

  The following traceback is given in the nova compute logs:

   DEBUG oslo_service.periodic_task [None req-af656602-6b0a-4820-a5a0-f0a177286ed8 None None] Running periodic task ComputeManager.update_available_resource {{(pid=10526) run_periodic_tasks /usr/lib/python2.7/site-packages/oslo_service/periodic_task.py:215}}
  ERROR nova.compute.manager [None req-af656602-6b0a-4820-a5a0-f0a177286ed8 None None] No compute node record for host wn1209301.in.tier2.hep.manchester.ac.uk: ComputeHostNotFound_Remote: Compute host wn1209301.in.tier2.hep.manchester.ac.uk could not be found.
  DEBUG nova.compute.resource_tracker [None req-af656602-6b0a-4820-a5a0-f0a177286ed8 None None] Auditing locally available compute resources for wn1209301.in.tier2.hep.manchester.ac.uk (node: wn1209301.in.tier2.hep.manchester.ac.uk) {{(pid=10526) update_available_resource /opt/stack/nova/nova/compute/resource_tracker.py:663}}
  ERROR nova.compute.manager [None req-af656602-6b0a-4820-a5a0-f0a177286ed8 None None] Error updating resources for node wn1209301.in.tier2.hep.manchester.ac.uk.: DiskNotFound: No disk at /opt/stack/data/nova/instances/d974d379-a237-4848-be27-d284a2b53696/disk
  ERROR nova.compute.manager Traceback (most recent call last):
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/compute/manager.py", line 7334, in update_available_resource_for_node
  ERROR nova.compute.manager     rt.update_available_resource(context, nodename)
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/compute/resource_tracker.py", line 664, in update_available_resource
  ERROR nova.compute.manager     resources = self.driver.get_available_resource(nodename)
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 6395, in get_available_resource
  ERROR nova.compute.manager     disk_over_committed = self._get_disk_over_committed_size_total()
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 7992, in _get_disk_over_committed_size_total
  ERROR nova.compute.manager     err_ctxt.reraise = False
  ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  ERROR nova.compute.manager     self.force_reraise()
  ERROR nova.compute.manager   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  ERROR nova.compute.manager     six.reraise(self.type_, self.value, self.tb)
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 7938, in _get_disk_over_committed_size_total
  ERROR nova.compute.manager     config, block_device_info)
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 7846, in _get_instance_disk_info_from_config
  ERROR nova.compute.manager     dk_size = disk_api.get_allocated_disk_size(path)
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/virt/disk/api.py", line 109, in get_allocated_disk_size
  ERROR nova.compute.manager     return images.qemu_img_info(path).disk_size
  ERROR nova.compute.manager   File "/opt/stack/nova/nova/virt/images.py", line 57, in qemu_img_info
  ERROR nova.compute.manager     raise exception.DiskNotFound(location=path)
  ERROR nova.compute.manager DiskNotFound: No disk at /opt/stack/data/nova/instances/d974d379-a237-4848-be27-d284a2b53696/disk

  This path doesn't exist, as no instances have been created. Thought it might be a something left over in the sql db, but no instances are listed there. The instance id changes if you reinstall openstack by running unstack.sh and then stack.sh again.
  This leaves the hypervisor unavailable and so instances can't be created.

  On devstack commit b89bfa21b0e144d8160478b54a45a1087ea3e1df
  On nova commit a8d3c61a579648f3ee469f81aee24d57cc8f37cb
  Hypervisor: libvirt/kvm
  Networking: Neutron w/ ovs

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