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Scenario #384
Storage
Kubernetes v1.23, AWS EBS

ReadWriteOnce PVC Mounted by Multiple Pods

Attempt to mount a ReadWriteOnce PVC on two pods in different AZs failed silently.

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What Happened

Pods scheduled across AZs ; EBS volume couldn't attach to multiple nodes.

Diagnosis Steps
  • 1Pods stuck in ContainerCreating.
  • 2Events showed volume not attachable.
Root Cause

ReadWriteOnce restriction and AZ mismatch.

Fix/Workaround
• Updated deployment to use ReadWriteMany (EFS) for shared access.
Lessons Learned

RWX vs RWO behavior varies by volume type.

How to Avoid
  • 1Use appropriate access modes per workload.
  • 2Restrict scheduling to compatible zones.
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