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Questions tagged [qcow2]

QCOW2 stands for QEMU Copy -On- Write file. The QCOW image format is one of the disk image formats supported by the QEMU processor emulator.

QCOW2 stands for QEMU Copy -On- Write file. The QCOW image format is one of the disk image formats supported by the QEMU processor emulator. It is a representation of a fixed size block device in a file.

Source:The QCOW2 Image Format

20 questions
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Ambiguity using "ls -l" and "file" commands on a qcow file

I have a qcow2 file on my filesystem and I am trying to find the size of that file. For this, when I do a ls -l in the location where the file is stored, I get 13041664, which means the file size is around 13 MB and when I do a file , I…
jobin
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Ubuntu Cloud Images - Desktop versions

I was wondering why on official Ubuntu cloud image repository there are only server versions and not standard desktop images (with GUI). Which is the simplest way to create it? Thanks!
user565330
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What's the difference between ubuntu's amd64-disk-kvm.img and the regular amd64.img cloud images?

On https://cloud-images.ubuntu.com/groovy/current/ there is (among many others) both a groovy-server-cloudimg-amd64-disk-kvm.img and a groovy-server-cloudimg-amd64.img. What's the difference?
Frederik Baetens
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How do I restore a Virtualbox VM from backup? (qcow)

I have backed up the contents of the directory "VirtualBox VMs" and now I am trying to restore the states of my virtual machines by copying the backed up files, back. Now when I select "Machine" -> "Add" and select the qcow file of my VM, I receive…
Nickolai Leschov
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qcow2 image much bigger then original vmdk file after conversion. how to avoid that?

I converted a vmdk image file to qcow2 with qemu-img (on a ubuntu 14.04 server) sudo qemu-img convert -f vmdk -O qcow2 Odoo-disk1.vmdk odoo-disk1.qcow2 now, the resulting qcow2 image is more then twice as big as the original. $ ls -lh -rwxrwxrwx 1…
vrms
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QEMU: qcow2 and RAW.....which filesystem combi (avoid writing journal twice)?

Let's say my host disk is using EXT4, I place an image-file for my virtual machine in either QCOW2 or RAW format which again is formatted with EXT4 inside. Wouldn't journal data be written twice? First in the guest drive and then on the host? Can I…
MrCalvin
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Virtual Machine best practices, and RAW vs QCOW2

Tl/Dr: rebuilding VMs after OS SSD crash. Looking for best practice tips to see if I am missing anything, and to confirm if RAW vs QCOW2 has performance differences, and if they can be set up with the same command, or need different commands to set…
Ziggidy
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File size increases on disk image conversion with qemu-img

I downloaded two Ubuntu cloud image files xenial-server-cloudimg-amd64-disk1.img (294M) and xenial-server-cloudimg-amd64-disk1.vmdk (282M) from https://cloud-images.ubuntu.com/xenial/current/. I modified the .img to make it work on VirtualBox and…
Srij
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Extracting qcow2 image to a smaller real drive

How can i extract a qcow2 image (512gb, mostly free space) to a 128gb SSD? it will then be used as the boot drive
Jackson Doak
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How to export qcow2 KVM image?

I have set up a new QEMU virtual machine through KVM on a Ubuntu 14.10 linux installation. Everything is working smoothly. The problem is when I try to export the qcow2 vm image to another PC, to migrate the vm. The qcow2 image is 4GB though the…
int 2Eh
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Error while modifing an image using guestfish

I tried to modify my .qcow2 image using guestfish guestfish --rw -a parsecROI.img.qcow2 Welcome to guestfish, the libguestfs filesystem interactive shell for editing virtual machine filesystems. Type: 'help' for help on commands 'man' to…
Ahmed Shafik
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Migrate from GCP VM to Hetzner VPS

I have a running GCP VM that I need to migrate to Hetzner Cloud, both Ubuntu 22.04. I have three options here: Take an image and exported as QCOW2 from GCP, then some how converted to ISO and uploaded it to Hetzner so their support can download it…
Ali Yakoot
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Export a Multipass-VM to a .QCOW2 file

I was working with Multipass to create a VM machine of Ubuntu Bionic. I have made a lot of changes to the initial installation (one includes kernel changes) and that's why I would like to export in a QCOW2 image, because I need to recreate this…
Jairo Mejia
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Move data from qcow2 image to another guest

I have a corrupted guest and I cannot reboot the guest. So I have mounted my guest to my host and this is what I have in /mnt $ sudo ls /mnt bin boot dev etc home initrd.img initrd.img.old lib lib64 lost+found media mnt opt proc root …
Autolycus
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virsh shows VM running, but it either doesn't start, or has no network access

I am having a HECK of a time getting virtual machines running on 18.04 (server) LTS. I say running, because it FEELS like virsh REPORTS it running, but that it never starts up. This is a very basic test VM I am trying to set up so that I can get the…
Ziggidy
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