Hi, Tao, Thanks for letting us know. Please reach out if anything comes up. Best regards, Iulian ________________________________ Iulian Barbu Email: iul@amazon.com Phone: +40723850616 ________________________________________ From: Peng Tao <bergwolf@hyper.sh> Sent: Thursday, April 16, 2020 9:51 AM To: Barbu, Iulian; kata-dev@lists.katacontainers.io Cc: Iliescu, Radu Subject: RE: [EXTERNAL] [kata-dev] kata-containers and Firecracker's MMDS usage CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe. On 2020/4/16 00:23, Barbu, Iulian via kata-dev wrote:

Hello, everybody,

Hello Barbu,

I am a software engineer, part of Firecracker maintainers team. I am reaching to you because we are working on a breaking change related to MMDS. We are changing the MMDS response content-type to JSON, for requests originating from within the guest, and plan to make a release soon, integrating the related changes. We want to make sure if any known Firecracker customer is impacted by this change.

Can you please tell us if kata-containers is exposing or is planning to expose MMDS to guests applications?

Thanks for reaching out! kata-containers does not expose any MMDS to guest applications at the moment. There were discussions using it for simple container data transfer (such as kubernetes secret map etc.) but it is not implemented. I cannot tell if there is any customer using it internally (If so, it is time to speak out, please!). Other than that, I'd like to say that please feel free to make breaking changes and we'll be glad to use the refined APIs when needed. Cheers, Tao -- Into something rich and strange. Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.