kvm 安装虚拟机

使用virt-install:
（1） qemu-img create -f qcow2 ./centos.img 15G
（2） virt-install –name centos7 –ram 2048 –disk path=./images/centos7.qcow2,size=10 –vcpus 2 –os-type linux –os-variant rhel7 –network bridge=virbr0 –graphics none –console pty,target_type=serial –location ./boot/CentOS-7-x86_64-DVD-1511.iso –extra-args ‘console=ttyS0,115200n8 serial’

for windows7:
(1)qemu-img create -f qcow2 ./windows7.img 50G

(2)sudo virt-install –virt-type=kvm –name windows7 –ram 4096 –vcpus=4 –os-variant=win7 –virt-type=kvm –hvm –cdrom=/home/jack/vms/images/windows7.iso –network=bridge=virbr0,model=virtio –graphics vnc –disk path=/home/jack/vms/images/windows7.img,size=50,sparse=yes,bus=virtio,format=qcow2 –video cirrus

使用virsh:
(1) qemu-img create -f qcow2 ./centos.img 15G
(2) touch centos.xml

<domain type='kvm'>
  <name>centos7name>
  <uuid>4c8d5b14-eb51-2973-158f-fbc917a63f1auuid>
  <memory unit='KiB'>2097152memory>
  <currentMemory unit='KiB'>2097152currentMemory>
  <vcpu placement='static'>2vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-trusty'>hvmtype>
    <boot dev='hd'/>
  os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  features>
  <clock offset='utc'/>
  <on_poweroff>destroyon_poweroff>
  <on_reboot>restarton_reboot>
  <on_crash>restarton_crash>
  <devices>
    <emulator>/usr/bin/kvm-spiceemulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/centos7.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    disk>
    <controller type='usb' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    controller>
    <interface type='bridge'>
      <mac address='52:54:00:71:c2:4a'/>
      <source bridge='virbr0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    interface>
    <serial type='pty'>
      <target type='isa-serial' port='0'/>
    serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    console>
    <input type='tablet' bus='usb'/>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    memballoon>
  devices>
domain>

(3) virsh create centos7.xml