Increasing the Size of My Ubuntu VM and Docker LV in Proxmox

I recently ran into some storage issues in my docker container, I was running out of space so none of my containers were playing nice - I should note, that proxmox didn't show any issues, as if unaware of the space the Logical Volume Docker was taking up.

To resolve the issue I had to perform several steps:

• Increase the disk allocation to the Ubuntu VM running Docker
• Recreate the physical partition to use the newly available storage
• Extend the logical volume to make use of the new partition size

Here is a step by step guide to the actions I performed, please be aware I reference my own partitions and volumes, make sure you verify everything you are taking action on to prevent data loss (backup before you proceed!):

Step 1: Increase the Virtual Disk Size in Proxmox

Log in to Proxmox Web Interface:
Open your web browser and log in to the Proxmox web interface.

Select the VM:
Navigate to the VM you want to resize.

Resize the Disk:

• Go to the "Hardware" tab.
• Select the disk you want to resize (usually scsi0, ide0, or virtio0).
• Click on "Resize Disk".
• Enter the additional space you want to add (e.g., +20G to add 20 GB).
• Confirm the resize operation.

Step 2: Verify Disk Space Allocation

Check Disk Layout:

lsblk

Note the partition of interest and the space used versus space available.

sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 2G 0 part /boot
└─sda3 8:3 0 98G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 49G 0 lvm /

As you can see I have increased my VM from 100GB to 200GB, but I need to extend my logical volume from 49G to take use of the space.

1. Recreate The Partition:
   To expand sda3 to use the additional space, you'll need to resize the partition and then expand the logical volume and filesystem.

Step 3: Recreate sda3 Partition

1. Backup Data: Ensure you have a backup of your data before proceeding.
2. Resize sda3 Using fdisk:
   • Inside fdisk:
     • Press p to print the partition table.
     • Note the starting sector of sda3.
     • Press d and then 3 to delete the third partition. (don't worry, you wont lose the data as you are just modifying the partition table)
     • Press n to create a new partition.
     • Select primary and partition number 3.
     • For the first sector, use the same starting sector as the deleted partition.
     • For the last sector, accept the default to use all available space.
     • Press w to write the changes and exit fdisk.
3. Reboot (if necessary): Sometimes, you may need to reboot the system for the kernel to recognize the new partition table.

Start fdisk on /dev/sda:

sudo fdisk /dev/sda

Check the Disk Layout: Verify your current disk layout one last time.

sudo lsblk

Step 4: Resize the Physical Volume (PV)

Resize the Physical Volume:

sudo pvresize /dev/sda3

Step 5: Resize the Logical Volume (LV)

Extend the Logical Volume:

• Check the name of the logical volume

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

Step 6: Resize the Filesystem

Resize the Filesystem:

For xfs:

sudo xfs_growfs /dev/ubuntu-vg/ubuntu-lv

For ext4:

sudo resize2fs /dev/ubuntu-vg/ubuntu-lv

Step 7: Reboot for Good Measure

sudo reboot

Hopefully you are up and running with no data loss! This took me approximately 15 minutes to resolve, but a good 30 minutes of research.