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Thank you Bernd for your help, agree with you that AWS uses this and it's a de facto and every cloud image follows.

I am just trying to understand, as the metadata is in the DB, then nova could easily read it and give to an instance locally rather than a long way going. By reading and thinking further, I suppose that the local way maybe not be agile and flexible enough as it can only be added at the booting-up time(am I right here?).

With the RESTful API call method, likely the instance can access it anytime, though I am not sure there is any real scenario that the instance gets the metadata at day2.

Best regards, qlzhang