Using azure privatelink with frontdoor

Question

Pulumi · Accepted Answer

To integrate Azure PrivateLink with Azure Front Door, you'll need to create a few different resources:

1. **Azure Front Door**: It acts as a scalable and secure entry point for fast delivery of your global web applications. Front Door provides various routing methods and backend health monitoring options.
   
2. **FrontdoorEndpoint**: Represents a Front Door endpoint, which is the location where Front Door exposes your application to the Internet.
   
3. **FrontdoorOrigin**: This represents a backend in the Front Door environment, which can be any hostname. The origin contains the address of the content, such as an Azure storage account or an external website.
   
4. **AFDOrigin with Private Link**: When you create an AFDOrigin (Azure Front Door Origin), you can set up Azure Private Link by configuring the `privateLink` property. This ensures that the traffic to the origin is secured and uses Azure’s private network.

5. **FrontdoorRoute**: Configures the routes for the incoming traffic based on patterns and rules that you specify for the backend hosts.

The following TypeScript program using Pulumi creates an Azure Front Door, an AFDOrigin with Azure PrivateLink enabled, and sets up a basic route for incoming traffic:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as azure_native from "@pulumi/azure-native";

// Create an Azure resource group if you don't have one already
const resourceGroup = new azure_native.resources.ResourceGroup("my-resource-group");

// Create a Front Door
const frontDoor = new azure_native.network.FrontDoor("myFrontDoor", {
    resourceGroupName: resourceGroup.name,
    location: "Global", // Front Door is a global service and requires the "Global" location
    frontendEndpoints: [{
        name: "frontendEndpoint1",
        properties: {
            hostName: "myfrontdoor.azurefd.net", // The host name for the Front Door service, it should be globally unique
        },
    }],
    backendPools: [{
        name: "backendPool1",
        properties: {
            backends: [{
                address: "myorigin1.azurewebsites.net", // The FQDN of your backend service
                httpPort: 80,
                httpsPort: 443,
                priority: 1,
                weight: 50,
                // Include the private link configuration below when using Azure Private Link
                privateLinkResourceId: "/subscriptions/{subscription-id}/resourceGroups/{resource-group}/providers/Microsoft.Network/privateLinkServices/{my-private-link-service}", // Replace with the correct Private Link resource ID
                privateLinkLocation: "eastus", // Replace with the appropriate location
                privateLinkApprovalMessage: "Please approve my connection.",
            }],
            loadBalancingSettings: {
                additionalLatencyMilliseconds: 0,
                sampleSize: 4,
                successfulSamplesRequired: 2,
            },
            healthProbeSettings: {
                intervalInSeconds: 120,
                path: "/healthz", // A health probe path that the Front Door will ping to check backend health
                protocol: "Http", // Replace with "Https" if your backend service uses HTTPS
            },
        },
    }],
    // Define routing rules for your Front Door service
    routingRules: [{
        name: "routingRule1",
        properties: {
            frontendEndpoints: [
                { id: frontDoor.frontendEndpoints[0].id }, // Associate with the first frontend endpoint
            ],
            acceptedProtocols: ["Http", "Https"],
            patternsToMatch: ["/path/*"], // Specify the URL pattern that will match this rule
            routeConfiguration: {
                // Define the behavior for matched traffic, such as redirection or forwarding to specific backends
                // Replace with your specific route settings
            },
            enabledState: "Enabled",
        },
    }],
    // Enable WAF (Web Application Firewall) as needed for security
    // wafPolicy: {...},
});

// Export the endpoint URL of the Front Door
export const frontDoorUrl = pulumi.interpolate`https://${frontDoor.frontendEndpoints[0].properties.hostName}`;

```

In the above program:

- We create an Azure Resource Group which will contain all our resources.
- Then, we set up a `FrontDoor` service with a `frontendEndpoint`, a `backendPool`, and a `routingRule`. 
- The backend pool's `backends` property includes `privateLinkResourceId`, `privateLinkLocation`, and `privateLinkApprovalMessage`, which are necessary to configure the Private Link.
- Finally, we export the URL of the Front Door which can be used to access your application once the deployment is complete.

Be sure to replace placeholders such as `{subscription-id}`, `{resource-group}`, `{my-private-link-service}`, and the backend service details with actual values from your Azure environment.

Remember to review and configure `routeConfiguration` within the `routingRules` based on the specific needs of your application, such as setting up forwarding or redirect configurations.

Ensure you have the Pulumi CLI installed and configured for use with your Azure subscription. Once the program is ready, run `pulumi up` to deploy your infrastructure.