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| Section | Weight | Objectives |
|---|---|---|
| Application Deployment | 20% | - Implement deployment strategies - Work with Kustomize - Use Helm package manager - Manage Deployments, rolling updates and rollbacks |
| Services and Networking | 20% | - Understand and apply NetworkPolicies - Expose applications via Services - Use Ingress rules - Troubleshoot network access |
| Application Design and Build | 20% | - Understand multi-container Pod design patterns - Define, build and modify container images - Utilize persistent and ephemeral volumes - Choose and use appropriate workload resources |
| Application Observability and Maintenance | 15% | - Work with container logs - Understand API deprecations - Monitor applications using CLI tools - Implement probes and health checks - Debug applications in Kubernetes |
| Application Environment, Configuration and Security | 25% | - Work with ConfigMaps - Apply application security settings - Create and consume Secrets - Configure resource requirements, limits and quotas - Use custom resources and extensions - Use ServiceAccounts - Understand authentication, authorization and admission control |
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NEW QUESTION # 44
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 # 45
Refer to Exhibit.
Task
A Deployment named backend-deployment in namespace staging runs a web application on port 8081.
Answer:
Explanation:
Solution:
NEW QUESTION # 46
You have a container image for your application that includes both the application code and its dependencies. However, you've noticed that the image size is becoming increasingly large. How would you optimize tne container image to reduce its size and improve deployment efficiency?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify and remove unnecessary files: Review the contents ot the image to identify any files that are not required at runtime. This may include development tools, build scripts, documentation, or temporary files. I-Jse a tool like 'docker history' to see the layers of the image and identify unnecessary additions.
2. Optimize build steps: Analyze your Dockerfile and identify any unnecessary commands or layers that contribute to image size. For instance, using multi-stage builds to separate build dependencies from runtime dependencies can significantly reduce image size.
3. Use smaller base images: Choose a leaner base image like 'alpine' or 'scratch' (for minimal environments) instead of a large, bloated base image like 'ubuntu' or 'centos'. Smaller base images offer a significant advantage in terms ot image size-
4. Compress files: Compress static assets, such as configuration files or log files, using tools like 'gzip' or 'bzip2 to reduce their size.
5. Employ a package manager for dependencies: Utilize a package manager like 'apt-gets or 'yum' to install necessary libraries and dependencies. This helps streamline the installation process and optimize package selection.
Example:
Original Dockefflle:
FROM ubuntu:latest
# Install dependencies
RUN apt-get update && \
apt-get install -y python3 python3-pip
# Copy application code and dependencies
COPY - /app
# Run application
CMD ["pytnon3", "/app/app.py"]
Optimized Dockerfile with multi-stage build:
FROM python:3.9-alpine AS builder
# Install dependencies
COPY requirements.txt lapp,/
RUN pip install -r /app/requirements.txt
# Build the application
COPY . /app
RUN python setup.py build
FROM scratch AS runtime
# Copy the compiled application
COPY --from-builder /app/build /app
# Run the application
CMD ["/app/app"]
This optimized Dockerfile uses a smaller base image ('pytnon.3.9-alpineS), leverages multi-stage builds to separate build dependencies from runtime dependencies, and copies only the necessary compiled application to the final image. This results in a significantly smaller container image., You nave a critical batch job tnat processes large amounts of data daily. The job needs to run at a specific time every day, even if the Kubernetes cluster is restarted. Explain how you would design and implement this job using Kubernetes Jobs and CronJobs to ensure reliable execution.
NEW QUESTION # 47
You are building a microservice application that consists of multiple Pods. Each Pod needs to access a shared database hosted in a separate Pod. How would you create a ConfigMap to store the database connection details and make it available to all Pods in the application?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Create a ConfigMap:
- Create a ConfigMap named "database-config' to store the database connection details.
- Replace 'your-database-hostname' , 'your-database-port, 'your-database-user, and 'your-database-password' with the actual connection information.
2. Mount the ConfigMap to Pods: - In tne Deployment configurations for each microservice Pod, mount the 'database-config' ConfigMap as a volume. - Use 'envFror-n' to include the ConfigMap's data as environment variables for the application container - This way, the application can access the database connection details directly through environment variables.
3. Verify the Connection: - Once the Pods are deployed, you can check the application logs to ensure that they are successfully connecting to the database using the provided connection details.
NEW QUESTION # 48
You are building a web application that requires environment-specific configurations, such as database connection details and API keys. You want to use ConfigMaps to manage these configurations in a secure and efficient way You have the following environment variables defined in your deployment YAML:
Create a ConfigMap named 'my-app-config' containing the following data: - 'database host: 'db.example.com' - 'api_key':
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the ConfigMap:
2. Apply the ConfigMap: bash kubectl apply -f my-app-config.yaml 3. Verify the ConfigMap: bash kubectl get configmap my-app-config -o yaml This command will display the created ConfigMap and its contents. 4. Deploy the Deployment: bash kubectl apply -f deploymentyaml The deployment Will now use the values from the ConfigMap to populate the environment variables within the containers. 5. Check the Pods: bash kubectl get pods -l app=my-app -o wide 6. Confirm Environment Variables: bash kubectl exec -it bash -c 'env' Replace with the name of one of the pods. This command will display the environment variables set within the container, including 'DATABASE HOST and 'API KEY'. Note: You should replace with your actual API key in the ConfigMap. This ensures that sensitive information is stored in a separate configuration file and not directly in the deployment YAML file.
NEW QUESTION # 49
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