tl;dr : Solr image preconfigured for Drupal with multicore setup
This image provide a SolR 6.6 instance with 4 cores configured : collection1 to collection4.
launch the image :
docker run -p 8080:8983 kgaut/docker-solr-multicore
More information in french : https://kgaut.net/journal/2017/docker-image-pour-solr-avec-plusieurs-core.html