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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