If anyone wants to set up a few testing sites on only one IP server, we could modify the Nginx config file to open different port for servers deployment.
server { listen 180; server_name localhost; root /home/ruling/orbit_1/public; # <--- be sure to point to 'public'! passenger_enabled on; rails_env production;
server { listen 280; server_name localhost; root /home/ruling/orbit_2/public; # <--- be sure to point to 'public'! passenger_enabled on; rails_env production;