[cluster]
cluster1 ansible_ssh_host=192.168.33.100 ansible_ssh_user=vagrant ansible_ssh_private_key_file=~/.vagrant.d/insecure_private_key
cluster2 ansible_ssh_host=192.168.33.110 ansible_ssh_user=vagrant ansible_ssh_private_key_file=~/.vagrant.d/insecure_private_key
cluster3 ansible_ssh_host=192.168.33.120 ansible_ssh_user=vagrant ansible_ssh_private_key_file=~/.vagrant.d/insecure_private_key