Question

A developer creates a PersistentVolumeClaim with accessMode ReadWriteOnce (RWO) and attaches it to a Deployment. They then scale the Deployment to 3 replicas, but the two new pods remain stuck in ContainerCreating with volume attachment errors, while the original pod runs fine. What is the most likely cause?

Accepted Answer

A ReadWriteOnce volume can be mounted as read-write by only one node at a time, so pods scheduled to other nodes cannot attach it.

Answer

ReadWriteOnce volumes require a headless Service to allow multiple pods to mount them concurrently.

Answer

The PersistentVolumeClaim must be recreated with a larger storage request before additional pods can bind to it.

Answer

ReadWriteOnce means the volume is read-only, so only the first pod that writes to it can start.