Preparing for Kubernetes interviews.md

What is kubernetes ?

• kubernetes is an open source orchestration tool for Docker containers( kubernetes supports also rkt as a replacement for docker).
• It automates the deployment + scaling + management of Docker containers across clusters of physical or virtual machines .

How it's related to Docker (or Rkt)?

• Docker manage the life cycle of a container (run,stop,start etc... a container), kubernetes (specifically kubelet) instructs or delegate Docker to do this task on a specific machine.

What is a cluster in kubernetes ?

• it's the physical machines or the virtual ones that the kubernetes platform is deployed on, mainly it's composed from a master machine and nodes.

What are the componments of kubernetes?

• Master components:
  • etcd
  • kube-controller-manager
  • kube-scheduler
  • addons
• Node componements:
  • kubelet
  • docker (or rkt)
  • supervisord
  • kube-proxy
  • fluentId

What is a namespace in kubernetes?

• when we have multiple users who are working on the same kubernetes cluster , we use namespaces to divide cluster ressources between the cluster users for security reasons.

Great :)