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| Section | Weight | Objectives |
|---|---|---|
| Application Deployment | 20% | - Understand Deployments and how to perform rolling updates - Use the Helm package manager to deploy existing packages - Use Kubernetes primitives to implement common deployment strategies (e.g., blue/green or canary) - Kustomize |
| Application Environment, Configuration and Security | 25% | - Understanding and defining resource requirements, limits and quotas - Understand authentication, authorization and admission control - SecurityContexts - ConfigMaps and Secrets - Discover and use resources that extend Kubernetes (CRD, Operators) - ServiceAccounts |
| Application Design and Build | 20% | - Utilize persistent and ephemeral volumes - Understand multi-container Pod design patterns (e.g., sidecar, init and others) - Define, build and modify container images - Choose and use the right workload resource (Deployment, DaemonSet, CronJob, etc.) |
| Application Observability and Maintenance | 15% | - Utilize container logs - Implement probes and health checks - Use built-in CLI tools to monitor Kubernetes applications - Understand API deprecation policies - Debugging in Kubernetes |
| Services and Networking | 20% | - Provide and troubleshoot access to applications via services - Demonstrate basic understanding of NetworkPolicies - Use Ingress rules to expose applications |
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NEW QUESTION # 222
You have a stateful application that requires persistent storage. You need to create a PersistentV01umeClaim (PVC) that Will be used by a Deployment to store application dat a. The PVC should have the following specifications:
- Access Modes: ReadWriteOnce
- Storage Class: 'fast-storage
- Storage Size: IOGi
Provide the YAML code for creating this PVC.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. create the PVC YAML file:
2. Apply the PVC YAML using kubectl: bash kubectl apply -f my-pvc.yaml 3. Verify the PVC creatiom bash kubectl get pvc You should see the PVC ' my-pvc' listed with the specified access mode, storage class, and size.,
NEW QUESTION # 223
You are managing a Kubernetes cluster running a highly-available application that uses a custom resource called 'Orders. The 'orders resource is created and managed by a custom controller that ensures the order processing workflow runs flawlessly. However, the 'order' resource's validation rules have changed, requiring a new schema to be applied. How can you ensure that the existing 'Order' resources conform to the new schema without disrupting the application's functionality?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Define the New Schema:
- Create a new CustomResourceDefinition (CRD) file with the updated schema for the 'Order' resource.
- Ensure that the CRD's 'spec-validation.openAPlV3Schema' field includes all the new validation rules.
2. Update the CRD: - Apply the new CRD definition using 'kubectl apply -f order-crd.yaml'. 3. Create a Webhook for Validation: - Define a webhook in your Kubernetes cluster that will be responsible for validating the 'order' resources against the new schema. - Configure the webhook to be invoked during resource creation and update operations.
4. Deploy the Validation Service: - Create a deployment for the validation service that implements the logic for validating the 'Order' resources against the new schema. - The service should expose an endpoint that the webhook can communicate with.
5. Reconcile Existing Resources: - Once the validation webhook and service are deployed, create a temporary job that iterates through all existing 'Order resources. - The job snould validate each resource against tne new schema and automatically update any resources that do not comply.
By following these steps, you can ensure that your 'order' resources conform to the new schema without disrupting the application's functionality The validation webhook prevents new invalid resources from being created, and the reconciliation job ensures that existing resources are updated to meet the new schema requirements. This approach allows for smooth schema evolution and maintains the consistency of your data.,
NEW QUESTION # 224
You have a container image that contains a Python application. The application depends on specific libraries that are not included in the base image used for the container. Describe the steps involved in modifying the image to install the necessary libraries 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 'existing-image:latest' with the name of your current container image. - Replace 'requirements-txt' with the name of your file containing the list of Python libraries. 2. Build the Image: - Build the new image using the Dockerfile: 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 Skubectl 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 installed libraries. 6. Test the Application: - Access your application and ensure it functions correctly with the new libraries.
NEW QUESTION # 225
Context
Context
You have been tasked with scaling an existing deployment for availability, and creating a service to expose the deployment within your infrastructure.
Task
Start with the deployment named kdsn00101-deployment which has already been deployed to the namespace kdsn00101 . Edit it to:
* Add the func=webFrontEnd key/value label to the pod template metadata to identify the pod for the service definition
* Have 4 replicas
Next, create ana deploy in namespace kdsn00l01 a service that accomplishes the following:
* Exposes the service on TCP port 8080
* is mapped to me pods defined by the specification of kdsn00l01-deployment
* Is of type NodePort
* Has a name of cherry
Answer:
Explanation:
Solution:
NEW QUESTION # 226
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 # 227
......
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