EX288 sample questions

Question 1

You are configuring a Red Hat OpenShift Pipeline (Tekton) to build and deploy a Java application. The pipeline consists of two tasks: build-app (which compiles the code using Maven) and build-image (which uses Buildah to create a container image). The build-app task produces a JAR file that the build-image task requires. However, the build-image task fails immediately, stating the JAR file cannot be found. You have verified the JAR is successfully created in the first task.

Which configuration is required to persist and share files between these two tasks?

Accepted Answer

Define a `Workspace` in the Pipeline and bind it to a PersistentVolumeClaim (PVC) in the PipelineRun, then mount this workspace in both tasks.

Answer

Configure a `PipelineResource` of type `storage` and link it to both tasks.

Answer

Set the `runAsUser` security context to 0 for both tasks to ensure they have root access to the node's temporary filesystem.

Answer

Use the `results` field in the `build-app` task to pass the binary content of the JAR file directly to the `params` of the `build-image` task.

Question 2

A developer is customizing a Source-to-Image (S2I) build for a Python application. The application requires a specific configuration file to be generated dynamically based on environment variables before the application starts, but after the dependencies are installed. The developer decides to provide a custom S2I script in the source repository.

Which script must the developer create, and where should it be placed in the source code repository to override the default behavior?

Accepted Answer

Create a script named `assemble` and place it in `.s2i/bin/`.

Answer

Create a script named `usage` and place it in the root directory.

Answer

Create a script named `run` and place it in `.s2i/bin/`.

Answer

Create a script named `save-artifacts` and place it in `s2i/scripts/`.

Question 3

You are deploying a legacy Java application that takes approximately 90 seconds to initialize and accept connections. You configure a Liveness probe to check the endpoint /healthz every 10 seconds. During deployment, you observe that the Pod enters a CrashLoopBackOff state because the Liveness probe fails before the application is ready.

Which configuration change is the BEST practice to resolve this issue without compromising the ongoing failure detection capability?

Accepted Answer

Configure a `startupProbe` targeting the same endpoint with a `failureThreshold` and `periodSeconds` that covers the 90-second window.

Answer

Remove the Liveness probe and rely solely on the Readiness probe.

Answer

Change the Liveness probe type from `httpGet` to `exec` to run a script that sleeps for 90 seconds.

Answer

Increase the `initialDelaySeconds` of the Liveness probe to 100 seconds.

Question 4

A developer needs to deploy an application to OpenShift using a Helm chart. The chart is stored in a local directory named ./my-chart. The developer wants to install the chart into the frontend project with the release name web-ui, setting the replica count to 3 via the command line.

Which command achieves this?

Accepted Answer

helm install web-ui ./my-chart --namespace frontend --set replicaCount=3

Answer

oc new-app ./my-chart --name web-ui -n frontend --param replicaCount=3

Answer

helm upgrade --install web-ui ./my-chart -n frontend --values replicaCount=3

Answer

oc create helm-release web-ui --source ./my-chart --project frontend --replicas 3

Question 5

You are managing a microservices application using Kustomize. You have a base directory containing the common resources and an overlays/prod directory for production-specific changes. You want to add a prefix prod- to all resources deployed from the production overlay and apply a common label env: prod.

Which fields should you add to the kustomization.yaml file in the overlays/prod directory?

Accepted Answer

namePrefix: prod- commonLabels: env: prod

Answer

resourcePrefix: prod- globalLabels: env: prod

Answer

prefix: prod- labels: env: prod

Answer

namespace: prod- selector: env: prod

Question 6

You need to create a Kubernetes Secret from a local file named db-creds.json to be used by a Pod. The key in the secret should be credentials.

Which command will create this secret in the current project?

Accepted Answer

oc create secret generic my-secret --from-file=credentials=db-creds.json

Answer

oc create secret json my-secret --data db-creds.json

Answer

oc secrets new my-secret credentials=db-creds.json

Answer

oc create secret generic my-secret --from-literal=credentials=@db-creds.json

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