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I am currently in the process of migrating my app from Heroku to AWS ECS. I am at the stage where I want to establish a secure connection by enabling https for my app. From what I understand, I need a certificate, which I can obtain using the AWS ACM.

I tried to generate a certificate by providing the currently active production domain name used on my app hosted on Heroku. I purchased this domain name from OVH.

However, the response from AWS was very delayed, and I ultimately found out that my certificate request had failed.

Can you assist me ?

Thank you.

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Firstly, we cannot directly attach a certificate issued from AWS ACM to AWS ECS, one way would be to use AWS ALB in front of the AWS ECS. The AWS ACM-issued certificate can then be attached to AWS ALB.

Secondly, for AWS ACM to issue a certificate the domain needs to be publicly resolvable (resolvable on the internet) and we will have to add a CNAME record to prove the domain ownership (DNS Validation). If these conditions are met, the certificate will be issued by AWS-ACM.

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Thank you for your response. Yes, I expressed myself poorly and I understood the first point you mentioned. For the second point, where should I add the CNAME record to prove domain ownership ? Is it on Route 53 ?
You will have to add the CNAME record where you have the domain hosted. Are you using Route 53 for hosting the domain?
The domain name is hosted on OVH, and I'm not using Route 53. If I understand correctly, I need to add the CNAME record that I see in the certificate details on OVH for AWS to validate my certificate ?
Yes, you are correct.

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