What is Service Endpoint in Azure: Simple Explanation and Example

A service endpoint in Azure allows secure and direct connectivity from a virtual network to Azure services over the Azure backbone network. It extends your virtual network's private address space to the Azure service, improving security and performance by avoiding public internet traffic.

How It Works

Imagine your virtual network as a private neighborhood and Azure services as stores outside the neighborhood. Normally, to visit these stores, you must go through public roads (the internet), which can be slow and less secure. A service endpoint acts like a private tunnel or dedicated road that connects your neighborhood directly to these stores without using public roads.

This connection uses Azure's internal network, so your data stays private and travels faster. The service endpoint extends your virtual network's private IP addresses to the Azure service, making it appear as if the service is inside your network. This setup helps control access and improves security by limiting exposure to the public internet.

Example

This example shows how to enable a service endpoint for Azure Storage on a virtual network subnet using Azure CLI.

bash

az network vnet subnet update \
  --resource-group MyResourceGroup \
  --vnet-name MyVNet \
  --name MySubnet \
  --service-endpoints Microsoft.Storage

Output

{
  "addressPrefix": "10.0.0.0/24",
  "delegations": [],
  "etag": "W/\"00000000-0000-0000-0000-000000000000\"",
  "id": "/subscriptions/xxxx/resourceGroups/MyResourceGroup/providers/Microsoft.Network/virtualNetworks/MyVNet/subnets/MySubnet",
  "name": "MySubnet",
  "privateEndpointNetworkPolicies": "Enabled",
  "privateLinkServiceNetworkPolicies": "Enabled",
  "provisioningState": "Succeeded",
  "resourceGroup": "MyResourceGroup",
  "serviceEndpoints": [
    {
      "service": "Microsoft.Storage",
      "locations": [
        "eastus"
      ]
    }
  ]
}

When to Use

Use service endpoints when you want to securely connect your virtual network to Azure services like Storage, SQL Database, or Cosmos DB without exposing traffic to the public internet. This is helpful when you need better security, lower latency, and simplified network architecture.

For example, if you run an application inside a virtual network that needs to access Azure Storage, enabling a service endpoint ensures the data flows privately and securely. It also helps enforce network rules that restrict access only to your virtual network.

Key Points

• Service endpoints provide private, direct connectivity to Azure services from a virtual network.
• They improve security by avoiding public internet exposure.
• Service endpoints extend your virtual network's IP space to the Azure service.
• They are easy to enable on subnets and support many Azure services.
• Use them to simplify network security and improve performance.

Key Takeaways

Service endpoints connect your virtual network privately to Azure services over Azure's backbone network.

They improve security by keeping traffic off the public internet.

Enable service endpoints on subnets to restrict Azure service access to your virtual network.

Service endpoints reduce latency and simplify network management.

They support many Azure services like Storage, SQL Database, and Cosmos DB.