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Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q63-Q68):

NEW QUESTION # 63
You need to configure a Kubemetes Deployment to use a service account to access resources in a specific namespace. How can you create and assign a service account to your deployment, and how can you configure the service account to access resources in a different namespace?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service Account:
- Create a service account in the namespace where your deployment will run:

- Apply this YAML file using: bash kubectl apply -f service-account-yaml 2 Create a Role and Role8inding: - Define a role in the target namespace that the service account should have access to:

- Create a RoleBinding to bind the role to the service account:

- Apply the Role and Role8inding YAML files using: bash kubectl apply -f role-yaml kubectl apply -f rolebinding.yaml 3. Modify your Deployment: - Update your Deployment YAML file to use the service account:

- Apply the updated deployment 4. Verify Access: - You can now use the service account to access resources in the target namespace. For example, you can create a pod that uses the service account and run a command to access resources.

NEW QUESTION # 64
You are running a critical application in Kubernetes tnat requires nign availability and IOW latency. The application uses a statefulset With 3 replicas, each consuming a large amount of memory. You need to define resource requests and limits for the pods to ensure that the application operates smoothly and doesn't get evicted due to resource constraints.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Determine Resource Requirements:
- Analyze tne application's memory usage. Determine tne average memory consumption per pod and the peak memory usage.
- Consider the resources available on your Kubernetes nodes.
- Define realistic requests and limits based on the application's needs and available node resources.
2. Define Resource Requests and Limits in the StatefuISet:
- Update the StatefuISet YAML configuration with resource requests and limits for the container.
- requests: Specifies the minimum amount of resources the pod will request
- limits: Specifies the maximum amount of resources the pod can use.

3. Apply the StatefulSet Configuration: - Apply the updated StatefulSet configuration to your Kubernetes cluster: bash kubectl apply -f my-critical-app-statefulset.yaml 4. Monitor Resource Usage: - Use 'kubectl describe pod' to monitor the resource usage of the pods. - Ensure that the pods are utilizing the requested resources and not exceeding the limits.

NEW QUESTION # 65
You have a Kubernetes cluster With several deployments using secrets for sensitive information. You need to implement a mechanism to ensure that these secrets are rotated regularly to enhance security. Explain how you can achieve this using Kubernetes native features, and provide a detailed example demonstrating the process of secret rotation for a deployment called "myapp" which utilizes a secret named "myapp-secret".

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Secret Rotation Job:
- Define a CronJob:
- This job will be scheduled to run periodically to trigger the secret rotation process.
- In the CronJob definition, specify the desired schedule (e.g., daily, weekly, monthly) using a cron expression.

2. Update Deployment to Use New Secret: - Modify the Deployment Configuration: - Update the Deployment YAML tile of "myapp" to utilize the newly generated secret. - Replace the old secret name with the new secret name.

3. Apply the Changes: - Run the Update Commands: - Apply the CronJ0b definition using kubectl apply -f myapp-secret-rotator.yamr - Apply the updated Deployment configuration using 'kubectl apply -f myapp-deployment.yamr. 4. Verification: - Monitor tne CronJob and Deployment: - Use ' kubectl get cronjobs myapp-secret-rotator' to confirm the CronJob is running and triggering the rotation. - Monitor the 'myapp' Deployment to ensure the pods are utilizing the newly generated secret using 'kubectl get pods -l app=myapp' - Observe the output of the Deployment to verifry the rotation is successful. Key Points: - Secret Rotation Logic: The CronJob runs a script that deletes the old secret ( ' myapp-secret) and creates a new secret with updated credentials. - Deployment Update: The Deployment is updated to use tne new secret, ensuring tne application uses the latest credentials. - Automated Process: This approach automates the secret rotation process, eliminating manual intervention and enhancing security. This example demonstrates how to implement automated secret rotation for deployments using Kubernetes. You can modify the script in the CronJob and the deployment configuration to suit your specific environment and credential management needs. ,

NEW QUESTION # 66
You are building a microservice application that involves multiple pods. You want to ensure that the database pod is always started before other pods, and the database is initialized before tne application pods can access it. Explain how you can achieve this using Kubernetes and init containers.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create an Init Container:
- Define an init container within the database pod'S spec.
- This container will run before the main database container.
- Provide the necessary scripts or commands for database initialization within this container
- Example:

2. Ensure Dependencies: - Define dependencies for the application pods. - Use 'dependson' in the application pod spec to ensure that the database pod (and its init container) is running before the application pod starts. - Example:

3. Deploy and Test: - Apply the YAML files to create the pods. - Verify that the init container runs successfully and completes its initialization task. - Check the logs to ensure that the database is ready before the application pod starts. - Test the application to confirm that it can connect to the database and function correctly.

NEW QUESTION # 67
You have a container image that uses a specific version of a library. You want to update this library to a newer version while still keeping the previous version available for compatibility purposes. Describe the steps involved in modifying the container image to include both versions of the library without rebuilding the entire application.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Dockerfile:
- Create a new 'Dockerfile' with the following content:

- Replace 'your-library' Witn the actual library name. - Replace 'new-version' and 'old-version' witn tne desired versions. 2. Build the Image: - Build the image using tne DockerTlle: docker build -t updated-image:latest 3. Modify your application code: - Modify your application code to explicitly import the specific version of the library that you want to use. For example: python # Import the new version for new functionality from your_library impon new_functionality # Import the Old version for backward compatibility from your_library import old_functionality # Use the appropriate version of the library based on your requirements 4. IJpdate the Deployment - Modify your Deployment YAML file to use the newly built image:

5. Apply the Changes: - Apply the updated Deployment using kubectl apply -f deployment.yamr 6. Test the Application: - Access your application and ensure it functions correctly with both versions of the library.

NEW QUESTION # 68
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