Question

A platform team maintains a Kubernetes cluster and wants the freedom to switch between different container runtimes (for example, from one runtime to another) without modifying the kubelet or rebuilding the control plane. Which design element of Kubernetes makes this runtime interchangeability possible?

Accepted Answer

The Container Runtime Interface (CRI), a standardized gRPC API the kubelet uses to communicate with any conforming runtime

Answer

The Container Network Interface (CNI), which standardizes how runtimes attach pods to the network

Answer

The Container Storage Interface (CSI), which lets the kubelet mount volumes from any runtime

Answer

The Open Container Initiative (OCI) image manifest, which the kubelet reads directly to start containers