Virtualization is the process of emulating IT systems such as servers, workstations, networks, and storage. It is nothing but the creation of a virtual rather than actual version of any operating system, a server, a storage device or network processes.

The main component which helps in emulation of virtual hardware is defined as a hyper-visor.

The following figure explains the two main types of system virtualization used.

Virtualization has been used in computational forensics in a number of ways. It helps the analyst in such a way that the workstation can be used in a validated state for each investigation. Data recovery is possible by attaching the dd image of a drive as a secondary drive on a virtual machine particularly. The same machine can be used as a recovery software to gather the evidences.

The following example helps in understanding the creation of a virtual machine with the help of Python programming language.

Step 1 − Let the virtual machine be named ”dummy1”.

Every virtual machine must have 512 MB of memory in minimum capacity, expressed in bytes.

vm_memory = 512 * 1024 * 1024

Step 2 − The virtual machine must be attached to the default cluster, which has been calculated.

vm_cluster = api.clusters.get(name = "Default")

Step 3 − The virtual machine must boot from the virtual hard disk drive.

vm_os = params.OperatingSystem(boot = [params.Boot(dev = "hd")])

All the options are combined into a virtual machine parameter object, before using the add method of the vms collection to the virtual machine.

Example

Following is the complete Python script for adding a virtual machine.

from ovirtsdk.api import API #importing API library
from ovirtsdk.xml import params

try: #Api credentials is required for virtual machine
   api = API(url = "https://HOST", 
      username = "Radhika", 
      password = "a@123", 
      ca_file = "ca.crt")
      
   vm_name = "dummy1"
   vm_memory = 512 * 1024 * 1024 #calculating the memory in bytes
   vm_cluster = api.clusters.get(name = "Default")
   vm_template = api.templates.get(name = "Blank")
   
   #assigning the parameters to operating system
   vm_os = params.OperatingSystem(boot = [params.Boot(dev = "hd")])
   
   vm_params = params.VM(name = vm_name,
      memory = vm_memory,
      cluster = vm_cluster,
      template = vm_template
      os = vm_os)

   try: 
      api.vms.add(vm = vm_params) 
      print "Virtual machine ''%s'' added." % vm_name #output if it is successful. 
   except Exception as ex: 
      print "Adding virtual machine ''%s'' failed: %s" % (vm_name, ex) 
      api.disconnect()
      
except Exception as ex: 
   print "Unexpected error: %s" % ex

Output

Our code will produce the following output −