Challenge, Easy,  on  Kubernetes

Pod, Service, and Cross-Namespace DNS Resolution

Scenario

Create a Pod named orbit-api in the blackhole namespace using the image nginx:alpine. Apply the label project=orbit-api and mount the existing ConfigMap orbit-index as a volume at /usr/share/nginx/html so nginx serves the provided index.html.

Expose the Pod by creating a ClusterIP Service named orbit-svc in the blackhole namespace. Configure the Service to listen on port 4444 and forward traffic to container port 80, using the label selector project=orbit-api.

From the default namespace, create a temporary Pod named client-pod using the busybox image. Use this Pod to make an HTTP request to the Service using its DNS name:

http://orbit-svc.blackhole.svc.cluster.local:4444

Save the output of the request on dev-machine:

/home/laborant/orbit-test.html

Ensure the saved file contains the response served by nginx, confirming successful service exposure and cross-namespace DNS resolution.

💡 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 pod-service-and-cross-namespace-dns-resolution-0c8b478a

This will create a local copy of the challenge content in a directory named pod-service-and-cross-namespace-dns-resolution-0c8b478a. You only need to do this once per challenge.

Stream your changes

labctl content push -fw challenge pod-service-and-cross-namespace-dns-resolution-0c8b478a

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