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---
layout: post
title: "Converting OVA images to KVM"
description: "Converting an Open Virtual Appliance OVA-File to use in KVM"
category: Installation
tags: [Linux, Ubuntu, Debian, OVA, Virtual Appliance]
---
{% include JB/setup %}
The Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances for the use in virtual machines.
An OVA file is a one file alternative to pack a multi file OVF directory.
This is a short example how to convert OVA for the use in a proxmox 2.0 KVM environment. The OVA file was exported from the Virtualbox software, where we had build a debian based virtual machine.
## Extract the OVA Archive
OVA files are TAR archives with the OVF directory inside. <br />
To extract the archive do
tar -xvf Virtual_Appliance_Debian.ova
=>
Virtual_Appliance_Debian.ovf
Virtual_Appliance_Debian-disk.vmdk
You get Virtual_Appliance_Debian-disk.vmdk which is a virtual machine disk file. The VMDK file format was developed for the use in VMWare or Virtualbox. It is an open format.
## Converting VMDK to RAW and from RAW to qcow2
With the free available software Virtualbox it is possible to convert VMDK disk files to RAW image format.
VBoxManage clonehd --format RAW Virtual_Appliance_Debian-disk.vmdk Virtual_Appliance_Debian-disk.raw
=> Virtual_Appliance_Debian-disk.raw
Convert the RAW image file to qemu format:
qemu-img convert -f raw Virtual_Appliance_Debian-disk.raw -O qcow2 Virtual_Appliance_Debian-disk.qcow2
=> Virtual_Appliance_Debian-disk.qcow2
<br />
## Use qcow2 files in Proxmox 2.0
The use of an existing qcow2 file in proxmox 2.0 is very easy. Just create a new virtual machine and replace the disk file with the qcow2 file.
* create a new KVM virtual machine via the proxmox webinterface.
* Click __Create VM__.
* __General__: select Node, VM ID and Name.
* __OS__: Select the operating system type of your virtual machine.
* __CD/DVD__: Do not use any media.
* __Hard Disk__: Select existing lvm storage for __storage__ and choose same or better bigger disk size as the original VM disk size.
* __other Tabs__: as needed for the new virtual machine.
* __Confirm__: Click __Finish__
Proxmox has created a new disk file for the virtual machine. Do not start the new VM. Replace the proxmox generated qcow2 file with our Virtual_Appliance_Debian-disk.qcow2
mv Virtual_Appliance_Debian-disk.qcow2 /var/lib/vz/images/105/vm-105-disk-1.qcow2
Start the virtual machine via the proxmox webinterface.
## Insertion: About Unzipping 7zip files
Sometimes we use 7zip compressed files for easier transportation of disk images. <br />
Install 7zip if not already installed:
sudo apt-get install p7zip
Unzip the 7zip file:
7z x Virtual_Appliance_Debian.ova.7z
<br />
## see also
external information sources:
* Convert Virtualbox vdi to KVM qcow: [http://blog.bodhizazen.net/linux/convert-virtualbox-vdi-to-kvm-qcow/](http://blog.bodhizazen.net/linux/convert-virtualbox-vdi-to-kvm-qcow/)
* Migration of servers to Proxmox VE: [http://pve.proxmox.com/wiki/Migration_of_servers_to_Proxmox_VE#VMware_to_Proxmox_VE_.28KVM.29](http://pve.proxmox.com/wiki/Migration_of_servers_to_Proxmox_VE#VMware_to_Proxmox_VE_.28KVM.29)
* qcow image format: [http://people.gnome.org/~markmc/qcow-image-format.html](http://people.gnome.org/~markmc/qcow-image-format.html)
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