CentOS6.3 KVM如何设置网卡为桥接模式

复制代码

代码如下:

# 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>

[/code]

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

4，物理网卡可以手动更改，不过现在有现成的工具包，可以用这个更改

#wget http://www.convirture.com/downloads/convirture-tools/2.0.1/convirture-tools-2.0.1.tar.gz

# tar zxvf convirture-tools-2.0.1.tar.gz

# /root/convirture-tools/install/managed_server/scripts/convirt-tool –bridge setup

我的这里出现了点小问题，发现网络没起来，所以不要远程来做这个操作，主要原因是里面的配置文件有点需要

小的更改，我的是UUID注释了。

# ls ifcfg-*

ifcfg-br1 ifcfg-br2 ifcfg-br3 ifcfg-br4 ifcfg-em1 ifcfg-em2 ifcfg-em3 ifcfg-em4 ifcfg-lo

我这里有四个物理网卡，所以生成了四个bridge,不过真实用的只有br1

这个工具好有一个好处就是保存了原配置文件，如果你不想用时还可以还原

# ls saved.ifcfg-em*

saved.ifcfg-em1.20121128.101114 saved.ifcfg-em3.20121128.101114

saved.ifcfg-em2.20121128.101114 saved.ifcfg-em4.20121128.101114

看下ifceg-em1

# cat ifcfg-em1

DEVICE="em1"

#BOOTPROTO=none

NM_CONTROLLED="yes"

ONBOOT=yes

TYPE="Ethernet"

#UUID="3bc7fdcc-42b1-4223-b202-e697305897c8"

#IPADDR172.16.10.81

PREFIX=24

GATEWAY=172.16.10.254

DNS1=172.16.10.5

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

NAME="System em1"

HWADDR=90:B1:1C:20:4D:A5

BRIDGE=br1

看下ifcfg-br1

# cat ifcfg-br1

DEVICE="br1"

BOOTPROTO=none

NM_CONTROLLED="yes"

ONBOOT=yes

#UUID="3bc7fdcc-42b1-4223-b202-e697305897c8"

IPADDR=172.16.10.81

PREFIX=24

GATEWAY=172.16.10.254

DNS1=172.16.10.5

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

NAME="System br1"

TYPE=Bridge

最后看下网卡

# ifconfig

br1 Link encap:Ethernet HWaddr 90:B1:1C:20:4D:A5

inet addr:172.16.10.81 Bcast:172.16.10.255 Mask:255.255.255.0

inet6 addr: fe80::92b1:1cff:fe20:4da5/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:10219 errors:0 dropped:0 overruns:0 frame:0

TX packets:3776 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:576031 (562.5 KiB) TX bytes:15928008 (15.1 MiB)

em1 Link encap:Ethernet HWaddr 90:B1:1C:20:4D:A5

inet6 addr: fe80::92b1:1cff:fe20:4da5/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:10362 errors:0 dropped:0 overruns:0 frame:0

TX packets:13131 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:766684 (748.7 KiB) TX bytes:16489098 (15.7 MiB)

Interrupt:35

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:144411 errors:0 dropped:0 overruns:0 frame:0

TX packets:144411 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:147381248 (140.5 MiB) TX bytes:147381248 (140.5 MiB)

virbr0 Link encap:Ethernet HWaddr 52:54:00:F1:6B:6E

inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:2028 errors:0 dropped:0 overruns:0 frame:0

TX packets:1135 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:233311 (227.8 KiB) TX bytes:89372 (87.2 KiB)

vnet0 Link encap:Ethernet HWaddr FE:54:00:50:58:7E

inet6 addr: fe80::fc54:ff:fe50:587e/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:161 errors:0 dropped:0 overruns:0 frame:0

TX packets:3117 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:500

RX bytes:15533 (15.1 KiB) TX bytes:263947 (257.7 KiB)

vnet1 Link encap:Ethernet HWaddr FE:54:00:B5:1A:19

inet6 addr: fe80::fc54:ff:feb5:1a19/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:56 errors:0 dropped:0 overruns:0 frame:0

TX packets:794 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:500

RX bytes:8754 (8.5 KiB) TX bytes:42245 (41.2 KiB)

5,启动虚拟机ubuntu10.04后配置网卡

#cat /etc/network/interface

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet static

address 172.16.10.100

netmask 255.255.255.0

gateway 172.16.10.254

#/etc/init.d/networking restart

启动即可