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

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.

Answer

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

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 `run` and place it in `.s2i/bin/`.

Answer

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

Answer

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

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

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

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.

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

Answer

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

Answer

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

prefix: prod-
labels:
env: prod

Answer

resourcePrefix: prod-
globalLabels:
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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Free EX288 sample questions

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?

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