What an earnest post, and how damn refreshing it is to see such concern for users, accountability, honesty and openness (quite a contrast to another PaaS)! I moved one app successfully from heroku to fly and attempted to move a few others. These are my experiences (both good and bad): Great: - The load time on the pages is insanely faster on fly than heroku. Sometimes I thought I was on the localhost version of the a…
The issues you ran into with older versions of Rails was probably because the Dockerfile that `fly launch` generated was for new versions of Rails. We switched to https://github.com/rubys/dockerfile-rails to streamline Dockerfile generation and support older versions of Rails.
If you try it again and run into issues you can open an issue at https://github.com/rubys/dockerfile-rails/issues or post in https://community.fly.io and somebody will help get that sorted out.
The more versions of Rails we can deploy the better!