Featured resource
2025 Tech Upskilling Playbook
Tech Upskilling Playbook

Build future-ready tech teams and hit key business milestones with seven proven plays from industry leaders.

Check it out
  • Lab
    • Libraries: If you want this lab, consider one of these libraries.
    • Cloud
Google Cloud Platform icon
Labs

Create a Mutating Admission Controller Webhook with Terraform

In this lab, you will create and deploy a mutating webhook, along with its configuration. First, you will create the webhook Docker image from the provided code. Then, you will update the webhook deployment Terraform code with the image and deploy the mutating webhook. Next, you will apply the webhook registration code to finish up the deployment. Finally, you will create a couple of test Pods to confirm your mutating webhook is working as expected.

Google Cloud Platform icon
Lab platform
Lab Info
Level
Intermediate
Last updated
Sep 21, 2025
Duration
1h 15m

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.
Table of Contents
  1. Challenge

    Lab Setup
    1. Move to the mutating-admission-webhook directory.

    2. Create an access key in the AWS Management Console. (You need to copy the Access key and Secret access key and keep them somewhere safe and accessible for the next step).

    3. Make the lab-setup.sh script executable.

    4. Run the lab-setup.sh script. (Note: This script will run for about 10–15 minutes.)

  2. Challenge

    Create the Webhook Docker Image

    Note: Make sure you have set up your Docker Hub account before doing this objective.

    1. Move into the mutating-webhook directory.

    2. Log in to Docker Hub from the command line.

    3. Update the Makefile with your Docker Hub username.

    4. Build the mutating webhook. (Note: This can take between 5–10 minutes.)

    5. Build the Docker image.

    6. Push the Docker image to Docker Hub.

    7. Deploy the required certificates.

  3. Challenge

    Deploy the Mutating Webhook Configuration and Webhook
    1. Update the deployment configuration with your Docker Hub username.

    2. Initialize the working directory.

    3. Apply the configuration.

  4. Challenge

    Test the Mutating Admission Webhook
    1. Create a directory called test-pods.

    2. Move into to test-pods directory.

    3. Use the sample Terraform code to create two test Pods called test-app-1 and test-app-2, and add a label called hello = "universe" to test-app-2.

    4. Initialize your working directory.

    5. Apply the webhook configuration.

    6. Confirm that your mutating webhook is working:

      • test-app-1 should have a hello=world label, even though one was not provided in the configuration.
      • test-app-2 should have a hello=universe label, as you defined in the configuration.
About the author

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.

Real skill practice before real-world application

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.

Learn by doing

Engage hands-on with the tools and technologies you’re learning. You pick the skill, we provide the credentials and environment.

Follow your guide

All labs have detailed instructions and objectives, guiding you through the learning process and ensuring you understand every step.

Turn time into mastery

On average, you retain 75% more of your learning if you take time to practice. Hands-on labs set you up for success to make those skills stick.

Get started with Pluralsight