This is somewhat tricky to deal with during the upgrade of individual monitors, as the bootstrap_manager code creates a new keyring using a mgr based profile, which is unknown to any older ceph-mon daemons still running (which is the case during a rolling upgrade).
This is somewhat tricky to deal with during the upgrade of individual monitors, as the bootstrap_manager code creates a new keyring using a mgr based profile, which is unknown to any older ceph-mon daemons still running (which is the case during a rolling upgrade).