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fix admission controller bit

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This commit is contained in:
Matthew Wong
2016-08-23 07:41:32 -04:00
parent edbac93ea8
commit 4e486e97b6
1 changed files with 12 additions and 12 deletions
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docs/user-guide/persistent-volumes/index.md
+12 -12
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@@ -227,26 +227,26 @@ A claim can request a particular class by specifying the name of a
Only PVs of the requested class, ones with the same annotation as the PVC, can
be bound to the PVC.
PVCs don't necessarily have to request a class, they can omit the annotation or
set it to `""`. The cluster treats PVCs that don't request a class differently
depending on whether the
PVCs don't necessarily have to request a class. A PVC with its annotation set
equal to `""` is always interpreted to be requesting a PV with no class, so it
can only be bound to PVs with no class (no annotation or one set equal to
`""`). A PVC with no annotation is not quite the same and is treated differently
by the cluster 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` can be
bound only to PVs of that default. A consequence of this is that the PVs those
PVCs would normally be bound to, the PVs that have no class (no annotation or annotation
equal to `""`), are unable to be bound to any PVC. 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
default `StorageClass`. All PVCs that have no annotation can 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 responds to PVC creation as if the admission controller were turned off.
If more than one default is specified, the admission controller forbids the
creation of all PVCs.
* If the admission controller is turned off, there is no notion of a default
`StorageClass`. All PVCs that don't request a `StorageClass` can be bound only
to PVs that have no class.
`StorageClass`. All PVCs that have no annotation can be bound only to PVs that
have no class. In this case the PVCs that have no annotation are treated the
same way as PVCs that have their annotation set to `""`.
In the future after beta, the `volume.beta.kubernetes.io/storage-class`
annotation will become an attribute.