How to deploy rails 5 app with capistrano

1. Add capistrano gems to Gemfile 

group :development do
  gem 'capistrano'
  gem 'capistrano-rails'
  gem 'capistrano-passenger'
  gem 'capistrano-rvm'
end

2. Install and initialize capistrano

cap install

# output
mkdir -p config/deploy
create config/deploy.rb
create config/deploy/staging.rb
create config/deploy/production.rb
mkdir -p lib/capistrano/tasks
create Capfile
Capified

3. un-comment those lines in Capfile 

require "capistrano/rvm"
# require "capistrano/rbenv"
# require "capistrano/chruby"
require "capistrano/bundler"
require "capistrano/rails/assets"
require "capistrano/rails/migrations"
require "capistrano/passenger"

4. modify config/deploy.rb

5. modify config/deploy/production.rb

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