Challenge, Medium,  on  Kubernetes

Kubernetes QoS Classes and Resource Management

Scenario

You are working in a Kubernetes cluster as a cluster administrator. You need to understand and manage Quality of Service (QoS) classes to ensure proper resource allocation and pod eviction priorities.

Task

Create a Deployment named guaranteed-deploy in the dev namespace with:

  • 3 replicas
  • Image: nginx
  • The pod must have the label app=guaranteed.
  • Ensure the Pods have the Guaranteed QoS class

Identify the QoS class of all Pods running in the dev namespace and save the result to /home/laborant/qos-class-dev.txt. The output must be formatted as a table:

NAME           QOS
pod-name       qos-class

Determine which Pods will be terminated first if the node runs out of resources (based on QoS priority). Save the names of those Pods to: /home/laborant/early-terminate-pod.txt

Hint
  • Use custom-columns to format the output as a table with NAME and QOS columns.
  • We can manually save the name of the Pod that was terminated when the node ran out of resources in a file called early-terminate-pod.txt, for example: echo "pod1" >> early-terminate-pod.txt

Test Cases

How to Author Challenges on iximiuz Labs

Instead of providing a subpar online editing experience, iximiuz Labs offers a helper CLI tool called labctl, allowing you to use your favorite text editor (or a full-featured IDE) to write content from the comfort of your local machine.

Install labctl CLI

curl -sf https://labs.iximiuz.com/cli/install.sh | sh

This will download and install the latest version of the labctl CLI. You only need to do this once per workstation.

Authorize labctl

labctl auth login

This will open a browser window asking you to authorize labctl to access your account. You need to do it after a fresh install of labctl and repeat it whenever the auth session expires.

Pull challenge content

labctl content pull challenge kubernetes-qos-classes-and-resource-management-6f5cf7d9

This will create a local copy of the challenge content in a directory named kubernetes-qos-classes-and-resource-management-6f5cf7d9. You only need to do this once per challenge.

Stream your changes

labctl content push -fw challenge kubernetes-qos-classes-and-resource-management-6f5cf7d9

Run this command in a separate terminal to continuously upload your changes to the server while editing the challenge in your favorite text editor or IDE.

You can also use labctl to create, list, and delete your content. Learn more about the available commands: labctl content --help

Start challenge