This image runs
mongod atop a debian:jessie base image. The data is kept in /data/db and the bind address is 0.0.0.0:27017.
docker run -d silverweed/mongo:2
docker run -d -p 27017:27017 silverweed/mongo:2 for a more straightforward usage.
mongo:2 runs as an unprivileged user with UID 1000, so it should be more secure to use with a bind-mounted directory from the host (to keep persistent data, if you don't feel like using a data-only container)