目前红帽RHEL系统下面安装docker可以有两种方式：一种是使用curl获得docker的安装脚本进行安装，还有一种是使用yum包管理器来安装docker。

一、使用安装脚本安装。

备注：你可以按照同样的步骤在CentOS系统下面安装docker。

1. 使用一个有sudo权限的帐号登录红帽系统。

2. 更新现有的yum包。

   $ sudo yum 
                     update 

3. 执行docker安装脚本。

   $ curl -sSL http
                 s://
                 get.docker.
                 com/ | 
                 sh 

4. 启动docker服务。

             $ sudo service docker start

5. 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/

二、使用yum包安装

1. 使用有sudo权限的帐号登录系统。

2. 更新yum包。

   $ sudo yum 
   update 

3. 添加docker源。

   $ cat >/etc/yum
   .repos.d/docker
   .repo <<-EOF
   [dockerrepo]
   name=Docker Repository
   baseurl=https:
   //yum.dockerproject.org/repo/main/centos/7 enabled=
   1 gpgcheck=
   1 gpgkey=https:
   //yum.dockerproject.org/gpg EOF

4. 使用yum命令安装docker。

   $ sudo yum 
   install docker-
   engine 

5. 启动docker服务。

   $ sudo service docker start

6. 确认docker是否安装成功。

   $ sudo docker 
   run hello-world