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What service provides a REST API interface into Kubernetes?

  1. Scheduler

  2. API server

  3. etcd

  4. Controller

The correct answer is: API server

The API server is a crucial component of the Kubernetes architecture that provides the primary interface for interacting with the Kubernetes cluster via a REST API. It serves as the central hub for managing communication between different components in the Kubernetes system, such as kubectl (the command-line client for Kubernetes) and the various cluster nodes. This service enables users to perform operations like creating, updating, and deleting resources in the cluster, including pods, services, and deployments. All requests made to the API server modify the cluster state through the persistent storage provided by etcd, the key-value store, but the API server itself is where the RESTful interactions occur. Thus, understanding the role of the API server is essential for effectively managing Kubernetes clusters and exploiting its capabilities, which is why it is identified as the correct answer.