Some tasks I'm using with Unicorn

unicorn_cap_tasks.rb

set :unicorn_binary, "/usr/bin/unicorn"
set :unicorn_config, "#{current_path}/config/unicorn.rb"
set :unicorn_pid, "#{current_path}/tmp/pids/unicorn.pid"

namespace :deploy do
  desc "Start unicorn"
  task :start, :roles => :app, :except => { :no_release => true } do 
    run "cd #{current_path} && #{try_sudo} bundle exec #{unicorn_binary} -c #{unicorn_config} -E #{rails_env} -D"
  end

  desc "Stop unicorn"
  task :stop, :roles => :app, :except => { :no_release => true } do
    unicorn_pid_command(:stop, "kill")
  end

  desc "Gracefully stop unicorn"
  task :graceful_stop, :roles => :app, :except => { :no_release => true } do
    unicorn_pid_command(:graceful_stop, "kill -s QUIT")
  end

  desc "Reload unicorn"
  task :reload, :roles => :app, :except => { :no_release => true } do
    unicorn_pid_command(:reload, "kill -s USR2")
  end

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


def unicorn_pid_command(task, cmd)
  cmd = "#{try_sudo} #{cmd} `cat #{unicorn_pid}`"
  if remote_file_exists?(unicorn_pid)
    run cmd
  else
    puts "Unicorn pidfile doesn't exists so I couldn't run #{task} task: '#{cmd}'"
  end
end