Introduction to the Container Runtime Interface (CRI)

In Kubernetes, Pods are introduced to describe a cohesive unit of Service, where multiple cooperating processes are running as containers with shared storage, network, etc. To better manage these Pods, a component called kubelet is running as a daemon on every node. The kubelet plays a crucial role in the Kubernetes system. It is the primary implementer of Pods and the driver of the container execution layer. It is kubelet that makes Pods into a group of running containers. However, kubelet itself doesn’t directly manage the lifecycle of containers. A container engine, also known as a container runtime, is invoked to do low-level container management, such as loading ...