docker_work_with_images
默认为root权限1、Listing images on the host
docker images
2、listing runing container
docker ps
3、get images
（1）、docker run -t -i ubuntu:14.04 /bin/sh #若local没有ubuntu14.04的image，能联网则会从 Docker Hub下载
（2）、docker pull ubuntu：14.04
（2）与（1）不同的是，pull会预先下载（Well Docker will automatically download any image we use that isn't
already present on the Docker host. But this can potentially add some time to the launch of a container.
If we want to pre-load an image we can download it using the docker pull command. Let's say we'd like
to download the centos image.）
总之，（1）登录到容器慢些（2）快些
（3）dockerfile
dockerfile 一般为
FROM baseimage
MAINTAINER kate smith <ksmith@example.com>
RUN ...
RUN ...
使用docker build -t name/space . #须在dockerfile所在目录下执行该命令，注意.的存在
4、updating and commiting an images
docker commit -m “message” -a "john" #-m version info -a author info
5、find images
docker search ubunte #从local和docker hub查找images
6、Setting tags on an image
你可以为commit or build 的image 设置tag
docker tag 5db5f8471261 ouruser/sinatra:devel
7、Push an image to Docker Hub
一旦你build or create image，你可以上传到docker Hub与别人share，你也可以上传到自己的private reposity。
docker push ouruser/sinatra
8、Remove an image from the host
从local删除image
docker rmi training/sinatra
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