Docroot is: /usr/local/var/www

The default port has been set in /usr/local/etc/nginx/nginx.conf to 8080 so that

nginx can run without sudo.

nginx will load all files in /usr/local/etc/nginx/servers/.

To restart nginx after an upgrade:

  brew services restart nginx

Or, if you don't want/need a background service you can just run:

  /usr/local/opt/nginx/bin/nginx -g daemon off;