Azure Blob Storage CSI driver for Kubernetes

About

This driver allows Kubernetes to access Azure Storage through one of following methods:

• azure-storage-fuse
• NFSv3

Disclaimer: Deploying this driver manually is not an officially supported Microsoft product. For a fully managed and supported experience on Kubernetes, use AKS with the managed blob csi driver.

csi plugin name: blob.csi.azure.com

Project status: GA

Container Images & Kubernetes Compatibility:

driver version	Image	supported k8s version
master branch	mcr.microsoft.com/k8s/csi/blob-csi:latest	1.21+
v1.25.0	mcr.microsoft.com/oss/kubernetes-csi/blob-csi:v1.25.0	1.21+
v1.24.5	mcr.microsoft.com/oss/kubernetes-csi/blob-csi:v1.24.5	1.21+
v1.23.9	mcr.microsoft.com/oss/kubernetes-csi/blob-csi:v1.23.9	1.21+
v1.22.9	mcr.microsoft.com/oss/kubernetes-csi/blob-csi:v1.22.9	1.21+

Driver parameters

Please refer to blob.csi.azure.com driver parameters

Prerequisites

Option#1: Provide cloud provider config with Azure credentials

• This option depends on cloud provider config file (here is config example), config file path on different clusters:
  • AKS, capz, aks-engine: /etc/kubernetes/azure.json
  • Azure RedHat OpenShift: /etc/kubernetes/cloud.conf
• specify a different config file path via configmap

  
  create configmap "azure-cred-file" before driver starts up
  

  kubectl create configmap azure-cred-file --from-literal=path="/etc/kubernetes/cloud.conf" --from-literal=path-windows="C:\\k\\cloud.conf" -n kube-system

• Cloud provider config can also be specified via kubernetes secret, check details here
• Make sure identity used by driver has Contributor role on node resource group and virtual network resource group

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. Refer to detailed steps.

Install driver on a Kubernetes cluster

Note: this feature is only available in v1.19.5, v1.21.1 and later versions.

Execute following command to install a specific version of blobfuse v2 once driver is running on the agent node:

kubectl patch daemonset csi-blob-node -n kube-system -p '{"spec":{"template":{"spec":{"initContainers":[{"env":[{"name":"INSTALL_BLOBFUSE2","value":"true"},{"name":"BLOBFUSE2_VERSION","value":"2.4.0"}],"name":"install-blobfuse-proxy"}]}}}}'

Execute following command to install a specific version of blobfuse v1 once driver is running on the agent node:

kubectl patch daemonset csi-blob-node -n kube-system -p '{"spec":{"template":{"spec":{"initContainers":[{"env":[{"name":"INSTALL_BLOBFUSE","value":"true"},{"name":"BLOBFUSE_VERSION","value":"1.4.5"}],"name":"install-blobfuse-proxy"}]}}}}'

• install by helm charts
• install by kubectl
• install open source CSI driver on following platforms:
  • AKS
  • Azure RedHat OpenShift
• install managed CSI driver on following platforms:
  • AKS

Examples

• Basic usage

Usage

• NFSv3
• fsGroupPolicy
• Volume cloning
• Workload identity
• Mount Azure blob storage with managed identity

Troubleshooting

• CSI driver troubleshooting guide

Support

• Please see our support policy

Limitations

• Please refer to Azure Blob Storage CSI Driver Limitations

Kubernetes Development

• Please refer to development guide

View CI Results

• Check testgrid provider-azure-blobfuse-csi-driver dashboard.

Links

• azure-storage-fuse
• Kubernetes CSI Documentation
• CSI Drivers
• Container Storage Interface (CSI) Specification
• Blobfuse2 Known issues