No valid host found for resize due to AggregateInstanceExtraSpecsFilter returned 0 hosts

Solution Verified - Updated -


  • When resizing an instance, the error "No valid host was found. No valid host found for resize (HTTP 400)" occurs.
  • There is sufficient available resources on the Compute node for resizing the instance.
  • The following messages are occurring in nova-scheduler.
Filter AggregateInstanceExtraSpecsFilter returned 0 hosts
fails instance_type extra_specs requirements. Extra_spec test is not in aggregate


  • Red Hat OpenStack Platform 16.1

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