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Architecture

Kubernetes Architecture​

Kubernetes Master Node​

  • API Server
  • Scheduler
  • Controller (Coordinator of entire cluster) / watches the desired state it manages
  • Distributed key-value store - etcd (distributed key value database, single source of truth)

Kubernetes Worker Nodes​

  • kube-proxy (ensure that communication is running between all the containers)
  • kubelet (report health to etcd and the kubernetes master)
  • Supervisord (Docker and kubelet are packaged into this layer. A process manager where you can run multiple processes, inside one parent process)
  • fluentd (responsible for managing the logs and talking to the central logging service)

Registry​

  • DockerHub
  • GoogleCloud / ECR

image

image

image

image

image

Nodes​

A node is a worker machine in Kubernetes, previously known as aminion. A node may be a VM or physical machine, depending on the cluster. Each node contains the services necessary to run pods and is managed by the master components. The services on a node include the container runtime, kubelet and kube-proxy.

Node Controller​

The node controller is a Kubernetes master component which manages various aspects of nodes.

https://learnk8s.io/kubernetes-node-size

Others​

https://cloudyuga.guru/blog/cloud-controller-manager