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80 lines
2.3 KiB
Markdown
80 lines
2.3 KiB
Markdown
---
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title: Resize a guest disk image
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description: Resize a a guest disk image using qemu-img and virt-resize
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published: true
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date: 2021-11-01T23:40:55.146Z
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tags:
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editor: markdown
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dateCreated: 2021-08-12T10:55:58.877Z
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---
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# qemu-img and virt-resize
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## Introduction
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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.*"
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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.
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> In-place expansion is not supported, which mean than a copy of the disk to be expanded has to be created
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{.is-info}
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## Installation
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* On Fedora-related distributions, `virt-resize` is provided by the `guestfs-tools` package :
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```
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# dnf install guestfs-tools
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```
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## Usage
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* **Create a new disk image**
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In-place expansion is not supported. A new disk of the desired size has to be created.
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Use the following command to create `phyllome_but_bigger.img`, a disk of 15 GiB
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```
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$ qemu-img create -f raw phyllome-bigger.img 15G
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```
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* **Expand the root partition**
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> This command only works if the root partition is located on vda3 and if the disk image filesystem uses EXT4.
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{.is-warning}
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This command bellow requires root privileges.
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```
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# virt-resize --expand /dev/vda3 phyllome.img phyllome_but_bigger.img
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[ 0.0] Examining phyllome.img
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**********
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Summary of changes:
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/dev/vda1: This partition will be left alone.
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/dev/vda2: This partition will be left alone.
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/dev/vda3: This partition will be resized from 5G to 15G. The
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filesystem ext4 on /dev/vda3 will be expanded using the ‘resize2fs’
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method.
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**********
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[ 2.1] Setting up initial partition table on phyllome-bigger.img
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[ 12.9] Copying /dev/vda1
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[ 13.1] Copying /dev/vda2
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[ 13.4] Copying /dev/vda3
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100% ⟦▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒⟧ 00:00
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[ 38.3] Expanding /dev/vda3 using the ‘resize2fs’ method
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Resize operation completed with no errors. Before deleting the old disk,
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carefully check that the resized disk boots and works correctly.
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```
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* **Inform your virtual machine to use the new disk**
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*To-do*
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