Sample CKAD exercises and solutions

• A set of sample questions and solutions to assist in preparing for the CKAD exam.
• Assumed practice environment is Docker Desktop with a Windows Subsystem for Linux backend.

Disclaimer

• Opinions expressed here are solely my own and do not express the views or opinions of JPMorgan Chase.
• Any third-party trademarks are the intellectual property of their respective owners and any mention herein is for referential purposes only.

Questions by Domain

• Example CKAD Application Design and Build Q&A
• Example CKAD Application Environment, Configuration and Security Q&A
• Example CKAD Application Deployment Q&A
• Example CKAD Services and Networking Q&A
• Example CKAD Observability and Maintenance Q&A
• Example CKAD Miscellaneous Q&A

Docker Desktop Setup

Linux access to Docker desktop

• Windows Subsystem for Linux requires you to install a Linux distribution from the Microsoft Store.
  • Tick the 'Use the WSL 2 based engine' under the 'General' panel
• To mimic the CKAD exam please execute all the commands in this repo from this Linux distribution that you installed.
  • The CKAD exam terminal is Ubuntu based.
• Start the distribution directly by searching for Ubuntu and starting the application

Prerequisite software for Docker desktop

Please install these three software components, required to answer questions in later sections:

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Metrics Server

By default the metrics server required for the kubectl top command is not present on Docker Desktop.

Please install the metrics server with the following command:

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

kubectl patch deployment metrics-server -n kube-system --type 'json' -p '[{"op": "add", "path": "/spec/template/spec/containers/0/args/-", "value": "--kubelet-insecure-tls"}]'

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Contour Ingress

By default the Contour Ingress required for the Ingress Networking question is not present on Docker Desktop.

Please install the contour ingress with the following command:

kubectl apply -f https://projectcontour.io/quickstart/contour.yaml

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Calico

Calico is required for the non native Kubernetes resources lookup question.

curl https://docs.projectcalico.org/manifests/calico.yaml | kubectl apply -f -

Logistics

• The current version of Kubernetes in the CKAD exam can be found here.
• This has been tested on Docker Desktop v4.0.1.
• To remove all the resources that get created run the commands in the Clean Up section.

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