Open Stack

On Mon, 3 Jun 2019 at 06:57, Kumari, Madhuri <madhuri.kumari at intel.com>
wrote:

> Hi Ironic, Nova Developers,
>
>
>
> I am currently working on implementing Intel Speed Select(ISS) feature[1]
> in Ironic and I have a use case where I want to change ISS configuration in
> BIOS after a node is provisioned.
>
> Such use case of changing the configuration post deployment is common and
> not specific to ISS. A real-life example for such a required post-deploy
> configuration change is the change of BIOS settings to disable
> hyper-threading in order to address a security vulnerability.
>
> Currently there is no way of changing any BIOS configuration after a node
> is provisioned in Ironic. One solution for it is to allow manual deploy
> steps in Ironic[2](not implemented yet) which can be trigged by changing
> traits in Nova.
>
> For this purpose, we would need to change a trait of the server’s flavor
> in Nova. This trait is mapped to a deploy step in Ironic which does some
> operation(change BIOS config and reboot in this use case).
>
> In Nova, the only API to change trait in flavor is resize whereas resize
> does migration and a reboot as well.
>
> In short, I am  looking for a Nova API that only changes the traits, and
> trigger the ironic deploy steps but no reboot and migration. Please suggest.
>
>
>

Hi, it is possible to modify a flavor (openstack flavor set <flavor>
--property <key>=<value>). However, changes to a flavor are not reflected
in instances that were previously created from that flavor. Internally,
nova stores an 'embedded flavor' in the instance state. I'm not aware of
any API that would allow modifying the embedded flavor, nor any process
that would synchronise those changes to ironic.

Thanks in advance.
>
>
>
> Regards,
>
> Madhuri
>
> [1]
> https://specs.openstack.org/openstack/ironic-specs/specs/not-implemented/support-intel-speed-select.html
>
> [2] https://storyboard.openstack.org/#!/story/2005129
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