Adding Custom Domain and SSL to Azure Container Instances with Application Gateway
You are deploying a containerized application to Azure Container Instances. The application requires a custom domain name and SSL/TLS termination. You need to configure these features. Which resource should you create alongside the container group?
Quick Answer
The correct choice is Azure Application Gateway, because it provides Layer 7 load balancing with native SSL/TLS termination and custom domain support, allowing you to securely expose your containerized application without directly exposing the Azure Container Instances group. When you add a custom domain to the Application Gateway’s frontend IP and upload an SSL certificate, the gateway terminates HTTPS connections at the edge and forwards traffic to the container group over HTTP, meeting both requirements cleanly. On the AZ-204 exam, this scenario tests your understanding of how to integrate container workloads with Azure networking services—a common trap is choosing Azure Front Door or a simple load balancer, but only Application Gateway offers integrated SSL offloading and custom domain binding for Container Instances. Remember the memory tip: “Gateway guards and terminates”—the Application Gateway is the single entry point that handles certificates and custom domains, while the container group stays internal and HTTP-only.
⚠ Common exam trap
Candidates often confuse Azure Front Door's global SSL termination with the regional, direct SSL termination needed for a single container group, or mistakenly think a DNS zone alone can handle SSL termination.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Application Gateway
Azure Application Gateway provides Layer 7 load balancing with SSL/TLS termination and custom domain support. By associating a custom domain with the Application Gateway's frontend IP and uploading an SSL certificate, you can terminate HTTPS connections at the gateway and forward traffic to the container group over HTTP. This meets the requirement without exposing the container group directly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Azure Front Door
Why it's wrong here
Azure Front Door operates at the edge and expects a publicly reachable origin (or Private Link with Premium); it isn't built to route directly to a container group on a private VNet. Azure Application Gateway deploys inside the VNet and can reach the container group's private IP directly, which is what allows it to expose the application without the container group being publicly reachable.
- ✓
Azure Application Gateway
Why this is correct
Azure Application Gateway can terminate SSL, route traffic based on host names, and assign a custom domain to the container group.
- ✗
Azure Container Registry
Why it's wrong here
Azure Container Registry stores container images; it does not provide custom domain or SSL termination for running containers.
- ✗
Azure DNS zone
Why it's wrong here
Azure DNS zone only manages DNS records; it does not terminate SSL or route traffic to containers.
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Same concept, more angles
1 more way this is tested on AZ-204
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Variation 1. You are deploying a containerized application to Azure Container Instances. The application requires a custom domain name and SSL/TLS certificate. What should you do?
easy- ✓ A.Place an Azure Application Gateway in front of the container group.
- B.Configure the container to listen on port 443 and map a custom domain.
- C.Upload the certificate to the container and configure the web server.
- D.Use a private endpoint with a custom domain.
Why A: Azure Container Instances (ACI) does not natively support custom domain names or SSL/TLS termination. By placing an Azure Application Gateway in front of the container group, you can offload SSL/TLS termination at the gateway layer, map a custom domain via the gateway's frontend IP, and route traffic to the container group's private IP. This is the recommended pattern for adding HTTPS and custom domains to ACI workloads.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.