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問題 #17 
Task
Create a new deployment for running.nginx with the following parameters;
* Run the deployment in the kdpd00201 namespace. The namespace has already been created
* Name the deployment frontend and configure with 4 replicas
* Configure the pod with a container image of lfccncf/nginx:1.13.7
* Set an environment variable of NGINX__PORT=8080 and also expose that port for the container above
答案：
解題說明：
See the solution below.
Explanation:
Solution:
問題 #18
You have a Deployment named 'wordpress-deployment' that runs 3 replicas of a WordPress container. You want to ensure that the deployment is always updated with the latest image available in the 'wordpress/wordpress:latest' Docker Hub repository However, you need to implement a rolling update strategy that allows for a maximum ot two pods to be unavailable during the update process.
答案：
解題說明：
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. IJpdate the Deployment YAML:
- Update the 'replicas to 3-
- Define 'maxunavailable: 2 and 'maxSurge: in the 'strategy.rollingupdate' section.
- Configure a 'strategy-type' to 'RollinglJpdate' to trigger a rolling update when the deployment is updated.
- Add a 'spec-template-spec-imagePullPolicy: Always' to ensure that the new image is pulled even if it exists in the pod's local cache.
2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f wordpress-deployment.yamr 3. Verify the Deployment: - Check tne status of the deployment using 'kubectl get deployments wordpress-deployment' to confirm the rollout and updated replica count. 4. Trigger the Automatic Update: - Push a new image to the 'wordpress/wordpress:latest Docker Hub repository. 5. Monitor the Deployment: - Use 'kubectl get pods -I app=wordpress' to monitor the pod updates during the rolling update process. You will observe that two pods are terminated at a time, while two new pods with the updated image are created. 6. Check for Successful Update: - Once the deployment is complete, use 'kubectl describe deployment wordpress-deployment' to see that the 'updatedReplicaS field matches the 'replicas' field, indicating a successful update.
問題 #19
You are building a web application with two microservices: a frontend service ('frontend') and a backend service ( ' backend'). The frontend service requires access to the backend service, which iS exposed on port 8080 within the Kubernetes cluster. How would you configure an Ingress resource to direct traffic to the correct service based on the hostname, ensuring that the frontend service can access the backend service internally without exposing the backend service to the public internet?
答案：
解題說明：
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service tor the Backend Service:
- Define a Service for the 'backend' service, exposing it internally within the Kubernetes cluster on port 8080.
2. Configure the Ingress Resource: - Create an Ingress resource that directs traffic to the frontend service based on the hostname, allowing the frontend service to access the backend service internally without exposing it to the public internet - Define the Ingress rule to map the hostname 'frontend-example.com' to the 'frontend' service on port 80. - Configure an Ingress rule to enable access to the 'backend' service on port 8080 using the hostname 'internal-backend-example-com' within the Kubernetes cluster.
3. Create a Secret for the Frontend TLS Certificate: - Create a Secret in Kubernetes to store the TLS certificate and key for the frontend service.
4. Apply the Resources: - Apply the Service, Ingress, and Secret YAML files to your Kubernetes cluster using 'kubectl apply -f 5. Access the Frontend Service: - Access the frontend service using the hostname 'frontend-example.com'. The frontend service can now access the backend service internally using the hostname 'internal-backend-example-com' without exposing the backend service to the public internet.]
問題 #20
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?
答案：
解題說明：
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.,
問題 #21
You nave a Deployment tnat runs an application that requires specific environment variables to be set. These variables snould be different for each Pod in the Deployment- How would you use a Daemonset to generate unique environment variables for each Pod based on its hostname?
答案：
解題說明：
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Create a DaemonSet:
- Define a Daemonset named 'env-generator' that will run a container on every node in the cluster.
- The container in the Daemonset will be responsible tor generating unique environment variables for each Pod.
- Replace 'your-env-generator-image:latest with the actual image you want to use for the DaemonSet.
問題 #22
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