Deploy Ruby on Rails API with Capistrano and RVM

Capfile

# Load DSL and set up stages
require 'capistrano/setup'

# Include default deployment tasks
require 'capistrano/deploy'
require 'capistrano/rvm'

# Load custom tasks from `lib/capistrano/tasks' if you have any defined
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

config deploy production.rb

role :app, %w{YOUR-HOST-NAME-OR-IP}
role :web, %w{YOUR-HOST-NAME-OR-IP}
role :db,  %w{YOUR-HOST-NAME-OR-IP}

server 'YOUR-HOST-NAME-OR-IP', user: 'USER-ON-SERVER', roles: %w{web app}

set :ssh_options, {
  keys: %w(~/.ssh/id_rsa),
  forward_agent: true,
  auth_methods: %w(publickey)
}

config deploy.rb

# config valid only for current version of Capistrano
lock '3.4.0'

set :application, 'YOUR APP NAME'
set :branch, :development
set :repo_url, 'git@bitbucket.org:USERNAME/REPO-NAME.git'
set :pty, true

set :default_env, {
  'PATH' => "/home/USER/.rvm/gems/ruby-2.2.0/bin:/home/USER/.rvm/bin:$PATH",
  'RUBY_VERSION' => 'ruby-2.2.0',
  'GEM_HOME'     => '/home/USER/.rvm/gems/ruby-2.2.0',
  'GEM_PATH'     => '/home/USER/.rvm/gems/ruby-2.2.0',
  'BUNDLE_PATH'  => '/home/USER/.rvm/gems/ruby-2.2.0'  # If you are using bundler.
}

# Default deploy_to directory is /var/www/my_app_name
set :deploy_to, '/home/USER/YOUR-APP-FOLDER'

# Default value for :linked_files is []
set :linked_files, fetch(:linked_files, []).
  push('config/DATABASE-CONFIG.yml', 'config/secrets.yml')

# Default value for linked_dirs is []
set :linked_dirs, fetch(:linked_dirs, []).
  push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets')

# Default value for keep_releases is 5
set :keep_releases, 5

namespace :deploy do
  task :install_dependencies do
    on roles(:web), in: :sequence, wait: 5 do
      within release_path do
        execute :bundle, "--without development test"
      end
    end
  end
  after :published, :install_dependencies
end

Gemfile

source 'https://rubygems.org'

# Deploy
gem 'capistrano', '~> 3.4.0'
gem 'capistrano-rvm'