[Rails] finding out where to modify virtual host settings in rails, passenger, apache setup

Hey all,

I have a domain, let's say:

dev.mysite.com

And I want it to listen on port 3000:

dev.mysite.com:3000

Now this is on a remote webserver (not my local apache setup).

I have access to the server (which is apache and it's running on
ubuntu os).

This server is a rails application in it and I want the rails
application to run when the dev.mysite.com:3000 gets response on the
web.

Everything is setup, such as apache, passenger, rails, ruby, ruby
gems, etc. SOmeone set it all up. Now I am just trying to find the
virtual host file so I can set up that domain address to be listening
on port 3000. However, when I run the unix locate command, I get tons
of files like httpd.conf:

/etc/apache2/httpd.conf
/etc/phpmyadmin/lighttpd.conf
/home/username/.rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/test/
stub/apache2/httpd.conf.erb
/home/username/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/test/cgi/
lighttpd.conf
/home/username/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.3/test/cgi/
lighttpd.conf
/home/username/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.4/test/cgi/
lighttpd.conf
/home/username/src/otp_src_R13B04/lib/inets/examples/server_root/conf/
httpd.conf
/usr/local/lib/erlang/lib/inets-5.3/examples/server_root/conf/
httpd.conf
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/mongrel-1.1.5/examples/
httpd.conf
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/passenger-3.0.7/test/stub/
apache2/httpd.conf.erb
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.2/test/cgi/
lighttpd.conf
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.3/test/cgi/
lighttpd.conf
/var/lib/gems/1.8/gems/rack-1.2.2/test/cgi/lighttpd.conf
/var/lib/passenger-standalone/3.0.7-x86_64-ruby1.9.2-linux-
gcc4.4.5-1002/support/test/stub/apache2/httpd.conf.erb

My instinct said that the configuration setup would be in /etc/apache2/
httpd.conf but I went there and that file was empty.

Can anyone advise me which of these files might possibly have the
virtual settings I need to modify in order to get dev.mysite.com to
listen on port 3000 so that when I type in www.mysite.com:3000 in web
address bar, it will respond and load the rails app.

thanks for response

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