问题
Cent OS 8开机启动后网卡未正常启动，未显示网络连接，无网络连接选项
排查
[admin@localhost ~]$ ifconfig 讯享网
发现没有ens33网卡
讯享网[admin@localhost ~]$ ifconfig docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 02:42:da:73:b2:35 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1000 (Local Loopback) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 52:54:00:fe:d7:fc txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [admin@localhost ~]$
查看网卡信息
[admin@localhost ~]$ nmcli 
发现网卡NetworkManager（NM）没有被托管，disabled表示未托管，enabled为已托管
解决方法
讯享网[admin@localhost ~]$ nmcli n on
重启NetworkManager
[admin@localhost ~]$ systemctl restart NetworkManager 
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