Kubernetes - Persistent Storage
You want to update the container image of a StatefulSet without downtime, ensuring pods restart one by one in order. Which update strategy should you use?
You want to update the container image of a StatefulSet without downtime, ensuring pods restart one by one in order. Which update strategy should you use?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand StatefulSet update strategies
RollingUpdate updates pods in order, respecting pod ordinal index; partition controls which pods update.Step 2: Use partition to control update order
Setting partition to 0 (default) updates all pods sequentially from the highest ordinal index down to 0, one by one without downtime.Final Answer:
RollingUpdate with partition set to 0 -> Option BQuick Check:
Partition controls pod update order in RollingUpdate [OK]
Quick Trick: Use RollingUpdate with partition to update pods one by one [OK]
Common Mistakes:
- Using OnDelete causes manual pod restarts, not automatic
- Recreate deletes all pods causing downtime
- RollingUpdate with partition set to the last pod index only updates higher ordinal pods
Master "Persistent Storage" in Kubernetes
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