Managing multiple Azure resources with custom domains can quickly become messy. Instead of creating separate CNAME records for each service, Azure Front Door offers a cleaner, more centralized approach. In this post, I’ll walk you through setting up Azure Front Door to manage multiple custom domains from a single endpoint. What We’re Building I recently set up a demo environment that showcases how Azure Front Door can streamline domain management. Here’s what I created: Azure Resources (Resource Group: “fd-demo”): Azure Resources (Resource Group: “fd-demo”): API Management: example-apim-1
Web App Service: web-app-1
Function App: fn-app
Front Door: house-door API Management: example-apim-1 example-apim-1 Web App Service: web-app-1 web-app-1 Function App: fn-app fn-app Front Door: house-door house-door Custom Domains: Custom Domains: gateway.somedns.xyz → API Management
web.somedns.xyz → Web App Service
function.somedns.xyz → Function App gateway.somedns.xyz → API Management gateway.somedns.xyz web.somedns.xyz → Web App Service web.somedns.xyz function.somedns.xyz → Function App function.somedns.xyz Step 1: Add Custom Domains to Front Door First, I added all my custom domains in the Front Door’s Domains section: Domains gateway.somedns.xyz
web.somedns.xyz
function.somedns.xyz gateway.somedns.xyz gateway.somedns.xyz web.somedns.xyz web.somedns.xyz function.somedns.xyz function.somedns.xyz At this point, these domains are added but not yet validated or routed. Step 2: Create Origin Groups Next, I set up Origin Groups to define where traffic should go: Origin Groups “gateway-origin” → Added the API Management service (example-apim-1) as the origin
“web-origin” → Added the Web App Service (web-app-1) as the origin
“function-origin” → Added the Function App (fn-app) as the origin “gateway-origin” → Added the API Management service (example-apim-1) as the origin “gateway-origin” example-apim-1 “web-origin” → Added the Web App Service (web-app-1) as the origin “web-origin” web-app-1 “function-origin” → Added the Function App (fn-app) as the origin “function-origin” fn-app Think of origin groups as containers that hold your actual Azure resources. Step 3: Configure Routes In the Front Door Manager section, under my main Front Door endpoint (house-door-chfpb7buavcdaafp.a01.azurefd.net), I created routes to connect domains with their respective origin groups: Front Door Manager house-door-chfpb7buavcdaafp.a01.azurefd.net “gateway-route” → gateway.somedns.xyz → gateway-origin
“web-route” → web.somedns.xyz → web-origin
“backend-route” → function.somedns.xyz → function-origin “gateway-route” → gateway.somedns.xyz → gateway-origin “gateway-route” gateway.somedns.xyz “web-route” → web.somedns.xyz → web-origin “web-route” web.somedns.xyz “backend-route” → function.somedns.xyz → function-origin “backend-route” function.somedns.xyz Now Azure knows which domain should route to which service.Note: you can add more endpoints other than the default one and then add your routes. Step 4: Update DNS Records Here’s where the magic happens. Instead of creating separate CNAME records for each Azure service, I only needed to add one CNAME record in my domain registrar (Porkbun): one gateway.somedns.xyz    CNAME    house-door-chfpb7buavcdaafp.a01.azurefd.net 
web.somedns.xyz        CNAME    house-door-chfpb7buavcdaafp.a01.azurefd.net 
function.somedns.xyz   CNAME    house-door-chfpb7buavcdaafp.a01.azurefd.net gateway.somedns.xyz    CNAME    house-door-chfpb7buavcdaafp.a01.azurefd.net 
web.somedns.xyz        CNAME    house-door-chfpb7buavcdaafp.a01.azurefd.net 
function.somedns.xyz   CNAME    house-door-chfpb7buavcdaafp.a01.azurefd.net Pro tip: You can verify DNS propagation using dnschecker.org to make sure your records are live worldwide. Pro tip: dnschecker.org Step 5: Domain Validation with TXT Records Back in Azure, each domain will show a “Pending” validation status. For each domain: Click the validation link
Copy the Azure-generated TXT record
Add it to your domain registrar
Wait 5-60 minutes for validation to complete Click the validation link Copy the Azure-generated TXT record Add it to your domain registrar Wait 5-60 minutes for validation to complete The TXT records look something like: _dnsauth.gateway.somedns.xyz    TXT    "generated-validation-string" Here is an example of how the records should look like in your domain registrar: Step 6: Test Your Setup Once validation is complete, all pending domains should be approved and all routes verified: test each URL: https://gateway.somedns.xyz → Should hit your API Management
https://web.somedns.xyz → Should hit your Web App Service
https://function.somedns.xyz → Should hit your Function App https://gateway.somedns.xyz → Should hit your API Management https://gateway.somedns.xyz https://web.somedns.xyz → Should hit your Web App Service https://web.somedns.xyz https://function.somedns.xyz → Should hit your Function App https://function.somedns.xyz Why This Approach: Before Front Door: Before Front Door: Separate CNAME records for each Azure service
Multiple SSL certificates to manage
Limited traffic control and routing options
Harder to implement global rules Separate CNAME records for each Azure service Multiple SSL certificates to manage Limited traffic control and routing options Harder to implement global rules With Front Door: With Front Door: Single CNAME endpoint for all domains
Centralized SSL certificate management
Advanced routing, caching, and security rules
Better performance with global edge locations
Cleaner DNS management Single CNAME endpoint for all domains Centralized SSL certificate management Advanced routing, caching, and security rules Better performance with global edge locations Cleaner DNS management Conclusion Azure Front Door transforms domain management from a scattered approach to a centralized one. Instead of juggling multiple DNS records and configurations, you get a single point of control for all your domains and traffic routing. This setup gives you a solid foundation for adding more advanced features like custom routing rules, caching policies, and security configurations—all managed from one place.

Porkbun

Simplifying Domain Management with Azure Front Door: A Step-by-Step Guide

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