Growing a VM's system disk

This process will change during policy/tpa-rfc-73-tails-infra-merge-roadmap and this page should be updated when that happens.

These are instructions for growing the size of a VM's system disk. For these disks, there are 2 levels of LVM:

1. A logical volume is defined in lizard as /dev/lizard/[VM]-system and maps to /dev/vda inside the VM.
2. The /dev/vda is partitioned inside the VM and /dev/vda2 is made an LVM physical volume. That physical volume is a part of the "vg1" volume group and a "root" logical volume is created in that group, providing /dev/vg1/root.

Attention: these instructions do not apply to data disks, as their partitioning scheme is different from system disks.

Instructions

Please, double check these instructions before running them to make sure the partitioning scheme makes sense for the case.

Resize the system disk in the host:

VM=www
AMOUNT=2G
sudo virsh shutdown ${VM}
# wait for VM to shutdown, then:
sudo lvresize -L+${AMOUNT} /dev/lizard/${VM}-system
sudo virsh start ${VM}

SSH into the VM:

ssh ${VM}.lizard

Resize the block device and LVM volumes from inside the VM:

sudo parted /dev/vda resizepart "2 -1s"
sudo pvresize /dev/vda2
sudo lvresize -l+100%FREE /dev/vg1/root
sudo resize2fs /dev/vg1/root

This should be enough!