Using subdomains with nginx on Digital Ocean

to test ghost, would like:  ghost.domain.com

to test junco, would like: junco.domain.com

https://www.digitalocean.com/community/articles/how-to-set-up-nginx-virtual-hosts-server-blocks-on-ubuntu-12-04-lts--3

https://www.digitalocean.com/community/questions/wanting-to-run-multiple-sites-with-subdomains

https://www.digitalocean.com/community/articles/how-to-use-the-digitalocean-ghost-application

http://stackoverflow.com/questions/9905378/nginx-subdomain-configuration