CentOS6.3 KVM下设置网卡为桥接模式
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 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