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在线添加网卡

查看原有网卡信息

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$ virsh domiflist snale
Interface  Type       Source     Model       MAC
-------------------------------------------------------
vnet0      bridge     br0        virtio      52:54:00:8c:b8:60

临时添加新网卡

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virsh attach-interface snale --type bridge --source br0 
# 成功附加接口

永久添加网卡命令

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virsh attach-interface snale --type bridge --source br0  --config

查看

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$ virsh domiflist snale
Interface  Type       Source     Model       MAC
-------------------------------------------------------
vnet0      bridge     br0        virtio      52:54:00:8c:b8:60
vnet1      bridge     br0        -           52:54:00:14:86:cf

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:8c:b8:60 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.23/24 brd 192.168.0.255 scope global eth0
    inet6 fe80::5054:ff:fe8c:b860/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 52:54:00:14:86:cf brd ff:ff:ff:ff:ff:ff

命令行增加的网卡只保存在内存中，重启就失效，所以需要保存到配置文件中

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virsh dumpxml snale >/etc/libvirt/qemu/snale.xml 
virsh define /etc/libvirt/qemu/snale.xml

删除网卡命令

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virsh detach-interface snale  --type bridge --mac  52:54:00:14:86:cf

成功分离接口，在重新保存配置