libvirt 启动虚拟机xml配置文件

 <domain type='kvm'>
  <name>centos_x86_6.4</name>
  #由字母和数字组成，不能包含空格 
  <uuid>b9dcdd92-9b9b-14d6-3938-1982a9746a12</uuid>
  <memory unit='KiB'>2097152</memory>
　#由字母和数字组成，不能包含空格 
  <currentMemory unit='KiB'>2097152</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-1.2'>hvm</type>
    #type 表示全虚拟化还是半虚拟化，hvm表示全虚拟化 
    <boot dev='hd'/>
　　#boot 怎么启动的，如"fd"表示从文件启动, "hd"从硬盘启动, "cdrom"从光驱启动 和 "network"从网络启动 #可以重复多行，指定不同的值，作为一个启动设备列表。 #The dev attribute takes one of the values "fd", "hd", "cdrom" or "network" 
  </os>
  #处理器特性 
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>　
  <clock offset='localtime'>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='rtc' tickpolicy='catchup'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
#Guest需要的设备
   <emulator>/bin/qemu-kvm</emulator>

    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      #目的镜像路径 在这个例子中，在guest中显示为IDE设备。 
      <source file='/home/template_make/centos_x86_6.4.img'>
        <seclabel model='selinux' relabel='no'/>
      </source>
      <target dev='hda' bus='ide'/>
      <alias name='ide0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/home/template_make/CentOS-6.4-x86_64-bin-DVD1.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <alias name='ide0-1-0'/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0'>
      <alias name='usb0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <interface type='bridge'>
    #虚拟机网络连接方式 
      <mac address='52:54:00:78:f9:5a'/>
      <source bridge='br0'/>
      <target dev='vnet27'/>
      ## 使用virtio： 采用普通的驱动，即硬盘和网卡都采用默认配置情况下，硬盘是 ide 模式， 而网卡工作在 模拟的rtl 8139 网卡下，速度为100M 全双工。 采用 virtio 驱动后，网卡工作在 1000M 的模式下，硬盘工作是SCSI模式下
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <input type='mouse' bus='ps2'/>
    #vnc方式登录，端口号自动分配 可以通过virsh vncdisplay来查询[vncdisplay domainId] 
    <graphics type='vnc' port='5915' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='selinux' relabel='yes'>
    <label>unconfined_u:system_r:svirt_t:s0:c362,c396</label>
    <imagelabel>unconfined_u:object_r:svirt_image_t:s0:c362,c396</imagelabel>
  </seclabel>
</domain>