Q. I want to connect additonal certificates to a domain that is connected to an exisitng ELB. Importing an external certificate from ACM has completed, but is there any effect on the existing certificate when connected?
1. Add certificate
Adding a new certificate is not a problem. There
Adding a new one does not set to be used.
2. Apply certificate
Applying certificate can cause issues.
eg) If you apply the certificate of aaa.co.kr to bbb.co.kr, the two domains are different so the service is not functioning normally.
Therefore, set up the same domain as the certificate on the server.
You can apply the same certificate as the domain you set up to use.
3. Whether to authenticate multiple
Multiple authentication is possible with ALB.
eg) After hosting [com, co.kr] on Amazon Route 53, then provisioning 2 certificates for each domain to AWS Certificate Manager (ACM).
If you run both sites through a single ALB, you can add two.
Possible number of multiple authentication is as same as the target group quantity.
If you have 10 domains, they can be multiple authentication with one certificate.
Reference link : https://aws.amazon.com/ko/blogs/korea/application-load-balancers-now-support-multiple-tls-certificates-with-smart-selection-using-sni/
This document is based on February 2020.
Please leave a comment if document needs an update.
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