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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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Lab platform
Lab Info
Level
Intermediate
Last updated
Sep 20, 2025
Duration
30m

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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
    • ENTRYPOINT
    • WORKDIR
    • 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.
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