[databases] openstack01-node02 [keystone] openstack01-node03 [dockerregistry] openstack01-node01 [glance-controller] openstack01-node02 [horizon] openstack01-node03 [rabbitmq] openstack01-node01 openstack01-node02 openstack01-node03 [cassandra] openstack01-node[01:03] [first_cassandra] openstack01-node01 [next_cassandra] openstack01-node02 openstack01-node03 [memcached] openstack01-node03 [first_cassandra:vars] run_options="" [next_cassandra:vars] run_options="-e CASSANDRA_SEEDS=172.23.41.1" [nova-controller] openstack01-node01 [nova-compute] openstack01-node04