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This article analyzes "how Linux uses virtual machines on KVM". The content is detailed and easy to understand. Friends who are interested in "how to use a virtual machine on Linux on KVM" can follow the editor's train of thought to read it deeply. I hope it will be helpful to you after reading. Let's follow the editor to learn more about "how Linux uses virtual machines on KVM".

Are you considering switching from VirtualBox to KVM hypervisor? One of your biggest concerns is to create a new virtual machine in KVM so you can start all over again, which can be said to be a daunting task.

The good news is that you can easily migrate VirtualBox VM in VDI format to qcow2 (that is, KVM's disk image format) without creating a new KVM guest computer.

In this article, we will outline the step-by-step process of how to migrate VirtualBox VM to KVM VM in Linux.

Step 1: list existing VirtualBox images

First, make sure that all virtual machines are turned off. The Virtualbox guest computer exists in VDI disk format. Next, list the existing VirtualBox virtual machines as shown in the figure.

$VBoxManage list hdds or $vboxmanage list hdds

From the output, you can see that I have two virtual disk images: the Debian VDI image and the Fedora VDI image.

Step 2: convert the VDI image to RAW disk format

The next step is to convert the VDI image to RAW disk format. To do this, run the following command.

$VBoxManage clonehd-format RAW / home/james/VirtualBox\ VMs/debian/debian.vdi debian_10_Server.img

Or

$vboxmanage clonehd-format RAW / home/james/VirtualBox\ VMs/debian/debian.vdi debian_10_Server.img

When you investigate, you will find that the RAW image format takes up a lot of disk space. You can use the du command shown in the figure to verify the size of the RAW image.

$du-h debian_10_Server.img

In my case, the Debian RAW image takes up 21 gigabytes of hard disk space, which is quite large. We will convert the RAW disk image to KVM disk format later.

Step 3: convert the RAW image disk format to KVM format

Finally, to migrate to the KVM disk image format, convert the RAW image to qcow2 format, which is the KVM disk image format.

$qemu-img convert-f raw debian_10_Server.img-O qcow2 debian_10_Server.qcow2qcow2

The qcow2 disk image is much smaller than the RAW disk image. Also use the du command to verify this, as follows:

$du-h debian_10_Server.qcow2

You can then import the qcow2 KVM image format on the command line or using the KVM graphical window and create a new KVM virtual machine.

So much for sharing about how Linux uses virtual machines on KVM. I hope the above content can improve everyone. If you want to learn more knowledge, please pay more attention to the editor's updates. Thank you for following the website!

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