Failed to start LSB: Bring up/down networking. Centos7 使用过程中网卡突然消失，无法联网

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在CentOS7中，安装Kubernetes过程中遇到网络故障，表现为ifconfig后未发现网卡。问题源于network.service失败，具体错误为没有合适的设备用于连接。解决方法是通过nmcli启用网络管理器的托管功能，然后重启系统以恢复网络连接。

环境： centos7 虚拟机为 VM17 pro

问题描述：安装Kubernetes 过程中，发现网络突然消失，ifconfig过后发现网卡也没有了。

1、查看网络状态报错

systemctl status network.service

错误信息：

● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Thu 2023-03-30 17:41:30 PDT; 2min 24s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 807 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

Mar 30 17:41:30 localhost.localdomain systemd[1]: Starting LSB: Bring up/down networking...
Mar 30 17:41:30 localhost.localdomain network[807]: Bringing up loopback interface:  [  OK  ]
Mar 30 17:41:30 localhost.localdomain network[807]: Bringing up interface ens33:  Error: Connection activation failed: No suitable device found for this connection (device lo ...unmanaged).
Mar 30 17:41:30 localhost.localdomain network[807]: [FAILED]
Mar 30 17:41:30 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1
Mar 30 17:41:30 localhost.localdomain systemd[1]: Failed to start LSB: Bring up/down networking.
Mar 30 17:41:30 localhost.localdomain systemd[1]: Unit network.service entered failed state.
Mar 30 17:41:30 localhost.localdomain systemd[1]: network.service failed.
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