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title: Resize a guest disk image title: Resize a guest disk image
description: Resize a a guest disk image using qemu-img and virt-resize description: Resize a a guest disk image using qemu-img and virt-resize
published: true published: true
date: 2021-08-12T12:17:26.497Z date: 2021-09-10T09:34:56.872Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2021-08-12T10:55:58.877Z dateCreated: 2021-08-12T10:55:58.877Z
@ -16,19 +16,29 @@ As per the software description : "*qemu-img allows you to create, convert and m
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. 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.
> In-place expansion is not supported.
{.is-info}
## Usage ## Usage
* Create the new disk phyllome_but_bigger.img of the desired size. In this case, it is 15 GiB * **Create a new disk image**
In-place expansion is not supported. A new disk of the desired size has to be created.
Use the following command to create `phyllome_but_bigger.img`, a disk of 15 GiB
``` ```
$ qemu-img create -f raw /var/lib/libvirt/images/phyllome-bigger.img 15G $ qemu-img create -f raw phyllome-bigger.img 15G
``` ```
* Expand the root partition on the disk. * **Expand the root partition**
> This command only works if the root partition is located on vda3 and if the disk image filesystem uses EXT4. > This command only works if the root partition is located on vda3 and if the disk image filesystem uses EXT4.
{.is-warning} {.is-warning}
This command bellow requires root privileges.
``` ```
# virt-resize --expand /dev/vda3 phyllome.img phyllome_but_bigger.img # virt-resize --expand /dev/vda3 phyllome.img phyllome_but_bigger.img
@ -57,3 +67,6 @@ 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.
``` ```
* **Inform your virtual machine to use the new disk**
*To-do*