遇到报错：(device lo not available because device is strictly unmanaged)
nmcli device status 查看设备状态
nmcli connection show状态为unmanaged
[root@192~]# nmcli connection show
NAME UUID TYPE DEVICE
ens160 cf32e4bc-eaf9-3db0-98bb-2879bd5153d8 ethernet --
尝试修复，出现device is strictly unmanaged报错
[root@192~]# nmcli connection up ens33
Error: Connection activation failed: No suitable device found for this connection (device lo not available because device is strictly unmanaged).
[root@192~]# nmcli device up ens33
Error: Failed to add/activate new connection: Connection 'ens33' is not available on device ens160 because device is strictly unmanaged
[root@192~]# nmcli device set ens33 managed yes
[root@192~]# nmcli device status
尝试restart和reload NetworkManager.service均无效
[root@192~]# systemctl reload NetworkManager.service
解决办法：
我的解决办法是
确定NetworkManager是否已接管了系统的网络连接管理
[root@192~]# nmcli networking
disabled
若没有解决则需要手动开启接管
[root@192~]# nmcli networking on
接管后恢复正常
[root@192~]# nmcli connection show
NAME UUID TYPE DEVICE
ens33 cf32e4bc-eaf9-3db0-98bb-2879bd5153d8 ethernet ens33
[root@192~]# nmcli device status
DEVICE TYPE STATE CONNECTION
ens33 ethernet connected ens33