Kubernetes is an open-source container orchestration platform that automates deploying, scaling and managing containerized applications. A cluster has a control plane and worker nodes that run the containers.
Control plane components:
kube-apiserverexposes the API, validates requests, and is the hub every component talks to.etcdis a distributed key-value store for cluster state and configuration.kube-schedulerassigns Pods to nodes by resource needs and constraints.kube-controller-managerruns controllers that drive actual state toward desired state.
Worker node components:
kubeletruns the Pods scheduled to its node.kube-proxymaintains the network rules that load-balance Service traffic.- The container runtime, such as containerd or CRI-O, runs the containers. Built-in Docker Engine support ended in v1.24.
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