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default behaviour bit

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Matthew Wong
2016-08-19 19:07:08 -04:00
parent 0c5b27f2e6
commit d70418625e
1 changed files with 16 additions and 0 deletions
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docs/user-guide/persistent-volumes/index.md
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@@ -244,6 +244,22 @@ of a class, all of which are opaque to users, when first creating
`StorageClass` objects, and the objects cannot be updated once they are `StorageClass` objects, and the objects cannot be updated once they are
created. created.
Users don't necessarily have to request a `StorageClass` in their PVC. The
cluster treats PVCs that don't request a `StorageClass` differently depending
on whether the
[`SimpleDefaultStorageClassForPVC` admission controller](docs/admin/admission-controllers/#simpledefaultstorageclassforpvc) is turned on.
* If the admission controller is turned on, the administrator may specify a
default `StorageClass`. All PVCs that don't request a `StorageClass` will be
bound only to PVs of that default. Specifying a default `StorageClass` is done
by setting the annotation `storageclass.beta.kubernetes.io/is-default-class`
equal to "true" in a `StorageClass` object. If the administrator does not
specify a default, the cluster will respond to PVC creation as if the admission
controller were turned off. If more than one default is specified, the
admission controller will forbid the creation of all PVCs.
* If the admission controller is turned off, the claim may be bound to any
volume that does not belong to a `StorageClass` or that has a blank `""` value
for its `volume.beta.kubernetes.io/storage-class` annotation.
```yaml ```yaml
kind: StorageClass kind: StorageClass
apiVersion: extensions/v1beta1 apiVersion: extensions/v1beta1