In this article, we explore the concept of a private endpoint for an Azure Storage account. Unlike service endpoints—which allow access to Azure services over the Azure backbone network while still using public endpoints—Azure Private Link uses private endpoints to provide direct, secure connectivity using an IP address from your Virtual Network (VNet). When using service endpoints, the source IP (for instance, that of your Virtual Machine or VM) remains unchanged, but the connection still terminates at a public endpoint. Although the traffic remains within the Azure backbone, this setup may not meet strict security requirements for a fully private network. Service endpoints are limited to Azure VNets; they do not extend to on-premises networks. When you add your on-premises IP to the storage firewall, traffic traverses the public internet, which often does not satisfy high-security standards. Azure Private Link resolves these limitations. By creating a private endpoint for your storage account, the service appears within your VNet. In effect, the storage service receives a network interface from your VNet’s address space, resulting in a connection established through a private IP address. You can deploy the private endpoint in the same VNet as your VM or in another VNet connected through peering, making the storage account accessible as a local resource rather than a public one.Documentation Index
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Benefits of Azure Private Endpoint
- Private Connection to Azure Services: Each supported PaaS solution receives a private IP address from your VNet.
- Seamless Integration for On-Premises and Inter-VNet Connectivity: On-premises networks can resolve service names to private IP addresses using VPN or ExpressRoute connections, thereby avoiding public internet routing.
- Enhanced Data Exfiltration Protection: Keeping traffic within a private network mitigates the chance of unauthorized data exposure.
- Direct Access within Azure VNets: Services become directly available via private IP addresses without the need for additional network configurations.
Disabling public network access will render any previously configured service endpoints non-functional. Attempting to access the storage account via a VM without the proper configuration will result in an “Authorization Failure” error.
Configuring a Private Endpoint in the Azure Portal
To configure a private endpoint for your storage account, follow these steps:- In the Azure portal, navigate to the Private Endpoint section.
- Create a new private endpoint by entering a name (for example, “PE Storage”). This action automatically creates a network interface linking the private endpoint to your storage account.
- Under resource selection, choose Storage and opt for the Blob endpoint if you store files in Blob storage.
- Select the appropriate Virtual Network and subnet. To simplify, you can choose the same subnet where your VM resides; however, the private endpoint can reside in a different subnet or even in a VNet that is connected via peering.
- The private endpoint (sometimes abbreviated as “pe”) along with an associated private link resource.
- DNS configurations mapping the storage account name to its private IP address.
Testing Private Endpoint Connectivity
After deploying the private endpoint, you must verify that the storage account resolves to a private IP address. On your VM, use the following command to inspect DNS resolution:Summary
Azure Private Endpoints offer a secure method for accessing storage accounts and other Azure services over a private connection using an IP from your Virtual Network. The seamless integration with Azure Private DNS Zones allows service names to resolve accurately to private IP addresses, simplifying connectivity for both Azure VMs and on-premises systems (when DNS forwarders are configured). This configuration improves your security posture by eliminating exposure to the public internet and reducing the risk of data exfiltration.In the next module, we will explore techniques for managing and administering network traffic within your Azure environment.