127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4                                     
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6 

# http://docs.openstack.org/trunk/install-guide/install/yum/content/basics-neutron-networking-controller-node.html
# controller
{{ controller_public_ip }}       controller

# network
{{ network_public_ip }}       network

# compute1
# compute1_public_ip        compute1