KCNA Container Orchestration Practice Question
You want to ensure that a Pod runs on every Node in the cluster. Which resource should you use?
⚠ Common exam trap
CNCF often tests the misconception that a Deployment with a replica count equal to the number of Nodes will achieve the same effect, but candidates overlook that Deployments do not enforce per-Node scheduling and can leave some Nodes empty due to scheduling constraints or resource limits.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DaemonSet
A DaemonSet ensures that a copy of a Pod runs on every Node in the cluster, including when new Nodes are added. This is the correct resource for cluster-wide services like log collectors, monitoring agents, or kube-proxy, as it automatically schedules a Pod on each Node and respects node taints and tolerations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deployment
Why it's wrong here
Deployments run a specified number of replicas, not necessarily one per node.
- ✓
DaemonSet
Why this is correct
DaemonSets run a Pod on each Node (or a subset if nodeSelector is used).
- ✗
ReplicaSet
Why it's wrong here
ReplicaSets ensure a desired number of replicas, not per-node.
- ✗
StatefulSet
Why it's wrong here
StatefulSets manage stateful applications with unique network identities.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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