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Configuring and Implementing Kubernetes Admission Controllers

Kubernetes provide plugins called admission controllers that govern and enforce how the cluster is used. In this hands-on lab, you will be tasked with configuring an admission controller and deploying to a namespace in order to set default memory limits and requests.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Published
Clock icon Mar 24, 2023

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Table of Contents

  1. Challenge

    Enable the LimitRanger Admission Controller

    • Use a text editor to modify the kube-apiserver.yaml and ensure that the LimitRanger admission controller is enabled.
    • Validate that the kube-apiserver pod redeploys successfully by issuing a simple kubectl command (the pod can take several seconds to redeploy).

  2. Challenge

    Create a LimitRange Resource in the dev Namespace

    • Create a manifest file called mem-limit.yaml with the following specifications:

      Note: performing a copy paste directly from the objective will result in additional spaces being added. To remove additional spaces, either copy to a text editor on your computer before copying to the file on the host or manually remove the spaces once you have copied the file.

    apiVersion: v1
kind: LimitRange
metadata:
  name: mem-limit-range
  namespace: dev
spec:
  limits:
  - default:
      memory: 512Mi
    defaultRequest:
      memory: 256Mi
    type: Container
    • Use the kubectl command to deploy the manifest file.

  3. Challenge

    Create Two Pods in the dev Namespace

    • View the contents of the nginx-pod.yaml file in the /home/cloud_user directory (take note of any memory requests or limits, if they appear):
      • Use the kubectl command to deploy the manifest.
      • Use the kubectl command to print information about the pod in YAML format (pay attention to the memory request and limit).
    • View the contents of the test-pod.yaml file in the /home/cloud_user directory (take note of any memory requests or limits, if they appear):
      • Use the kubectl command to deploy the manifest.
      • Use the kubectl command to print information about the pod in YAML format (pay attention to the memory request and limit).
A Cloud Guru - Labs - Configuring and Implementing Kubernetes Admission Controllers
Author
A Cloud Guru

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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