自制docker basic image
docker的安装和入门见官网教程：http://docs.docker.com/下面是自制docker basic image的步骤，以ubuntu为例。
1. 安装debootstrap
apt-get install debootstrap
2. 创建基本系统
debootstrap --arch=i386 trusty /home/thm/docker/min_os/ubuntu_i386/ http://archive.ubuntu.com/ubuntu
arch后跟的是硬件架构名称，可以是：amd64, armel, armhf, i386, ia64, mips, mipsel, powerpc, s390, s390x, sparc等。
"/home/thm/docker/min_os/ubuntu_i386/"是我存放ubuntu文件系统的地方，此目录可以根据实际情况修改。
3. 创建文件系统镜像
cd /home/thm/docker/min_os/ubuntu_i386/
tar -c . | docker import - tanghuimin0713/ubuntu_i386
完成之后通过docker images命令可以看到刚才创建的image文件
root@ubuntu:/home/thm/docker/min_os/ubuntu_i386# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
tanghuimin0713/ubuntu_i386 latest ee57f53fe012 About a minute ago 216.8 MB
ubuntu 14.04.1 c4ff7513909d 8 days ago 225.4 MB
ubuntu latest c4ff7513909d 8 days ago 225.4 MB
ubuntu 14.04 c4ff7513909d 8 days ago 225.4 MB
ubuntu trusty c4ff7513909d 8 days ago 225.4 MB
4. 修改basic image的tag
docker tag ee57f53fe012 tanghuimin0713/ubuntu_i386:14.04
ee57f53fe012是image id，tanghuimin0713/ubuntu_i386:14.04是respository名:tag名
root@ubuntu:/home/thm/docker/min_os/ubuntu_i386# docker tag ee57f53fe012 tanghuimin0713/ubuntu_i386:14.04
root@ubuntu:/home/thm/docker/min_os/ubuntu_i386#
root@ubuntu:/home/thm/docker/min_os/ubuntu_i386# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
tanghuimin0713/ubuntu_i386 latest ee57f53fe012 6 minutes ago 216.8 MB
tanghuimin0713/ubuntu_i386 14.04 ee57f53fe012 6 minutes ago 216.8 MB
ubuntu latest c4ff7513909d 8 days ago 225.4 MB
ubuntu 14.04 c4ff7513909d 8 days ago 225.4 MB
ubuntu 14.04.1 c4ff7513909d 8 days ago 225.4 MB
ubuntu trusty c4ff7513909d 8 days ago 225.4 MB
5. 将新建的basic image上传到docker hub中共享
docker push tanghuimin0713/ubuntu_i386
root@ubuntu:/home/thm/docker/min_os/ubuntu_i386# docker push tanghuimin0713/ubuntu_i386
The push refers to a repository (len: 2)
Sending image list
Pushing repository tanghuimin0713/ubuntu_i386 (2 tags)
ee57f53fe012: Pushing [======================================> ] 176.8 MB/232.1 MB 4m0s
备注：要想把自制的image文件上传到docker hub中与全世界的开发者共享需要先在docker hub中注册一个帐号，上传命令是docker push 用户名/image名。下图是我在docker hub的账户界面：
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