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Merge pull request #1218 from jsafrane/default-class-1.4

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Add documentation about DefaultStorageClass plugin (1.4)
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devin-donnelly
2016-09-13 14:51:18 -07:00
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docs/admin/admission-controllers.md
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@@ -125,10 +125,31 @@ and ensures that requests in a non-existent `Namespace` are rejected.
A `Namespace` deletion kicks off a sequence of operations that remove all objects (pods, services, etc.) in that A `Namespace` deletion kicks off a sequence of operations that remove all objects (pods, services, etc.) in that
namespace. In order to enforce integrity of that process, we strongly recommend running this plug-in. namespace. In order to enforce integrity of that process, we strongly recommend running this plug-in.
### DefaultStorageClass
This plug-in observes creation of `PersistentVolumeClaim` objects that do not request any specific storage class
and automatically adds a default storage class to them.
This way, users that do not request any special storage class do no need to care about them at all and they
will get the default one.
This plug-in does not do anything when no default storage class is configured. When more than one storage
class is marked as default, it rejects any creation of `PersistentVolumeClaim` with an error and administrator
must revisit `StorageClass` objects and mark only one as default.
This plugin ignores any `PersistentVolumeClaim` updates, it acts only on creation.
See [persistent volume](/docs/user-guide/persistent-volumes) documentation about persistent volume claims and
storage classes and how to mark a storage class as default.
## Is there a recommended set of plug-ins to use? ## Is there a recommended set of plug-ins to use?
Yes. Yes.
For Kubernetes >= 1.4.0, we strongly recommend running the following set of admission control plug-ins (order matters):
```shell
--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota
```
For Kubernetes >= 1.2.0, we strongly recommend running the following set of admission control plug-ins (order matters): For Kubernetes >= 1.2.0, we strongly recommend running the following set of admission control plug-ins (order matters):
```shell ```shell