Why do Kubernetes and Docker work hand in hand?

Let’s see what is docker and kubernetes.

What is kubernetes?

It is an open-source technology that allows the orchestration of the container so whatever container that we make using any of the container technology rather than docker or any different one it allows us to manage those containers and scale up according to the requirement.

What is Docker?

Docker is a container technology that allows a developer to package an entire application within a single container with all the parts which is needed for that particular application so it isolates the entire application from the operating system and packages it into a single container. 

Here we going to see what is differences between docker and kubernetes.

Docker	Kubernetes
Mostly used in CI/CD pipeline for automating builds and deploy the applications	Comes in the picture after the deployments
Docker defines how you package your applications	It defines how you scale and monitor those containers in an entire cluster
It is a container platform to configure, build and distribute containers	It is a system to manage a cluster of containers
No web UI	Defaults kubernetes dashboard which has a web UI for monitoring the clusters for the containers

How Docker and kubernetes work together?

At the time of the local development process, you will be containerizing your applications into a single container using docker and those containers will be deployed to any of the servers using the CI/CD build process. Once those containers are been deployed to any of the staging servers or production servers you have to monitor those containers that time kubernetes comes into the picture, how you monitor, how you scale those containers how you schedule those containers are all been handled by kubernetes, it provides complete orchestration of the containers that we have deployed to the servers.

What is the Docker swarm?

Docker swarm is a tool used to cluster and orchestrate docker containers, here we have some concerns, kubernetes also doing the same thing, then why docker swarm. 

Let’s analyze why docker swarm comes in the frame when we have kubernetes,

Kubernetes	Docker swarm
Complex Installation	Simple installation
It is complex with advanced features and is very powerful also so it has a very higher learning curve	It is light weight and has limited features, so have a low learning curve
Support auto-scaling	Supports manual scaling
It has built-in monitoring tools to monitor containers	It relies on third party monitoring tools
Does not support auto load balancer	Supports auto load balancer
Need for a separate CLI tool	Works with integrated docker CLI tool

You might be thinking which one is better Kubernetes or Docker?

Kubernetes can run without docker and Dockers can run without kubernetes, however best practices to combine both technologies to get the best out.