[metal:children]
masters
workers

[masters]
metal0 ansible_host=192.168.1.110 mac='00:23:24:d1:f3:f0'
metal1 ansible_host=192.168.1.111 mac='00:23:24:d1:f4:d6'
metal2 ansible_host=192.168.1.112 mac='00:23:24:e7:04:60'

[workers]
metal3 ansible_host=192.168.1.113 mac='00:23:24:d1:f5:69'