<domain type="kvm">

    <name>centos</name>  <!--虚拟机名称-->

    <memory unit="MiB">1024</memory>   <!--最大内存，单位k-->

    <currentMemory unit="MiB">1024</currentMemory>  <!--可用内存，单位k-->

    <vcpu>2</vcpu>   <!--//虚拟cpu个数-->

    <os>

        <type arch="x86_64" machine="pc">hvm</type>

        <boot dev="hd" /> <!-- 硬盘启动 -->

        <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="br0" />      <!--当前主机网桥的名称-->

        </interface>

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

        <!--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-->

        <graphics type="vnc" port="-1" autoport="yes" listen="0.0.0.0" keymap="en-us" />

    </devices>

</domain>