README.md

Build boot2docker.iso with VirtualBox Guest Additions

Allows me to mount /Users into boot2docker which is incredibly useful for my local Docker environment under Mac OSX. So from Mac I can do sth like this:
docker run -v /Users/mattes/somedir:/data/somedir [..].

This Dockerfile will download the latest boot2docker image (see FROM boot2docker/boot2docker) and adds VirtualBox Guest Additions for your running VirtualBox version.

See also boot2docker/boot2docker#284.

I tried to make the mount permanent from within the VirtualBox GUI (see screenshot) but that didn't work. So I added the mount logic to $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount (see Dockerfile.tmpl)

See build log here https://gist.github.com/mattes/6bed15318e93925b1280

# generate Dockerfile from Dockerfile.tmpl
chmod +x build_docker.sh
./build_docker.sh

# build the actual boot2docker.iso with virtual box guest additions
docker build -t mattes/boot2docker-vbga .

# the following line is proposed in many tutorials, but does not work for me
# (it outputs an iso that won't work)
docker run -i -t --rm mattes/boot2docker-vbga > boot2docker.iso

# so I do:
docker run -i -t --rm mattes/boot2docker-vbga /bin/bash
# then in a second shell:
docker cp <Container-ID>:boot2docker.iso boot2docker.iso

# use the new boot2docker.iso
boot2docker stop
mv ~/.boot2docker/boot2docker.iso ~/.boot2docker/boot2docker.iso.backup
mv boot2docker.iso ~/.boot2docker/boot2docker.iso
VBoxManage sharedfolder add boot2docker-vm -name home -hostpath /Users
boot2docker up
boot2docker ssh "ls /Users" # to verify if it worked

build_docker.sh

#!/usr/bin/env sh

get_vbox_version(){
    local VER
    VER=$(VBoxManage -v | awk -F "r" '{print $1}')
    if [ -z "$VER" ]; then
        echo "ERROR"
    else
        echo "$VER"
    fi

}

write_vbox_dockerfile(){
    local VER
    VER=$(get_vbox_version)
    if [ ! "$LATEST_RELEASE" = "ERROR" ]; then
        sed "s/\$VBOX_VERSION/$VER/g" Dockerfile.tmpl > Dockerfile
    else
        echo "WUH WOH"
    fi
}

write_vbox_dockerfile

Dockerfile.tmpl

# using VirtualBox version $VBOX_VERSION

FROM boot2docker/boot2docker
RUN apt-get install p7zip-full

RUN mkdir -p /vboxguest && \
    cd /vboxguest && \
    curl -L -o vboxguest.iso http://download.virtualbox.org/virtualbox/$VBOX_VERSION/VBoxGuestAdditions_$VBOX_VERSION.iso && \
    7z x vboxguest.iso -ir'!VBoxLinuxAdditions.run' && \
    sh VBoxLinuxAdditions.run --noexec --target . && \
    mkdir x86 && cd x86 && tar xvjf ../VBoxGuestAdditions-x86.tar.bz2 && cd .. && \
    mkdir amd64 && cd amd64 && tar xvjf ../VBoxGuestAdditions-amd64.tar.bz2 && cd .. && \
    cd amd64/src/vboxguest-$VBOX_VERSION && KERN_DIR=/linux-kernel/ make && cd ../../.. && \
    cp amd64/src/vboxguest-$VBOX_VERSION/*.ko $ROOTFS/lib/modules/$KERNEL_VERSION-tinycore64 && \
    mkdir -p $ROOTFS/sbin && cp x86/lib/VBoxGuestAdditions/mount.vboxsf $ROOTFS/sbin/

RUN echo "" >> $ROOTFS/etc/motd; \
    echo "  boot2docker with VirtualBox guest additions version $VBOX_VERSION" >> $ROOTFS/etc/motd; \
    echo "" >> $ROOTFS/etc/motd

# make mount permanent @todo it works, but its ugly. where should this go?
RUN echo '#!/bin/sh' >> $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount; \
    echo 'sudo modprobe vboxsf && sudo mkdir /Users && sudo mount -t vboxsf home /Users' >> $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount
RUN chmod +x $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount
RUN echo '/etc/rc.d/vbox-guest-additions-permanent-mount' >> $ROOTFS/opt/bootsync.sh

RUN depmod -a -b $ROOTFS $KERNEL_VERSION-tinycore64
RUN /make_iso.sh
CMD ["cat", "boot2docker.iso"]

virtualbox-boot2docker-guest-addtions.png

I just tried this today on a Windows 7 box. I followed the instructions at https://medium.com/boot2docker-lightweight-linux-for-docker/boot2docker-together-with-virtualbox-guest-additions-da1e3ab2465c starting with the "...system replace the old one at ~/.boot2docker/boot2docker.iso". (I downloaded the ISO instead of building my own from http://static.dockerfiles.io/boot2docker-v1.2.0-virtualbox-guest-additions-v4.3.14.iso).

After running the boot2docker init to generate the new virtual machine, I ran the same vboxmanage to add another shared folder from a separate partition:

using cygwin bash shell

ensure the boot2docker VM is not running

boot2docker down

add the expected users partition for Windows system

VBoxManage sharedfolder add boot2docker-vm -name home -hostpath c:/Users

add my other partition

VBoxManage sharedfolder add boot2docker-vm -name -hostpath

example

VBoxManage sharedfolder add boot2docker-vm -name dockshare -hostpath f:/docker/

restart the boot2docker VM

boot2docker up

log in

boot2docker ssh

verify original users mapped

ls -alF /Users

the fun stuff, adding the second path in NON-PERSISTENT mode

sudo modprobe vboxsf && sudo mkdir / && sudo mount -t vboxsf /

example

sudo modprobe vboxsf && sudo mkdir /hostshare && sudo mount -t vboxsf dockshare /hostshare

NOTE:
To make a persistent share, you have to modify the dockerfile.tmpl shown above adding the additional shares to this section:

make mount permanent @todo it works, but its ugly. where should this go?

RUN echo '#!/bin/sh' >> $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount;
echo 'sudo modprobe vboxsf && sudo mkdir /Users && sudo mount -t vboxsf home /Users' >> $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount;
echo 'sudo modprobe vboxsf && sudo mkdir / && sudo mount -t vboxsf /' >> $ROOTFS/etc/rc.d/vbox-guest-additions-permanent-mount

Rerun the build script to create the ISO file and run the steps again starting with the replace current ISO after stopping the B2D VM

It works for me! I had to add the -y option to the 7z command for some reason "7z x -y ...", and then to recover from the error had to remove the mkdir commands.