What is Kubernetes?

Kubernetes is a container orchestrator just like a helmsman of a ship. It ensures to keep the number of containers running all the time based on the requirement configured.

Why do we need it?

Container technologies can't scale well. There are limitations to scale them.
To ensure to maintain SRE level requirements and ensure no downtime of the applications.

How it works?

It works based on the concept of master and worker node, where everything is controlled by master or a control plane and actual jobs will be done by the worker nodes.

What are the components of Master?

1) apiserver
2) Controller Manager
3) Storage (key value pair etcd)
4) Scheduler

What are the components of Worker?

1) Kubelet
2) Docker engine
3) Container runtime