You can tell passenger to start the application in production environment with following command on shell by going to the app folder first. I wanted to use Passenger for Redmine app.
Log into shell and go to app directory and type the following command:
root@server [/home/redmine]# passenger start -a 0.0.0.0 -p 3000 -d -e production
In the above command, 3000 is the port where server listens to the requests, and 0.0.0.0 tells the server to listen to all IP addresses. If you remove it, you will only be able to access it from localhost.
Login to shell and type following command:
root@server [/home/redmine]# passenger stop -p 3000
Hope that helps.