QUIZ 2025 HIGH-QUALITY LINUX FOUNDATION CKAD: LINUX FOUNDATION CERTIFIED KUBERNETES APPLICATION DEVELOPER EXAM LATEST TEST DISCOUNT

Quiz 2025 High-quality Linux Foundation CKAD: Linux Foundation Certified Kubernetes Application Developer Exam Latest Test Discount

Quiz 2025 High-quality Linux Foundation CKAD: Linux Foundation Certified Kubernetes Application Developer Exam Latest Test Discount

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Linux Foundation Certified Kubernetes Application Developer Exam Sample Questions (Q73-Q78):

NEW QUESTION # 73
You have a Deployment running a web application built With a Node.js container. The application currently uses an older version of the Node.js runtime, and you need to upgrade to a newer versiom Describe the steps involved in modifying the container image to include the new Node.js runtime 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 With the name of the existing Docker image used by your Deployment. - This Dockefflle uses a multi-stage build approach. It starts with a new Node.js base image and copies the application code from the existing image. This allows you to update the runtime without rebuilding the entire application. 2. Build the New Image: - Build tne image using the Dockerflle: docker build -t updated-image:latest 3. Update the Deployment - Modify your Deployment YAML file to use the newly built image:

4. Apply the Changes: - Apply the updated Deployment using 'kubectl apply -f deployment.yamr. This will trigger a rolling update to the pods using the new image. 5. Verify the Update: - Check the logs of the pods using 'kubectl logs -f ' . You should see the application running with the updated Node.js version. 6. Test the Application: - Access your application and ensure it functions correctly with the new Node.js runtime.


NEW QUESTION # 74
Refer to Exhibit.

Task:
Create a Pod named nginx resources in the existing pod resources namespace.
Specify a single container using nginx:stable image.
Specify a resource request of 300m cpus and 1G1 of memory for the Pod's container.

Answer:

Explanation:
Solution:




NEW QUESTION # 75
You are running a critical application in your Kubernetes cluster, and it requires access to sensitive information stored in a secret To ensure the application only accesses the specific data it needs and avoids potential misuse, you need to configure ServiceAccounts With proper permissions to access the secret. Describe the steps involved in creating a ServiceAccount with the least privilege principle to access the secret Additionally, mention the YAML configuration required for the ServiceAccount and Role.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Secret:
- Create a secret to store your sensitive data using 'kubectl create secret generic my-secret -from
- This command creates a secret named 'my-secret' with two key-value pairs: 'username' and 'password'
- Replace the values with your actual sensitive data.
2. Create a ServiceAccount
- Create a ServiceAccount using 'kubectl create serviceaccount my-service-account
- This command creates a ServiceAccount named 'my-service-account'
3. Create a Role:
- Create a Role to define the permissions for the ServiceAccount. This role will grant access to the secret.
- Create a Role named 'my-role' using the following YAML:

- Save this configuration in a file named 'my-role.yamr and apply it to your cluster using 'kubectl apply -f my-role-yamp - Replace 'default' With the namespace where your secret is created. 4. Bind the Role to the ServiceAccount: - Bind the created Role to the ServiceAccount using 'kubectl create rolebinding my-role-binding -role-my-role account'. - This command creates a RoleBinding named 'my-role-binding' which binds the 'my-role' to the 'my-service-account' in the 'default' namespace. - Replace 'default' With the namespace where your secret is created. 5. Verify Permissions: - You can verify the ServiceAccount's access to the secret using 'kubectl auth can-i get secrets -as-my-service-account --namespace=default' - This command should return 'yes' if the ServiceAccount has the necessary permissions. 6. Use the ServiceAccount in your Pod: - Use the ServiceAccount within your Pod's specification to grant the application access to the secret. - Add a 'serviceAccountNames field Within your Pod specification pointing to tne created ServiceAccount.

Now your application running in the Pod will have access to the secret 'my-secret using the environment variables defined in the 'envFror-n' section. The ServiceAccount 'my-service-account is configured with the least privilege principle, ensuring that it can only access the necessary data. ,


NEW QUESTION # 76
You have a Deployment named 'my-app-deployment' that runs 3 replicas of a Spring Boot application. This application needs to access a PostgreSQL database hosted on your Kubernetes cluster. You need to create a Custom Resource Definition (CRD) to define a new resource called 'Database' to represent the PostgreSQL database instances within your cluster. This CRD should include fields for specifying the database name, username, password, and the host where the database is deployed. Further, you need to configure the 'my- app-deployment' to use the 'Database' resource to connect to the PostgreSQL instance dynamically.

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the CRD:
- Create a YAML file named 'database.crd.yaml' to define the "Database' resource:

2. the CRD: - Apply tre 'database.cre.yaml' using 'kubectl "ply -f database.crd.ya'mr 3. Create A Database Instance: - 'eate YAML file 'd:tabaseyarnl' to define a database instance

4. Apply the Database Instance: - Apply the 'database.yaml' using 'kubectl apply -f database.yamr 5. IJpdate the Deployment - Update the Amy-app-deployment.yaml' to use the 'Database' resource:

6. Apply the Updated Deployment: - Apply the updated 'my-app-deployment.yamr using 'kubectl apply -f my-app-deployment.yamr 7. Verify the Configuration: - Use 'kubectl get databases to check the database instance. - Use 'kubectl describe pod -l app=my-app' to verify that the pods are using the values from the 'Database' resource tor connecting to the PostgreSQL database. This approach demonstrates how to utilize CRDs to define custom resources in Kubernetes and how to connect applications dynamically to these resources. The CRO ensures proper definition of the database resource, while the deployment utilizes the 'fieldRef mechanism to access and retrieve database connection details directly from the CRD, enabling dynamic configuration and simplification of application setup.,


NEW QUESTION # 77
You are building a Kubernetes application that requires access to sensitive credentials stored in a Secret. The application should only have access to specific keys within the Secret, and you need to ensure that the Secret is updated without disrupting the application's functionality. How would you design and implement this functionality using Custom Resource Definitions (CRDs) and Kubernetes resources?

Answer:

Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define a CRD for Secret Access:
- Create a Custom Resource Definition (CRD) named 'SecretAccess' , representing the required access to the Secret. This CRD will define the following fields:
- 'secretName': The name ot the Secret containing the sensitive information.
- 'allowedKeys': A list of keys from the Secret that the application is allowed to access.
- The 'SecretAccess' CRD schema will be validated to ensure that the specified Secret and keys exist.

2. Create a Controller for SecretAccess CRD. - Implement a Kubernetes controller that watches for changes in 'SecretAccesS resources. - When a new 'SecretAccesS resource is created or updated, the controller: - Validates the specified Secret and allowed keys. - Creates or updates a new 'Secret resource with the requested keys from the original Secret. - Updates the 'SecretAccess' resource status with the name of the generated Secret.

3. Create a SecretAccess Resource: - Define a 'SecretAccess' resource specifying the target Secret and allowed keys.

4. Update the Application to IJse the Generated Secret: - Modify your application to use the generated Secret, whiCh will contain only the allowed keys. - The generated Secret name can be retrieved from the "SecretAccess' resource status. - The application can access the Secret using the Kubernetes API, similar to accessing a regular Secret.

- The SecretAccesS CRD acts as a resource request for access to specific keys from a Secret_ - The controller ensures that only the requested keys are made available to the application, enhancing security. - By generating a separate Secret for each application with limited access, you prevent accidental exposure ot sensitive data. - The automated update mechanism of the controller allows you to update the original Secret without disrupting the application.,


NEW QUESTION # 78
......

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