Which Kubernetes resource ensures that an instance of a pod runs on every node in the cluster?

• A. ReplicaSet
• B. DaemonSet
• C. Deployment
• D. StatefulSet

Answer: (B)

This question checks you know which resource is used to run a pod on every node. A DaemonSet ensures that a copy of a pod runs on all nodes in the cluster (or on all nodes that match a selection). It automatically creates the pod on each new node as it joins, and cleans up when a node leaves. This makes it ideal for node-level agents like log collectors or monitoring daemons that must operate on every node.

In contrast, a Deployment or ReplicaSet maintains a desired number of identical pods across the cluster, not per node, so it doesn’t guarantee one pod on each node. A StatefulSet focuses on stable identity and storage for a set of pods, not per-node coverage. So DaemonSet is the correct choice.