How to convert a Vagrant box to a Docker image
I replayed this with EC2 boxes and Virtualbox boxes in my Github project blacklabelops/centos. I have prepared a Vagrantfile with the necessary installation and you can try it yourself with your Vagrant boxes.
EC2 boxes:
Create and provision an AMI image with https://github.com/katzj/ami-creator - Skripts in my repository.
Afterwards use Guestfish in order to extract the image into a tarball. - Skripts in my repository.
Import the tarball inside Docker. - Example in my repository.
And now with Vagrant Virtualbox, commands can be replayed with my provided Vagrantfile. Just clone the repository, spin it up and type:
$ qemu-img convert -f vmdk -O raw MyTry-disk1.vmdk mytry.img
The Vagrant box's VMDK can be found in the Virtualbox folder, usually ~/VirtualBox\ VMs/.
After the raw has been created you can apply Guestfish.
$ guestfish -a mytry.img --ro$ ><fs> run
Note: tty
$ ><fs> list-filesystems /dev/sda1: ext4/dev/VolGroup/lv_root: ext4/dev/VolGroup/lv_swap: swap$ ><fs> mount /dev/VolGroup/lv_root /$ ><fs> tar-out / - | xz --best >> mytry.xz$ ><fs> exit
Note: exiting tty
Importing into docker:
$ cat mytry.xz | docker import - mytryimage
Look inside the container
$ docker run -it mytryimage bash