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Creating a Mutating Admission Controller Webhook for Kubernetes

Admission controllers affect what actions we let occur on our Kubernetes clusters, either by validating and approving or denying them, or by changing the actual API request objects itself. To alter these objects, we leverage a MutatingAdmissionsWebhook, which parses and updates the object before validation and deployment. In this lab, we'll write one of these webhooks!

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Mar 30, 2023

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Table of Contents

  1. Challenge

    Write Response

    Within the webhooks/label-add-webhook/ directory, update the app/server.js file to create a response object.

  2. Challenge

    Create JSON Patch

    Generate a file containing the label information in the appropriate format. Encode it and add it to the response object.

  3. Challenge

    Deploy and Test

    If using your own image:

    1. Generate certs.
    2. Update label-add-webhook-registration.yaml with the Base64-encoded output of app/ca.crt.
    3. Log in to Docker; tag and push to repo.
    4. Update label-add-webhook-deploy.yaml with your user name instead of linuxacademycontent.
    5. Deploy webhook and test as described in the instructions.

    If using the provided test image: Deploy webhook as described in the instructions.

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!

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