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Merge pull request #24590 from msau42/prebind 

storageclass name in pvc needs to be empty to match pv
pull/24625/head
Kubernetes Prow Robot 2020-10-17 10:42:12 -07:00 committed by GitHub
parent dcf0456dbe b01c0a2f6a
commit 27df2ed196
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6
content/en/docs/concepts/storage/persistent-volumes.md
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@ -185,25 +185,27 @@ If the PersistentVolume exists and has not reserved PersistentVolumeClaims throu
The binding happens regardless of some volume matching criteria, including node affinity.
The control plane still checks that [storage class](https://kubernetes.io/docs/concepts/storage/storage-classes/), access modes, and requested storage size are valid.
```
```yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: foo-pvc
namespace: foo
spec:
storageClassName: "" # Empty string must be explicitly set otherwise default StorageClass will be set
volumeName: foo-pv
...
```
This method does not guarantee any binding privileges to the PersistentVolume. If other PersistentVolumeClaims could use the PV that you specify, you first need to reserve that storage volume. Specify the relevant PersistentVolumeClaim in the `claimRef` field of the PV so that other PVCs can not bind to it.
```
```yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: foo-pv
spec:
storageClassName: ""
claimRef:
name: foo-pvc
namespace: foo