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| Certification Vendor: | Linux Foundation |
|---|---|
| Exam Name: | Certified Kubernetes Application Developer (CKAD) Exam |
| Exam Number: | CKAD |
| Exam Price: | USD 445 |
| Available Languages: | English |
| Exam Format: | Command-line, Performance-based |
| Certificate Validity Period: | 3 years |
| Related Certifications: | Certified Kubernetes Application Developer (CKAD) |
| Exam Duration: | 120 minutes |
| Real Exam Qty: | 15-20 (performance-based tasks) |
| Passing Score: | 66% |
| Sample Questions: | Linux Foundation CKAD Sample Questions |
| Exam Way: | Online, proctored exam via PSI Secure Browser (performance-based in a command-line environment). |
| Pre Condition: | No mandatory prerequisites, but working knowledge of container runtimes and microservice architecture is recommended. |
| Official Syllabus URL: | https://training.linuxfoundation.org/certification/certified-kubernetes-application-developer-ckad/ |
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Linux Foundation Certified Kubernetes Application Developer (CKAD) certification is a professional certification that validates the skills and knowledge of a developer in designing, building, configuring, and deploying applications using Kubernetes. Kubernetes is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. The CKAD Certification is designed for developers who are proficient in Kubernetes and have experience in developing, deploying, and managing containerized applications.
NEW QUESTION # 211
You are building a microservices application on Kubernetes, where two services, and 'service-b' , need to communicate with each other securely. 'Service-b' needs to expose a secure endpoint that is only accessible by 'service-a'. Describe how you would implement this using Kubernetes resources, including the configuration for the 'service-b' endpoint.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define a Kubernetes Secret:
- Create a Kubernetes secret to store the certificate and key pair for 'service-W. This secret will be used to secure the communication.
- Example:
2. Configure 'service-b' Deployment: - Define a Deployment for 'service-b' , specifying a container that uses the secret for TLS. - Ensure that the container has the required dependencies and configuration to use TLS. - Example:
3. Define a Kubernetes Service for 'service-b'.' - Create a Service for 'service-b' that exposes the secure endpoint on a specific port (e.g., 8443) and uses the LoadBalancer' type for external access. - Use the 'targetPort' field to specify the container port that 'service-b' is listening on. - Example:
4. Configure 'service-a' Deployment: - Define a Deployment for 'service-a', specifying a container that uses the secret for TLS when connecting to service-W. - Example:
5. Update 'service-a' Container Configuration: - Within the 'service-a' container, ensure the application is configured to use the certificate and key from the mounted volume ('Ivar/tls/') for secure communication with 'service-b'. 6. Verify Secure Communication: - Use 'kubectl get pods' to check the status of both 'service-a' and 'service-W pods. - Test the communication between 'service-a' and 'service-b' by sending requests from the 'service-a' pod to the secure endpoint of 'service-b'. - Verify that the communication is secure and that 'service-a' can successfully access the endpoint. Notes: - You may need to adjust the port numbers and image names in the examples to match your specific setup. - Make sure you have the certificate and key in the correct format and base64 encoded before creating the Secret. - You can also use other methods like a Service Account and Role-Based Access Control (RBAC) to restrict access to the secure endpoint, if needed. - This is a simplified example and additional security measures may be required based on your application's requirements. ,
NEW QUESTION # 212 
Task:
1) Create a secret named app-secret in the default namespace containing the following single key-value pair:
Key3: value1
2) Create a Pod named ngnix secret in the default namespace.Specify a single container using the nginx:stable image.
Add an environment variable named BEST_VARIABLE consuming the value of the secret key3.
Answer:
Explanation:
See the solution below.
Explanation
Solution:
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Text Description automatically generated
NEW QUESTION # 213
You have a microservice application that consists of two components: a web server (using Nginx) and a database (using PostgreSQL). The web server needs to access the database through a local connection, but due to network security restrictions, the web server cannot connect to the database directly. Describe how you can utilize a sidecar container to resolve this issue and ensure the database connection is secure.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Sidecar Container:
- Define a new container in your Deployment's 'spec-template-spec-containers' array, alongside the existing Nginx container. This new container will house the necessary tools for facilitating a secure database connection.
- Name this container appropriately, for example, 'database-proxy'
- Choose an image that contains the required software for database connection, such as 'postgres' or 'postgresqr
- Use a sidecar pattern in the Deployment YAML file. You can specify the sidecar in the container array in the Pod specification:
2. Database Connection Configuration: - Configure the sidecar container to connect to the database. - Establish a connection using the database user credentials and connection string. - If you use a secure connection, ensure that the certificates and private keys are accessible to the sidecar container. 3. Communication Between Containers: - Configure your web server container to communicate with the sidecar container. - Use environment variables to specify the hostname and port of the sidecar container, enabling the web server to connect to the database proxy within the pod. 4. Volume Sharing: - Optionally, share a volume between the web server and the sidecar container to facilitate shared data access, such as database configuration files. 5. Deploy the Deployment: - Apply the updated Deployment YAML file to your Kubernetes cluster using 'kubectl apply -f my-app.yaml' 6. Test the Application: - Access your web server application and confirm that it successfully connects to the database through the sidecar container.
NEW QUESTION # 214 
Task
A Deployment named backend-deployment in namespace staging runs a web application on port 8081.
Answer:
Explanation:
See the solution below.
Explanation:
Solution:
NEW QUESTION # 215
You have a Deployment named 'wordpress-deployment' that runs 3 replicas of a WordPress container. The container image is pulled from a private registry with authentication credentials stored in a secret called 'registry-credentials' _ Implement a strategy to ensure that only one replica of the Deployment is updated at a time, and the update process is triggered automatically whenever a new image is pushed to the private registry with the tag 'wordpress:latest'
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Secret for Registry Credentials:
- Replace with the base64 encoded content of your dockerconfigjson file containing the registry credentials. 2 Update the Deployment YAML:
- Replace 'your-registry-com' with your private registry address. - Ensure the 'imagePullSecrets' section references tne 'registry-credentials' secret. - Configure the 'strategy-type' to 'Rollingupdate', and 'strategy-rollingl-lpdate.maxunavailable' to ' 1 ' to allow only one replica to be unavailable during the update. - Set 'imagePullPolicy' to 'Always' to ensure the new image is pulled every time. 3. Apply the Updated YAML: bash kubectl apply -f wordpress-deploymentyaml 4. Verify the Deployment bash kubectl get deployments wordpress-deployment 5. Trigger the Automatic Update: - Push a new image with the tag 'wordpress:latest' to your private registry. 6. Monitor the Deployment - Use 'kubectl get pods -l app=wordpress' to monitor the pod updates during the rolling update process. 7. Check for Successful Update: - After the update is complete, run 'kubectl describe deployment wordpress-deployment' to verify that the 'updatedReplicaS matcnes the 'replicas' field. Now, whenever a new image tagged 'wordpress:latest' is pushed to your private registry, Kubernetes will automatically trigger a rolling update for the 'wordpress-deployment , updating one replica at a time while ensuring availability.,
NEW QUESTION # 216
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