CentOS7的docker下载下来启动失败问题（Job for docker.service failed because the control process exited with）的解决方案

会出现的错误：Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.linux 若是忽略错误进行操做，就会出现：docker Cannot conn

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