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Cheedge Lee
Cheedge Lee

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CKA Quick Check Points -- Pod Schedual

#kubernetes #affinity #taint #nodeselector

This is a quick recap for the points of pod schedual, details can click each title link or the final reference.

1. Affinity

  • nodeAffinity and nodeAntiAffinity
    • node labels
  • podAffinity and podAntiAffinity
    • pod labels
  • requiredDuringSchedulingIgnoredDuringExecution and preferredDuringSchedulingIgnoredDuringExecution
  • topologyKey

2. nodeName/nodeSelector 

spec: containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent nodeSelector: disktype: ssd --- spec: nodeName: foo-node # schedule pod to specific node containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent
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3. Taint/Tolerations

CMD 

k taint node NAME key[:value]:[EFFECT] k describe node NAME | grep -i taint
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yaml 

tolerations: - key: "example-key" operator: "Exists" effect: "NoSchedule" - key: "key1" operator: "Equal" value: "value1" effect: "NoExecute"
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4. Priority

The larger the higher

priorityclass 

k get priorityclass
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yaml 

spec: containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent priorityClassName: high-priority
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Reference

Different way to assign Pods to Nodes
Assign Pods to Nodes
Pod Priority and Preemption

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