atlanta-webservers

www-atl-1.example.com www-atl-2.example.com

boston-webservers

www-bos-1.example.com www-bos-2.example.com

atlanta-dbservers

db-atl-1.example.com db-atl-2.example.com

boston-dbservers

db-bos-1.example.com

# webservers in all geos

webservers:children

atlanta-webservers boston-webservers

# dbservers in all geos

dbservers:children

atlanta-dbservers boston-dbservers

# everything in the atlanta geo

atlanta:children

atlanta-webservers atlanta-dbservers

# everything in the boston geo

boston:children

boston-webservers boston-dbservers