; in /etc/supervisor/conf.d/my_app_daemon.conf

[program:my_app_daemon]
command="bundle exec my_app_daemon run"  ; a daemon-kit app in a rails project
environment="RAILS_ENV=staging, DAEMON_ENV=staging, BUNDLE_GEMFILE=/home/myapp/staging/current/Gemfile"
directory=/home/myapp/staging/current/bin