How do I shrink a KVM disk image?

How do I shrink a KVM disk image?

There’s 3 things you need to do:

1. Make the disk image bigger. In your host:
2. Make the partition inside the disk image bigger.
3. Finally, if you resized your existing partition, make the filesystem inside the new bigger partition bigger (this is actually in the guide linked above anyway).

How do I shrink a raw image?

Shrink the image (. img) file

1. Locate your . img file.
2. Make a copy of your VM’s . img file.
3. Shrink the image to the size you want it to be. Remember, this has to be bigger than the total size of the Windows partitions on the disk.
4. Restart your VM and make sure it launches correctly.

How can I reduce my QCOW2 size?

How to reduce the size of KVM QCOW2 images that grow out of hand

1. Free up any space in the disk from within the VM.
2. Shutdown the VM.
3. Backup the disk image that you want to reduce(Optional, if have a lot of faith in Unix commands that you never heard about before )
4. from the directory where your image is stored call:

What does Virt Sparsify do?

Virt-sparsify is a tool which can make a virtual machine disk (or any disk image) sparse a.k.a. thin-provisioned. This means that free space within the disk image can be converted back to free space on the host. Virt-sparsify can locate and sparsify free space in most filesystems (eg.

How do I resize a disk image in Linux?

Execute sudo gparted /dev/loop0. Shrink the loop partition(s) as deemed appropriate; please make sure to have these partitions unmounted. Execute fdisk /dev/loop0 , then enter p , this will show you the block size and end block number of the various partitions. Execute sudo dd if=/dev/loop0 of=shrunk_image_file.

What is Virsh in Linux?

virsh list is a basic command that lists all running domains (VMs). You can also list all configured VMs by adding the –all option. This is useful if you want to see all VMs configured in the target hypervisor that you can use on subsequent commands.

What is QEMU IMG?

Description. qemu-img allows you to create, convert and modify images offline. It can handle all image formats supported by QEMU. Warning: Never use qemu-img to modify images in use by a running virtual machine or any other process; this may destroy the image.

Is qcow2 a sparse?

Normally the qcow2 format always allocates space dynamically (sparse), but some qemu versions fail at this, they create disks with full expected size.

Is qcow2 compressed?

Only the qcow2 format supports encryption or compression. qcow2 encryption uses the AES format with secure 128-bit keys. qcow2 compression is read-only, so if a compressed sector is converted from qcow2 format, it is written to the new format as uncompressed data.

Is QCOW2 a sparse?

How do I compress a disk image?

To create a compressed disk image with “dd” :

1. Boot into rescue mode with the installation media.
2. Create a mount point for your external drive: # mkdir /mnt/external.
3. Mount your external drive: # mount /dev/sdb1 /mnt/external.
4. Create the compressed disk image: # dd if=/dev/sda | gzip -9 > /mnt/external/filename.img.gz.