[openstack-dev] [zun] sandbox and clearcontainers

Surya.Prabhakar at dell.com Surya.Prabhakar at dell.com
Tue Jul 11 23:13:48 UTC 2017

Dell - Internal Use - Confidential

Hi Folks,
        I am just trying to wrap my head around zun's sandboxing and clear containers.   From what Hongbin told in Barcelona ( see the attached pic which I scrapped from his video)

[cid:image001.jpg at 01D2FAA3.AE2FD7F0]

current implementation in Zun is, Sandbox is the outer container and the real user container is nested inside the sandbox.  I am trying to figure out how this is going to play out
when we have clear containers.

I envision the following scenarios:

1)      Scenario 1: where the sandbox itself is a clear container and user will nest another clear container inside the sandbox. This is like nested virtualization.

But I am not sure how this is going to work since the nested containers won't get VT-D cpu flags.

2)      Scenario 2: the outer sandbox is just going to be a standard docker container without vt-d and the inside container is going to be the real clear container with vt-d.  Now this

might work well but we might be losing the isolation features for the network and storage which lies open in the sandbox. Wont this defeat the whole purpose of using clear containers.

I am just wondering what is the thought process for this design inside zun.  If this is trivial and if I am missing something please shed some light :).

Surya ( spn )
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