Kubernetes - Scheduling
Which YAML snippet correctly defines a required node affinity that schedules pods only on nodes labeled
disktype: ssd?Which YAML snippet correctly defines a required node affinity that schedules pods only on nodes labeled disktype: ssd?
easy📝 Configuration Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify required node affinity syntax
Required node affinity usesrequiredDuringSchedulingIgnoredDuringExecutionwithnodeSelectorTermsandmatchExpressionsormatchLabels.Step 2: Check label and operator
nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: disktype operator: In values: - ssd correctly usesoperator: Inwith valuessdfor keydisktype.Step 3: Eliminate incorrect options
nodeAffinity: preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 preference: matchLabels: disktype: ssd uses preferred affinity, not required. nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchLabels: disktype: hdd uses wrong label value. nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: disktype operator: NotIn values: - ssd excludes ssd nodes.Final Answer:
Option A -> Option AQuick Check:
Required affinity usesrequiredDuringSchedulingIgnoredDuringExecutionwith correct label match [OK]
Quick Trick: Required affinity uses 'requiredDuringSchedulingIgnoredDuringExecution' [OK]
Common Mistakes:
- Using preferred affinity instead of required
- Using wrong label values
- Confusing 'In' and 'NotIn' operators
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