为KVM设置桥接网络

date: 2010-03-21 21:21:51

0.install the package bridge-utils

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yum install bridge-utils

Installed: bridge-utils

1.Stop the Ethernet device that you plan to create a bridge for using the ifdown command

1	ifdown eth0

2.configure a bridge. Create the file /etc/sysconfig/network-scripts/ifcfg-br0

vi /etc/sysconfig/network-scripts/ifcfg-br0

DEVICE=br0
BOOTPROTO=dhcp
TYPE=Bridge
ONBOOT=yes

3.Modify /etc/sysconfig/network-scripts/ifcfg-eth0

vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
#BOOTPROTO=DHCP
HWADDR=00:18:8B:48:D6:8B
ONBOOT=yes
BRIDGE=br0

4.Restart the network and run ifconfig to check

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/etc/init.d/network restart

ifconfig

5.Prepare the bridge for KVM

# Add a script to connect your guest instance to the bridge on guest boot
vi /etc/qemu-ifup

#!/bin/bash 
BRIDGE=$(/sbin/ip route list | awk '/^default / { print $NF }')
/sbin/ifconfig $1 0.0.0.0 up
/usr/sbin/brctl addif $BRIDGE $1
# END OF SCRIPT

# Silence a qemu warning by creating a noop qemu-ifdown script
vi /etc/qemu-ifdown

#!/bin/bash 
# END OF SCRIPT
chmod +x /etc/qemu-if*

6.Start VM

1 2	qemu-kvm -hda centos5x.img -m 512 -net nic,macaddr=00:16:3e:88:${INSTANCE}:00 -net tap