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@ -2,7 +2,7 @@
title: Resize an existing virtual disk title: Resize an existing virtual disk
description: description:
published: true published: true
date: 2024-07-13T13:11:07.613Z date: 2024-07-13T13:33:59.560Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2021-11-13T11:41:29.087Z 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. > In-place expansion is not supported. A new disk of the desired size has to be created.
{.is-info} {.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 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 qemu-img create -f raw guest_20G.img 20G
``` ```
* Identify the filesystem layout of the existing disk * Identify the filesystem layout of the existing disk `guest.img`
* 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}
``` ```
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: Summary of changes:
@ -59,12 +66,12 @@ Summary of changes:
/dev/vda2: This partition will be left alone. /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’ filesystem ext4 on /dev/vda3 will be expanded using the ‘resize2fs’
method. 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 [ 12.9] Copying /dev/vda1
[ 13.1] Copying /dev/vda2 [ 13.1] Copying /dev/vda2
[ 13.4] Copying /dev/vda3 [ 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. 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 ## 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.*" 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 : On Fedora-related distributions, `virt-resize` is provided by the `guestfs-tools` package :