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Description of problem: I copy-pasted the command wrong and tried to run it like this: upgrade-non-controller.sh <node_uuid> The command exited immediately without doing anything and without printing an error. The "--upgrade" is mandatory on the command line, and if you don't pass it or anything else which is acceptable - the script exits without giving you a hint as to what's wrong.
Not going to fix, for OSP11 upgrade scripts are being completely changed.