kvm 给虚机增加网卡

[root@666 ok]# virsh domiflist c03
Interface  Type       Source     Model       MAC
-------------------------------------------------------
vnet1      bridge     br0        rtl8139     52:54:00:cf:e1:a3

[root@666 ok]# virsh list
 Id    Name                           State
----------------------------------------------------
 1     c01                            running
 2     c03                            running
 3     c70                            running

[root@666 ok]# virsh attach-interface c03 --type bridge --source br0
Interface attached successfully
查看:
[root@666 ok]# virsh domiflist c03
Interface  Type       Source     Model       MAC
-------------------------------------------------------
vnet1      bridge     br0        rtl8139     52:54:00:cf:e1:a3
vnet3      bridge     br0        rtl8139     52:54:00:7e:c2:6a
[root@c03 conf]# 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:cf:e1:a3 brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.61/24 brd 10.100.0.255 scope global eth0
    inet6 fe80::5054:ff:fecf:e1a3/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 52:54:00:2b:9e:6c brd ff:ff:ff:ff:ff:ff

[root@666 ok]# virsh dumpxml c03 >/etc/libvirt/qemu/c03.xml 
[root@666 ok]# virsh define /etc/libvirt/qemu/c03.xml 
Domain c03 defined from /etc/libvirt/qemu/c03.xml

[root@c03 ~]# 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:cf:e1:a3 brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.61/24 brd 10.100.0.255 scope global eth0
    inet6 fe80::5054:ff:fecf:e1a3/64 scope link 
       valid_lft forever preferred_lft forever
3: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 52:54:00:7e:c2:6a brd ff:ff:ff:ff:ff:ff

[root@c03 network-scripts]# cp ifcfg-eth0 ifcfg-eth2^C
[root@c03 network-scripts]# pwd
/etc/sysconfig/network-scripts
[root@c03 network-scripts]# cp ifcfg-eth0 ifcfg-eth2
配改MAC并查看:
  DEVICE=eth0                                                         |  DEVICE=eth2                                                        
  HWADDR=52:54:00:CF:E1:A3                                            |  HWADDR=52:54:00:7e:c2:6a                                           
  TYPE=Ethernet                                                       |  TYPE=Ethernet
  UUID=4edbb7bf-e64f-402a-854c-ff259250c497                           |  #UUID=4edbb7bf-e64f-402a-854c-ff259250c497                         
  ONBOOT=yes                                                          |  ONBOOT=yes
  NM_CONTROLLED=yes                                                   |  NM_CONTROLLED=yes
  BOOTPROTO=dhcp                                                      |  BOOTPROTO=dhcp

[root@c03 network-scripts]# 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:cf:e1:a3 brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.61/24 brd 10.100.0.255 scope global eth0
    inet6 fe80::5054:ff:fecf:e1a3/64 scope link 
       valid_lft forever preferred_lft forever
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:7e:c2:6a brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.58/24 brd 10.100.0.255 scope global eth2
    inet6 fe80::5054:ff:fe7e:c26a/64 scope link 
       valid_lft forever preferred_lft forever

# 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:cf:e1:a3 brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.61/24 brd 10.100.0.255 scope global eth0
    inet6 fe80::5054:ff:fecf:e1a3/64 scope link 
       valid_lft forever preferred_lft forever
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:7e:c2:6a brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.58/24 brd 10.100.0.255 scope global eth2
    inet6 fe80::5054:ff:fe7e:c26a/64 scope link 
       valid_lft forever preferred_lft forever
[root@666 ok]# virsh detach-interface c03 --type bridge --mac 52:54:00:7e:c2:6a
Interface detached successfully
查看IP
# 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:cf:e1:a3 brd ff:ff:ff:ff:ff:ff
    inet 10.100.0.61/24 brd 10.100.0.255 scope global eth0
    inet6 fe80::5054:ff:fecf:e1a3/64 scope link 
       valid_lft forever preferred_lft forever
再次保存配置文件:
[root@666 ok]# virsh dumpxml c03 >/etc/libvirt/qemu/c03.xml 
[root@666 ok]# virsh define /etc/libvirt/qemu/c03.xml 
Domain c03 defined from /etc/libvirt/qemu/c03.xml