I think it was intended to create multiple carbon-cache in the same image: https://github.com/nickstenning/docker-graphite/blob/3588ba73cf115c15e3de123d9da41b6289cf1a37/carbon.conf#L79 but these server1-3 are never spawned. Should the `carbon.conf` should be change to [this](https://github.com/graphite-project/carbon/issues/632#issuecomment-284453880).
