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Node Affinity and Taints/Tolerations

Node Affinity allows you to constrain which nodes your pod is eligible to be scheduled on, based on node labels.

Types of Affinity:

  • RequiredDuringSchedulingIgnoredDuringExecution: Mandatory rules
  • PreferredDuringSchedulingIgnoredDuringExecution: Preferred but not enforced

Example Node Affinity:

affinity:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
      - matchExpressions:
        - key: disktype
          operator: In
          values:
          - ssd

Taints and Tolerations:

  • Taints: Applied to nodes to repel pods
  • Tolerations: Added to pods to allow scheduling on tainted nodes

Example:

tolerations:
- key: "key1"
  operator: "Equal"
  value: "value1"
  effect: "NoSchedule"

Taints and tolerations are powerful for workload isolation, while affinity helps with scheduling strategy and optimization.

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