hosts.example

[pi1]
custom.local

[pi2]
192.168.1.100

[pi3]
raspberrypi.local

[allpis:children]
pi1
pi2
pi3

[prodpis:children]
pi1

[testpis:children]
pi2

# Any new Raspberry Pis that don't have ssh an ssh key set up yet.
[newpis:children]
pi3

[newpis:vars]
ansible_ssh_user=pi
ansible_ssh_pass=raspberry