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Merge pull request #247 from Madhu-1/raw-block
update readme for raw-block PVC
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commit
bd8cf1d7f0
@ -128,7 +128,7 @@ Modify your current storage class, or create a new storage class specifically
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for multi node writers by adding the `multiNodeWritable: "enabled"` entry to
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your parameters. Here's an example:
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```
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```yaml
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apiVersion: storage.k8s.io/v1
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kind: StorageClass
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metadata:
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@ -153,7 +153,7 @@ reclaimPolicy: Delete
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Now, you can request Claims from the configured storage class that include
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the `ReadWriteMany` access mode:
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```
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```yaml
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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@ -169,7 +169,7 @@ spec:
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Create a POD that uses this PVC:
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```
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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@ -195,7 +195,7 @@ Now, we can create a second POD (ensure the POD is scheduled on a different
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node; multiwriter single node works without this feature) that also uses this
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PVC at the same time
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```
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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@ -216,3 +216,65 @@ spec:
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If you access the pod you can check that your data is avaialable at
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`/var/lib/www/html`
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## Testing Raw Block feature in kubernetes with RBD volumes
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CSI block volume support is feature-gated and turned off by default. To run CSI
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with block volume support enabled, a cluster administrator must enable the
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feature for each Kubernetes component using the following feature gate flags:
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--feature-gates=BlockVolume=true,CSIBlockVolume=true
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these feature-gates must be enabled on both api-server and kubelet
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### create a raw-block PVC
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```yaml
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: raw-block-pvc
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spec:
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accessModes:
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- ReadWriteOnce
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volumeMode: Block
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resources:
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requests:
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storage: 1Gi
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storageClassName: csi-rbd
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```
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create raw block pvc
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```console
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kubectl create -f raw-block-pvc.yaml
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```
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### create a pod to mount raw-block PVC
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```yaml
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: pod-with-raw-block-volume
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spec:
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containers:
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- name: fc-container
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image: fedora:26
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command: ["/bin/sh", "-c"]
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args: [ "tail -f /dev/null" ]
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volumeDevices:
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- name: data
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devicePath: /dev/xvda
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volumes:
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- name: data
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persistentVolumeClaim:
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claimName: raw-block-pvc
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```
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Create a POD that uses raw block PVC
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```console
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kubectl create -f raw-block-pod.yaml
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```
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18
examples/rbd/raw-block-pod.yaml
Normal file
18
examples/rbd/raw-block-pod.yaml
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@ -0,0 +1,18 @@
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---
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apiVersion: v1
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kind: Pod
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metadata:
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name: pod-with-raw-block-volume
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spec:
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containers:
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- name: fc-container
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image: fedora:26
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command: ["/bin/sh", "-c"]
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args: ["tail -f /dev/null"]
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volumeDevices:
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- name: data
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devicePath: /dev/xvda
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volumes:
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- name: data
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persistentVolumeClaim:
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claimName: raw-block-pvc
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13
examples/rbd/raw-block-pvc.yaml
Normal file
13
examples/rbd/raw-block-pvc.yaml
Normal file
@ -0,0 +1,13 @@
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---
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: raw-block-pvc
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spec:
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accessModes:
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- ReadWriteOnce
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volumeMode: Block
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resources:
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requests:
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storage: 1Gi
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storageClassName: csi-rbd
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