*`segments_path`, the local path to save segments to
*`db_args`, the arguments for connecting to the wubloader database
*`ports`, the ports to expose each service on. Only the `nginx` port (default on port 80) needs to be externally accessible for a non-database node as all the other services are routed thought `nginx`.
By default the `downloader`, `restreamer`, `backfiller`, `cutter`, `thrimshim` and `nginx` services of the wubloader will be run. To change which services are run edit the `enabled` object in `docker-compose.jsonnet`. A complete wubloader set up also requires one and only one `database` service (though having a backup database is a good idea) and one and only one `sheetsync` service. TODO: explain how to setup database