Docker

Docker is a tool designed to make DevOps (and your life) easier. With Docker, a developer can create, deploy, and run applications in containers. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package.

Comparing apps deployed to a host vs. an app packaged in a container
Comparing apps deployed to a host vs. an app packaged in a container

Using containers, developers can easily (re)deploy an image to any OS. Just install Docker, execute a command, and your application is up and running. Oh, and don’t worry about any inconsistency with the new version of libraries in the host OS. Additionally, you can launch more containers on the same host—will it be the same app or another? It doesn’t matter.

Seems like Docker is an awesome tool. But how and where should I launch containers?

There are a lot of options for how and where to run containers: AWS Elastic Container Service (AWS Fargate or a reserved instance with horizontal and vertical auto-scaling); a cloud instance with predefined Docker image in Azure or Google Cloud (with templates, instance groups, and auto-scaling); on your own server with Docker; or, of course, Kubernetes! Kubernetes was created especially for virtualization and containers by Google’s engineers in 2014.

Kubernetes? What is that?

Kubernetes is an open-source system which allows you to run containers, manage them, automate deploys, scale deployments, create and configure ingresses, deploy stateless or stateful applications, and many other things. Basically, you can launch one or more instances and install Kubernetes to operate them as a Kubernetes cluster. Then get the API endpoint of the Kubernetes cluster, configure kubectl (a tool for managing Kubernetes clusters) and Kubernetes is ready to serve.

So why should I use it?

With Kubernetes, you can utilize computational resources to a maximum. With Kubernetes, you will be the captain of your ship (infrastructure) with Kubernetes filling your sails. With Kubernetes, your service will be HA. And most importantly, with Kubernetes, you will save a good deal of money.

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