创建Dockerfile并且更新apt源
在Dockerfile中添加如下两句代码：
RUN sed -i s@/archive.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list
RUN apt-get clean
更新apt源的Dockerfile如下：
FROM ubuntu:latest
MAINTAINER kk "kk@qq.com"
RUN sed -i s@/archive.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list
RUN apt-get clean
RUN apt-get update
