proxmox
vm's
vm
virtualization

Extending Disks¶

You do not need to unmount the root partition to extend it with this method.

You may or may not need to shut down the VM for the qm resize. I haven't yet tested without shutting down first, I'll try it next time and update this document accordingly.

First in proxmox resize the image:¶

qm resize <vmid> <disk> <amount>

Example

qm resize 116 virtio0 +32G

Next launch vm and run¶

Resize the partition in the partition table with fdisk or parted, I use fdisk:

fdisk /dev/vda
delete partition 3 (or whichever is the LVM partition)
recreated partition 3 at the same start sector, use the new end sector

DO NOT ERASE THE LVM INFORMATION!

Partition #3 contains a LVM2_member signature. 
 Do you want to remove the signature? [Y]es/[N]o: N

Resize the LVM partition you edited with parted or fdisk

pvresize /dev/vda3

Next extend it to use the free space:

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

Finally resize2fs

resize2fs /dev/ubuntu-vg/ubuntu-lv

Done.