Introduction
In cPanel & WHM version 66, we deprecated the legacy Ruby codebase and plan to remove it in a future release. This legacy Ruby codebase includes Ruby on Rails applications.
Procedure
The following documentation page details how to install Ruby web applications in cPanel & WHM version 66 and later that function on the Phusion Passenger® platform.
https://docs.cpanel.net/knowledge-base/web-services/how-to-create-ruby-web-applications/