近日，想着给自己充实下，准备学习下容器云的部署玩玩，那就从第一步开始吧，搞个docker来亲自玩玩

下面是安装教程

系统环境：centos7.2 62位 

1、更新现有的yum包。
$ sudo yum update 
2、执行docker安装脚本。
$ curl -sSL https://get.docker.com/ | sh 
3、启动docker服务。
$ sudo service docker start
4、确认docker安装成功。
$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from hello-world
a8219747be10: Pull complete 91c95931e552: Already exists 
hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security. Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd1.7.1cf5daeb82aab55838d
Status: Downloaded newer image for hello-world:latest
Hello from Docker.
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
        (Assuming it was not already locally available.) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash
For more examples and ideas, visit: http://docs.docker.com/userguide/

root@souyunku:~# sudo docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              f2a91732366c        7 weeks ago         1.85kB