CFSDN坚持开源创造价值，我们致力于搭建一个资源共享平台，让每一个IT人在这里找到属于你的精彩世界.

这篇CFSDN的博客文章CentOS6.3 KVM如何设置网卡为桥接模式由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

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>  [/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 。

最后此篇关于CentOS6.3 KVM如何设置网卡为桥接模式的文章就讲到这里了,如果你想了解更多关于CentOS6.3 KVM如何设置网卡为桥接模式的内容请搜索CFSDN的文章或继续浏览相关文章，希望大家以后支持我的博客！ 。