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Excerpts from Michael Still's message of 2017-02-18 09:41:03 +1100:
> We have had this discussion several times in the past for other reasons.
> The reality is that some people will never deploy the metadata API, so I
> feel like we need a better solution than what we have now.
> 
> However, I would consider it probably unsafe for the hypervisor to read the
> current config drive to get values, and persisting things like the instance
> root password in the Nova DB sounds like a bad idea too.
> 

Agreed. What if we simply have a second config drive that is for "things
that change" and only rebuild that one on reboot?