Your team manages a custom resource type 'Database' defined via a CRD. A developer reports that `kubectl get databases` fails with 'no matches for kind Database'. You verify the CRD exists and is in the 'Established' condition. Which command should you run first to diagnose the issue?

kubectl get databases --all-namespaces

kubectl api-resources | grep database

kubectl get crd databases.example.com -o yaml

Your team has an Operator that manages 'App' custom resources. The Operator creates a Deployment for each App. You need to update the Operator to support a new field 'spec.replicas' that should override the default replica count. The Operator currently uses the Deployment's default replicas. What is the best way to implement this change?

Use a mutating admission webhook to set the Deployment replicas based on the App spec.

Modify the Operator's reconciliation logic to read 'spec.replicas' and set it on the Deployment.

Create a new CRD for Deployments and link it to the App resource.

Update the CRD schema to include 'spec.replicas' and rely on the API server to set the Deployment replicas.

Certified Kubernetes Application Developer (CKAD)

Domain 4Objective 4

Extending Kubernetes CKAD Practice Questions (Page 3)

Part of the Application Environment, Configuration and Security domain, which accounts for 25% of the CKAD exam. Linux Foundation does not publish an official question count, but from its 120-minute exam (~50–80 total, ~13–20 in this domain), expect 3–5 from this objective — we provide 18 practice questions to prepare you well beyond it. (estimate)

18questions here

4free pages

4concepts

25%of the exam

Questions 11–15

11foundation · easy
Which kubectl command lists all resource types available in a cluster, including custom resources?
Select an answer first
12application · medium
Your team manages a custom resource type 'Database' defined via a CRD. A developer reports that `kubectl get databases` fails with 'no matches for kind Database'. You verify the CRD exists and is in the 'Established' condition. Which command should you run first to diagnose the issue?
Select an answer first
13expert · easy
Your organization wants to create a custom resource 'ClusterConfig' that is cluster-scoped and will be used by an Operator to configure cluster-wide settings. The CRD must be available in all namespaces. Which scope should you set in the CRD?
Select an answer first
14expert · medium
Your team has an Operator that manages 'App' custom resources. The Operator creates a Deployment for each App. You need to update the Operator to support a new field 'spec.replicas' that should override the default replica count. The Operator currently uses the Deployment's default replicas. What is the best way to implement this change?
Select an answer first
15application · easy
You are troubleshooting why a custom resource 'Backup' is not being reconciled by its Operator. You want to verify that the API server is serving the resource and that the Operator can see it. Which command lists all custom resources of type 'Backup' in the cluster?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to CKAD

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Linux Foundation. “CKAD” is a trademark of its owner, used for identification only.

Extending Kubernetes CKAD Practice Questions (Page 3)

Questions 11–15

Which kubectl command lists all resource types available in a cluster, including custom resources?

Your team manages a custom resource type 'Database' defined via a CRD. A developer reports that `kubectl get databases` fails with 'no matches for kind Database'. You verify the CRD exists and is in the 'Established' condition. Which command should you run first to diagnose the issue?

Your organization wants to create a custom resource 'ClusterConfig' that is cluster-scoped and will be used by an Operator to configure cluster-wide settings. The CRD must be available in all namespaces. Which scope should you set in the CRD?

You are troubleshooting why a custom resource 'Backup' is not being reconciled by its Operator. You want to verify that the API server is serving the resource and that the Operator can see it. Which command lists all custom resources of type 'Backup' in the cluster?

Keep studying — Application Environment, Configuration and Security