kvm的xml文件解释

<domain type='kvm'>
        <name>test_ubuntu</name> //虚拟机名称
        <memory>1048576</memory> //最大内存，单位k
        <currentMemory>1048576</currentMemory> //可用内存，单位k
        <vcpu>8</vcpu> //虚拟cpu个数
        <os>
          <type arch='x86_64' machine='pc'>hvm</type>
          <boot dev='cdrom'/> //光盘启动
       </os>
       <features>
         <acpi/>
         <apic/>
         <pae/>
       </features>
       <clock offset='localtime'/>
       <on_poweroff>destroy</on_poweroff>
       <on_reboot>restart</on_reboot>
       <on_crash>destroy</on_crash>
       <devices>
         <emulator>/usr/libexec/qemu-kvm</emulator>
         <disk type='file' device='disk'>
          <driver name='qemu' type='qcow2'/>
           <source file='/var/lib/libvirt/images/test.qcow2'/> //目的镜像路径
           <target dev='hda' bus='ide'/>
         </disk>
         <disk type='file' device='cdrom'>
           <source file='/var/lib/libvirt/images/ubuntu.iso'/> //光盘镜像路径
           <target dev='hdb' bus='ide'/>
         </disk>
        <interface type='bridge'> //虚拟机网络连接方式
          <source bridge='kvmbr0'/> //当前主机网桥的名称
          <mac address="00:16:3e:5d:aa:a8"/> //为虚拟机分配mac地址，务必唯一，否则dhcp获得同样ip,引起冲突
        </interface>
        <input type='mouse' bus='ps2'/>
         <graphics type='vnc' port='-1' autoport='yes' listen = '0.0.0.0' keymap='en-us'/>//vnc方式登录，端口号自动分配，自动加1，可以通过virsh vncdisplay来查询
       </devices>
     </domain>