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Building a Docker Image with Packer

Packer allows us to create machine images using a number of builders — including Docker images! Built _without_ the use of a Dockerfile, using Packer with Docker requires the use of simple scripts and some metadata changes to get everything up and running. In this lab, we'll do just that by creating a Docker image to deploy a Node.js application.

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Oct 02, 2020

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Table of Contents

  1. Challenge

    Refactor the Dockerfile

    Packer provisions Docker images using the same provisioners as any other image. That said, not all steps in the build will work one-to-one.

    Additionally, the follow Dockerfile instructions can be provided as metadata in the build itself:

    • USER
    • EXPOSE
    • CMD

    These will run as intended with a container launched from the image.

    We'll refactor our template to use the file and shell provisioners to create our script.

  2. Challenge

    Write the Docker Builder Block

    Write the builder block for the Docker builder, and add the relevant post-processors.

  3. Challenge

    Test the Build

    1. Validate the template.
    2. Test the build.

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

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