Kubernetes Container Orchestration Operators and Custom Resources 2

Question 1

What is the role of a finalizer in Kubernetes custom resources?

Accepted Answer

To ensure cleanup actions are performed before a resource is deleted

Answer

Finalizers are string keys on a resource's metadata that block deletion until a controller removes them after completing required cleanup actions.

Question 2

What does the observedGeneration field in a custom resource status indicate?

Accepted Answer

The resource spec generation that the controller last successfully reconciled

Answer

The observedGeneration field tracks which spec generation the controller has last processed, allowing users to detect if the controller is in sync with the latest spec.

Question 3

Which type of admission webhook can modify objects before they are persisted in Kubernetes?

Accepted Answer

Mutating admission webhook

Answer

Mutating admission webhooks can modify resource objects — injecting fields, setting defaults, or adding sidecars — before they are stored in etcd.

Question 4

What is a conversion webhook used for in Custom Resource Definitions?

Accepted Answer

Converting custom resource objects between different stored API versions as the CRD evolves

Answer

Conversion webhooks translate custom resource objects between API versions, enabling backward compatibility as the CRD schema evolves.

Question 5

In the Operator Capability Level model, what does Level 2 (Seamless Upgrades) mean?

Accepted Answer

The operator can manage and orchestrate application version upgrades

Answer

Level 2 in the Operator Capability Levels means the operator can handle application upgrades seamlessly without manual steps.

Kubernetes Container Orchestration Practice Test

Kubernetes Container Orchestration Practice Test

Kubernetes Container Orchestration Operators and Custom Resources 2