docker build -t ubuntu.XXX .
docker image ls
docker rmi XXX
docker rm XXX
docker pull ubuntu:14.04
docker run -v /xxx/xxx:/xxx -it ubuntu:14.04 bash
docker start XXX
docker stop XXX
docker restart XXX
docker exec -it XXX bash
docker export XXX > ubuntu_14.04.tar
docker import ubuntu_14.04.tar test/ubuntu:v1.0