CentOS7 Failed to start LSB: Bring up/down networking. 已解決！！！

  執行 service network restart 出現以下錯誤 Restarting network (via systemctl):  Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.     嘗試了好多種方法終於徹底解決掉了。

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