注意，命令均在root账号下使用
1) 安装Docker
高版本Ubuntu输入如下，其他版本自行百度：
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apt install docker.io
2) 启动Ubuntu:12.04容器
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docker run -it --name first ubuntu:12.04 /bin/bash
安装vim
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apt-get update
apt-get install vim
更换国内源
这里更新为网易源：
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vim /etc/apt/sources.list
首先屏蔽原来文件中所有的项，然后在底部添加：
deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted
接着重新update：apt-get update
3) 安装sshd
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apt-get install openssh-server
vim /etc/ssh/sshd_config
修改如下：
UsePAM yes 改为 UsePAM no
UsePrivilegeSeparation sandbox 改为 UsePrivilegeSeparation no
设置一个root密码：
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passwd root
4) 提交容器副本
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exit
docker commit -m="has update" -a="jerry" first myubuntu12:v1
在容器副本基础上开跑，并把容器内22端口映射到宿主机9022端口：
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docker run -d --privileged -p 9022:22 --name u1204 myubuntu12:v1 /sbin/init
打开putty，选择ssh方式，IP地址填写宿主机IP（hostname -I 查看），端口填写9022。
下次启动的方式：
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docker start u1204
5) 安装gcc等
以下在putty上操作：
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apt-get install build-essential
6) 测试效果
新建hello.c文件：
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#include <stdio.h>
int main(int argc, char *argv[]){
printf("hello world!");
return 0;
}
使用两种工具编译：
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gcc hello.c -o hello_byGcc
arm-none-linux-gnueabi-gcc hello.c -o hello_byArm
查看产生的文件信息：
┌--------------------------------------------------------┐
│Command Prompt - □ x │
├--------------------------------------------------------┤
│root@e99b029a518b:~# file hello_by* │
│hello_byArm: ELF 32-bit LSB executable, ARM, version 1 │
│(SYSV), dynamically linked (uses shared libs), for GNU │
│/Linux 2.6.16, not stripped │
│hello_byGcc: ELF 64-bit LSB executable, x86-64, version │
│1 (SYSV), dynamically linked (uses shared libs), for │
│GNU/Linux 2.6.24, BuildID[sha1]=0xb7d7a94f7a3f198c24fc │
│8208af5e8274fb5cfc78, not stripped │
└--------------------------------------------------------┘
