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Building a Custom Image Using Podman

For this lab, we will be creating a Dockerfile that will start a web server using a custom configuration file copied from the host system. The web server will listen on a non-standard port. Upon completion, you will have a working understanding of Dockerfiles and how to build a custom image from them. *This lab is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 45m
Last updated
Clock icon Aug 28, 2025

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Table of Contents

  1. Challenge

    Set Up a New Build Directory

    Create a new build directory. Then, copy the Dockerfile, along with any .zip and .tar files, from /home/cloud_user and add them to the build directory.

  2. Challenge

    Complete the Dockerfile

    Complete the Dockerfile. The following should be completed in the Dockerfile:

    • Start with the image registry.access.redhat.com/ubi8/ubi:8.4.
    • Set yourself as the maintainer and provide a description using LABEL.
    • Install nginx and unzip packages into the image.
    • Set a variable named PORT to a value of 90.
    • Use the variable PORT to expose port 90 in the image.
    • Import the file nginx.zip to /tmp.
    • Unzip the nginx.zip file to /etc/nginx.
    • Import and extract the file llama_cart.tar to /usr/share/nginx/html/.
    • Import the file llama_cart.tar to the working directory /tar_file without uncompressing it.
    • #Set the container to start nginx with options "-g" and "daemon off;". Make "-g" and "daemon off;" overwritable by Podman run arguments.

    Note: The draft Dockerfile also contains these notes presented as comments.

  3. Challenge

    Build and Test the New Image

    • Build the new container image with the following information:

      • Name the image llama-cart.
      • Tag the image v1.

    • Start a new container named llama-cart and expose port 90 in the container to port 8090 on the localhost.

    • Verify the website is available on port 8090 of the system using a web browser.

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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

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!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.
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