How to get the virtual machine's runtime xml configuration in KVM ?

Issue

Issue

I attached a flash disk by command virsh attach-disk rhel5 /dev/sdc sdb , how to save this configuation ?

Environment

• Red Hat Enterprise Linux 5
• KVM

Resolution

Execute command

# virsh dumpxml <YourVirtualMachineName>

and redirect the output to /etc/libvirt/qemu/ with a filename end of .xml ,then edit the xml file and

1 delete the "id" attribute of element "domain" .

2 delete the "target" element under "interface" element .

3 replace value of "port" attribute to -1 of "graphics" element .

after that backup your old configuation and replace it with new configuation .

For example:

# virsh dumpxml rhel5
<domain type='kvm' id='24'> ← Here
  <name>rhel5u4</name>
  <uuid>635b059b-e352-8eab-f246-1773410b8599</uuid>
  <memory>524288</memory>
  <currentMemory>524288</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='block' device='disk'>
      <source dev='/dev/vgdata/rhel5'/>
      <target dev='hda' bus='ide'/>
    </disk>
    <interface type='network'>
      <mac address='54:52:00:23:d7:36'/>
      <source network='default'/>
      <target dev='vnet3'/> ← Here
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/7'/>
      <target port='0'/>
    </serial>
    <console type='pty' tty='/dev/pts/7'>
      <source path='/dev/pts/7'/>
      <target port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5902' autoport='yes' keymap='en-us'/> ← Here
  </devices>
</domain>