前言
kvm默认生成的网段是192.168.122.0/24。假如内网已经有了一个网段192.168.122.0/24，这个时候就需要进行修改。而我秉着学习的态度来学习修改。
了解virbr0的配置文件
virbr0 部署kvm的时候生成。
vim /etc/libvirt/qemu/networks/default.xml
<network>
<name>default</name>
<uuid>d63fbb69-44f0-4f7a-a001-af50092204e8</uuid>
<forward mode='nat'/>
<bridge name='virbr0' stp='on' delay='0'/>
<mac address='52:54:00:36:44:41'/>
<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>
修改配置文件并生效配置文件
#修改配置文件
sed -i 's/192.168.122/192.168.8/g' /etc/libvirt/qemu/networks/default.xml
#定义网络
virsh net-define /etc/libvirt/qemu/network/default.xml
#停止default网络
virsh net-destroy default
#启动default网络
virsh net-start default
#重启libvirtd
systemctl restart libvirtd
验证
修改后结果
拓展
新建一个virbr1
创建配置文件
vim /etc/libvirt/qemu/networks/10.10.10.0.xml
<network>
<name>10.10.10.0</name>
<uuid>c346aecb-f9f5-4ba8-80f7-30089cea3a36</uuid>
<forward mode='nat'/>
<bridge name='virbr1' stp='on' delay='0'/>
<mac address='52:54:01:36:44:41'/>
<ip address='10.10.10.1' netmask='255.255.255.0'>
<dhcp>
<range start='10.10.10.2' end='10.10.10.254'/>
</dhcp>
</ip>
</network>
启动网卡
virsh net-define /etc/libvirt/qemu/networks/10.10.10.0.xml
virsh net-start 10.10.10.0
virsh net-list
验证
验证创建的网卡
该网卡
但是你该如何去引用该网卡呢？
修改network调用
<interface type='network'>
<mac address='52:76:53:f4:64:a6'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
该文件在哪里呢？
virsh edit 你需要的修改的网络的机器名称
或者：
你自己写的kvm的xml文件。
粘贴一个配置文件
<!--
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 MUBAN
or other application using the libvirt API.
-->
<domain type='kvm'>
<name>dnsServer</name>
<uuid>47725179-0e37-41b0-9895-282da80b8aea</uuid>
<memory unit='KiB'>2048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact' check='partial'>
<model fallback='allow'>SandyBridge-IBRS</model>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/opt/images/dnsServer.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:23:77:12:7B:0D'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='2'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes'>
<listen type='address'/>
<image compression='off'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='3'/>
</redirdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/urandom</backend>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
</rng>
</devices>
</domain>
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