Building images with Docker Compose

To demonstrate how to build a Docker image using Docker Compose, we need a small application. Proceed as follows:

1. In the chapter’s folder (ch11), create a subfolder, step2, and navigate to it:

   mkdir step2 && cd step2

2. From the previous exercise, copy the db folder containing the database initialization script to the step2 folder and also copy the docker-compose.yml file:

   $ cp -r ../step1/db .$ cp ../docker-compose.yml .

3. Create a folder called web in the step2 folder. This folder will contain a simple Express.js web application.
4. Add a file called package.json to the folder with this content:

Figure 11.8 – The package.json file of the sample web application

Note

If you prefer not to type yourself, you can always download the files from the sample solution: https://github.com/PacktPublishing/The-Ultimate-Docker-Container-Book/tree/main/sample-solutions/ch11/step2.

5. Create...