CentOS6.3 KVM下设置网卡为桥接模式

KVM的默认网络模式为NAT，就是说借助宿主机模式上网，现在我们想改成桥接模式，这样外界就可以直接和宿主机里的虚拟机通讯了。

1，首先看一下默认的网络设置
# cat /etc/libvirt/qemu/networks/default.xml
<network>
<name>default</name>
<uuid>1f118032-0345-4725-adcf-6b94f6aca19c</uuid>
<bridge name="virbr0" />
<mac address="52:54:00:F1:6B:6E"/>
<forward/>
<ip address="192.168.122.1" netmask="255.255.255.0">
<dhcp>
<range start="192.168.122.2" end="192.168.122.254" />
</dhcp>
</ip>
</network>

2，再看一下虚拟机配置文件里面的网络设置
#cat /etc/libvirt/qemu/Ubuntu10.04.xml
<！--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh edit ubuntu10.04
or other application using the libvirt API.
-->

<domain type="kvm">
<name>ubuntu10.04</name>
<uuid>2eeb1395-39a2-a169-4da3-f22b20a1d34f</uuid>
<memory unit="KiB">1048576</memory>
<currentMemory unit="KiB">1048576</currentMemory>
<vcpu placement="static">1</vcpu>
<os>
<type arch="x86_64" machine="rhel6.3.0">hvm</type>
<boot dev="hd"/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset="utc"/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type="file" device="disk">
<driver name="qemu" type="raw" cache="none"/>
<source file="/var/lib/libvirt/images/ubuntu10.04.img"/>
<target dev="vda" bus="virtio"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x0"/>
</disk>
<disk type="block" device="cdrom">
<driver name="qemu" type="raw"/>
<target dev="hdc" bus="ide"/>
<readonly/>
<address type="drive" controller="0" bus="1" target="0" unit="0"/>
</disk>
<controller type="usb" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x2"/>
</controller>
<controller type="ide" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x1"/>
</controller>
<interface type="bridge"> 原来是interface type="default"
<mac address="52:54:00:50:58:7e"/>
<source bridge="br1"/> 原来是source network="default",这里的br1要根据你的物理网卡下面有讲
<model type="virtio"/>
<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"/>
</console>
<input type="mouse" bus="ps2"/>
<graphics type="vnc" port="-1" autoport="yes"/>
<sound model="ich6">
<address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/>
</sound>
<video>
<model type="cirrus" vram="9216" heads="1"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
</video>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x00" slot="0x06" function="0x0"/>
</memballoon>
</devices>
</domain>

3，改完之后要更新一下配置文件

# virsh define ubuntu10.04.xml
定义域 ubuntu10.04（从 ubuntu10.04.xml）
#然后就可以virsh start ubuntu10.04了，不过现在物理网卡这块还没有改好

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