Container Runtime Interface (CRI) in Kubernetes

Editor’s note: this post is part of a series of in-depth articles on what’s new in Kubernetes 1.5

At the lowest layers of a Kubernetes node is the software that, among other things, starts and stops containers. We call this the “Container Runtime”. The most widely known container runtime is Docker, but it is not alone in this space. In fact, the container runtime space has been rapidly evolving. As part of the effort to make Kubernetes more extensible, we’ve been working on a new plugin API for container runtimes in Kubernetes, called “CRI”.

What is the CRI and why does Kubernetes need it?
Each container runtime has it own strengths, and many users have asked for Kubernetes to support more runtimes. In the Kubernetes 1.5 release, we are proud to introduce the Container Runtime Interface (CRI) — a plugin interface which enables kubelet to use a wide variety of container runtimes, without

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