OpenStack Compute (Nova)
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An instance can be rebuilt in-place with the original image or a new
image. Instance resource usage cannot be altered during a rebuild.
Previously Nova would have ignored the NUMA topology of the new image
continuing to use the NUMA topology of the existing instance until a move
operation was performed. As Nova did not explicitly guard against
inadvertent changes in resource request contained in a new image,
it was possible to rebuild with an image that would violate this requirement
`bug #1763766`_. This resulted in an inconsistent state as the instance that
was running did not match the instance that was requested. Nova now explicitly
checks if a rebuild would alter the requested NUMA topology of an instance
and rejects the rebuild.
.. _`bug #1763766`: