一、docker基本命令
1.docker 获取镜像
将从 Docker Hub 仓库下载一个 Ubuntu 12.04 操作系统的镜像
docker pull ubuntu:12.04
Pulling repository ubuntu
ab8e2728644c: Pulling dependent layers
511136ea3c5a: Download complete
5f0ffaa9455e: Download complete
a300658979be: Download complete
904483ae0c30: Download complete
ffdaafd1ca50: Download complete
d047ae21eeaf: Download complete
1.2.
原文：https://www.cnblogs.com/Robi-9662/p/9901241.html