Multi-Attach error ☸️ Kubernetes

Multi-Attach error for volume: Volume is already exclusively attached to one node and can't be attached to another

A ReadWriteOnce volume (EBS, Azure Disk, PD) is still attached to another node, so the new pod on a different node can’t use it.

Seen on: Kubernetes

Meaning

Block volumes can attach to one node at a time. During rolling updates or after a node failure, the new pod lands on another node before the old attachment is released. Deployments with RWO volumes and RollingUpdate strategy hit this constantly.

Common causes

  • Rolling update starts the new pod before the old one releases the volume
  • Old node died and the attachment wasn’t cleaned up
  • More than one replica sharing an RWO PVC

⚡ Quick fix

  1. Use strategy: Recreate for single-replica Deployments with RWO volumes
  2. Use a StatefulSet (one PVC per replica)
  3. Delete the stale VolumeAttachment after the old node is gone

Detailed fix by platform

Kubernetes

  1. bash
    kubectl get volumeattachment | grep pvc-1234
kubectl patch deploy db -p '{"spec":{"strategy":{"type":"Recreate","rollingUpdate":null}}}'

How to diagnose

  1. Attachment — Which node holds it?
  2. Replicas — More than one pod using the PVC?
  3. Strategy — RollingUpdate with RWO?

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