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36 lines
1.8 KiB
Markdown
36 lines
1.8 KiB
Markdown
# Kubernetes support
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[Kubernetes](https://github.com/kubernetes/kubernetes/), or K8s, is a popular open source
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container orchestration engine. In Kubernetes, a set of containers sharing resources
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such as networking, storage, mount, PID, etc. is called a
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[pod](https://kubernetes.io/docs/user-guide/pods/).
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A node can have multiple pods, but at a minimum, a node within a Kubernetes cluster
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only needs to run a container runtime and a container agent (called a
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[Kubelet](https://kubernetes.io/docs/admin/kubelet/)).
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Kata Containers represents a Kubelet pod as a VM.
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A Kubernetes cluster runs a control plane where a scheduler (typically
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running on a dedicated master node) calls into a compute Kubelet. This
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Kubelet instance is responsible for managing the lifecycle of pods
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within the nodes and eventually relies on a container runtime to
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handle execution. The Kubelet architecture decouples lifecycle
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management from container execution through a dedicated gRPC based
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[Container Runtime Interface (CRI)](https://github.com/kubernetes/design-proposals-archive/blob/main/node/container-runtime-interface-v1.md).
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In other words, a Kubelet is a CRI client and expects a CRI
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implementation to handle the server side of the interface.
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[CRI-O](https://github.com/kubernetes-incubator/cri-o) and
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[containerd](https://github.com/containerd/containerd/) are CRI
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implementations that rely on
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[OCI](https://github.com/opencontainers/runtime-spec) compatible
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runtimes for managing container instances.
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Kata Containers is an officially supported CRI-O and containerd
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runtime. Refer to the following guides on how to set up Kata
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Containers with Kubernetes:
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- [How to use Kata Containers and containerd](../../how-to/containerd-kata.md)
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- [Run Kata Containers with Kubernetes](../../how-to/run-kata-with-k8s.md)
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