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Scenario #328
Storage
Kubernetes v1.22, Local PVs

Pod Eviction Due to DiskPressure Despite PVC

Node evicted pods due to DiskPressure, even though app used dedicated PVC backed by a separate disk.

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What Happened

Node root disk filled up with log data, triggering eviction manager. The PVC itself was healthy and not full.

Diagnosis Steps
  • 1Node describe: showed DiskPressure condition true.
  • 2Application pod evicted due to node pressure, not volume pressure.
  • 3Root disk had full /var/log.
Root Cause

Kubelet doesn’t distinguish between root disk and attached volumes for eviction triggers.

Fix/Workaround
• Cleaned logs from root disk.
• Moved logging to PVC-backed location.
Lessons Learned

PVCs don’t protect from node-level disk pressure.

How to Avoid
  • 1Monitor node root disks in addition to volume usage.
  • 2Redirect logs and temp files to PVCs.
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