准备工作:将系统进行格式转化并压缩,生成centos7-demo.tar镜像文件
tar --numeric-owner --exclude=/proc --exclude=/sys -cvf centos7-demo.tar /
docker import centos7-demo.tar centos7
docker run -itd --privileged -v /etc/timezone:/etc/timezone -v /etc/localtime:/etc/localtime --name centos7 -p 9999:80 centos7 /usr/sbin/init
docker exec -it ID /bin/bash
docker export 容器ID> centos.tar