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[Balazs Gibizer <balazs.gibizer@xxxxxxxx>]

@Wallace: please re-opend the issue if you still see this error after
./clean.sh

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

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https://bugs.launchpad.net/bugs/1804205

Title:
  libvirtError: operation failed: domain 'instance-00000003' already
  exists with uuid e017717e-9647-4740-8efa-4ec2aa25f35c

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ==============
  Testing the Nova component, I figured out that many times the instances (servers) were not created or instantiated because the following error:

  libvirtError: operation failed: domain 'instance-00000003' already
  exists with uuid e017717e-9647-4740-8efa-4ec2aa25f35c

  I don't understand how that is possible. There exist a way of
  circumventing that? Can OpenStack solve it before creating an
  instance?

  Worth noticing that I ran the unstack script before starting creating
  new instances, so it is a residual instance from another time I ran
  stack script.

  Steps to Reproduce
  =====================
  I don't know.

  Expected Result
  ==================
  Not sure, but I think that the system needs to be prepared against this situation. The worst case is the scenario where it is not possible to create instances because a range of names is being used.

  Actual Result
  ================
  Many instances been set to error state because a name of an existent instance already exists.

  Environment
  ==============
  Devstack/Queens/Stable.
  Ubuntu 16.04.

  Logs & Configs
  ================
  Attached.

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