Worked recipe at 2014.03.09 - Rails 4.0.3 + Ruby 2.1.0 + puma 2.8.0 + capistrano 2.15.5 + nginx 1.4.4

1. config\deploy.rb

# $:.unshift(File.expand_path('./lib', ENV['rvm_path'])) # Для работы rvm
require 'rvm'
require 'rvm/capistrano'
require 'bundler/capistrano'
require 'puma/capistrano'

set :application, "myapp"
set :rails_env, "production"
ssh_options[:port] = 777
set :port, 777
set :domain, "username@11.22.33.44"
set :deploy_to, "/home/username/projects/#{application}"
set :use_sudo, false

set :rvm_type, :user

set :scm, :git
set :repository,  "ssh://git@11.22.33.44:777/home/git/myapp.git"
set :branch, "master"
set :deploy_via, :remote_cache

role :web, domain
role :app, domain
role :db,  domain, :primary => true

before 'deploy:assets:precompile', :roles => :app do
  run "rm -f #{current_release}/config/database.yml"
  run "rm -f #{current_release}/log"
  run "ln -s #{current_release}/../../shared/log #{current_release}"
  run "rm -f #{current_release}/config/database.yml"
  run "ln -s #{current_release}/../../shared/config/database.yml #{current_release}/config/database.yml"
  run "rm -f #{current_release}/config/environments/production.rb"
  run "ln -s #{current_release}/../../shared/config/environments/production.rb #{current_release}/config/environments/production.rb"
end

before  'deploy:restart',  'deploy:migrate'

namespace :deploy do

  task :create_db do
    run "cd #{deploy_to}/current; bundle exec rake db:create RAILS_ENV=#{rails_env}"
  end

  task :symlink_config, roles: :app do
    run "ln -nfs #{deploy_to}/shared/config/database.yml #{release_path}/config/database.yml"
  end

  task :assets_precompile do
    run "cd #{current_release} && RAILS_ENV=production bundle exec rake assets:precompile"
    run "mv #{current_release}/public/assets/glyphicons-halflings-regular-*.svg #{current_release}/public/assets/glyphicons-halflings-regular.svg"
    run "mv #{current_release}/public/assets/glyphicons-halflings-regular-*.eot #{current_release}/public/assets/glyphicons-halflings-regular.eot"
    run "mv #{current_release}/public/assets/glyphicons-halflings-regular-*.ttf #{current_release}/public/assets/glyphicons-halflings-regular.ttf"
    run "mv #{current_release}/public/assets/glyphicons-halflings-regular-*.woff #{current_release}/public/assets/glyphicons-halflings-regular.woff"
  end

  after "deploy:finalize_update", "deploy:symlink_config" #, "deploy:assets_precompile"
end

2. config\puma.rb

#!/usr/bin/env puma
threads 0, 32
daemonize true
application_path = "/home/username/projects/myapp"
environment railsenv = File.open("#{application_path}/env", "rb").read
pidfile "#{application_path}/shared/sockets/puma.pid"
state_path "#{application_path}/shared/sockets/puma.state"
stdout_redirect "#{application_path}/shared/log/puma.stdout.log", "#{application_path}/shared/log/puma.stderr.log"
#bind "unix://#{application_path}/shared/sockets/puma.sock"
#preload_app!
#activate_control_app

3. Capfile

load 'deploy'
# Uncomment if you are using Rails' asset pipeline
    # load 'deploy/assets'
Dir['vendor/gems/*/recipes/*.rb','vendor/plugins/*/recipes/*.rb'].each { |plugin| load(plugin) }
load 'config/deploy' # remove this line to skip loading any of the default tasks

4. Gemfile

source 'https://rubygems.org'

gem 'inherited_resources'
gem 'rails', '4.0.3'
gem 'mysql2'
gem 'rvm'
gem 'capistrano'
gem 'rvm-capistrano'
gem 'capistrano-ext'
gem 'puma'
...

5. nginx config

upstream myapp {
 server unix:///home/username/projects/myapp/shared/sockets/puma.sock;
}

server {
 listen 2299;
 server_name localhost;
 try_files $uri/index.html $uri.html $uri @myapp;

 location / {
  proxy_pass http://myapp; # match the name of upstream directive which is defined above
  proxy_set_header Host $host;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 }

 location /streams {
  proxy_pass http://myapp;
  proxy_set_header Connection '';
  proxy_http_version 1.1;
  chunked_transfer_encoding off;
  proxy_buffering off;
  proxy_cache off;
 }


 location ~* ^/assets/ {
  root /home/username/projects/myapp/current/public; # I assume your app is located at that location
  # Per RFC2616 - 1 year maximum expiry
  expires 1y;
  add_header Cache-Control public;
  # Some browsers still send conditional-GET requests if there's a
  # Last-Modified header or an ETag header even if they haven't
  # reached the expiry date sent in the Expires header.
  add_header Last-Modified "";
  add_header ETag "";
  break;
 }
}

6. env

development

7. puma_dev_restart

#this file for local run on development machine.
#remote server will start with 'cap deploy', 'cap puma:start', 'cap puma:stop' and so on

rm -f /home/username/projects/myapp/shared/sockets/*.*
puma --debug -b "unix:///home/username/projects/myapp/shared/sockets/puma.sock" --control "unix:///home/username/projects/myapp/shared/sockets/pumactl.sock" --control-token thisisatoken

8. readme

file env: contain only word of rails environment ('development' || 'production') and stored in root of app
folder shared: contain folders
 log: rails and puma log files
 sockets: puma socket files
 
after create this folder make the soft link for log folder to root of app