CKAD-exercises

Let's practice CKAD questions.

• Curriculum 1.21
• Curriculum 1.29

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1. Certified Kubernetes Application Developer

• Exam Fee: $395 → Let’s catch a discount!
• Exam Duration: 2 hours
• Certification Validity: 2 years
• Total Questions: 16-20, Maximum Score: 100, Passing Score: 66 or above
• Access to resources like kubernetes.io/docs is allowed

2. Curriculum

• See Curriculum 1.29

3. Question Example

Question

• Deploy a nginx image as a Deployment in the namespace hello.
• Set the number of replicas to 3,
• and mount an empty directory at the path /etc/volume.
• The name of the Deployment should be nginx-deploy.

Answer

k create deploy nginx-deploy -n hello - image=nginx --replica=3 --dry-run=client -o yaml > deploy.yaml

  1 apiVersion: apps/v1
  2 kind: Deployment
  3 metadata:
  4   creationTimestamp: null
  5   labels:
  6     app: nginx-deploy
  7   name: nginx-deploy
  8   namespace: hello
  9 spec:
 10   replicas: 3
 11   selector:
 12     matchLabels:
 13       app: nginx-deploy
 14   strategy: {}
 15   template:
 16     metadata:
 17       creationTimestamp: null
 18       labels:
 19         app: nginx-deploy
 20     spec:
 21       containers:
 22       - image: nginx
 23         name: nginx
 24         resources: {}
 25         volumeMounts:             ## add this part
 26         - name: volume
 27           mountPath: /etc/volume
 28       volumes:                    ## add this part
 29       - name: volume
 30         emptyDir: {}
 31 status: {}       

k create -f deploy.yaml

4. How to Practice

Summary

• kubernetes.io/docs

Hands-on Practice!

• Udemy → CKAD, KodeKloud environment
• Various GitHub resources → MicroK8s
• killers.sh

5. Tips

A. Short on Time

• Resolve as much as possible using kubectl.
• For tasks requiring a search, organize resources to quickly find what’s needed.

Examples:

• You can’t create PVs or PVCs with kubectl alone - quickly search on kubernetes.io/docs and grab the YAML.
• When creating a deployment with kubectl, you can’t set env variables, volumes, etc.
• Memorize what’s necessary - quickly find the rest in the documentation.
• Don’t memorize the exact keys for setting secrets/env as env or mount in YAML - they vary slightly different.

B. Script

echo "set ai" >> .vimrc
echo "set nu" >> .vimrc
echo "tabstop=2 shitwidth=2 expandtab" >> .vimrc

do="--dry-run=client -o yaml"
ka="kubectl apply -f"

Run this script in every question (ssh enter)

C. A good camera and your passport properly organized.

Items to Prepare - A good camera - Passport - An organized workspace

6. Some Commands that I'd learn

• kubectl scale
  • k scale deployment metaservice --replicas=3 
• kubectl set image
  • k set image deploy/metaservice metaservice=abis.ahnlab.com/..../metaservice/1.0.x.x
• kubectl number expression
• k get nodes akw{0..9}
• kubectl get ep
• kubectl explain
  • k explain pod.spec 
• kubectl wait
  • k wait --for=condition=Ready pod/busybox1
• helm update -i
• helm install/update --set