Can you tell me about the principles of operation and the main components of Kubernetes?

Kubernetes is a container orchestration system that automates deployment, scaling, and management of containerized applications.

Main components of Kubernetes:

• Master Node — responsible for managing the cluster. Includes:

  • API Server — interface for interacting with the cluster.
  • Scheduler — distributes tasks across worker nodes.
  • Controller Manager — monitors the cluster state and maintains the desired state.
  • etcd — distributed configuration and state storage.

• Worker Nodes — run application containers. Includes:

  • kubelet — agent managing containers on the node.
  • kube-proxy — provides network communication.
  • Container Runtime — container execution environment (e.g., Docker).

Working principle:

1. User sends manifests describing the desired state via API Server (e.g., how many pods should be running).
2. Scheduler distributes pods across nodes.
3. Controller Manager ensures the current state matches the desired state.
4. kubelet on worker nodes starts and maintains containers.

Thus, Kubernetes provides automatic management of container lifecycle, scaling, and updating.