8: Containerizing an app

Docker is all about taking applications and running them in containers.

The process of taking an application and configuring it to run as a container is called “containerizing”.

In this chapter, we’ll walk through the process of containerizing a simple Linux-based web application. If you don’t have a Linux Docker environment to follow along with, you can use Play With Docker for free. Just point your web browser to https://play-with-docker.com and spin up some Linux Docker nodes. It’s my favourite way to spin up Docker and do testing!

We’ll split this chapter into the usual three parts:

• The TLDR
• The deep dive
• The commands

Let’s containerize an app!

Containerizing an app - The TLDR

Containers are all about making apps simple to build, ship, and run.

The process of containerizing an app looks like this:

1. Start with your application code and dependencies
2. Create a Dockerfile that describes your...