[databases] ansible-test [keystone] ansible-test [dockerregistry] openstack01-node01 [rabbitmq] ansible-test ansible-test-2 ansible-test-3 [cassandra] openstack01-node[01:03] [first_cassandra] openstack01-node01 [next_cassandra] openstack01-node02 openstack01-node03 [first_cassandra:vars] run_options="" [next_cassandra:vars] run_options="-e CASSANDRA_SEEDS=172.23.41.1"