Merge pull request #247 from Madhu-1/raw-block

update readme for raw-block PVC
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Huamin Chen 2019-03-07 08:30:55 -05:00 committed by GitHub
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3 changed files with 97 additions and 4 deletions

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@ -128,7 +128,7 @@ Modify your current storage class, or create a new storage class specifically
for multi node writers by adding the `multiNodeWritable: "enabled"` entry to
your parameters. Here's an example:
```
```yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
@ -153,7 +153,7 @@ reclaimPolicy: Delete
Now, you can request Claims from the configured storage class that include
the `ReadWriteMany` access mode:
```
```yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
@ -169,7 +169,7 @@ spec:
Create a POD that uses this PVC:
```
```yaml
apiVersion: v1
kind: Pod
metadata:
@ -195,7 +195,7 @@ Now, we can create a second POD (ensure the POD is scheduled on a different
node; multiwriter single node works without this feature) that also uses this
PVC at the same time
```
```yaml
apiVersion: v1
kind: Pod
metadata:
@ -216,3 +216,65 @@ spec:
If you access the pod you can check that your data is avaialable at
`/var/lib/www/html`
## Testing Raw Block feature in kubernetes with RBD volumes
CSI block volume support is feature-gated and turned off by default. To run CSI
with block volume support enabled, a cluster administrator must enable the
feature for each Kubernetes component using the following feature gate flags:
--feature-gates=BlockVolume=true,CSIBlockVolume=true
these feature-gates must be enabled on both api-server and kubelet
### create a raw-block PVC
```yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: raw-block-pvc
spec:
accessModes:
- ReadWriteOnce
volumeMode: Block
resources:
requests:
storage: 1Gi
storageClassName: csi-rbd
```
create raw block pvc
```console
kubectl create -f raw-block-pvc.yaml
```
### create a pod to mount raw-block PVC
```yaml
---
apiVersion: v1
kind: Pod
metadata:
name: pod-with-raw-block-volume
spec:
containers:
- name: fc-container
image: fedora:26
command: ["/bin/sh", "-c"]
args: [ "tail -f /dev/null" ]
volumeDevices:
- name: data
devicePath: /dev/xvda
volumes:
- name: data
persistentVolumeClaim:
claimName: raw-block-pvc
```
Create a POD that uses raw block PVC
```console
kubectl create -f raw-block-pod.yaml
```

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@ -0,0 +1,18 @@
---
apiVersion: v1
kind: Pod
metadata:
name: pod-with-raw-block-volume
spec:
containers:
- name: fc-container
image: fedora:26
command: ["/bin/sh", "-c"]
args: ["tail -f /dev/null"]
volumeDevices:
- name: data
devicePath: /dev/xvda
volumes:
- name: data
persistentVolumeClaim:
claimName: raw-block-pvc

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@ -0,0 +1,13 @@
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: raw-block-pvc
spec:
accessModes:
- ReadWriteOnce
volumeMode: Block
resources:
requests:
storage: 1Gi
storageClassName: csi-rbd