ConvertQcow2ToDockerImage

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Create vm

Create vm disks:

# qemu-img create -f qcow2 2004.qcow2 6G

Install system into this qcow2 files with your customized settings.

Convert

Convert into img file:

$ qemu-img convert -f vmdk -O raw 2004.qcow2 2004.img

Using guestfish for converting into docker images:

$ sudo guestfish -a 2004.img --ro
$ ><fs> run
$ ><fs> list-filesystems
/dev/sda1: ext4
/dev/sda2: unknown
/dev/sda5: swap
$ ><fs> mount /dev/sda1 /
$ ><fs> tar-out / - | xz --best >> my2004.xz
$ ><fs> exit
$ cat my2004.xz | docker import - YourImagesName

Now push it into dockerhub, next time you could use it freely.