The RDB loader is published on Docker Hub
docker pull snowplow/snowplow-rdb-loader:1.2.0
docker run \ snowplow/snowplow-rdb-loader- \ --iglu-config ewogICJzY2hlbWEiOiAiaWdsdTpjb20uc25vd3Bsb3dhbmFseXRp .... \ --config ewogICJuYW1lIjogIkFjbWUgUmVkc2hpZnQiLAog ....
The config options are format are described in the configuration reference.
Please pay attention that schemas for all self-describing JSONs flowing through RDB Loader must be hosted on Iglu Server 0.6.0 or above. Iglu Central is static registry and if you use Snowplow-authored schemas – you need to upload all schemas from there as well.