应用virsh和xml文件创立虚拟机

（1）硬盘镜像文件:
格局：raw或qcow2

# qemu-img create -f raw fdisk.img 10G
# qemu-img info fdisk.img
（2）编写xml设置装备摆设文件，这一步在后面做具体先容
（3）创立并运转虚构机

# virsh define vm0.xml  //导入虚构机设置装备摆设
# virsh start vm0  //开启vm0
# virsh list --all  // 表现一切虚构机状况
# virsh destroy vm0  //烧毁虚构机
# virsh undefine vm1  //删除虚构机设置装备摆设
# virsh dumpxml vm0 //表现虚构机xml设置装备摆设
此中“vm0.xml”是步调（2）中创立的xml文件。

虚构机XML文件

<domain type="kvm">  //如果是Xen，则type=‘xen’
  <name>vm0</name> //虚构机称号，统一物理机独一
  <uuid>fd3535db-2558-43e9-b067-314f48211343</uuid>  //统一物理机独一，可用uuidgen天生
  <memory>524288</memory>
  <currentmemory>524288</currentmemory>  //memory这两个值最佳设成同样
  <vcpu>2</vcpu>            //虚构机能够使用的cpu个数，检查物理机可用CPU个数：cat /proc/cpuinfo |grep processor | wc -l 
  <os>
   <type arch="x86_64" machine="pc-i440fx-vivid">hvm</type> //arch指出体系架构范例，machine 则是机械范例，检查机械范例：qemu-system-x86_64 -M ?
   <boot dev="hd">  //启动介质，第一次必要装体系能够抉择cdrom光盘启动
   <bootmenu enable="yes">  //表现启动按F12进入启动菜单
  </bootmenu></boot></os>
  <features>
   <acpi>  //Advanced Configuration and Power Interface,高档设置装备摆设与电源接口
   <apic>  //Advanced Programmable Interrupt Controller,高档可编程中止控制器
   <pae>   //Physical Address Extension,物理地点扩大
  </pae></apic></acpi></features>
  <clock offset="localtime">  //虚构机时钟设置，这里表现当地本机光阴
  <on_poweroff>destroy</on_poweroff>  //突发事件举措
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>   //装备设置装备摆设
   <emulator>/usr/bin/kvm</emulator> //如果是Xen则是/usr/lib/xen/binqemu-dm
   <disk device="disk" type="file"> //硬盘
      <driver name="qemu" type="raw">
      <source file="/opt/vm/vmdev/fdisk.img">
      <target bus="virtio" dev="vda"><address bus="0x00" domain="0x0000" function="0x0" slot="0x06" type="pci"> //域、总线、槽、功效号，slot值统一虚构机上独一
   
   <disk device="disk" type="file">  
      <driver name="qemu" type="raw"> 
      <source file="/opt/vm/vmdev/fdisk2.img">
      <target bus="virtio" dev="vdb">  
   </target></source></driver></disk>
   <disk device="cdrom" type="file"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img">//光盘
      <driver name="qemu" type="raw">
      <source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso">
      <target bus="ide" dev="hdc">
      <readonly>
   </readonly></target></source></driver></source></source></source></source></source></source></disk>
   <interface type="bridge"><source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmdev/fdisk2.img"><source file="/opt/vm/vmiso/ubuntu-15.10-server-amd64.iso"><source file="/opt/vm/vmdev/fdisk2.img">  //应用Linux网桥衔接收集 

 <mac address="fa:92:01:33:d4:fa"> 

      <source bridge="br100">  //设置装备摆设的网桥网卡称号

      <target dev="vnet0">     //统一网桥下雷同

      <alias name="net0">      //别号，统一网桥下雷同<address bus="0x00" domain="0x0000" function="0x0" slot="0x03" type="pci">  //留意slot值独一

   

/* 应用ovs网桥衔接收集 

   <interface type="bridge">  

      <source bridge="br-ovs0">  

      <virtualport type="openvswitch">

      <target dev="tap0">     

      <model type="virtio">  

   </model></target></virtualport></source></interface>

*/

/* 设置装备摆设成pci纵贯虚构机衔接收集，SR-IOV网卡的VF场景

<hostdev managed="yes" mode="subsystem" type="pci"><source bridge="br-ovs0"><source bridge="br-ovs0"><source bridge="br-ovs0"><source bridge="br-ovs0"><source bridge="br-ovs0"><source bridge="br-ovs0">

  <source><address bus="0x03" domain="0x0000" function="0x0" slot="0x00">

 

*/
interface type='network'>   //基于虚构局域网的收集
      <mac address="52:54:4a:e1:1c:84">  //可用敕令天生，见下面的弥补
      <source network="default"> //默许
      <target dev="vnet1">  //统一虚构局域网的值雷同
      <alias name="net1"><address bus="0x00" domain="0x0000" function="0x0" slot="0x04" type="pci">  //留意slot值
   
   <graphics autoport="yes" keymap="en-us" listen="0.0.0.0" port="5900" type="vnc" virsh="" vm0="" vncdisplay="">
   <listen address="0.0.0.0" type="address">
  </listen></graphics></address></alias></target></source></mac></address></source></source