Capistrano 3 configuration for starting/stopping/restarting Unicorn

gistfile1.rb

namespace :deploy do

  desc 'Start application'
  task :start do
    on roles(:app), in: :sequence, wait: 5 do
      within "#{release_path}" do
        execute :bundle, :exec, :unicorn, '-D', '-E', :production, "-c", "config/unicorn.rb"
      end
    end
  end

  desc 'Stop application'
  task :stop do
    on roles(:app), in: :sequence, wait: 5 do
      within "#{fetch(:deploy_to)}" do
        pid = capture(:cat, 'shared/tmp/pids/unicorn.pid')
        execute :kill, '-QUIT', pid
      end
    end
  end

  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      within "#{fetch(:deploy_to)}" do
        pid = capture(:cat, 'shared/tmp/pids/unicorn.pid')
        execute :kill, '-USR2', pid
      end
    end
  end
end