我听说 KVM 中的来宾操作系统和主机操作系统可以通过同一专用网络中的网络接口或 IP 地址进行通信。我也听到那
您可以在 ifconfig 的输出中看到容器和虚拟机网络中的 IP 地址和网络接口。
ifconfig我在下面显示了来宾操作系统和主机操作系统的输出。您能否告诉我来宾操作系统中的哪个网络接口或 IP 地址与主机操作系统中的哪个网络接口或 IP 地址相对应，反之亦然？谢谢。
在通过 VMM/KVM 的 Debian 来宾操作系统中，
user@debian:~$ /sbin/ifconfig
ens3: flags=4163<UP,BROADCAST,RUNNING,MULTICAS> mtu 1500
inet 192.168.122.202 netmask 255.255.255.0 broadcast 192.168.122.255
inet6 fe80::5054:ff:fe99:5eee prefixlen 64 scopeid 0x20<link>
ether 52:54:00:99:5e:ee txqueuelen 1000 (Ethernet)
RX packets 5504 bytes 4872073 (4.6 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4199 bytes 559987 (546.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 20044
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 1 (Local Loopback)
RX packets 488 bytes 39360 (38.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 488 bytes 39360 (38.4 KiB)
TX errors 0 dropped 0 overruns 0 carries 0 collisions 0
在 Lubuntu 主机操作系统中：
$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:a6:79:a6:bc 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
enp0s25: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 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
device interrupt 20 memory 0xfc400000-fc420000
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 3102389 bytes 174723039 (174.7 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3102389 bytes 174723039 (174.7 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:b1:aa:1f txqueuelen 1000 (Ethernet)
RX packets 708 bytes 68468 (68.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 316 bytes 51806 (51.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vnet0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::fc54:ff:fe99:5eee prefixlen 64 scopeid 0x20<link>
ether fe:54:00:99:5e:ee txqueuelen 1000 (Ethernet)
RX packets 257 bytes 28494 (28.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 23514 bytes 1240204 (1.2 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlx8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.97 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 prefixlen 64 scopeid 0x20<link>
ether 80:1f:02:b5:c3:89 txqueuelen 1000 (Ethernet)
RX packets 1269625 bytes 1045069752 (1.0 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 646600 bytes 101897054 (101.8 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
答案1
您的访客有一个非环回接口，ens3；这是它用来与主机通信的接口。在主机上，匹配的接口是同一网络中的接口，就是virbr0这里。如果您想列出属于网桥一部分的接口，请运行
brctl show virbr0
在主机上。
您还可以将访客中的路由与主机相匹配：访客的网关将是主机。要查看路线，请运行
ip route list
默认网关在“默认”行中给出，类似于
default via 192.168.122.1 dev ens3 proto static metric 100