8: Containerizing an app

Docker is all about making it easy to take application source code and get it running in a container. This process is called containerization.

In this chapter, we’ll walk through the process of containerizing some simple Linux apps. You’ll need a Docker environment if you want to follow along. Any of the environments form the Getting Docker chapter will work.

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 end-to-end process looks like this:

1. Start with your application code and dependencies
2. Create a Dockerfile that describes your app, dependencies, and how to run it
3. Build it into an image by passing the Dockerfile to the docker build command
4. Push the new image to a registry (optional)
5. Run a container from the image

Figure 8.1 shows the...