<domain type='kvm'>

     虚拟机整体信息

     系统信息

     硬件资源特性

     突发事件处理

     虚拟磁盘（单个或多个）

     虚拟光盘（可选）

     虚拟网络（单个或多个）

     vnc/spice配置

 </domain>

 <domain type='kvm'>　　　　　　　　　　##描述hypervisor

   <name>centos7.</name>　　　　　　　　##定义虚拟机整体信息

   <uuid>c2d264d3-5c61-4d2e--b28673c1f64b</uuid>

   <memory unit='KiB'></memory>

   <currentMemory unit='KiB'></currentMemory>

   <vcpu placement='static'></vcpu>

   <os>　　　　　　　　　　　　　　　　　　##系统信息

     <type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>

     <boot dev='hd'/>　　　　　　##开机从哪里启动

   </os>

   <features>　　　　　　　　　　##硬件资源特性

     <acpi/>

     <apic/>

   </features>

   <cpu mode='custom' match='exact'>

     <model fallback='allow'>Haswell-noTSX</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>　　　　　　##突发事件处理

   <on_reboot>restart</on_reboot>

     <suspend-to-mem enabled='no'/>

     <suspend-to-disk enabled='no'/>

   </pm>

   <devices>　　　　　　　　　　　　　　　　##外设资源

     <emulator>/usr/libexec/qemu-kvm</emulator>

     <disk type='file' device='disk'>　　　　##描述虚拟磁盘image

       <driver name='qemu' type='qcow2'/>

       <source file='/var/lib/libvirt/images/centos7.0.qcow2'/>

       <target dev='vda' bus='virtio'/>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>

     </disk>

     <controller type='usb' index='' model='ich9-ehci1'>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/>

     </controller>

     <controller type='usb' index='' model='ich9-uhci1'>

       <master startport=''/>

     </controller>

     <controller type='usb' index='' model='ich9-uhci2'>

       <master startport=''/>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/>

     </controller>

     <controller type='usb' index='' model='ich9-uhci3'>

       <master startport=''/>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/>

     <controller type='virtio-serial' index=''>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>

     </controller>

     <interface type='bridge'>　　　　##虚拟网络，基于网桥

       <mac address='52:54:00:6a:1e:54'/>

       <source bridge='br0'/>

       <model type='virtio'/>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

     </interface>

     <serial type='pty'>　　　　　　##串口信息可以不用更改

       <target port=''/>

     </serial>

     <console type='pty'>

       <target type='serial' port=''/>

     </console>

     <channel type='unix'>

       <target type='virtio' name='org.qemu.guest_agent.0'/>

       <address type='virtio-serial' controller='' bus='' port=''/>

     </channel>

     <channel type='spicevmc'>

       <target type='virtio' name='com.redhat.spice.0'/>

       <address type='virtio-serial' controller='' bus='' port=''/>

     </channel>

     <input type='tablet' bus='usb'/>

     <input type='mouse' bus='ps2'/>

     <input type='keyboard' bus='ps2'/>

     <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>

     <sound model='ich6'>　　　　　　##从此往下的内容可以不用更改

       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

     </sound>

     <video>

       <model type='qxl' ram='' vram='' vgamem='' heads=''/>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>

     </video>

     <redirdev bus='usb' type='spicevmc'>

     </redirdev>

     <redirdev bus='usb' type='spicevmc'>

     </redirdev>

     <memballoon model='virtio'>

       <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>

     </memballoon>

   </devices>

 </domain>