My knowledge and understanding of DNS is limited and spotty. So, perhaps what I am asking is merely impossible.
My client has existing shared hosting with several domain names. The one in question has some traffic already on the TLD.
I built a Rails app on Heroku. The shared hosting does not support Ruby-on-Rails
I need to redirect requests to a subdomain (in the client's shared hosting) to the Heroku app (something.herokuapp.com). Heroku's documentation indicates I cannot point to an IP address. It must be a CNAME record.
I am not really sure how/if/when/where this can be accomplished.
Thanks, in advance, for an advice and additionally for any edification on how this stuff with MX, A, CNAME stuff all interacts.