Linux Foundation CKA Online Practice Questions and Exam Preparation

Linux Foundation CKA Online Questions & Answers

• Question 71:

  SIMULATION

  Create a deployment as follows: Name: nginx-random Exposed via a service nginx-random Ensure that the serviceand; pod are accessible via their respective DNS records The container(s) within any pod(s) running as a part of this deployment should use the nginx Image Next, use the utility nslookup to look up the DNS records of the service and pod and write the output to /opt/KUNW00601/service.dns and /opt/KUNW00601/pod.dns respectively.

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  Solution:

  

  

• Question 72:

  SIMULATION

  List the nginx pod with custom columns POD_NAME and POD_STATUS

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  kubectl get po -o=custom-columns="POD_NAME:.metadata.name, POD_STATUS:.status.containerStatuses[].state"

• Question 73:

  SIMULATION

  You must connect to the correct host.

  Failure to do so may result in a zero score.

  [candidate@base] $ ssh Cka000049

  Task

  Perform the following tasks:

  Create a new PriorityClass named high-priority for user-workloads with a value that is one less than the highest existing user-defined priority class value.

  Patch the existing Deployment busybox-logger running in the priority namespace to use the high-priority priority class.

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  Solution:

  

  

• Question 74:

  SIMULATION You must connect to the correct host. Failure to do so may result in a zero score. [candidate@base] $ ssh cka000058

  Context

  You manage a WordPress application. Some Pods are not starting because resource requests are too high.

  Task

  A WordPress application in the relative-fawn namespace consists of: A WordPress Deployment with 3 replicas.

  Adjust all Pod resource requests as follows: Divide node resources evenly across all 3 Pods. Give each Pod a fair share of CPU and memory.

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  Explanation Step 1: SSH into the correct host

  ssh cka000058 Required. Skipping this step results in a zero score.

  Step 2: Get total node resources (CPU and memory)

  Run:

  kubectl describe node | grep -A5 "Capacity"

  OR

  kubectl get nodes -o jsonpath="{.items[*].status.capacity}"

  Note the values for:

  cpu (e.g., 6 cores)

  memory (e.g., 12Gi = 12288Mi)

  Step 3: Divide node resources by 3 Pods

  Example (assuming node has 6 CPUs and 12Gi memory): CPU per Pod: 2000m Memory per Pod: 4096Mi

  Step 4: Edit the WordPress Deployment in the relative-fawn namespace

  kubectl edit deployment wordpress -n relative-fawn

  In the container spec, set the resource requests (under containers:) like this:

  resources:

  requests:

  cpu: "2000m"

  memory: "4096Mi"

  If there are limits defined, make sure they are equal to or greater than requests.

  Step 5: Save and Exit

  In vi: press Esc, type :wq, and press Enter.

  Step 6: Verify the Pods start successfully

  kubectl get pods -n relative-fawn kubectl describe pod -n relative-fawn

  Ensure all 3 WordPress pods are in Running state and not stuck in Pending.

• Question 75:

  SIMULATION

  

  Schedule a pod as follows:

  1. Name: nginx-kusc00101

  2. Image: nginx

  3. Node selector: disk=ssd

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  Solution:

  

  

  

• Question 76:

  SIMULATION

  List all persistent volumes sorted by capacity, saving the full kubectl output to /opt/KUCC00102/volume_list. Use kubectl 's own functionality for sorting the output, and do not manipulate it any further.

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  Solution:

  

• Question 77:

  SIMULATION

  Get list of all pods in all namespaces and write it to file "/opt/pods-list.yaml"

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  kubectl get po -all-namespaces > /opt/pods-list.yaml

• Question 78:

  SIMULATION

  

  Context An existing Pod needs to be integrated into the Kubernetes built-in logging architecture (e.g.kubectl logs). Adding a streaming sidecar container is a good and common way to accomplish this requirement. Task

  Add a sidecar container named sidecar, using the busybox Image, to the existing Pod big- corp-app. The new sidecar container has to run the following command:

  

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  Solution:

  

  

  

• Question 79:

  SIMULATION

  Quick Reference

  ConfigMaps,

  Documentation Deployments,

  Namespace

  You must connect to the correct host.

  Failure to do so may result in a zero score.

  [candidate@base] $ ssh cka000048b

  Task

  An NGINX Deployment named nginx-static is running in the nginx-static namespace. It is configured using a ConfigMap named nginx-config. First, update the nginx-config ConfigMap to also allow TLSv1.2 connections. You may re-create, restart, or scale resources as necessary. You can use the following command to test the changes:

  [candidate@cka000048b] $ curl --tls-max 1.2 https://web.k8s.local

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  1. SSH into the correct host:

  ssh cka000048b

  2. Edit the ConfigMap

  kubectl edit configmap nginx-config -n nginx-static

  Locate the configuration section that defines allowed protocols, typically under ssl_protocols, and ensure TLSv1.2 is allowed, e.g.:

  ssl_protocols TLSv1.2 TLSv1.3;

  If only TLSv1.3 is present, add TLSv1.2 to the list. Save and exit the editor.

  3. Restart the NGINX pods to apply the updated ConfigMap

  Since NGINX doesn't auto-reload config from a ConfigMap, restart the pods:

  kubectl rollout restart deployment nginx-static -n nginx-static

  OR manually delete pods:

  kubectl delete pod -l app=nginx-static -n nginx-static

  4. Test the connection

  Run:

  curl --tls-max 1.2 https://web.k8s.local

  You should get a valid HTTPS response if TLSv1.2 is accepted.

• Question 80:

  SIMULATION

  Create a pod that having 3 containers in it? (Multi-Container)

  Correct Answer. Check the answer in explanation.
  Check the answer in explanation.

  ---

  image=nginx, image=redis, image=consul Name nginx container as "nginx-container" Name redis container as "redis-container" Name consul container as "consul-container" Create a pod manifest file for a container and append container section for rest of the images kubectl run multi-container --generator=run-pod/v1 --image=nginx -- dry-run -o yaml > multi-container.yaml # then vim multi-container.yaml apiVersion: v1 kind: Pod metadata: labels: run: multi-container name: multi-container spec: containers:

  image: nginx name: nginx-container

  image: redis name: redis-container

  image: consul name: consul-container restartPolicy: Always