Certified Kubernetes Administrator (CKA) Practice Test

A daemonset in Kubernetes is designed to ensure that a specific pod runs on all or a subset of nodes in a cluster automatically. This is particularly useful for deploying system-level applications like monitoring agents or log collectors that need to operate on every node. By using a daemonset, when new nodes are added to the cluster, the specified pod will be automatically scheduled to run on those nodes as well, maintaining consistent behavior across the cluster.

The choice highlighting node restrictions pertains more to Node Affinity and Taints and Tolerations features rather than daemonsets. Managing the lifecycle of static pods is not within the scope of a daemonset, as static pods are predefined and managed by the kubelet directly, bypassing Kubernetes' scheduling mechanism. Monitoring node health is a function that might be performed by pods running as daemonsets, but it is not the defining feature of a daemonset itself. Thus, the central purpose of a daemonset aligns perfectly with ensuring that particular pods are always running on designated nodes throughout the cluster.