centos7使用docker1.8.2

1. yum install docker-io或curl -sSL https://get.daocloud.io/docker | sh

2. service docker start

   如果出现
   [root@localhost 桌面]# service docker start
   Starting docker (via systemctl):  Job for docker.service failed. See 'systemctl status docker.service' and 'journalctl -xn' for details. [失败]
   
   则有可能是防火墙开启的原因，可先关闭防火墙：
   service firewalld stop
   

3. docker run hello-world

   出现错误
   “Cannot connect to the Docker daemon. Is 'docker -d' running on this host?”
   
   网上找到解决方式：http://blog.youkuaiyun.com/xu470438000/article/details/43704469
   
   执行：yum upgrade device-mapper-libs
   

4. 再次执行：docker run hello-world

        INFO[0211] POST /v1.19/containers/create                
   ERRO[0211] Handler for POST /containers/create returned error: No such image: hello-world (tag: latest) 
   ERRO[0211] HTTP Error                                    err=No such image: hello-world (ta