
    AWS demonstrates how to serve multiple distinct domains securely using a single Application Load Balancer with Server Name Indication (SNI) and TLS certificates on Amazon EKS, reducing management overhead and cost.


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This article describes how to serve multiple distinct domains with TLS using a single Application Load Balancer (ALB) on Amazon EKS, leveraging AWS Load Balancer Controller and Server Name Indication (SNI).
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<li>Uses AWS Load Balancer Controller to manage a single ALB serving multiple domains</li>
<li>Creates TLS certificates for each domain using AWS Certificate Manager</li>
<li>Deploys three sample applications (rabbit, hamster, chipmunk) with unique domains</li>
<li>Configures host-based routing to direct traffic to correct application using SNI</li>
<li>Creates private Route 53 hosted zones to route domain traffic</li>
<li>Supports up to 25 certificates per ALB</li>
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<p>
The solution reduces management overhead and cost by avoiding the need for a dedicated load balancer for each domain, providing a flexible and efficient approach to multi-domain HTTPS hosting on Kubernetes.
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