Deploying Secure Azure File Shares: Premium Performance and Network Security

Source: Dev.to

Introduction

Azure Files provides fully managed file shares in the cloud that are accessible via the industry‑standard SMB and NFS protocols. For departments like Finance, balancing high performance with strict network security is critical. This guide walks through:

• Deploying a Premium Azure File share
• Protecting data with snapshots
• Restricting access to a specific Virtual Network for enterprise‑grade security

Learn more about storage accounts for Azure Files deployments

Create the storage account

1. In the Azure portal, search for Storage accounts and select + Create.
2. Resource group – click Create new, give it a name, and click OK.
3. Storage account name – provide a name that meets Azure naming requirements.
4. Performance – set to Premium.
5. Account kind – choose FileStorage (Premium file shares).
6. Redundancy – select Zone‑redundant storage (ZRS).
7. Click Review + create, then Create.
8. After deployment completes, select Go to resource.

Create and configure a file share with directory

1. In the newly created storage account, go to Data storage → File shares.
2. Click + File share, give it a name (e.g., finance-share), keep the default options, and click Create.
3. Open the file share and select + Add directory.
   • Name the directory finance.
   • Click Browse and choose the finance directory to confirm.
4. (Optional) Upload a test file to the finance directory to verify write access.

Configure and test snapshots

1. Select the file share, then in the Operations section choose Snapshots.
2. Click + Add snapshot (the comment field is optional) and confirm with OK.
3. Verify that the snapshot includes the finance directory and the uploaded file.

Restoring a file from a snapshot

1. In the file share, navigate to the finance directory.
2. Delete the test file (Properties → Delete → Yes).
3. Return to Snapshots, select the previously created snapshot.
4. Browse to the deleted file, select it, and click Restore.
5. Provide a name for the restored file and confirm.
6. Verify that the file reappears in the finance directory.

Restrict access to a virtual network

These steps assume a virtual network with a subnet already exists. If not, create one as described below.

Create a virtual network (if needed)

1. Search for Virtual networks and select + Create.
2. Choose the same resource group as the storage account, give the VNet a name, and accept the default address space.
3. Click Review + create → Create, then Go to resource after deployment.
4. In Settings → Subnets, select the default subnet.
5. Under Service endpoints, add Microsoft.Storage and save the changes.

Configure private access for the storage account

1. Return to the storage account and open Networking under Security + networking.
2. Set Public network access to Enabled from selected virtual networks and IP addresses.
3. In the Virtual networks section, click Add existing virtual network, select the VNet and subnet created earlier, and click Add.
4. Save the changes.

Verify network restriction

1. Open the Storage browser and attempt to navigate to the file share from a client outside the configured virtual network.
2. You should receive an “not authorized to perform this operation” message, confirming that access is limited to the specified VNet.

Conclusion

By following these steps you have:

• Deployed a high‑performance, resilient Premium File Share with Zone‑redundant storage (ZRS).
• Implemented snapshots to protect against accidental deletions.
• Restricted storage access to a specific Virtual Network using service endpoints, dramatically reducing the attack surface for sensitive financial data.

This layered approach aligns with Azure best practices for security and availability when managing departmental data.