CKA Practice Exam: Part 1

1.5 hours
  • 2 Learning Objectives

About this Hands-on Lab

Services are an important part of accessing pods in Kubernetes. They ensure that the ephemeral nature of pods does not interrupt the end user experience. In this hands-on lab, you’ll be tasked with creating a deployment and a service, making sure you can access the application running on those pods without the potential of service interruptions. This will simulate a question you may receive on the Certified Kubernetes Administrator (CKA) exam.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Create a Deployment Named webapp in the web Namespace and Verify Connectivity
  1. Use the following command to create a namespace named web:

    kubectl create ns web
  2. Use the following command to create a deployment named webapp:

    kubectl run webapp --image=linuxacademycontent/podofminerva:latest --port=80 --replicas=3 -n web
Create a Service Named web-service and Forward Traffic from the Pods
  1. Use the following command to get the IP address of a pod that’s a part of the deployment:

    kubectl get po -o wide -n web
  2. Use the following command to create a temporary pod with a shell to its container:

    kubectl run busybox --image=busybox --rm -it --restart=Never -- sh
  3. Use the following command (from the container’s shell) to send a request to the web pod:

    wget -O- <pod_ip_address>:80
  4. Use the following command to create the YAML for the service named web-service:

    kubectl expose deployment/webapp --port=80 --target-port=80 --type=NodePort -n web --dry-run -o yaml > web-service.yaml
  5. Use Vim to add the namespace and the NodePort to the YAML:

    vim web-service.yaml

    Change the name to web-service, add the namespace web, and add nodePort: 30080.

  6. Use the following command to create the service:

    kubectl apply -f web-service.yaml
  7. Use the following command to verify that the service is responding on the correct port:

    curl localhost:30080
  8. Use the following command to modify the deployment:

    kubectl edit deploy webapp -n web
  9. Add the liveness probe and the readiness probe:

    livenessProbe:
      httpGet:
        path: /healthz
        port: 8081
    readinessProbe:
      httpGet:
        path: /
        port: 80
  10. Use the following command to check if the pods are running:

    kubectl get po -n web
  11. Use the following command to check if the probes were added to the pods:

    kubectl get po <pod_name> -o yaml -n web --export

Additional Resources

You have been given access to a three-node cluster. Within that cluster, you will be responsible for creating a service for end users of your web application. You will ensure the application meets the specifications set by the developers and proper resources are in place to ensure maximum uptime for the app. You must perform the following tasks in order to complete this hands-on lab:

  • All objects should be in the web namespace.
  • The deployment name should be webapp.
  • The deployment should have three replicas.
  • The deployment’s pods should have one container using the linuxacademycontent/podofminerva image with the tag latest.
  • The service should be named web-service.
  • The service should forward traffic to port 80 on the pods.
  • The service should be exposed externally by listening on port 30080 on each node.
  • The pods should be configured to check the /healthz endpoint on port 8081 and automatically restart the container if the check fails.
  • The pods should be configured to not receive traffic until the endpoint on port 80 responds successfully.
What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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