Resize Ubuntu VM Disk in Proxmox VE

This guide details the steps to successfully resize the disk space allocated to your Ubuntu VM within the Proxmox VE environment.

Prerequisites:

• Proxmox VE server with an Ubuntu VM
• Basic understanding of Linux commands (optional, but helpful)

Steps:

1. Increase Disk Size in Proxmox VE Web Interface:

   • Shut down your Ubuntu VM.
   • Navigate to the Proxmox VE web interface and select your VM.
   • Go to the "Hardware" tab.
   • Click on the virtual disk you want to resize.
   • Under "Disk Actions," choose "Resize."
   • Enter the desired new disk size and click "Resize" to confirm.

2. Extend Physical Drive Partition (if LVM is not used):

   Caution: These steps involve modifying partitions. Proceed with caution and ensure you have a backup of your VM data in case of any issues.

   • Log in to your Proxmox VE host via SSH.

   • Verify the current disk layout using:

     sudo fdisk -l

   • Identify the partition you want to extend (usually the third partition, /dev/sda3).

   • Use growpart to extend the partition size:

     sudo growpart /dev/sda 3

     Follow the on-screen prompts to specify the desired new size.

3. Extend Logical Volume (if LVM is used):

   • If your Ubuntu VM uses Logical Volume Management (LVM), follow these steps:

     • Check the current Logical Volume information:

       lvdisplay

     • View the physical drive information using pvdisplay:

       sudo pvdisplay

     • Identify the physical volume name associated with your extended partition (e.g., /dev/sda3).

     • Instruct LVM that the disk size has changed:

       sudo pvresize /dev/sda3

     • Verify the updated physical drive information:

       sudo pvdisplay

     • Extend the Logical Volume using its name (e.g., /dev/ubuntu-vg/ubuntu-lv):

       sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv

       The -l +100%FREE option utilizes all available free space within the Volume Group.

4. Resize Filesystem:

   • Resize the filesystem on the extended partition to utilize the additional space:

     resize2fs /dev/ubuntu-vg/ubuntu-lv

5. Verify Changes:

   • Confirm that the disk and filesystem have been resized successfully:

     fdisk -l

   • You can also boot your Ubuntu VM and use tools like df -h to check the available disk space.

Additional Notes:

• Consider backing up your VM before proceeding with these steps.
• If you encounter issues, consult the Proxmox VE documentation or seek help from the Proxmox community forums.