KVM Notes

KVM Install Notes

# https://help.ubuntu.com/community/KVM/Installation

sudo apt-get install qemu-kvm libvirt-bin bridge-utils

sudo usermod -a -G libvirtd $USER

sudo systemctl start libvirtd 
sudo systemctl enable libvirtd 

# autostart on boot
virsh autostart <domain-id>

# change cdrom
virsh change-media db12-dev hdc /pool/iso/VISUALERP800_Install_win.iso

KVM ACPI Shutdown

1. Ensure the ACPI is enabled in your virtual machine settings.
2. Login to your Windows guest and launch Group Policy Object Editor (gpedit.msc).
3. Locate the following key and change the settings to enabled.
  Computer Configuration\Windows Settings\
  Security Settings\Local Policies\Security Options\
  Shutdown: Allow system to be shut down without having to log on
4. If you want to be able shutdown guest even there is a logged in user add the following to file ShutdownWarningDialogTimeout.reg and enter it into windows registry.
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows]
"ShutdownWarningDialogTimeout"=dword:00000001

KVM Add disk to Guest

qemu-img create -f qcow2 /pool/vms/db-data.qcow2 200G
qemu-img create -f qcow2 /pool/vms/db-log.qcow2 200G
qemu-img create -f qcow2 /pool/vms/db-backup.qcow2 200G

virsh attach-disk db12-dev --source /pool/vms/db-data.qcow2 --target vdd --type qcow2 --persistent
virsh attach-disk db12-dev --source /pool/vms/db-log.qcow2 --target vde --type qcow2 --persistent
virsh attach-disk db12-dev --source /pool/vms/db-backup.qcow2 --target vdf --type qcow2 --persistent

KVM Clone Windows

# on windows guest: run sysprep
C:\Windows\System32\Sysprep\sysprep.exe /generalize /shutdown /oobe

# on host: clone the image
virt-clone --original win12 --name db12-dev --file /pool/vms/db12-dev.qcow2

# set max memory to new value if needed
virsh setmaxmem db12-dev 16G --config

virsh dumpxml db12-dev > /pool/vms/db12-dev.xml

# hardware addresses need to be removed, libvirt will assign new addresses automatically
sed -i /uuid/d /pool/vms/db12-dev.xml
sed -i '/mac address/d' /pool/vms/db12-dev.xml

virsh define /pool/vms/db12-dev.xml
virsh start this-vm

vncport.py

from xml.etree import ElementTree as ET

import sys
import libvirt

conn = libvirt.open()

domain = conn.lookupByName(sys.argv[1])

#get the XML description of the VM
vmXml = domain.XMLDesc(0)
root = ET.fromstring(vmXml)

#get the VNC port
graphics = root.find('./devices/graphics')
port = graphics.get('port')

print port