KCNA Container Orchestration 3

Question 1

Which Kubernetes resource guarantees that a minimum number of Pods in a Deployment remain available during voluntary disruptions?

Accepted Answer

PodDisruptionBudget

Answer

A PodDisruptionBudget (PDB) limits the number of Pods of a replicated application that are down simultaneously during voluntary disruptions.

Question 2

What is the effect of adding a taint `NoSchedule` to a node?

Accepted Answer

New Pods without a matching toleration will not be scheduled on the node

Answer

A `NoSchedule` taint prevents new Pods from being scheduled on the node unless they have a matching toleration.

Question 3

In a StatefulSet, how are Pods named?

Accepted Answer

Sequential ordinal names (e.g., pod-0, pod-1)

Answer

StatefulSet Pods receive stable, predictable names using an ordinal index appended to the StatefulSet name.

Question 4

Which Kubernetes object is best suited for running a batch job that should execute to completion exactly once?

Accepted Answer

Job

Answer

A Job creates one or more Pods and ensures they successfully terminate, making it ideal for one-time batch tasks.

Question 5

What does the `imagePullPolicy: Always` setting do in a container spec?

Accepted Answer

Pulls the image every time the container starts, even if locally cached

Answer

With `Always`, Kubernetes pulls the container image from the registry on every Pod start, bypassing the local cache.

(KCNA) Kubernetes and Cloud Native Associate Practice Test