I've been fiddling with docker lately and it took me a while to come to this realisation. The docker volume command line argument and the docker VOLUME Dockerfile instruction are a bit different.
The docker volume command line argument:
docker run -v /var/logs:/var/logs ubuntu echo test
And the docker VOLUME Dockerfile instruction:
The Dockerfile VOLUME instruction doesn't support host directories.
As discussed in this stackoverflow post it looks like this is intentional because it makes things less portable.