1 安装虚拟化相关组件

yum -y install qemu-img qemu-kvm  libvirt

2 启动libvirt服务

systemctl  start libvirtd

3 配置xml，创建空镜像

qemu-img create -f qcow2  test.qcow2  20G

<domain type='kvm'> 
    <name>test_jkk</name> 
    <memory>1048576</memory> 
    <currentMemory>1048576</currentMemory>
    <vcpu>1</vcpu>
    <os> 
      <type arch='x86_64' machine='pc'>hvm</type> 
      <boot dev='cdrom'/>
   </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='/home/kvm/test.qcow2'/>
       <target dev='hda' bus='ide'/> 
     </disk> 
     <disk type='file' device='cdrom'> 
       <source file='/home/kvm/centos_minimal.iso'/>
       <target dev='hdb' bus='ide'/> 
     </disk> 
    <interface type='bridge'>
      <source bridge='virbr0'/> 
    </interface> 
    <input type='mouse' bus='ps2'/> 
     <graphics type='vnc' port='-1' autoport='yes' listen = '0.0.0.0' keymap='en-us'/>
   </devices> 
</domain> 

4  定义启动虚拟机

virsh define test.xml
virsh start  test_jkk
virsh  vncdisplay   test_jkk  查看虚拟机vnc串口