kvm 虚拟机新增网卡

   <interface type='bridge'>
     <mac address='52:54:00:77:56:88'/>
     <source bridge='br0'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
   </interface>

  <interface type='bridge'>
     <mac address='52:54:00:77:56:8a'/>
     <source bridge='br1'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
   </interface>

   <serial type='pty'>
     <target port='0'/>
   </serial>
   <console type='pty'>
     <target type='serial' port='0'/>
"/etc/libvirt/qemu/vm2.xml" 75L, 2562C written

[root@ophost images]# virsh define /etc/libvirt/qemu/ctrixcacti.xml
错误：从 /etc/libvirt/qemu/ctrixcacti.xml 定义域失败
错误：XML error: Attempted double use of PCI Address '0:0:3.0'

粗体为新增的网卡，报错的原因是新增网卡2和网卡1的 slot冲突，将新网卡的0x03改为0x05即可

#virsh define /etc/libvirt/qemu/vm2.xml
定义域 ctrixcacti（从 /etc/libvirt/qemu/vm2.xml）