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DaemonSet: one pod per node

A Deployment manages N replicas placed anywhere; a StatefulSet manages N pods with identity. The DaemonSet is the third model: it doesn't count replicas but guarantees exactly one pod per node — add a node and a pod appears, remove a node and it vanishes. The mold for log agents, CNI, node exporters. This article digs into how it pins a pod to each node, why its pods run even on a not-ready node, and how to limit it to a group of nodes — tested on two real workers.