Building a Docker Image via Dockerfile

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Building a Docker Image via Dockerfile

When creating Docker images for websites, applications, and any service that may require any code change in the future, it's best to build in a way that can be quickly and easily rebuilt when any changes occur. Dockerfiles provide an in-platform way to do just that. In this lab, we'll be building a Dockerfile that can generate an image of our website that will make sure that when changes happen with the website code, we won't have to change the Dockerfile itself!

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Lab Info

Level

Beginner

Last updated

Sep 23, 2025

Duration

15m

Challenge

Create the Dockerfile
The Dockerfile can be created in a number of ways, so long as it meets expectations. The following nine steps are suggested:
1. Define the desired container.
2. Update the packages on the container.
3. Install Nginx.
4. Update the Nginx configuration.
5. Create the location of the website files.
6. Set the working directory to that of the website.
7. Copy over website files, ensuring that Nginx is the owner.
8. Expose port 80.
9. Run Nginx at /tmp/nginx.pid; ensure Nginx is not set to run as a daemon.
Challenge

Test the Image
1. Use docker build to generate an image based on the provided Dockerfile
2. Create a web01 container based on the image, ensuring port 80 on the container maps to 80 on the host and the container is launched in the background.

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