Capistrano recipe for multi-stage deployment running Passenger standalone

gistfile1.rb

$:.unshift(File.expand_path('./lib', ENV['rvm_path']))
require "rvm/capistrano"

# REPLACE this below with your ruby version/gemset version:  YOUR_RUBY_VERSION@YOUR_GEM_SET
set :rvm_ruby_string, 'ruby-1.9.2-p136@example_gemset'

set :use_sudo, false
set :stages, %w(production staging)
set :default_stage, "staging"
require 'capistrano/ext/multistage'

# REPLACE this below with your git repo
set :repository,  "git@github.com:example/example.git"
set :scm, :git
set :branch, "master"
set :deploy_via, :remote_cache

# REPLACE the below with your deploy server credentials/server domain name (or ip)
set :user, 'exampleuser'
server "example.com", :app, :web, :db, :primary => true

after "deploy:update_code", 
  "deploy:update_shared_symlinks"

set :bundle_flags, '--deployment'
require "bundler/capistrano"

after "bundle:install", 
  "deploy:migrate"

after "deploy", 
  "deploy:cleanup"

namespace :deploy do
  task :start do ; end
  task :stop  do ; end
  
  # This task with bounce the standalone passenger server (running the embedded nginx server).  
  # The rails_env and passenger_port are specified in the deploy environment files, ex: "config/deploy/staging.rb"
  desc "Restart Passenger server"
  task :restart, :roles => :app, :except => { :no_release => true } do
    run <<-CMD
      if [[ -f #{release_path}/tmp/pids/passenger.#{passenger_port}.pid ]]; 
      then 
        cd #{deploy_to}/current && passenger stop -p #{passenger_port} --pid-file #{release_path}/tmp/pids/passenger.#{passenger_port}.pid;
      fi
    CMD
    # restart passenger standalone on the specified port/environment and as a daemon
    run "cd #{deploy_to}/current && #{try_sudo} passenger start -e #{rails_env} -p #{passenger_port} -d" 
  end

  desc "Update shared symbolic links"  
  task :update_shared_symlinks do
    shared_files = ["config/database.yml"]
    shared_files.each do |path|
      run "rm -rf #{File.join(release_path, path)}"
      run "ln -s #{File.join(deploy_to, "shared", path)} #{File.join(release_path, path)}"
    end
  end
end