App Runner Custom domain adding methods

Question

When linking a custom domain to my App runner instance, the domain verification asks for a CNAME setup with a 60+ chars long host value, which our registrar (Namecheap) cannot handle (max. 60 chars allowed).
Is there a way of shortening the verification host value length or to link a custom domain to the service in another way?

Joe · Accepted Answer

Hi Paweł,

Many thanks for the answer and sorry for being late with my reply. I've worked this around already:
1. I've set up a new NS pointing to Route 53 for my subdomain which I wanted to make available for my App runner - this made the subdomain being able to be managed from Route 53
2. I've associated the subdomain with my App runner using Route 53, which was ofc able to handle the long CNAMEs

Regards,
Joe

Pawel · Answer

Hi Joe,

Since domain validation is done by ACM, unfortunately it is not possible to shorten the CNAME value. The only thing allowed is to remove "_" sign from it - please see https://docs.aws.amazon.com/acm/latest/userguide/troubleshooting-DNS-validation.html

As a workaround you can move this particular domain to another registrar (i.e. Route53) who allows longer CNAME values.

Best,

Paweł

App Runner Custom domain adding methods

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