Kubernetes - Scheduling
What is the effect of specifying
preferredDuringSchedulingIgnoredDuringExecution node affinity in a pod spec?What is the effect of specifying preferredDuringSchedulingIgnoredDuringExecution node affinity in a pod spec?
medium📝 Command Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand preferredDuringScheduling behavior
This affinity is a soft preference; scheduler tries to place pod on matching nodes but can schedule elsewhere if needed.Step 2: Match behavior with options
The scheduler tries to place the pod on matching nodes but allows others if none match correctly describes this behavior; others describe hard requirements or pod deletion/restart which are incorrect.Final Answer:
The scheduler tries to place the pod on matching nodes but allows others if none match -> Option BQuick Check:
Preferred affinity = soft scheduling preference [OK]
Quick Trick: Preferred affinity is a soft scheduling preference [OK]
Common Mistakes:
- Confusing preferred with required affinity
- Assuming pod deletion or restart on no match
- Thinking preferred affinity is mandatory
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