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@ -2,7 +2,7 @@
title: Resize an existing virtual disk
description:
published: true
date: 2024-07-13T13:11:07.613Z
date: 2024-07-13T13:33:59.560Z
tags:
editor: markdown
dateCreated: 2021-11-13T11:41:29.087Z
@ -19,7 +19,7 @@ A virtual machine's disk may have to be resized, typically due to lack of space.
> In-place expansion is not supported. A new disk of the desired size has to be created.
{.is-info}
* Navigate to the location that contains the existing image.
* Navigate to the location that contains the existing image
```
cd /var/lib/libvirt/images
@ -33,24 +33,31 @@ Use the following command to create a disk of 20 GB called `guest_20G.img`.
qemu-img create -f raw guest_20G.img 20G
```
* Identify the filesystem layout of the existing disk
* Expand the root partition
> *This command expects the root partition to be located on the vda3 partition. It has only been tested against the `ext4`filesystem.*
{.is-warning}
* Identify the filesystem layout of the existing disk `guest.img`
```
virt-resize --expand /dev/vda3 phyllome.img phyllome-bigger.img
# virt-filesystems -a -l -h guest.img
Name Type VFS Label Size Parent
/dev/vda1 filesystem vfat EFI 133935104 -
/dev/vda2 filesystem ext4 boot 366869504 -
/dev/vda3 filesystem ext4 root 9933475840 -
```
One can tell that the root partition is located under `/dev/vda3`. This is the one that will need to be expanded.
* Copy the formet old data to the new disk and expand the root partition of the said disk
> This command is cabable of expanding different kinds of filesystems, including `ext4` and `btrfs`
{.is-info}
```
# virt-resize --expand /dev/vda3 guest.img guest_20G.img
```
* The following should appear
* Review the changes
```
[ 0.0] Examining phyllome.img
[ 0.0] Examining guest_20G.img
**********
Summary of changes:
@ -59,12 +66,12 @@ Summary of changes:
/dev/vda2: This partition will be left alone.
/dev/vda3: This partition will be resized from 5G to 15G. The
/dev/vda3: This partition will be resized from 10G to 20G. The
filesystem ext4 on /dev/vda3 will be expanded using the ‘resize2fs’
method.
**********
[ 2.1] Setting up initial partition table on phyllome-bigger.img
[ 2.1] Setting up initial partition table on guest_20G.img
[ 12.9] Copying /dev/vda1
[ 13.1] Copying /dev/vda2
[ 13.4] Copying /dev/vda3
@ -75,15 +82,47 @@ Resize operation completed with no errors. Before deleting the old disk,
carefully check that the resized disk boots and works correctly.
```
* *Switch to the new disk for your virtual machine*
* Switch to the new disk for your virtual machine
*To-do*
Now that the new disk has been created, it can be used in the virtual machine.
```
# virsh edit guest
```
Locate the source line for the existing disk `guest.img`:
```
[...]
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback' discard='unmap'/>
<source file='/var/lib/libvirt/images/guest.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
</disk>
[...]
```
Edit the said line so that it points to the new disk `guest-20G.img`:
```
[...]
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback' discard='unmap'/>
<source file='/var/lib/libvirt/images/guest-20G.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
</disk>
[...]
```
Start the virtual machine and ensure that it is working properly. If it does, the former disk could be removed.
## Resources
As per the software description : "*qemu-img allows you to create, convert and modify images offline. It can handle all image formats supported by QEMU.*"
* *Installation*
* Installation
On Fedora-related distributions, `virt-resize` is provided by the `guestfs-tools` package :