Kubernetes Node Selectors vs Node Affinity: How to Control Pod Placement
Kubernetes allows users to guide the scheduler by labeling nodes and configuring pods to target those labels using nodeSelector or node affinity rules. nodeSelector offers a simple key-value match, placing a pod only on nodes that carry every specified label. Node affinity extends this with expressive operators like In, NotIn, Exists, and Gt, and supports both hard requirements and weighted soft preferences. The 'IgnoredDuringExecution' behavior means that once a pod is running, changes to node labels do not trigger eviction or rescheduling. These tools help bridge gaps the scheduler cannot fill on its own, such as routing workloads to GPU-equipped or SSD-backed nodes.
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