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The CKAD exam is designed for developers who are already proficient in Kubernetes application development and want to validate their skills. CKAD exam tests candidates on a variety of topics including core concepts, configuration, multi-container pods, observability, pod design, services and networking, state persistence, and troubleshooting. CKAD exam is based on the Kubernetes v1.19 curriculum, which is the latest version of Kubernetes at the time of writing.

The CKAD Certification Exam is designed to help developers demonstrate their proficiency in Kubernetes application development and deployment. CKAD exam covers a wide range of topics, including Kubernetes architecture, core concepts, networking, storage, security, troubleshooting, and more. CKAD exam consists of a set of performance-based tasks that require candidates to demonstrate their ability to perform real-world Kubernetes tasks using the command line.

Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q68-Q73):

NEW QUESTION # 68
Context

A web application requires a specific version of redis to be used as a cache.
Task
Create a pod with the following characteristics, and leave it running when complete:
* The pod must run in the web namespace.
The namespace has already been created
* The name of the pod should be cache
* Use the Ifccncf/redis image with the 3.2 tag
* Expose port 6379

Answer:

Explanation:
Solution:

NEW QUESTION # 69
Context

Context
You sometimes need to observe a pod's logs, and write those logs to a file for further analysis.
Task
Please complete the following;
* Deploy the counter pod to the cluster using the provided YAMLspec file at /opt/KDOB00201/counter.yaml
* Retrieve all currently available application logs from the running pod and store them in the file /opt/KDOB0020l/log_Output.txt, which has already been created

Answer:

Explanation:
Solution:

NEW QUESTION # 70
You have a Deployment named 'web-app' running a containerized application with a complex startup sequence. The application relies on a database service that might be Slow to respond on startup. How would you implement Liveness and Readiness probes to ensure the application iS healthy and available to users, even during startup?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define Liveness Probe:
- Create a 'livenessProbe' within the 'containers' section of your 'web-app' Deployment YAML-
- Choose a probe type appropriate tor your application. In this case, since the startup is complex, use an 'exec' probe.
- Specify the command to execute. This should be a simple command that checks if the application is up and ready to handle requests.
- Set 'initialDelaySecondS and 'periodSeconds' to provide sufficient time for the application to start.
- Configure 'failureThreshold' and 'successThreshold' to define how many tailed or successful probes trigger a pod restart.

2. Define Readiness Probe: - Create a 'readinessProbe' Within the 'containers' section of your 'web-apps Deployment YAML. - Use the same 'exec' probe type as for the liveness probe. - Specify a command that checks it the application is ready to serve traffic. - Set 'initialDelaySeconds' and 'periodSeconds' to control the frequency and delay of the probe. - Configure 'failureThreshold' and 'successThreshold' to handle failed or successful probe results.

3. Deploy the Deployment: - Apply the updated YAML file using 'kubectl apply -f web-app.yamr 4. Verify the Probes: - Observe the pod logs using 'kubectl logs to see when liveness and readiness probes are executed. - Use 'kubectl get pods -I app=web-app' to check the status of pods and see how liveness and readiness probes affect the pod's health and availability. 5. Test the Application: - Send requests to the application to verify that it is healthy and responsive, even during startup. - Liveness Probe: The ' livenessProbe' checks if the application is still healthy and running. If the probe fails repeatedly, the Kubernetes will restart the pod to fix the issue. This ensures that unhealthy pods are removed and replaced with healthy ones. - Readiness Probe: The 'readinessproa' cnecks it the application iS ready to receive traffic. This allows Kubernetes to delay sending traffic to a pod until it is fully initialized and prepared to serve requests. It helps prevent users from encountering errors during startup. By using both liveness and readiness probes, you can ensure your application is healthy and available to users, even during complex startup sequences.,

NEW QUESTION # 71
You're building a Kubernetes application that manages user profiles and requires a custom resource for storing profile information. Design a custom resource definition (CRD) and its corresponding controller, ensuring that every time a profile is created or updated, a unique user ID is assigned to the profile.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the Custom Resource Definition (CRD)I
- Define the CRD Spec:

- Apply the CRD: bash kubectl apply -f profile-crd_yaml 2. Create a Controller for the Custom Resource: - Define the Controller Logic:

- Check the 'userld' field in the output You should see the automatically generated unique user ID. This comprehensive solution demonstrates how to implement a custom resource definition and a controller for managing user profiles in Kubernetes. You can adjust the code and logic according to your specific requirements. ,

NEW QUESTION # 72
You have a Deployment named 'frontend-deployment that runs a frontend application. This deployment is configured to use a ' StatefulSet for its backend service. However, during a recent update, the update process for the 'StatefulSet failed. You need to understand how this failure mignt have impacted the deployment and the frontend application. Explain tne possible causes of this failure and how it might have affected the frontend service.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
The failure of a StatefulSet update can have significant repercussions for the 'frontend-deployment and its frontend application. Let's analyze the possible causes and their impact
1. Persistent Volume Provisioning Issues:
- StatetulSets rely on persistent volumes to maintain data and state across pod restarts.
- If the persistent volume provisioning fails, the pods in the StatefulSet might be unable to access their persistent volumes, causing application errors.
2. StatefulSet Pod Update Errors:
- If the update process for the StatefulSet pods encounters errors during the update, like image pull failures or container startup issues, the update might fail, leading to partially updated pods or even the removal of existing pods.
3. StatefulSet Pod Termination Issues:
- StatetulSets use a strict update strategy where pods are terminated in sequence based on their ordinal numbers.
- If the termination of a specific pod fails, tne update process will be interrupted, leaving the StatefulSet in a partially updated state. Impact on the Frontend Application:
- Data Loss: If the StatefulSet's persistent volume provisioning fails, the backend service might lose data, leading to data inconsistencies and potential loss for the frontend application.
- Service Interruptions: The frontend application might experience service interruptions due to the backend service becoming unavailable or partially functional during the StatefulSet update failure-
- Functionality Degradation: If the StatefulSet update process results in partially updated pods, the frontend application might encounter degraded functionality or erratic benavior Troubleshooting:
- Examine the ' StatefulSet' and its pod logs for error messages.
- Check the persistent volume provisioning status and ensure the volumes are correctly mounted to the pods.
- Analyze the pod events for any failures during the update process.

NEW QUESTION # 73
......

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