CentOS6.3 KVM如何设置网卡为桥接模式(centos7.6安装kvm)

编辑：rootadmin

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复制代码代码如下: # cat /etc/libvirt/qemu/networks/default.xml <network> <name>default</name> <uuid>1f---adcf-6bf6acac</uuid> <bridge name="virbr0" /> <mac address=':::F1:6B:6E'/> <forward/> <ip address="...1" netmask="...0"> <dhcp> <range start="...2" end="..." /> </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/ubuntu..xml  <domain type='kvm'> <name>ubuntu.</name> <uuid>2eeb-a2-a-4da3-fba1df</uuid> <memory unit='KiB'></memory> <currentMemory unit='KiB'></currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x_' 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/ubuntu..img'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x' bus='0x' slot='0x' 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='0x' bus='0x' slot='0x' function='0x2'/> </controller> <controller type='ide' index='0'> <address type='pci' domain='0x' bus='0x' slot='0x' function='0x1'/> </controller> <interface type='bridge'> 原来是interface type='default' <mac address=':::::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='0x' bus='0x' slot='0x' 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='0x' bus='0x' slot='0x' function='0x0'/> </sound> <video> <model type='cirrus' vram='' heads='1'/> <address type='pci' domain='0x' bus='0x' slot='0x' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x' bus='0x' slot='0x' function='0x0'/> </memballoon> </devices> </domain> [/code] 3，改完之后要更新一下配置文件 # virsh define ubuntu..xml 定义域 ubuntu.（从 ubuntu..xml） #然后就可以virsh start ubuntu.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 # 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.. saved.ifcfg-em3.. saved.ifcfg-em2.. saved.ifcfg-em4.. 看下ifceg-em1 # cat ifcfg-em1 DEVICE="em1" #BOOTPROTO=none NM_CONTROLLED="yes" ONBOOT=yes TYPE="Ethernet" #UUID="3bc7fdcc-b1--b-ec8" #IPADDR... PREFIX= GATEWAY=... DNS1=...5 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System em1" HWADDR=:B1:1C::4D:A5 BRIDGE=br1 看下ifcfg-br1 # cat ifcfg-br1 DEVICE="br1" BOOTPROTO=none NM_CONTROLLED="yes" ONBOOT=yes #UUID="3bc7fdcc-b1--b-ec8" IPADDR=... PREFIX= GATEWAY=... DNS1=...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 :B1:1C::4D:A5 inet addr:... Bcast:... Mask:...0 inet6 addr: fe::b1:1cff:fe:4da5/ Scope:Link UP BROADCAST RUNNING MULTICAST MTU: Metric:1 RX packets: errors:0 dropped:0 overruns:0 frame:0 TX packets: errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes: (.5 KiB) TX bytes: (.1 MiB) em1 Link encap:Ethernet HWaddr :B1:1C::4D:A5 inet6 addr: fe::b1:1cff:fe:4da5/ Scope:Link UP BROADCAST RUNNING MULTICAST MTU: Metric:1 RX packets: errors:0 dropped:0 overruns:0 frame:0 TX packets: errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen: RX bytes: (.7 KiB) TX bytes: (.7 MiB) Interrupt: lo Link encap:Local Loopback inet addr:.0.0.1 Mask:.0.0.0 inet6 addr: ::1/ Scope:Host UP LOOPBACK RUNNING MTU: Metric:1 RX packets: errors:0 dropped:0 overruns:0 frame:0 TX packets: errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes: (.5 MiB) TX bytes: (.5 MiB) virbr0 Link encap:Ethernet HWaddr :::F1:6B:6E inet addr:...1 Bcast:... Mask:...0 UP BROADCAST RUNNING MULTICAST MTU: Metric:1 RX packets: errors:0 dropped:0 overruns:0 frame:0 TX packets: errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes: (.8 KiB) TX bytes: (.2 KiB) vnet0 Link encap:Ethernet HWaddr FE:::::7E inet6 addr: fe::fc:ff:fe:e/ Scope:Link UP BROADCAST RUNNING MULTICAST MTU: Metric:1 RX packets: errors:0 dropped:0 overruns:0 frame:0 TX packets: errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen: RX bytes: (.1 KiB) TX bytes: (.7 KiB) vnet1 Link encap:Ethernet HWaddr FE:::B5:1A: inet6 addr: fe::fc:ff:feb5:1a/ Scope:Link UP BROADCAST RUNNING MULTICAST MTU: Metric:1 RX packets: errors:0 dropped:0 overruns:0 frame:0 TX packets: errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen: RX bytes: (8.5 KiB) TX bytes: (.2 KiB) 5,启动虚拟机ubuntu.后配置网卡 #cat /etc/network/interface auto lo iface lo inet loopback auto eth0 iface eth0 inet static address ... netmask ...0 gateway ... #/etc/init.d/networking restart 启动即可

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