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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
+date: 2021-08-12T10:55:58.877Z
+tags: 
+editor: markdown
+dateCreated: 2021-08-12T10:55:58.877Z
+---
+
+# qemu-img
+
+## 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.
+```
+