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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
Published
Clock icon Feb 11, 2022

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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.

A Cloud Guru - Labs - Building a Custom Image Using Podman
Author
A Cloud Guru

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.

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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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