Kubernetes Interview Questions and Answer Part – 8

What is the primary application transport mechanism for the Kubernetes API Server?

• Server side RPC calls
• Javascript over WebSockets
• TCP multiplexing over HTTP/S
• JSON Over HTTP/S (Ans)

Objects in the Kubernetes API are organized by which following methods?

• Kind, Group and API Version (Ans)
• etcd’s concurrency model
• Object level resourceVersion
• Key value store

Which kubectl command will retrieve the definition/documentation for an API Object from the API Server?

• get document
• –objectName
• explain (Ans)
• get object

As new API Versions become available what is the release cadence?

• Alpha -> Beta -> Stable (Ans)
• Versioning
• Stable – > Production -> Primary Release
• Release

If you needed to assign workload to a subset of nodes in your cluster, what method would you choose so that you are not dependent on the Node names in the cluster?

• Annotate the nodes and use a hardwareSelector in your Pod Spec
• Annotate the nodes and use a namespace in your Pod Spec
• Label the nodes and use a nodeSelector in your Pod Spec
• This is not possible in Kubernetes due to it’s declarative model for deployments (Ans)

Which of the following will remove the label disk from a node?

• kubectl label node c1-node2 disk
• kubectl relabel node c1-node2 disk-
• kubectl label node c1-node2 disk-
• kubectl remove label node c1-node2 disk (Ans)

What is the primary function of a Controller in Kubernetes?

• Running bare/naked Pods
• Migrating Pod workloads to the Cloud
• Migrating Pod workloads between Nodes
• To keep your application in the desired state (Ans)

What is the primary design goal for using multi-container Pods?

• Scaling stateful containers
• Tightly coupled applications (Ans)
• More flexible recovery options when restarting Pods
• Scaling stateless containers

Which of the following is the appropriate order of a Pod’s lifecycle?

• Creation -> Running -> Restart
• PodSpec -> Running -> Termination
• Kubectl run -> Running -> Termination
• Creation -> Running -> Termination (Ans)

Which container restart policy will restart a container only on a non-zero exit code?

• OnFailure (Ans)
• Never
• OnNonZeroExitCode
• Always

For Kubernetes API Objects that were part of the initial releases, which API Group are they in?

• They’ve been refactored into their appropriate API Groups
• Fundamental
• Workload
• Core/Legacy (Ans)

What is the primary way to subdivide a cluster on the basis of resource isolation and/or organization?

• Namespace (Ans)
• Label
• Annotation
• Subclustering/Federation

What is the primary way in Kubernetes to execute a command on a grouping of resources based on using a selector?

• Annotations
• Labels (Ans)
• Querying
• Namespaces

What is the primary way to store information along with your resources in the cluster?

• Annotations (Ans)
• resourceNotes
• Labels
• Namespaces

Which of the following will return the pods whose label is app=prod?

• kubectl get pods -l app=prod (Ans)
• kubectl get pods -l app<>prod
• kubectl get pods -l prod
• kubectl get pods -l app!=prod

What is the primary unit of allocating work in a Kubernetes Cluster?

• Manifest
• Pod (Ans)
• Deployment
• Container

What is the primary function of a Controller in Kubernetes?

• To keep your application in the desired state (Ans)
• Migrating Pod workloads to the Cloud
• Migrating Pod workloads between Nodes
• Running bare/naked Pods

When using kubectl exec, a connection is first made to what cluster component prior to sending the command to the Pod?

• The Controller Manager
• The API Server (Ans)
• The Scheduler
• The Kubelet

Which type of container probe will restart your container on probe failure?

• livenessProbe (Ans)
• SIGTERM
• readinessProbe
• SIGKILL

Rajesh Kumar

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