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| Section | Weight | Objectives |
|---|---|---|
| Application Observability and Maintenance | 15% | - Understand API deprecations - Implement probes and health checks - Work with container logs - Debug applications in Kubernetes - Monitor applications using CLI tools |
| Application Environment, Configuration and Security | 25% | - Use ServiceAccounts - Create and consume Secrets - Work with ConfigMaps - Configure resource requirements, limits and quotas - Apply application security settings - Understand authentication, authorization and admission control - Use custom resources and extensions |
| Application Deployment | 20% | - Manage Deployments, rolling updates and rollbacks - Implement deployment strategies - Use Helm package manager - Work with Kustomize |
| Services and Networking | 20% | - Troubleshoot network access - Expose applications via Services - Use Ingress rules - Understand and apply NetworkPolicies |
| Application Design and Build | 20% | - Utilize persistent and ephemeral volumes - Choose and use appropriate workload resources - Understand multi-container Pod design patterns - Define, build and modify container images |
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NEW QUESTION # 148
You are deploying a web application that uses a separate database pod. The database pod is managed by a StatefulSet, and the web application pods need to access the database using tne database pod'S nostname. Explain how you can configure the web application pods to access the database pod using the hostname provided by the StatefulSet.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Configure the StatefulSet:
- Define the database pod within a StatefulSet.
- Ensure that the StatefulSet assigns a unique hostname to each pod, making it accessible by name-
- Example:
2. Configure the Deployment: - Denne the web application pod Within a Deployment. - Use the 'hostAliaseS field in the Deployment's 'spec.template.spec.containers' to map the database pod's hostname to its IP address. - Example:
3. Access Database by Hostname: - Within tne web application's code, you can now access the database using the hostname "database-service" without needing to know the database pod's actual IP address. - Kubernetes will automatically resolve the hostname to the correct IP address based on the hostAliases configuration. 4. Deploy and Test: - Deploy the StatefulSet and Deployment. - Test the web application to ensure that it can connect to the database using the provided hostname. 5. Important - The ' hostAliases' approach is typically used for cases where the database pod's hostname is consistent and predictable. - It might not be suitable for scenarios involving dynamic pod scaling or where the database pod's hostname changes frequently. - In those scenarios, consider using a Service and Service discovery mechanism to connect to the database.
NEW QUESTION # 149
You are building a container image for a Spring Boot application that connects to a MySQL database. The application requires specific environment variables, such as the database nostname, username, password, and port. How would you define these environment variables Within the Docker-file to ensure the application runs correctly in a Kubernetes cluster?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
1. Define Environment Variables in Docker-file:
- Utilize the 'ENV' instruction within your Dockerfile to set the necessary environment variables.
- These variables will be accessible to your Spring Boot application during runtime.
- Example:
dockerfile
2. Build the Docker Image: - Construct your Docker image using the Docker-file. - Run the following command: 'docker build -t your-image-name 3. Deploy to Kubernetes: - Create a Deployment or Pod in Kubernetes that utilizes your built image. - Ensure the pod's environment variables align with the ones defined in your Dockerfile. - Example (Deployment YAML):
4. Verify Application Functionality: - Access your deployed application in the Kubernetes cluster. - Verify that it connects successfully to the database and operates as expected.
NEW QUESTION # 150 
Task:
1) Fix any API depreciation issues in the manifest file -/credible-mite/www.yaml so that this application can be deployed on cluster K8s.
2) Deploy the application specified in the updated manifest file -/credible-mite/www.yaml in namespace cobra See the solution below.
Answer:
Explanation:
Solution:
NEW QUESTION # 151
You need to schedule a job to run every day at 10:00 AM to clean up old container images in your Kubernetes cluster These images are tagged with "app=my-app" and have been created in the last 7 days. How would you implement this using a CronJob?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a CronJob YAML file:
2. Apply the Cronjob: bash kubectl apply -f image-cleanup-cronjob.yaml 3. Verify the CronJob: bash kubectl get cronjobs - Schedule: The 'schedule' field defines the cron expression, which triggers the job every day at 10:00 AM. - Job Template: - The 'j0bTemplate' defines the actual job that Will be executed. - Container: - The 'image' field specifies the container image to use. In this case, it's a container with 'kubectr pre-installed_ - The 'command' and Sargs' fields detine the command to run in the container. The command uses 'kubectr to list images With the specified label and then iterates through them, checking their creation date. If an image is older than 7 days, it's deleted. - RestaftPolicy: The 'restartPolicy' is set to 'OnFailure' to ensure the job restarts if it fails. Important Note: - Make sure the container image you choose has the necessary tools (like 'kubectl') to interact with your Kubernetes cluster. - This solution assumes you have the necessary permissions to delete images. If not, you may need to modify the 'kubectl delete image' command to use appropriate RBAC roles. - This solution doesn't consider images used by running pods. You should adjust the script to exclude images that are currently in use. This Cronjob will automatically run every day, cleaning up old container images and maintaining a clean environment in your cluster.,
NEW QUESTION # 152
You need to configure a Kubernetes deployment to use a secret stored in a different namespace. How can you access the secret in a different namespace, and how can you mount it as a file in your deployment's container?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Ensure Access to the Secret:
- The service account used by your deployment needs to have read access to the secret in the other namespace. This can be done using a Role and RoleBinding. If the service account already has access, skip to step 2.
- Create a role in the secret's namespace:
- Create a RoleBinding in the secret's namespace:
- Apply the Role and RoleBinding using: bash kubectl apply -f role-yaml kubectl apply -f rolebinding.yaml 2. Modify your Deployment - Update your Deployment YAML file to mount the secret as a file, specifying the namespace:
- Replace 'my-secret with the actual name of the secret and 'secret-namespace with the namespace where the secret is stored. 3. Apply the Updated Deployment: - Apply the updated deployment using: bash kubectl apply -f my-deployment.yaml 4. Access Secret Data: - The secret's data is now mounted in the container at the specified 'mountPatm. You can access the secret's data using the mounted file.]
NEW QUESTION # 153
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