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