独角兽，安装capistrano

# RVM bootstrap
# $:.unshift(File.expand_path(\"/home/tim/.rvm/lib\"))
$:.unshift(File.expand_path(\'./lib\', ENV[\'rvm_path\']))
require \'rvm/capistrano\'
set :rvm_ruby_string, \'1.9.2\'
set :rvm_type, :user

# bundler bootstrap
require \'bundler/capistrano\'

# main details
set :application, \"polco\"
role :web, \"13.213.13.94\"
role :app, \"13.213.13.94\"
role :db, \"13.213.13.94\", :primary => true
set :rails_env, \"production\"

default_run_options[:pty] = true
ssh_options[:forward_agent] = true
set :deploy_to, \"/home/passenger/cba\"
set :deploy_via, :remote_cache
set :user, \"passenger\"
set :use_sudo, false

# repo details
set :scm, :git
set :scm_username, \"tbbooher\"
set :repository, \"git@github.com:tbbooher/foo.git\"
set :branch, \"master\"
set :git_enable_submodules, 1
set :keep_releases, 5

# # server details
set :unicorn_pid, \"#{shared_path}/pids/unicorn.pid\"

after \"deploy\", \"deploy:cleanup\"

namespace :unicorn do
  desc \"start unicorn\"
  task :start, :roles => :app, :except => {:no_release => true} do
    run \"cd #{current_path} && bundle exec unicorn_exec start\"
  end
  desc \"stop unicorn\"
  task :stop, :roles => :app, :except => {:no_release => true} do
    run \"#{current_path}/bundle exec unicorn_exec stop\"
  end
  desc \"unicorn reload\"
  task :reload, :roles => :app, :except => {:no_release => true} do
    run \"#{current_path}/bundle exec unicorn_exec reload\"
  end
  desc \"graceful stop unicorn\"
  task :graceful_stop, :roles => :app, :except => {:no_release => true} do
    run \"#{try_sudo} kill -s QUIT `cat #{unicorn_pid}`\"
  end
  desc \"restart unicorn\"
  task :restart, :roles => :app, :except => {:no_release => true} do
    run \"#{current_path}/bundle exec ./unicorn_exec restart\"
  end

  after \"deploy:restart\", \"unicorn:restart\"
end

after \"deploy:update_code\", \"deploy:config_symlink\"
# hope this works
before \"deploy:restart\", \"deploy:fix_file_permissions\"

namespace :deploy do

  task :config_symlink do
    run \"ln -s #{shared_path}/application.yml #{release_path}/config/application.yml\"
    run \"ln -s #{shared_path}/mongoid.yml #{release_path}/config/mongoid.yml\"
    run \"ln -s #{shared_path}/mailserver_setting.rb #{release_path}/config/mailserver_setting.rb\"
    run \"ln -s #{shared_path}/omniauth_settings.rb #{release_path}/config/omniauth_settings.rb\"
  end

  desc \"Fix file permissions\"
  task :fix_file_permissions do
    run \"chmod a+x #{current_path}/unicorn_exec\"
  end
end

namespace :deploy do
  task :restart do
  end
end

#! /bin/sh

### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $local_fs $remote_fs $network $syslog
# Required-Stop:     $local_fs $remote_fs $network $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the unicorn web server
# Description:       starts unicorn
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/home/passenger/.rvm/gems/ruby-1.9.2-p180/bin/unicorn_rails
DAEMON_OPTS=\"-c /home/passenger/cba/current/config/unicorn_tacitus.rb -E production -D\"


NAME=unicorn_rails
DESC=unicorn_rails
PID=/home/passenger/cba/shared/pids/unicorn.pid

case \"$1\" in
  start)
    echo -n \"Starting $DESC: \"
    $DAEMON $DAEMON_OPTS
    echo \"$NAME.\"
    ;;
  stop)
    echo -n \"Stopping $DESC: \"
        kill -QUIT `cat $PID`
    echo \"$NAME.\"
    ;;
  restart)
    echo -n \"Restarting $DESC: \"
        kill -QUIT `cat $PID`
    sleep 1
    $DAEMON $DAEMON_OPTS
    echo \"$NAME.\"
    ;;
  reload)
        echo -n \"Reloading $DESC configuration: \"
        kill -HUP `cat $PID`
        echo \"$NAME.\"
        ;;
  *)
    echo \"Usage: $NAME {start|stop|restart|reload}\" >&2
    exit 1
    ;;
esac

exit 0

worker_processes 2
base_dir = \"/home/passenger/cba/current\"
shared_path = \"/home/passenger/cba/shared\"
working_directory base_dir

preload_app true

# we destroy all workers who are taking too long
timeout 30

# This is where we specify the socket.
# We will point the upstream Nginx module to this socket later on
listen \"/tmp/sockets/unicorn.sock\", :backlog => 64

pid \"#{shared_path}/pids/unicorn.pid\"

# Set the path of the log files inside the log folder of the testapp
stderr_path \"#{shared_path}/log/unicorn.stderr.log\"
stdout_path \"#{shared_path}/log/unicorn.stdout.log\"

before_fork do |server, worker|
# This option works in together with preload_app true setting
# What is does is prevent the master process from holding
# the database connection
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
# Here we are establishing the connection after forking worker
# processes
  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end

executing \"/home/passenger/cba/current/bundle exec ./unicorn_exec restart\"
    servers: [\"16.213.39.23\"]
    [16.213.39.23] executing command
 ** [out :: 16.213.39.23] bash: /home/passenger/cba/current/bundle: No such file or directory
    command finished in 613ms
failed: \"rvm_path=$HOME/.rvm/ $HOME/.rvm/bin/rvm-shell \'1.9.2\' -c \'/home/passenger/cba/current/bundle exec ./unicorn_exec restart\'\" on 16.223.39.23