opengrok version: opengrok-0.12.1.5
image base on: tomcat:8.0
to start:
sudo docker run --rm \
-v /path/to/source:/src \
-v /path/to/opengrok_data:/data \
-p 8888:8080 \
scue/docker-opengrok
then, the search engine is available at http://localhost:8888/.