capistranoのunicorn再起動のところ

deploy.rb

namespace :deploy do
  task :start, :roles => :app, :except => { :no_release => true } do
    run "cd #{current_path} && bundle exec unicorn -c #{current_path}/config/unicorn.rb -E production -D"
  end

  task :stop, :roles => :app, :except => { :no_release => true } do
    run "kill -KILL -s QUIT `cat #{shared_path}/pids/unicorn.pid`"
  end

  task :restart, :roles => :app, :except => { :no_release => true } do
    stop
    start
  end
end