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Starting docker (via systemctl): Job for docker.service failed. See ‘systemctl status docker.service‘ and ‘journalctl -xn‘ for details.
[FAILED]
解决办法：
Docker 启动失败Starting docker (via systemctl): Job for docker.service failed
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原文地址：http://www.cnblogs.com/wawahaha/p/4926631.html
yum install device-mapper-develfixed this for me.Using the default configuration of the latest docker 1.8.0 release, systemd can‘t start docker.
Workaround:
yum install docker-selinux参考：https://github.com/docker/docker/issues/12108
https://github.com/docker/docker/issues/15498
http://dockone.io/article/620