You have deployed a scalable architecture using an Application Load Balancer (ALB) or a CloudFront distribution. The infrastructure is solid. Now, you simply need to point your root domain (e.g., example.com ) to the AWS resource. You attempt to create a standard CNAME record in Route 53, but the operation fails. Alternatively, if you are using a third-party DNS provider, the record simply refuses to save. This is not a bug in AWS. It is a fundamental constraint of the DNS protocol itself. This guide details why the "Zone Apex" problem exists, how Route 53 Alias records bypass this limitation, and provides the production-ready Terraform code required to implement the solution correctly. The Architectural Constraint: RFC 1034 To understand the solution, you must understand the strict rules governing the Domain Name System (DNS). The issue stems from the original DNS specification, specifically RFC 1034 section 3.6.2 . The Zone Apex Conflict The root of a domain, such ...
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