Certified Kubernetes Administrator (CKA) Practice Test

A DaemonSet in Kubernetes ensures that a specific Pod runs on all (or a subset of) nodes within a cluster. This is particularly useful for applications that need to perform node-specific tasks, such as monitoring, logging, or networking. When a DaemonSet is created, Kubernetes automatically schedules the specified Pods onto every eligible node. As new nodes join the cluster, the DaemonSet ensures that the Pods are also deployed on those nodes, providing a consistent presence of the application across the entire environment.

This functionality makes it distinct from other aspects of Kubernetes like persistent storage, scaling applications, or providing network security. While persistent storage is managed through PersistentVolume and PersistentVolumeClaim resources, scaling is handled by Deployments or ReplicaSets, and network security typically involves Network Policies and Ingress resources. Thus, the ability of a DaemonSet to guarantee that certain workloads are deployed on individual nodes is what accurately defines its purpose and usage in the Kubernetes ecosystem.