old：

auto lo

iface lo inet loopback

auto eth1

iface eth1 inet static

       address 10.0.13.13

       netmask 255.255.255.0

auto br0

       iface br0 inet static

       address 1.1.1.1

       netmask 255.255.255.0

       gateway 1.1.1.1

       bridge_ports eth0

       bridge_stp off

       bridge_fd 0

       bridge_maxwait 0

       dns-nameservers 202.106.0.20 202.106.196.115

       post-up for i in `virsh list | grep running| awk ‘{print $2}‘|tr "\n" " " `;do brctl show | grep $i >/dev/null; [ "$?" != "0" ] && brctl addif br0 $i;done

new：

auto lo

iface lo inet loopback

auto br1

       iface br1 inet static

       address 10.0.13.13

       netmask 255.255.255.0

       bridge_ports eth1

       bridge_stp off

       bridge_fd 0

       bridge_maxwait 0

       dns-nameservers 202.106.0.20 202.106.196.115

auto br0

       iface br0 inet static

       address 1.1.1.1

       netmask 255.255.255.0

       gateway 1.1.1.1

       bridge_ports eth0

       bridge_stp off

       bridge_fd 0

       bridge_maxwait 0

       dns-nameservers 202.106.0.20 202.106.196.115

#       post-up for i in `virsh list | grep running| awk ‘{print $2}‘|tr "\n" " " `;do brctl show | grep $i >/dev/null; [ "$?" != "0" ] && brctl addif br0 $i;done

       post-up for i in `virsh list | grep running| awk ‘{print $2}‘|tr "\n" " " `;do brctl show | grep $i >/dev/null; [ "$?" != "0" ] && brctl addif br0 $i;brctl addif br1 ${i}-2;done

less a.sh

#!/bin/bash

cp /etc/network/interfaces /etc/network/interfacesbak

netmasknum=`grep -i -n "netmask" /etc/network/interfaces | awk -F : ‘{print $1}‘|grep -v $(($(grep -i -n "gateway" /etc/network/interfaces|awk -F : ‘{print $1}‘)-1))`

wangkaming=`head -n $(($netmasknum-3)) /etc/network/interfaces|tail -n 1| awk ‘{print $2}‘`

wangkaip=`head -n $(($netmasknum-1)) /etc/network/interfaces | tail -n 1 | awk ‘{print $2}‘`

totalnum=`grep -n -i "post-up" /etc/network/interfaces | awk -F : ‘{print $1}‘`

sed -i `expr $netmasknum + 1`a"auto br1" /etc/network/interfaces

sed -i `expr $netmasknum + 2`a"\\\tiface br1 inet static" /etc/network/interfaces

sed -i `expr $netmasknum + 3`a"\\\taddress ${wangkaip}" /etc/network/interfaces

sed -i `expr $netmasknum + 4`a"\\\tnetmask 255.255.255.0" /etc/network/interfaces

sed -i `expr $netmasknum + 5`a"\\\tbridge_ports ${wangkaming}" /etc/network/interfaces

sed -i `expr $netmasknum + 6`a"\\\tbridge_stp off" /etc/network/interfaces

sed -i `expr $netmasknum + 7`a"\\\tbridge_fd 0" /etc/network/interfaces

sed -i `expr $netmasknum + 8`a"\\\tbridge_maxwait 0" /etc/network/interfaces

sed -i `expr $netmasknum + 9`a"\\\tdns-nameservers 202.106.0.20 202.106.196.115" /etc/network/interfaces

sed -i `expr $netmasknum + 10`a"\\\t" /etc/network/interfaces

sed -i ‘s/\(.*post-up.*\)/#\1/‘ /etc/network/interfaces

sed -i "$(($netmasknum-3)),${netmasknum}d" /etc/network/interfaces

sed -i "s#.*dns-nameservers.*#\\tdns-nameservers 202.106.0.20 202.106.196.115#g" /etc/network/interfaces

cat >> /etc/network/interfaces << "EOF"

       post-up for i in `virsh list | grep running| awk ‘{print $2}‘|tr "\n" " " `;do brctl show | grep $i >/dev/null; [ "$?" != "0" ] && brctl addif br0 $i;brctl addif br1 ${i}-2;done

EOF

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