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Showing content from https://learn.microsoft.com/en-us/azure-stack/aks-hci/container-storage-interface-files below:

Use Container Storage Interface (CSI) file drivers in AKS enabled by Azure Arc - AKS enabled by Azure Arc

> Applies to: AKS on Windows Server, AKS on Azure Local

This article describes how to use Container Storage Interface (CSI) drivers for files to mount a Server Message Block (SMB) or NFS shares when multiple nodes need concurrent access to the same storage volume in AKS enabled by Azure Arc.

The Container Storage Interface (CSI) is a standard for exposing arbitrary block and file storage systems to containerized workloads on Kubernetes. By using CSI, AKS enabled by Arc can write, deploy, and iterate plug-ins to expose new storage systems. CSI can also improve existing ones in Kubernetes without having to touch the core Kubernetes code and then wait for its release cycles.

The disk and file CSI drivers used by AKS Arc are CSI specification-compliant drivers.

The CSI storage driver support on AKS Arc allows you to use:

• AKS Arc disks that you can use to create a Kubernetes DataDisk resource. These are mounted as ReadWriteOnce, so they're only available to a single pod at a time. For storage volumes that can be accessed by multiple pods simultaneously, use AKS Arc files.

• AKS Arc files that you can use to mount an SMB or NFS share to pods. These are mounted as ReadWriteMany, so you can share data across multiple nodes and pods. They can also be mounted as ReadWriteOnce based on the PVC (persistent volume claim) specification.

If multiple nodes need concurrent access to the same storage volumes in AKS Arc, you can use CSI drivers for files to mount SMB or NFS shares as ReadWriteMany. You must provision the SMB or NFS shares in advance.

• AKS on Azure Local
• AKS on Windows Server

1. Make sure the SMB driver is deployed. The SMB CSI driver is installed by default when you create a Kubernetes cluster using the az aksarc create command. If you create the AKS cluster using the Azure portal, an Azure Resource Manager (ARM) template, or Terraform, the SMB CSI driver is not installed by default. You must enable the SMB driver on the AKS cluster. The equivalent Azure CLI command to update an existing AKS cluster and enable SMB is:

   az aksarc update -n $aksclustername -g $resource_group --enable-smb-driver
   

1. Make sure the SMB driver is deployed. Deploy the driver using the following Install-AksHciCsiSmb PowerShell command:

   Install-AksHciCsiSmb -clusterName mycluster
   

1. Create Kubernetes secrets to store the credentials required to access SMB shares by running the following command:

   kubectl create secret generic smbcreds --from-literal username=$username --from-literal password=$password --from-literal domain=$domain
   

2. Create a storage class using kubectl to create a new SMB storage class with the following manifest:

   apiVersion: storage.k8s.io/v1
   kind: StorageClass
   metadata:
     name: smb-csi
   provisioner: smb.csi.akshci.com
   parameters:
      source: \\smb-server\share
      csi.storage.k8s.io/node-stage-secret-name: "smbcreds"
      csi.storage.k8s.io/node-stage-secret-namespace: "default"
   reclaimPolicy: Retain  # only Retain is supported
   volumeBindingMode: Immediate
   mountOptions:
     - dir_mode=0777
     - file_mode=0777
     - uid=1001
     - gid=1001
   

• AKS on Azure Local
• AKS on Windows Server

1. Make sure the SMB driver is deployed. The SMB CSI driver is installed by default when you create a Kubernetes cluster using the az aksarc create command. If you create the AKS cluster using the Azure portal, an Azure Resource Manager (ARM) template, or Terraform, the SMB CSI driver is not installed by default. You must enable the SMB driver on the AKS cluster. The equivalent Azure CLI command to update an existing AKS cluster and enable SMB is:

   az aksarc update -n $aksclustername -g $resource_group --enable-nfs-driver
   

1. Deploy the driver using the following Install-AksHciCsiSmb PowerShell command:

   Install-AksHciCsiNfs -clusterName mycluster
   

1. Create an NFS storage class using the following manifest:

   apiVersion: storage.k8s.io/v1
   kind: StorageClass
   metadata:
     name: nfs-csi
   provisioner: nfs.csi.akshci.com
   parameters:
     server: nfs-server.default.svc.cluster.local # NFS server endpoint
     share: / # NFS share path
   reclaimPolicy: Retain
   volumeBindingMode: Immediate
   mountOptions:
     - hard
     - nfsvers=4.1
   

• AKS on Azure Local
• AKS on Windows Server

Use the following Azure CLI commands to uninstall either the SMB or NFS drivers:

az aksarc update -n $aksclustername -g $resource_group --disable-smb-driver
az aksarc update -n $aksclustername -g $resource_group --disable-nfs-driver

Use the following PowerShell commands to uninstall either the SMB or NFS drivers:

Uninstall-AksHciCsiSMB -clusterName <clustername>
Uninstall-AksHciCsiNFS -clusterName <clustername>

• Use the disk Container Storage Interface drivers

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