rkt is a modern container runtime, built for security, efficiency, and composability. It is one of the container runtimes supported by Kubernetes. But the current implementation (“rktnetes”), is an in-tree implementation and doesn’t support the Container Runtime Interface (CRI), which is an interface created to provide a well defined method for adding support for additional container runtimes to Kubernetes. rkt's work-in-progress CRI implementation is called rktlet.

This presentation will give an update on the rkt project, what new features were implemented recently and what’s coming up. It will then give an update on the state of rktlet: conformance progress, which features are missing, and what workarounds should be removed before it becomes a complete implementation of the CRI.