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Not quite - rkt will bring up a new VM for each container, this approach only brings up a VM per pod (ie, a set of functionally related containers).

This isn't correct. rkt does a VM per pod.

Yes, this is a similar concept. A pod (1 or more containers) is wrapped in a VM. I believe Hyper uses Xen and rkt uses lkvm.

No, it is HyperContainer.