loadbalancer.example.com

[frontends]
frt01.example.com
frt02.example.com

[frontends:vars]
testvar=childgroup

[apps]
app01.example.com
app02.example.com

[databases]
dbms01.example.com
dbms02.example.com

[centos:children]
apps
databases

[ubuntu:children]
frontends

[ubuntu:vars]
testvar=group
