CentOS7的docker下載下來啓動失敗問題（Job for docker.service failed because the control process exited with）的解決方案

會出現的錯誤：Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.linux 若是忽略錯誤進行操做，就會出現：docker Cannot conn

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