OS: x86 Debian 8 (Jessie)
Before you start, Some packets must be installed in you environment.
# apt-get install binfmt-support qemu qemu-user-static debootstrap
Run gen_debian_aarch64_rootfs.sh to generate the rootfs.tar.gz into output directory.
# ./gen_debian_aarch64_rootfs.sh
Use Dockerfile to build image
# docker build -t aarch64-debian .