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I am currently using Boot2Docker on Windows. Is it possible to mount root to host?

Say that I'm using an Ubuntu image and I would like to mount / to the host. How can I do so?

I've been looking around and trying:

docker run -v /c/Users/ubuntu:/ --name ubuntu -dt ubuntu
But I ended up with an error:
docker: Error response from daemon: Invalid bind mount spec "/c/Users/ubuntu:/": volumeslash: Invalid specification: destination can't be '/' in '/c/Users/Leon/ubuntu:/'.
If I understand correctly, you are trying to mount root inside a container as a volume? If that is the case, rather create a new directory inside and expose that one.
For example, dockerfile:
RUN mkdir /something
VOLUME /something
As the Docker documentation says, the container directory must always be an absolute path such as /src/docs. The host-dir can either be an absolute path or a name value.
For more information read this: https://docs.docker.com/engine/userguide/containers/dockervolumes/#mount-a-host-directory-as-a-data-volume and part "Mount a host directory as a data volume" should give you better understanding.
                What i'm trying to achieve actually is to expose all the files from container's / path to the Host, is it possible? I do know to mount a single directory but that's not really what I want.
– Leon
                Mar 17, 2016 at 8:20
                No that's not possible...container has some files which cannot be exposed as you don't have root access inside container.
– Prototype
                Mar 17, 2016 at 9:04
                hmm i guess this is a bad question then :\ i wish to expose all the files to host so that i can edit them easily using IDE or stuff like that.. I guess I'm down to mounting directories then
– Leon
                Mar 17, 2016 at 9:20
                Why would you need root folder for doing all that. If you create project in folder project and then create same directory inside container, copy all files and expose a volume you will be able to do exactly what you want.
– Prototype
                Mar 17, 2016 at 9:37
It's the problem with how you are specifying the path. See the example of mounting a local volume to be used by a container for MongoDB:
docker run --name *container-name* -v **/Users/SKausha3/mongo/imageservicedb/data**:/*data* -v **/Users/SKausha3/mongo/imageservicedb/backup**:/*backup*
c:/Users/SKausha3/mongo/imageservicedb/data is my local folder, but you have to remove 'c:' from the path.
Since you cant mount "/" one option is to add a "WORKDIR" to your Dockerfile, that way all subsequent commands will be relative to that dir and you wont have to modify anything!
FROM python:latest
WORKDIR /myapp
COPY appfile.py appfile.py
In your docker image, the "appfile.py" file will be in the /myapp/appfily.py location.
You cannot specify the '/' root directory of container but you can mount all the folders in to docker volumes present in root directory.....
create volumes by running these command one by one or you can create bash script
docker volume create var
docker volume create usr
docker volume create tmp
docker volume create sys
docker volume create srv
docker volume create sbin
docker volume create run
docker volume create root
docker volume create proc
docker volume create opt
docker volume create mnt
docker volume create media
docker volume create libx32
docker volume create lib64
docker volume create lib32
docker volume create lib
docker volume create home
docker volume create etc
docker volume create dev
docker volume create boot
docker volume create bin 
Then run this command
docker run -it -d \
--name=ubuntu-container \
--mount source=var,destination=/var \
--mount source=usr,destination=/usr \
--mount source=tmp,destination=/tmp \
--mount source=sys,destination=/sys \
--mount source=srv,destination=/srv \
--mount source=sbin,destination=/sbin \
--mount source=run,destination=/run \
--mount source=root,destination=/root \
--mount source=opt,destination=/opt \
--mount source=mnt,destination=/mnt \
--mount source=media,destination=/media \
--mount source=libx32,destination=/libx32 \
--mount source=lib64,destination=/lib64 \
--mount source=lib32,destination=/lib32 \
--mount source=lib,destination=/lib \
--mount source=home,destination=/home \
--mount source=etc,destination=/etc \
--mount source=boot,destination=/boot \
--mount source=bin,destination=/bin \
ubuntu:latest
        
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