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| Section | Weight | Objectives |
|---|---|---|
| Application Deployment | 20% | - Manage Deployments, rolling updates and rollbacks - Use Helm package manager - Implement deployment strategies - Work with Kustomize |
| Application Design and Build | 20% | - Understand multi-container Pod design patterns - Define, build and modify container images - Choose and use appropriate workload resources - Utilize persistent and ephemeral volumes |
| Application Observability and Maintenance | 15% | - Work with container logs - Understand API deprecations - Implement probes and health checks - Debug applications in Kubernetes - Monitor applications using CLI tools |
| Application Environment, Configuration and Security | 25% | - Apply application security settings - Work with ConfigMaps - Configure resource requirements, limits and quotas - Use ServiceAccounts - Create and consume Secrets - Use custom resources and extensions - Understand authentication, authorization and admission control |
| Services and Networking | 20% | - Understand and apply NetworkPolicies - Use Ingress rules - Expose applications via Services - Troubleshoot network access |
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NEW QUESTION # 235
You are tasked with setting up a secure Kubernetes cluster for a web application. The application has sensitive data that must be protected. You need to configure a mecnanism to restrict access to the application's pods based on user identities. Describe a method to achieve this using Kubernetes RBAC and Service Accounts, ensuring that only authorized users can access specific pods.
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 for the application:
- Apply the Service Account configuratiom basn kubectl apply -f webapp-sa.yaml 2. Create a Role: - Define a Role that grants access to the specific pods:
- Apply the Role configuratiom bash kubectl apply -f webapp-pod-reader.yaml 3. Create a RoleBinding: - Bind the Role to the Service Account
- Apply the RoleBinding configuration: bash kubectl apply -f webapp-pod-reader-binding_yaml 4. Configure the Application: - When deploying the application, specify the Service Account:
5. Verify Access: - Use the 'kubectr command with the Service Account's credentials to verify that only authorized users can access the application's pods: bash kubectl -service-account=webapp-sa get pods -n This setup utilizes Kubernetes RBAC to control access to the application's pods. - The Service Account acts as an identity for the application. - The Role defines the permissions granted to the Service Account, specifically allowing access to the pods. - The RoleBinding associates the Role with the Service Account, linking the permissions to the identity. - When the application is deployed witn tne specified Service Account, it inherits the permissions defined in the RoleBinding. This ensures that only users with the necessary credentials (associated with the Service Account) can access and interact with the application's pods, safeguarding sensitive data.
NEW QUESTION # 236
You are deploying a web application with a separate database container. You need to implement a proxy container that handles requests from the web server and forwards them to the database container. The proxy container should also log all incoming requests to a dedicated log file within the Pod.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Pod YAML: Create a Pod YAML file that includes the web server, database, and proxy containers.
2. Configure the Proxy Container: Choose a suitable proxy container image (e.g., Nginx, HAProxy) and configure it to forward requests from port 8080 to the database container on port 5432 3. Implement Logging: Configure the proxy container to log incoming requests to the '/var/log/proxy' directory. You can use the proxy container's built- in logging facilities or install a separate logging agent within the container. 4. Deploy the Pod: Apply the Pod YAML using ' kubectl apply -f my-app-pod_yaml' 5. Verify Functionality: Access the web server container on port 80 and ensure requests are forwarded to the database container Check the log file ' Ivar/log/proxys to verify that requests are being logged. Note: This solution demonstrates using a proxy container to manage communication between different containers within a Pod. You can customize the proxy's configuration based on your specific application's requirements.,
NEW QUESTION # 237
You're managing a Kubernetes cluster with various applications. You want to implement a mechanism that automatically scales deployments based on CPU utilization. The scaling should be triggered when CPU utilization exceeds 70% and should scale down to 50% utilization.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Horizontal Pod Autoscaler (HPA) YAMLI
- Create an HPA YAML file named 'auto-scaler.yaml' with the following contents:
2. Apply the HPA: - Apply the HPA YAML file using 'kubectl apply -f auto-scaler.yamr. 3. Test the Auto-scaler - Monitor the CPU utilization of your deployment. When it exceeds 70%, the HPA will automatically scale up the deployment. - Observe the deployment scaling down when CPIJ utilization drops below 50%.
NEW QUESTION # 238
You are deploying a microservice application that requires secure access to an external database. The database credentials are stored as environment variables Within the application container. You want to create a Kubernetes secret that securely stores these credentials and can be mounted as a file in the container.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Kubernetes Secret:
- Create a YAML file, for example, 'database-secret.yamr , with the following content:
- Replace ". ". ". and with the actual values, Base64 encoded. You can use the 'base64' command to encode the values: bash echo "your _ username" | base64 echo 'Your_password" | base64 echo "your _ host" | base64 echo "your _ port" | base64 2. Apply the Secret: - Apply the secret to your Kubernetes cluster: bash kubectl apply -f database-secret.yaml 3. Modify the Deployment: - Modify your Deployment YAML file to mount the secret as a file:
4. Apply the Updated Deployment: - Apply the updated Deployment YAML file using: bash kubectl apply -f my-microservice-deployment.yaml 5. Accessing Credentials: - The application container can now access the environment variables from the secret using 'process-env-DATABASE USER , 'process.env.DATABASE_PASSWORD', etc. Additionally, the secret data is mounted as a file at '/var/secrets/database'.
NEW QUESTION # 239
You are developing a microservices application and want to deploy it to Kubernetes using Helm. You have two services: 'user-service and 'order-service. The 'order-service depends on the "user-service'. How would you use Helm to manage these deployments, ensuring that the 'order- service' only starts after the 'user-service' is successfully deployed and running?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Helm Chart for Each Service:
- 'user-service' chart:
- Create a 'values.yamr file for the 'user-service' chart.
- Define the container image, resources, and any other necessary configurations for the 'user-service'.
- 'order-service' chart:
- Create a 'values-yamr file for the 'order-service' chart
- Define the container image, resources, and any other necessary configurations for the 'order-service'
- In tne 'values.yamr, add a dependency on the 'user-service' chart.
2. Configure Helm for Dependency Management: - Use the '-dependency-update' flag to ensure that Helm automatically updates the 'user-service chart before deploying the 'order-service' bash helm dependency update order-service 3. Deploy the Services Using Helm: - Deploy the 'user-service chart: bash helm install user-service Juser-service - Deploy the 'order-service' chart: bash helm install order-service ./order-service - Helm will automatically handle the dependency between the services, ensuring that the 'user-services is deployed before the 'order-service' 4. Verify Deployment and Dependency: - Use ' kubectl get pods -l app=user-service' and 'kubectl get pods -l app=order-service' to verify that the pods are running. - You Should observe that the 'user-service' pods are up and running before the 'order-services pods start. - You can also use 'kubectl describe pod' to see the pod events and confirm that the 'order-service' pod is waiting for the 'user-service' to be ready before starting.,
NEW QUESTION # 240
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