I’m using the acme-client gem for Ruby on Rails to generate certificates for my domain, nearcut.com. I have may other domains pointing to mine as the rails app will look at the domain making the request and return the correct data.
I have successfully used the gem to create a certificate with Lets Encrypt and for test purposes added 1 other domain that points to our server. I notice that when viewing the certificate in Chrome, the other domain is included under “Subject Alternative Name ( 22.214.171.124 )”.
What I want to know is if there is a limit to the number of SANs on this single certificate and if so, how can I work around it. We expect our system to server a significant number of different domains in the coming months and are aiming to have Let’s Encrypt be our CA.