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kata-containers/docs/design/architecture/kubernetes.md
James O. D. Hunt db411c23e8 docs: Split k8s info out of arch doc 
Move the Kubernetes information out of the architecture doc and into a
separate file.

Partially fixes: .

Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
2021-12-16 14:18:47 +00:00

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Kubernetes support

Kubernetes, or K8s, is a popular open source container orchestration engine. In Kubernetes, a set of containers sharing resources such as networking, storage, mount, PID, etc. is called a pod.

A node can have multiple pods, but at a minimum, a node within a Kubernetes cluster only needs to run a container runtime and a container agent (called a Kubelet).

Kata Containers represents a Kubelet pod as a VM.

A Kubernetes cluster runs a control plane where a scheduler (typically running on a dedicated master node) calls into a compute Kubelet. This Kubelet instance is responsible for managing the lifecycle of pods within the nodes and eventually relies on a container runtime to handle execution. The Kubelet architecture decouples lifecycle management from container execution through a dedicated gRPC based Container Runtime Interface (CRI).

In other words, a Kubelet is a CRI client and expects a CRI implementation to handle the server side of the interface. CRI-O and containerd are CRI implementations that rely on OCI compatible runtimes for managing container instances.

Kata Containers is an officially supported CRI-O and containerd runtime. Refer to the following guides on how to set up Kata Containers with Kubernetes: