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

  执行 service network restart 出现以下错误 Restarting network (via systemctl):  Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.     尝试了好多种方法终于彻底解决掉了。

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