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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.

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Path Info

Clock icon Intermediate
Clock icon 1h 15m
Clock icon Apr 20, 2023

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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 script executable.

    4. Run the 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.

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