第一部分：安装
1.查看系统版本：cat /etc/redhat-release
2.安装：yum install docker
3.检查是否成功：docker version
4.启动docker：
systemctl start docker.service
systemctl enable docker.service
5.查看docker信息：docker info
第二部分：使用
1.检索名字为tutorial的镜像：docker search tutorial
2.下载镜像：docker install learn/tutorial
3.查看下载的镜像：docker images
4.在docker中运行hello world：docker run learn/tutorial echo "hello world"
说明：*docker run命令有两个参数，一个是镜像名，一个是要在镜像中运行的命令 *
5.在docker中安装wget命令：docker run learn/tutorial apt-get install -y wget
6.查看容器Id：docker ps -l
[root@host-10-10-10-12 ~]# docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1ced4f9a977b learn/tutorial "apt-get install -y w" About a minute ago Exited (0) 58 seconds ago tender_murdock
7.保存对容器的修改并命名为learn/wget：docker commit 1ced4f9a977b learn/wget
[root@host-10-10-10-12 ~]# docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1ced4f9a977b learn/tutorial "apt-get install -y w" About a minute ago Exited (0) 58 seconds ago tender_murdock
8.检查运行中的镜像：docker inspect a7953f439817
