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CSI driver example

refer to driver parameters for more detailed usage

Dynamic Provisioning

Option#1: create storage account by CSI driver

  • Create storage class
kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/storageclass-blobfuse.yaml

Option#2: bring your own storage account

This option does not depend on cloud provider config file, supports cross subscription and on-premise cluster scenario.

  • Use kubectl create secret to create azure-secret with existing storage account name and key
kubectl create secret generic azure-secret --from-literal azurestorageaccountname=NAME --from-literal azurestorageaccountkey="KEY" --type=Opaque
  • create storage class referencing azure-secret
kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/storageclass-blob-secret.yaml

Create application

  • Create a statefulset with volume mount
kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/statefulset.yaml
  • Execute df -h command in the container
kubectl exec -it statefulset-blob-0 -- df -h
Filesystem      Size  Used Avail Use% Mounted on
...
blobfuse         14G   41M   13G   1% /mnt/blob
...

Static Provisioning(use an existing storage account)

Option#1: Use storage class

make sure cluster identity could access storage account

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: blob-fuse
provisioner: blob.csi.azure.com
parameters:
  resourceGroup: EXISTING_RESOURCE_GROUP_NAME
  storageAccount: EXISTING_STORAGE_ACCOUNT_NAME  # cross subscription is not supported
  containerName: EXISTING_CONTAINER_NAME
reclaimPolicy: Retain  # If set as "Delete" container would be removed after pvc deletion
volumeBindingMode: Immediate
  • Create storage class and PVC
kubectl create -f storageclass-blobfuse-existing-container.yaml
kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/pvc-blob-csi.yaml

Option#2: Use secret

  • Use kubectl create secret to create azure-secret with existing storage account name and key(or sastoken)
kubectl create secret generic azure-secret --from-literal azurestorageaccountname=NAME --from-literal azurestorageaccountkey="KEY" --type=Opaque

or create azure-secret with existing storage account name and sastoken:

kubectl create secret generic azure-secret --from-literal azurestorageaccountname=NAME --from-literal azurestorageaccountsastoken
="sastoken" --type=Opaque

storage account key(or sastoken) could also be stored in Azure Key Vault, check example here: read-from-keyvault

apiVersion: v1
kind: PersistentVolume
metadata:
  annotations:
    pv.kubernetes.io/provisioned-by: blob.csi.azure.com
  name: pv-blob
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: blob.csi.azure.com
    # make sure volumeid is unique for every storage blob container in the cluster
    volumeHandle: account-name_container-name
    volumeAttributes:
      containerName: EXISTING_CONTAINER_NAME
    nodeStageSecretRef:
      name: azure-secret
      namespace: default
  • Create PV and PVC
kubectl create -f pv-blobfuse-csi.yaml
kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/pvc-blob-csi-static.yaml
  • make sure pvc is created and in Bound status after a while
kubectl describe pvc pvc-blob

create a pod with PVC mount

kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/nginx-pod-blob.yaml
  • Execute df -h command in the container
kubectl exec -it nginx-blob -- df -h
Filesystem      Size  Used Avail Use% Mounted on
...
blobfuse         14G   41M   13G   1% /mnt/blob
...

In the above example, there is a /mnt/blob directory mounted as blobfuse filesystem.

Option#3: Inline volume

  • inline volume does not support nfs protocol
  • to avoid performance issue, use persistent volume instead of inline volume when numerous pods are accessing the same volume
  • secretNamespace parameter is not required since the secret must be in the same namespace as pod
  • in below blobfuse mount example, create azure-secret with existing storage account name and key in the same namespace as pod, both secret and pod are in default namespace
kubectl create secret generic azure-secret --from-literal azurestorageaccountname=NAME --from-literal azurestorageaccountkey="KEY" --type=Opaque
  • download nginx-pod-azurefile-inline-volume.yaml file and edit containerName, secretName
wget https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/nginx-blobfuse-inline-volume.yaml
#edit nginx-blobfuse-inline-volume.yaml
kubectl create -f nginx-blobfuse-inline-volume.yaml