docker error Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?

用docker composer启动docker集群时报错:

ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?

应该是docker后台服务没有开启

Ubuntu上的解决办法:http://blog.csdn.net/kongxx/article/details/43481573#comments

CentOS7上的解决办法:https://docs.docker.com/articles/systemd/

我在centos7环境,直接执行

systemctl start docker
再次启动docker集群,问题解决

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