Docker remove container completely
docker rm ... does not remove a 'volume' that is associated with this container. It is especially noticeable when running large images, like MongoDB (that requires about 3GB or reserved disk space).
To completely remove a container, use
-v flag, like this
docker rm -v ....
Here is paragraph from
docker help rm:
-v, --volumes=false Remove the volumes associated with the container
Related GitHub issue.