I am creating a blogging-like application where we allow our customers to use their own custom domain names such as domainexample.com, so each different domain serves the same application but with different content.
However I am struggling to figure out how to set this up on a production server. If my production server has a static IP then I can surely just set an a-record on each domain to the ip of the production server.
But what if the production server does not have a static IP. For example if we want to host it on heroku or engineyard? I have seen a few solutions online that require using rewrite rules but they require server restarts and cant really dynamically add and remove new domains as new users sign up. Does anyone know any good solutions to let multiple domains hit one rails app?