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

To finalize and mark the deployment of a resource as complete

Answer

To trigger resource upgrades when a new version is available

Answer

To mark a batch job resource as finished after processing

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 total number of replicas currently observed running

Answer

The Kubernetes API server version currently being used

Answer

The number of times the resource spec was updated by a user

Question 3

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

Accepted Answer

Mutating admission webhook

Answer

Validating admission webhook

Answer

Defaulting admission webhook

Answer

Converting admission webhook

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

Converting resource specifications from JSON to YAML format for storage

Answer

Converting namespaced custom resources to cluster-scoped resources

Answer

Converting container-based workloads to VM-based workloads

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

The operator can install the application on a fresh cluster

Answer

The operator provides full auto-pilot with no human intervention needed

Answer

The operator uses level 2 TLS encryption for all communications

Question 6

What is the purpose of enabling the status subresource in a CRD?

Accepted Answer

To allow updating status separately from spec without triggering unnecessary reconciliation

Answer

To define the desired configuration state of the custom resource

Answer

To expose the resource's status metrics to Prometheus for monitoring

Answer

To store audit logs and change history for the custom resource

Question 7

What is the relationship between a CRD and a Custom Resource (CR)?

Accepted Answer

A CRD defines the type schema; a CR is a specific instance created from that schema

Answer

They are the same Kubernetes object with different names

Answer

A CR is a container for grouping multiple CRD definitions together

Answer

CRDs are a deprecated predecessor to the newer CR specification format