1、問(wèn)題描述

???CentOS 8重啟后網(wǎng)卡不見(jiàn)了，也無(wú)法上網(wǎng)。

2、嘗試用nmcli connection up ens160命令修復(fù)，提示?unmanaged

[root@compute02 network-scripts]# nmcli connection up ens160

Error: Connection activation failed: No suitable device found for this connection (device lo not available because device is strictly unmanaged).

3、通過(guò)nmcli device status 命令查詢(xún)了一下設(shè)備狀態(tài)，為unmanaged

[root@compute02 network-scripts]# nmcli device status?

DEVICE? TYPE? ? ? STATE? ? ? CONNECTION?

virbr0? bridge? ? unmanaged? --? ? ? ? ?

ens160? ethernet? unmanaged? --? ? ? ? ?

ens192? ethernet? unmanaged? --? ? ? ? ?

lo? ? ? loopback? unmanaged? --? ? ? ? ?

4、確定NetworkManager是否已接管了系統(tǒng)的網(wǎng)絡(luò)連接管理，發(fā)現(xiàn)是disabled?

[root@compute02 network-scripts]# nmcli networking?

disabled

5、手動(dòng)開(kāi)啟，問(wèn)題解決

[root@compute02 network-scripts]# nmcli networking on

[root@compute02 network-scripts]# ping www.baidu.com

PING www.a.shifen.com (14.119.104.254) 56(84) bytes of data.

64 bytes from 14.119.104.254 (14.119.104.254): icmp_seq=1 ttl=50 time=20.8 ms

64 bytes from 14.119.104.254 (14.119.104.254): icmp_seq=2 ttl=50 time=20.2 ms

64 bytes from 14.119.104.254 (14.119.104.254): icmp_seq=3 ttl=50 time=19.9 ms

64 bytes from 14.119.104.254 (14.119.104.254): icmp_seq=4 ttl=50 time=20.0 ms