Kubernetes Container Orchestration Operators and Custom Resources

Question 1

What is a Custom Resource Definition (CRD) in Kubernetes?

Accepted Answer

An extension mechanism that allows defining new resource types in the Kubernetes API

Answer

A built-in Kubernetes resource type that ships with every cluster

Answer

A type of Pod that runs custom application workloads

Answer

A configuration file format used by Helm charts

Question 2

What is the primary purpose of a Kubernetes Operator?

Accepted Answer

To automate the management of complex stateful applications using domain-specific knowledge

Answer

To operate and maintain the Kubernetes control plane components

Answer

To deploy containers directly to worker nodes via the kubelet

Answer

To configure network policies for inter-pod communication

Question 3

Which API group is used for managing Custom Resource Definitions?

Accepted Answer

apiextensions.k8s.io/v1

Answer

apps/v1

Answer

core/v1

Answer

rbac.authorization.k8s.io/v1

Question 4

What is a controller in the Kubernetes operator pattern?

Accepted Answer

A reconciliation loop that watches resources and takes actions to match desired state

Answer

A user interface for managing and visualizing Kubernetes clusters

Answer

A network controller that manages ingress traffic routing rules

Answer

A storage controller that provisions and manages persistent volumes

Question 5

Which tool is the official framework for scaffolding and building Kubernetes Operators?

Accepted Answer

Operator SDK

Answer

kubectl

Answer

kubeadm

Answer

kustomize

Question 6

What scope options are available when defining a Custom Resource Definition?

Accepted Answer

Either Namespaced or Cluster scope

Answer

Operators scope and Controllers scope only

Answer

Always cluster-wide scope only

Answer

Always namespace-scoped only

Question 7

What is the purpose of OpenAPI v3 schema validation in a CRD?

Accepted Answer

To define the schema and validate fields when custom resource instances are created or updated

Answer

To authenticate users who access the custom resource via the API

Answer

To validate the health and connectivity of cluster nodes

Answer

To check network connectivity between pods using the custom resource