Node.js deploy /w Capistrano 3

deploy.rb

# config/deploy.rb

# config valid only for Capistrano 3.1
lock '3.1.0'

set :application, 'my_app'
set :repo_url, 'git@github.com:USER/my_app.git'

# Default deploy_to directory is /var/www/my_app
set :deploy_to, '/var/node/my_app'

# Default value for :scm is :git
set :scm, :git

# Default value for :format is :pretty
set :format, :pretty

# Default value for :log_level is :debug
set :log_level, :debug

# Default value for :pty is false
# set :pty, true

# Default value for :linked_files is []
# set :linked_files, %w{config/config.json}

# Default value for linked_dirs is []
# set :linked_dirs, %w{log}

set :node_env, (fetch(:node_env) || fetch(:stage))

# Default value for default_env is {}
set :default_env, { node_env: fetch(:node_env) }

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

set :pid_file_name, 'my_app.pid'
set :pid_file, "/home/#{fetch(:user)}/.forever/pids/#{fetch(:pid_file_name)}"

namespace :deploy do

  desc 'Install node modules non-globally'
  task :npm_install do
    on roles(:app) do
      execute "cd #{release_path} && npm install"
    end
  end

  desc 'Start application'
  task :start do
    on roles(:app) do
      within current_path do
        execute :forever, 'start', '--pidFile', fetch(:pid_file_name), "#{current_path}/server.js"
      end
    end
  end

  desc 'Stop application'
  task :stop do
    on roles(:app) do
      within current_path do
        execute :forever, 'stop', "#{current_path}/server.js"
      end
    end
  end

  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      within current_path do
        if test("[ -e #{fetch(:pid_file)} ]") && execute("kill -0 `cat #{fetch(:pid_file)}` > /dev/null 2>&1")
          execute :forever, 'restart', '--pidFile', fetch(:pid_file_name), "#{current_path}/server.js"
        else
          execute :forever, 'start', '--pidFile', fetch(:pid_file_name), "#{current_path}/server.js"
        end
      end
    end
  end

  after :publishing, :restart

  after :restart, :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      # Here we can do anything such as:
      # within release_path do
      #   execute :rake, 'cache:clear'
      # end
    end
  end

  before :restart, 'deploy:npm_install'

end

staging.rb

# config/deploy/staging.rb

server 'HOSTNAME',
  user: fetch(:user), roles: %w{app},
  ssh_options: {
    forward_agent: true,
    keys: ['path/to/keyfile']
  }