app_name2.conf

# /etc/init/app_name2.conf

description 'Additional instance of app_name'
author 'author'
env LOG_FILE=PATH_TO_LOG_FILES/stdout.log
env USER=webapp_user

start on starting app_name
stop on stopping app_name
respawn

script
   /bin/sleep 5s
   exec su -s /bin/sh -c 'exec "$0" "$@"' $USER -- PATH_YOUR_APP --port=9191 >> $LOG_FILE 2>&1
end script