kaws
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Use rkt as Kubernetes's container runtime
Since kaws is tied to CoreOS and it's safe to say CoreOS will have the best possible support for rkt, we should use rkt as k8s's container runtime instead of Docker, as soon as rkt is 1.0. rkt has much saner tooling (acbuild is significantly better than Dockerfiles) and a better security story (doesn't run as a daemon, signed images, doesn't require a registry, etc.) rkt can run Docker images as well so this change will not preclude the use of Docker images.
Tracking issue for rkt support in k8s: kubernetes/features#58