DNS Domain Name length considerations

Overview

The AWS Route53 documentation provides some guidance on length constraints when it comes to domain names.

Domain Label length

Each domain label (that is, each dot-separated text component of a domain name) may be no more than 63 characters in length. However, Cloud Platform’s DNS component currently prepends some Route53 records with an additional string of 6 characters.

This means that, for the time being, we have implemented a Kubernetes-level policy which will not permit the creation of an Ingress object whose hostname fields contain domain labels of length greater than 57 characters.

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