Chapter summary
Kubernetes is a container orchestrator originally developed at Google and open-sourced and donated to the CNCF in 2014. It was the first project to graduate the CNCF and is now the industry-standard orchestrator and second biggest project on GitHub. It can also orchestrate virtual machines and serverless functions.
A Kubernetes cluster consists of one or more control plane nodes and one or more worker nodes. Control plane nodes run the API server, cluster store, scheduler, controllers, and the API itself. Worker nodes are where user applications run and have a kubelet, container runtime, and kube-proxy.
The API server exposes the API over a RESTful HTTPS interface and requires high-performance control plane nodes. All internal and external Kubernetes traffic goes through the API server. The cluster store is the only stateful part of the control plane and is where the state of the cluster and applications is persisted. The scheduler assigns pods to worker nodes, and...
