This Github repository contains an example of deploying Rails application with Capistrano 3 including features:

– copy config files to shared folder

– linked files and dirs

– precompile assets locally

– precompile assets only if files were changed

– restart app in Passenger

– show a maintenance page on site while the site is updating

Find it on Github: https://github.com/maxivak/deploy-rails-capistrano3. Download the files from the repository and use the tasks according to your requirements.