Building a Custom Image Using Podman

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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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Lab Info

Level

Intermediate

Last updated

Sep 19, 2025

Duration

45m

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.
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.
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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