centos7使用docker1.8.2_a dependency job for docker.service failed. see 'j

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
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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.csdn.net/xu470438000/article/details/43704469

执行：yum upgrade device-mapper-libs
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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               
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