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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Application Design and Build | 20% | - Utilize persistent and ephemeral volumes - Define, build and modify container images - Choose and use appropriate workload resources - Understand multi-container Pod design patterns |
| Topic 2: Application Deployment | 20% | - Implement deployment strategies - Use Helm package manager - Manage Deployments, rolling updates and rollbacks - Work with Kustomize |
| Topic 3: Application Observability and Maintenance | 15% | - Monitor applications using CLI tools - Work with container logs - Implement probes and health checks - Understand API deprecations - Debug applications in Kubernetes |
| Topic 4: Application Environment, Configuration and Security | 25% | - Create and consume Secrets - Work with ConfigMaps - Use custom resources and extensions - Apply application security settings - Use ServiceAccounts - Understand authentication, authorization and admission control - Configure resource requirements, limits and quotas |
| Topic 5: Services and Networking | 20% | - Understand and apply NetworkPolicies - Troubleshoot network access - Use Ingress rules - Expose applications via Services |
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45. Frage 
Set Configuration Context:
[student@node-1] $ | kubectl
Config use-context k8s
Context
You sometimes need to observe a pod's logs, and write those logs to a file for further analysis.
Task
Please complete the following;
* Deploy the counter pod to the cluster using the provided YAMLspec file at /opt/KDOB00201/counter.yaml
* Retrieve all currently available application logs from the running pod and store them in the file /opt
/KDOB0020l/log_Output.txt, which has already been created
Antwort:
Begründung:
See the solution below.
Explanation:
Solution:
To deploy the counter pod to the cluster using the provided YAML spec file, you can use the kubectl apply command. The apply command creates and updates resources in a cluster.
kubectl apply -f /opt/KDOB00201/counter.yaml
This command will create the pod in the cluster. You can use the kubectl get pods command to check the status of the pod and ensure that it is running.
kubectl get pods
To retrieve all currently available application logs from the running pod and store them in the file /opt
/KDOB0020l/log_Output.txt, you can use the kubectl logs command. The logs command retrieves logs from a container in a pod.
kubectl logs -f <pod-name> > /opt/KDOB0020l/log_Output.txt
Replace <pod-name> with the name of the pod.
You can also use -f option to stream the logs.
kubectl logs -f <pod-name> > /opt/KDOB0020l/log_Output.txt &
This command will retrieve the logs from the pod and write them to the /opt/KDOB0020l/log_Output.txt file.
Please note that the above command will retrieve all logs from the pod, including previous logs. If you want to retrieve only the new logs that are generated after running the command, you can add the --since flag to the kubectl logs command and specify a duration, for example --since=24h for logs generated in the last 24 hours.
Also, please note that, if the pod has multiple containers, you need to specify the container name using -c option.
kubectl logs -f <pod-name> -c <container-name> > /opt/KDOB0020l/log_Output.txt The above command will redirect the logs of the specified container to the file.
46. Frage
You have a Kustomization file that applies a patch to the 'spec-template-spec-containers-image' field of a Deployment However, you are now using a newer version of Kubernetes and have received warnings about the deprecated 'spec.template.spec' path. How can you update the Kustomization file to use the recommended API path, ensuring the patch still applies correctly?
Antwort:
Begründung:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Identify the Deprecated Path: The original Kustomization file likely has a patch like this:
Where 'patch.yamr contains:
2. IJpdate the Patch Path: Replace the deprecated path with the recommended one: Vspec/template/spec.containers/0/image' -> /spec/template.container/0/images
3. Apply the IJpdated Kustomizatiom Re-apply the Kustomization file With the updated patch. 4. Verify the Patch: Verify that the updated Deployment now uses the new image by checking the 'spec-template.spec.contajners.image' field. This example demonstrates updating a Kustomization file to use the correct API path for a patch. It is important to regularly review Kustomization files and apply any necessary updates to avoid issues with API deprecations and ensure compatibility with the latest Kubernetes versions.,
47. Frage
Exhibit:
Given a container that writes a log file in format A and a container that converts log files from format A to format B, create a deployment that runs both containers such that the log files from the first container are converted by the second container, emitting logs in format B.
Task:
* Create a deployment named deployment-xyz in the default namespace, that:
* Includes a primary
lfccncf/busybox:1 container, named logger-dev
* includes a sidecar Ifccncf/fluentd:v0.12 container, named adapter-zen
* Mounts a shared volume /tmp/log on both containers, which does not persist when the pod is deleted
* Instructs the logger-dev
container to run the command
which should output logs to /tmp/log/input.log in plain text format, with example values:
* The adapter-zen sidecar container should read /tmp/log/input.log and output the data to /tmp/log/output.* in Fluentd JSON format. Note that no knowledge of Fluentd is required to complete this task: all you will need to achieve this is to create the ConfigMap from the spec file provided at /opt/KDMC00102/fluentd-configma p.yaml , and mount that ConfigMap to /fluentd/etc in the adapter-zen sidecar container
Antwort: A
48. Frage
You're working on a Kubernetes application that involves retrieving data from a database. You have a Deployment With multiple pods, each accessing the database directly. To improve the application's performance and reliability, you want to implement an adapter pattern that introduces a service layer to handle database interactions. This layer should be responsible for connection pooling, caching, and error handling, making the application more resilient to database outages.
Antwort:
Begründung:
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. This will be used by the service layer to access the database.
- Apply the service account to the cluster: 'kubectl apply -f db-setvice-account.yamr 2. Create a Role and Role8inding: - Create a role that grants tne necessary permissions to access the database.
- Create a role binding that associates the role with the service account
- Apply the role and role binding to the cluster: - 'kubectl apply -f db-access-role.yaml' - 'kubectl apply -f db-access-binding.yaml 3. Create the Service Layer Deployment: - Deploy the service layer component. This can be a containerized application that handles database interactions.
- Apply the deployment: 'kubectl apply -f db.-service-yaml 4. Create a Secret for Database Credentials: - Create a secret to store sensitive database credentials.
- Apply the secret 'kubectl apply -f db-credentials.yaml' 5. Create a Service for the Service Layer: - Create a service to expose the service layer to the application pods.
- Apply the service: 'kuoectl apply -f db-seMce.yaml' 6. Llpdate the Application Deployment: - Update the Deployment for your main application to use the service layer.
T Test and Verify' - Verify the changes: - Check the logs for both the service layer and the application. - Test your application's functionality. Note: - Ensure to replace placeholders like ''. ''. ''. ''. ''. ''. and with your actual values. - This is a basic example, and you may need to adjust the configuration based on your specific service layer and database implementation. ,
49. Frage
Context
Task:
Create a Deployment named expose in the existing ckad00014 namespace running 6 replicas of a Pod. Specify a single container using the ifccncf/nginx: 1.13.7 image Add an environment variable named NGINX_PORT with the value 8001 to the container then expose port 8001
Antwort:
Begründung:
Solution:
50. Frage
......
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