Open Stack

On 27 Apr 2015 09:32, "Bhaskar Rao" <bhaskar.rao at citrix.com> wrote:
>
> Hi All,
>
>
>
> With help of user data files, we can provide instance specific details
(like IP address, Gateway etc.) to VM booting in OpenStack environment.
>
> This user data file gets attached with VM as part of specific label for
example config-2.
>
>
>
> We want to know how this labeling mechanism works? Who decides to give
name ‘config-2’ to use for supplied info?
>
> Is there any possibility that instead of ‘config-2’, it can use another
name e.g. ‘config-x’?
>
>
>
> Thanks,
>
> Bhaskar
>

Hi,

The name is specifically crafted for config-drive version 2. The reference
consumer of this is cloud-init (on linux), but other projects such as
cloudbase-init (on windows), also consume this standard.  This standard was
originally written for OpenStack.

Version 2 was created due to short fallings with the original spec, and
both of these consumers specifically match on the device being named
'config-v2' to avoid miss-parsing the wrong device. Therefore changing the
name in the hard coded portion of nova would break the consumers.

To flip the topic slightly, why would you want to use a different named
device?  What are you trying to do?

--
Kind Regards,
Dave Walker
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