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---
title: Resize a guest disk image
description: Resize a a guest disk image using qemu-img and virt-resize
published: true
2021-08-12 10:56:37 +00:00
date: 2021-08-12T10:56:34.771Z
2021-08-12 10:56:03 +00:00
tags:
editor: markdown
dateCreated: 2021-08-12T10:55:58.877Z
---
2021-08-12 10:56:37 +00:00
# qemu-img and virt-resize
2021-08-12 10:56:03 +00:00
## Introduction
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.*"
Expanding a new disk implies creating a new blank image of the desired size and "copy" the existing disk into this new bigger image using virt-resize.
## Usage
* Create the new disk phyllome_but_bigger.img of the desired size. In this case, it is 15 GiB
```
$ qemu-img create -f raw /var/lib/libvirt/images/phyllome_but_bigger.img 15G
```
* Expand the root partition on the disk.
> This command only works if the root partition is located on vda3 and if the disk image filesystem uses EXT4.
{.is-warning}
```
# virt-resize --expand /dev/vda3 phyllome.img phyllome_but_bigger.img
```
```
[ 0.0] Examining phyllome.img
**********
Summary of changes:
/dev/sda1: This partition will be left alone.
/dev/sda2: This partition will be left alone.
/dev/sda3: This partition will be resized from 24.5G to 499.5G. The
filesystem ext4 on /dev/sda3 will be expanded using the resize2fs
method.
**********
[ 2.1] Setting up initial partition table on nested-hypervisor-secure-boot.img
[ 12.9] Copying /dev/sda1
[ 13.1] Copying /dev/sda2
[ 13.4] Copying /dev/sda3
100% ⟦▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒⟧ 00:00
[ 38.3] Expanding /dev/sda3 using the resize2fs method
Resize operation completed with no errors. Before deleting the old disk,
carefully check that the resized disk boots and works correctly.
```