I went through the etc/nginx/sites-available/default file but didn't find the configuration setup. In many Documentations explained about application but not how the webserver is configured.
https://openedx.atlassian.net/wiki/display/OpenOPS/Open+edX+Operations+Home
http://edx.readthedocs.io/projects/edx-installing-configuring-and-running/en/latest/index.html