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1. You are tasked with deploying a highly available application in OpenShift. Create a Deployment using YAML to deploy the nginx container with three replicas, ensuring that it runs successfully. Verify that the Deployment is active, all replicas are running, and the application can serve requests properly. Provide a complete walkthrough of the process, including necessary commands to check deployment status.

2. Your team requires an application to load specific configuration data dynamically during runtime. Create a ConfigMap to hold key-value pairs for application settings, and update an existing Deployment to use this ConfigMap. Provide a complete YAML definition for both the ConfigMap and the updated Deployment, and demonstrate how to validate that the configuration is applied correctly.

3. Your cluster requires an application to be exposed to external users. Use the OpenShift CLI to expose an application running on the nginx Deployment as a service, making it accessible via NodePort. Provide step-by-step instructions, including testing the accessibility of the service from the host machine.

4. Your organization needs a shared storage solution for an application running on OpenShift. Configure a PersistentVolume (PV) and a PersistentVolumeClaim (PVC), and update an existing Deployment to use this storage. Include a demonstration of how to validate that the storage is mounted correctly in the application pods.

5. Configure a Role-based Access Control (RBAC) setup to allow a user named dev-user to list all pods in the test-project namespace. Provide YAML definitions for the Role and RoleBinding, and demonstrate how to verify the permissions.

6. Troubleshoot a pod stuck in the CrashLoopBackOff state. Investigate and resolve an issue where the application fails due to a missing environment variable. Provide commands to identify the problem and fix it.

7. Use the OpenShift CLI to back up the resource configuration of the test-project namespace into a single file. Provide commands to export and restore these resources.

8. Deploy an application using a Helm chart. Use the nginx chart from the stable repository and provide instructions to customize the deployment.

9. Set up OpenShift monitoring to send email alerts when CPU usage exceeds 80% for any node. Include steps to configure an alert in Prometheus.

10. Inspect all events in the cluster and filter for warnings related to pods. Provide commands to gather and analyze the data.

11. View logs from all containers in a multi-container pod. Provide the command and describe how to analyze the logs for issues.

12. Deploy an application that uses a Secret to store database credentials. Create the Secret and demonstrate how to inject it into the application.

13. Manually schedule a pod on a specific node in the cluster by using a nodeSelector. Create a pod definition YAML and demonstrate how to verify that the pod is running on the desired node.

14. Perform a rolling update of an application to upgrade the nginx image from 1.19 to 1.21. Ensure zero downtime during the update and verify that all replicas are running the new version.

15. Use a Horizontal Pod Autoscaler (HPA) to scale the nginx Deployment based on CPU utilization. Create an HPA YAML definition, apply it, and simulate a CPU load to verify the scaling behavior.

16. Back up etcd data from the OpenShift cluster control plane and explain how to restore it in case of a

failure.

17. Troubleshoot a persistent volume claim (PVC) stuck in Pending state. Identify and resolve common issues such as storage class misconfiguration or unavailable PVs.

18. Audit all changes made to the resources in a namespace over the past day. Enable audit logging and provide commands to analyze logs for specific events.

19. Configure OpenShift logging to send application logs to an external Elasticsearch cluster. Include steps for Fluentd configuration and validation.

20. Use OpenShift product documentation to identify the steps for upgrading the cluster from version X to version Y. Demonstrate how to validate that the upgrade completed successfully.

21. Deploy an application across multiple namespaces using a common Deployment YAML file. Include steps to create the namespaces, apply the deployment, and verify that the pods are running in each namespace.

22. Simulate and troubleshoot a pod network issue where a pod cannot communicate with a service in the same namespace. Provide steps to identify and resolve the problem.

23. Implement a pod disruption budget (PDB) to ensure that at least one pod of a deployment is always running during maintenance events. Create a YAML file for the PDB and apply it to a deployment.

24. Create a custom OpenShift project with resource quotas to limit CPU and memory usage for all pods.

Include YAML definitions for the project and quota.

25. Configure a readiness probe for an application to ensure that traffic is sent only to pods that are fully ready. Include steps to create the probe in the Deployment YAML and test its functionality.

26. Use OpenShift logs to troubleshoot a service that intermittently fails to serve requests. Analyze both pod and service logs to determine the root cause.

27. Restore a previously backed-up namespace configuration into a newly created namespace. Include commands to rename the namespace in the backup file before applying it.

28. Perform a rolling restart of all pods in a deployment to update configurations without downtime. Provide commands and verify that the restart was successful.

29. Configure and validate a cluster-wide limit range to enforce CPU and memory limits for all newly created pods. Include the YAML definition and demonstrate how to test the limit enforcement.

30. Set up OpenShift to log all administrative actions performed by a specific user. Demonstrate how to analyze the logs for compliance purposes.

31. Configure an Ingress resource to expose an application using a custom domain name. Include steps to create the Ingress YAML and validate that the domain resolves to the application.

32. Troubleshoot and fix an issue where a pod fails to start due to insufficient resources. Identify the problem and reconfigure the deployment to ensure proper resource allocation.

33. Perform a node cordon and drain operation to safely remove all pods from a node for maintenance.

Include steps to validate that no workloads are running on the node after draining.

34. Configure and use a Kubernetes Job to run a batch process that executes a simple script. Include steps to define the Job YAML and verify its completion.

35. Configure OpenShift metrics monitoring to display custom metrics for a specific application. Include steps to expose metrics using a Prometheus exporter and validate their availability.

36. Debug a pod that remains in the ContainerCreating state due to missing images. Resolve the issue and ensure the pod is running.

37. Set up a ClusterRole and ClusterRoleBinding to allow a user named admin-user to view all resources across all namespaces. Provide YAML definitions and validation steps.

38. Use OpenShift CLI to enable and configure monitoring alerts for persistent volume usage exceeding 80%. Provide steps to test the alert functionality.

39. Migrate an application from one namespace to another without downtime. Include commands to copy configurations, secrets, and deployments.

40. Configure OpenShift autoscaling policies to handle a sudden traffic spike on an application. Simulate the spike and validate the scaling.