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2025 Linux Foundation CKA: Fantastic Cert Certified Kubernetes Administrator (CKA) Program Exam Exam

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Linux Foundation Certified Kubernetes Administrator (CKA) Program Exam Sample Questions (Q67-Q72):

NEW QUESTION # 67
You have a Kubernetes cluster with two worker nodes and a single Nginx service deployed. You want to expose this service externally using a LoadBalancer service type but only want traffic to be directed to pods on a specific worker node. How would you achieve this?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Node Selector:
- Create a Node Selector label on the worker node where you want to host the Nginx pods.
- Example:

- Apply this configuration using 'kubectl apply -f node-config.yaml'. 2. Configure the Deployment: - Update the Nginx deployment to include the Node Selector label in its pod template. - Example:

- Apply the updated deployment configuration using 'kubectl apply -f nginx-deployment.yamr. 3. Create a LoadBalancer Service: - Create a LoadBalancer type service that selects the Nginx pods with the 'app=nginx' label. - Example:

- Apply the service configuration using 'kubectl apply -f nginx-service.yamP. 4. Verify the Deployment: - Confirm the deployment of the Nginx pods on the specified worker node using 'kubectl get pods -l app=nginx -o wide'. - Check the LoadBalancer service's external IP address using 'kubectl get services nginx-service'. - Access the Nginx service using the external IP address. All traffic should be routed to the pods on the worker node with the 'worker-type: nginx' label. ---

NEW QUESTION # 68
You have a StatefulSet named 'database-statefulset' that runs a database service. The database requires persistent data storage. You are experiencing a problem where the database pods are crashing repeatedly, and the database data is getting lost. You suspect that there is an issue with the persistent volume claim (PVC) used by the StatefulSet. How would you troubleshoot and potentially fix this problem?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Check the PVC:
- Use 'kubectl describe pvc (replace with the name of the PVC used by the 'database-statefulset') to check the PVC details.
- Look for any errors or warnings related to provisioning or access.
- Verify that the PVC's 'Status' field is 'Bound' (indicating the volume is successfully attached to a pod).
2. Investigate the Persistent Volume (PV):
- Use 'kubectl get pv' to list all persistent volumes in the cluster.
- Find the PV that is bound to your PVC (the PV's 'Claim' field should match the name of your PVC).
- Use 'kubectl describe pv to examine the details of the PV. Look for:
- StorageClass: Check if the storage class used by the PV is appropriate for the database workload (e.g., is it provisioned with enough capacity, appropriate 1/0 performance, etc.).
- AccessModes: Ensure the access modes of the PV match the requirements of the database (e.g.,
'ReadWriteOnce' if the database is a single instance).
- Errors: Look for any error messages or warnings related to the PV.
3. Examine Pod Logs:
- Use 'kubectl logs (replace with the name of a crashing database pod) to examine the pod's logs. Look for any error messages related to the volume or database startup.
4. Check for Pod Events:
- Use 'kubectl describe pod to check the events for the pod. Events might provide clues about why the pod is crashing or why the volume is not properly mounted.
5. Possible Solutions:
- Recreate the PVC: If there is an error with the PVC itself, you can try recreating it. Delete the existing PVC, and then create a new one with the same specifications.
- Update StorageClass: If the storage class is not appropriate, consider switching to a different storage class that better meets the database's requirements.
- Increase Storage Capacity: If the database runs out of storage, increase the storage capacity of the PVC.
- Change AccessModes: If the PV access modes are not compatible with the database, update the access modes to match.
- Repair or Replace the PV: If the PV itself has issues, consider repairing the volume (if possible) or replacing it with a new one.
6. Monitor and Iterate:
- After making any changes, monitor the database pods to see if they are now able to start and run without crashing.
- Make sure that the database data is being persisted correctly by checking the volume's contents.

NEW QUESTION # 69
Task Weight: 4%

Task
Schedule a Pod as follows:
* Name: kucc1
* App Containers: 2
* Container Name/Images:
o nginx
o consul

Answer:

Explanation:
Solution:

Graphical user interface, text, application Description automatically generated

Text Description automatically generated

NEW QUESTION # 70
Create an nginx pod and load environment values from the above configmap "keyvalcfgmap" and exec into the pod and verify the environment variables and delete the pod

A. // first run this command to save the pod yaml
kubectl run nginx --image=nginx --restart=Always --dry-run -o
yaml > nginx-pod.yml
// edit the yml to below file and create
vim nginx-pod.yml
apiVersion: v1
name: nginx
envFrom:
- configMapRef:
name: keyvalcfgmap
restartPolicy: Always
kubectl apply -f nginx-pod.yml
// verify
kubectl exec -it nginx -- env
kubectl delete po nginx
B. // first run this command to save the pod yaml
kubectl run nginx --image=nginx --restart=Always --dry-run -o
yaml > nginx-pod.yml
// edit the yml to below file and create
vim nginx-pod.yml
apiVersion: v1
kind: Pod
metadata:
labels:
run: nginx
name: nginx
spec:
containers:
- image: nginx
name: nginx
envFrom:
- configMapRef:
name: keyvalcfgmap
restartPolicy: Always
kubectl apply -f nginx-pod.yml
// verify
kubectl exec -it nginx -- env
kubectl delete po nginx

Answer: B

NEW QUESTION # 71
You have a Deployment for a web application named 'web-app-deployment' that uses an image named 'web-app:vl .0'. You want to implement a rolling update to upgrade the deployment to a new version, 'web-app:v2.0', but only allow a maximum of 2 pods to be unavailable at any time during the update. How would you achieve this using Kubernetes?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML:
- Open the Deployment YAML file for 'web-app-deployment' (e.g., 'web-app-deployment.yaml').
- Modify the 'image' field within the 'spec.template.spec.containers' section to the new image: 'web-app:v2.0'.
- Adjust the 'strategy.rollingUpdate' section to control the rolling update process:
- Set 'maxUnavailable: 2' to allow a maximum of 2 pods to be unavailable at any time.
- Keep 'maxSurge: 0' if you don't want additional pods to be created during the update.

2. Apply the Updated Deployment: - IJse 'kubectl apply -f web-app-deployment.yaml' to apply the updated Deployment YAML. 3. Monitor the Rolling Update: - Use 'kubectl get pods -l app=web-app' to monitor the update process. You will see that Kubernetes will gradually terminate old pods running 'web-app:vl .0' and create new pods with 'web-app:v2.0'. - You can also use "kubectl describe deployment web-app-deployment' to observe the progress of the rolling update. 4. Verify Successful Update: - Once the update is complete, confirm that all pods are running the new image 'web-app:v2.0'. You can check the output of 'kubectl get pods -l app=web-app' or 'kubectl describe deployment web-app-deployment'.

NEW QUESTION # 72
......

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