Packaging images

So far, we have been quite happily downloading prebuilt images from the Docker Hub to test with. Next up, we are going to be looking at creating our own images. Before we dive into creating images using third-party tools, we should have a quick look at how to go about building them in Docker.

An application

Before we start building our own images, we should really have an application to "bake" into it. I suspect you are probably getting bored of doing the same WordPress installation over and over again. We are going to be looking at something completely different.

So, we are going to build an image that has Moby Counter installed. Moby counter is an application written by Kai Davenport, who describes it as follows:

"A small app to demonstrate keeping state inside a docker-compose application."

The application runs in a browser and will add a Docker logo to the page wherever you click, the idea being that it uses a Redis or Postgres backend to store the number of Docker logos...