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Merge pull request #771 from gnufied/mount-option-ga 

Automatic merge from submit-queue

Proposal for taking mount option to GA

Also add support for specifying mount options
in storage classes.

cc @kubernetes/sig-storage-api-reviews @liggitt
This commit is contained in:
Kubernetes Submit Queue 2017-08-17 09:50:58 -07:00 committed by GitHub
parent 55ea030c85 58f9efd524
commit c21e7301b4
1 changed files with 48 additions and 3 deletions
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51
contributors/design-proposals/mount-options.md
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@ -13,9 +13,31 @@ Mount time options that are operationally important and have no security implica
## Design
We are going to add support for mount options in PVs as a beta feature to begin with.
### Mount option support in Persistent Volume Objects
Mount options can be specified as a field on PVs. For example:
``` yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv0003
spec:
capacity:
storage: 5Gi
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
mountOptions: "hard,nolock,nfsvers=3"
nfs:
path: /tmp
server: 172.17.0.2
```
Beta support for mount options introduced via `mount-options` annotation will be supported for near future
and deprecated in future.
Mount options can be specified as `mount-options` annotations in PV. For example:
``` yaml
apiVersion: v1
@ -35,6 +57,29 @@ Mount options can be specified as `mount-options` annotations in PV. For example
server: 172.17.0.2
```
### Mount option support in Storage Classes
Kubernetes admin can also specify mount option as a parameter in storage class.
```yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
name: slow
provisioner: kubernetes.io/glusterfs
parameters:
type: gp2
mountOptions: "auto_mount"
```
The mount option specified in Storage Class will be used while provisioning persistent volumes
and added as a field to PVs.
If admin has configured mount option for a storage type that does not support mount options,
then a "provisioning failed" event will be added to PVC and PVC will stay in pending state.
Also, if configured mount option is invalid then corresponding mount time failure error will be added to pod object.
## Preventing users from specifying mount options in inline volume specs of Pod
@ -42,7 +87,7 @@ While mount options enable more flexibility in how volumes are mounted, it can r
in user specifying options that are not supported or are known to be problematic when
using inline volume specs.
After much deliberation it was decided that - `mount-options` as an API parameter will not be supported
After much deliberation it was decided that - `mountOptions` as an API parameter will not be supported
for inline volume specs.
### Error handling and plugins that don't support mount option