一、问题：登录linux输入ifconfig, ether 00:0c:29:8f:a8:72

ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 00:0c:29:55:f5:0b  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

二、解决方式

重启红框里面的服务

使用reboot重启Linux。

reboot

再次使用 ifconfig 查看还是失败。

[master@localhost ~]$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 00:0c:29:55:f5:0b  txqueuelen 1000  (Ethernet)
        RX packets 48  bytes 4912 (4.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 73  bytes 8466 (8.2 KiB)
        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
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 304  bytes 26384 (25.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 304  bytes 26384 (25.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:17:39:86  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

最后发现因为虚拟机IP模式是dhcp而不是static，dhcp只有在联网时才会有IPV4分发的IP。