Challenge, Medium,  on  Kubernetes

Schedule Pods Using Taints, Tolerations and Node Affinity

Scenario

A node in your Kubernetes cluster is tainted with key dedicated, value prod, and effect NoSchedule. The same node is labeled with dedicated=prod.

Create a Deployment named web-app in the prod namespace using the nginx image with 2 replicas. Configure the Deployment with appropriate tolerations and required node affinity so that the pods are scheduled only on the tainted and labeled node.

Finally, verify that all pods in the prod namespace are in the Running state and confirm that they are scheduled on the intended node.

Do not remove the taint or modify the existing node configuration.

Hint

You need two things in your Deployment spec:

  1. tolerations — to allow scheduling on the tainted node-02
  2. affinity.nodeAffinity.requiredDuringSchedulingIgnoredDuringExecution — to force scheduling only on nodes labeled dedicated=prod

💡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 scheduling-pods-with-taints-affinity-d466e93e

This will create a local copy of the challenge content in a directory named scheduling-pods-with-taints-affinity-d466e93e. You only need to do this once per challenge.

Stream your changes

labctl content push -fw challenge scheduling-pods-with-taints-affinity-d466e93e

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