Kubernetes container runtimes
Kubernetes originally only supported Docker as a container runtime engine. But that is no longer the case. Kubernetes now supports any runtime that implements the CRI interface.
In this section, you’ll get a closer look at the CRI and get to know some runtime engines that implement it. At the end of this section, you’ll be able to make a well-informed decision about which container runtime is appropriate for your use case and under what circumstances you may switch or even combine multiple runtimes in the same system.
The Container Runtime Interface (CRI)
The CRI is a gRPC API, containing specifications/requirements and libraries for container runtimes to integrate with the kubelet on a node. In Kubernetes 1.7 the internal Docker integration in Kubernetes was replaced with a CRI-based integration. This was a big deal. It opened the door to multiple implementations that can take advantage of advances in the container world. The...
