A docker image for Riak 2.0 pre 20 running the riak-json which makes Riak act like a JSON data store with using SOLR to query the JSON documents.
I recommend starting this using the following manner (assuming Docker is installed already).
docker pull voodootikigod/riak-json
CONTAINER_ID = $(docker run -p 8087:8087 -p 8098:8098 -d -t voodootikigod/riak-json)
This will expose the protocol buffers and HTTP interface for the Riak JSON interface.