安装并启动一个Docker容器

yum install docker//安装docker
service docker start //启动docker
docker run hello-world//创建一个新的容器

运行成功会有如下的信息，1.2.3.4步骤说明了启动一个docker容器经历的过程

1：docker客户端连接docker服务端
2：docker服务端在docker hub 中拉取hello-world镜像
3：docker服务端创建一个容器，这个容器是根据拉下来的镜像启动的一个容器，这个容器执行了我们看到的这段信息的一个脚本
4：docker服务端把信息流返回到客户端，客户端将这些信息返回到你的终端

[root@ip-10-0-0-45 ec2-user]# docker run hello-world

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.
    (amd64)
 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

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/