$HOST1> weave launch
$HOST2> weave launch $HOST1
$HOST1> eval $(weave env)
$HOST2> eval $(weave env)
$HOST1> docker run --name neo-1 -d -P ... my/neo4j-cluster
$HOST2> docker run --name neo-2 -d -P ... my/neo4j-cluster
$HOST3> docker run --name neo-1 -d -P -e ARBITER=true ... my/neo4j-cluster

- name: Start Neo Arbiter
command: 'docker run --name neo-2 -d -P ... my/neo4j-cluster'
environment:
  DOCKER_HOST: 'unix:///var/run/weave/weave.sock'

- name: Start Neo Arbiter
    docker:
      image: "my/neo4j-cluster:{{neo4j_version}}"
      docker_url: unix:///var/run/weave/weave.sock
      name: neo-3
      pull: missing
      state: reloaded
      detach: True
      publish_all_ports: True

- name: Start Neo Arbiter
    docker:
      image: "my/neo4j-cluster:{{neo4j_version}}"
      docker_url: unix:///var/run/weave/weave.sock
      name: neo-3
      pull: missing
      state: reloaded
      detach: True
      publish_all_ports: True
    environment:
        DOCKER_HOST: 'unix:///var/run/weave/weave.sock'