Description of problem: The nova-compute service does not strongly correlate with the unique identifier used to represent itself. In most cases, we use the system hostname as the identifier by which we locate our Service and ComputeNode records in the database. However, hostnames can change (both intentionally and unintentionally) which makes this problematic. The Nova project has long said “don’t do that” although, in reality, we must be less fragile and able to detect and protect against database corruption if it happens. Version-Release number of selected component (if applicable): 17.1 How reproducible: Always Steps to Reproduce: 1. 2. 3. Actual results: system hostname is used at identifier Expected results: Have a unique UUID instead Additional info: Related to blueprint: https://review.opendev.org/q/topic:bp%252Fstable-compute-uuid