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Worse, if you use ironic, I think configdrive is mapped to a partition at provision time. so hot plugging can't ever work in that scenario.

Thanks,
Kevin
________________________________________
From: Clint Byrum [clint at fewbar.com]
Sent: Tuesday, June 21, 2016 4:15 PM
To: openstack-dev
Subject: Re: [openstack-dev] [nova] ability to set metadata on instances        (but config drive is not updated)

Excerpts from Joshua Harlow's message of 2016-06-21 15:12:09 -0700:
> Agreed, it appears supported right-now (whether intentional or not),
>
> So the question at that point is what can we do to make it better...
>
> I think we all agree that the config-drive probably shouldn't have the
> equivalent of the metadata service in it; because if the metadata
> service can change over time, and the config-drive can't then it's a bad
> equivalent and that should be rectified, either by making it an
> equivalent or making it be accepted that it is not, and ideally trimming
> the data in it to not confuse people (ie by providing static networking
> configuration only, and leaving the items that can be dynamic to the
> dynamic metadata service).
>
> Of course this whole mess IMHO gets into, 'why don't we just have an
> agreed up agent that can be used'; because that's what the metadata
> service is starting to become (a crappy version of an agent); but I digress.
>

Not sure I agree with your initial stipulation. It shouldn't be a
surprise, at all, to any user, that an HTTP service is updated live,
while an ISO attached to an instance is kept static.

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