Docker image to Virtualbox disk
https://stackoverflow.com/questions/23436613/how-can-i-convert-a-docker-image-into-a-vagrant-virtualbox-box by user blueskin (CC by-sa 3.0)
Find the size of the docker image from docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mybuntu 1.01 7c142857o35 2 weeks ago 1.94 GB
Run a container based on the image docker run mybuntu:1.01
Create a QEMU image from the container, Also, use the size of the image in the first command (seek=IMAGE_SIZE). And, for the docker export command retrieve the appropriate container id from docker ps -a
dd if=/dev/zero of=mybuntu.img bs=1 count=0 seek=2G
mkfs.ext2 -F mybuntu.img
sudo mount -o loop mybuntu.img /mnt
docker export <CONTAINER-ID> | sudo tar x -C /mnt
sudo umount /mnt
Use qemu-utils to convert to vmdk
sudo apt-get install qemu-utils qemu-img convert -f raw -O vmdk mybuntu.img mybuntu.vmdk
More info on formats that are available for conversion can be found here. https://docs.openstack.org/image-guide/convert-images.html
Now you can import the vmdk file in virtualbox