OpenStack Nova 'No Valid Host Was Found': A Scheduling Failure Triage Guide
Why Nova reports 'No valid host was found': triage compute services, Placement inventory drift, scheduler filter rejections, cell mapping, and image reachability.
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openstackNo valid host was found in Nova Scheduler after DevStack cycle
DevStack is documented as a development environment rather than a reproducible deployment, and consecutive stack.sh runs can diverge when residual state is left behind. One documented failure condition that can surface in this situation is the Nova Scheduler message No valid host was found , raised when no compute host matches placement, resource, and filter