Tell me about the architecture of Kubernetes, what does it consist of?

Kubernetes is a container orchestration system composed of several key components:

• Master Node:

  • API Server: accepts REST requests and interacts with other components.
  • Scheduler: distributes pods across worker nodes based on resources and policies.
  • Controller Manager: monitors the cluster state, manages controllers (replication, updates, etc.).
  • etcd: a distributed configuration and state storage.

• Worker Nodes:

  • Kubelet: an agent that runs and monitors containers on the node.
  • Kube-proxy: provides network routing and load balancing.
  • Container Runtime: environment for running containers (e.g., Docker, containerd).

• Kubernetes Objects:

  • Pod: the smallest deployable unit, contains one or more containers.
  • Service: an abstraction for accessing pods.
  • Deployment, StatefulSet, DaemonSet: controllers for managing the lifecycle of pods.

The architecture is based on the principle of separation of responsibilities among components, ensuring scalability, fault tolerance, and automation of container management.