Daemonsでデーモン化したスクリプトをCapistranoから起動できるようにする

hello.rb

##### hello.rb

#!/usr/bin/env ruby
require 'daemons'
require 'logger'

# Initialize
logpath = File.expand_path("app.log")
log = Logger.new(logpath)
log.info("Completely initialized")

# Daemonize
Daemons.run_proc("app") do
  log = Logger.new(logpath)
  loop do
    log.info "Hello daemons world!"
    sleep(5)
  end
end



##### Capfile

load 'config/deploy'



##### config/deploy.rb

require "capistrano/ext/multistage"
require 'bundler/capistrano'
require "railsless-deploy"

# Application settings
set :application, "capistrano-daemons-deploy"
set :stages, %w{development}
set :default_stage, "development"

# Git repository
set :repository,  "git@git-repos:#{application}.git"
set :scm, :git

set :deploy_via, :copy

# RVM settings
require 'rvm/capistrano'
set :rvm_ruby_string , "ruby-2.0.0@#{application}"
before 'deploy:setup', 'rvm:install_rvm'
before 'deploy:setup', 'rvm:install_ruby'

# Hello script daemons
namespace :hello do
  desc "Start daemons script"
  task :start , :roles=>:app do
    run "cd #{current_path} && bundle exec ruby hello.rb start"
  end

  desc "Stop daemons script"
  task :stop, :roles=>:app do
    run "cd #{current_path} && bundle exec ruby hello.rb stop"
  end

  desc "Restart daemons script"
  task :restart, :roles=>:app do
    run "cd #{current_path} && bundle exec ruby hello.rb restart"
  end

  desc "Execute tail log file"
  task :log, :roles=>:app do
    run "cd #{current_path} && tail app.log"
  end
end


##### config/deploy/development.rb

# Application server
role :app, "app_server.net"
set :user, "app_user"
set :use_sudo, false
set :deploy_to, "/home/#{user}/#{application}"
ssh_options[:port] = "22"
default_run_options[:pty] = true



##### Gemfile

# A sample Gemfile
source "https://rubygems.org"
ruby "2.0.0"

# Deploy tools
group :deploy do
  gem "capistrano"
  gem "capistrano-ext"
  gem "capistrano_colors"
  gem "railsless-deploy"
  gem "rvm-capistrano"
end

# Daemons
gem "daemons"

# Logging
gem "logger"