LXD Increase ZFS loop Storage

Today I had the need to grow a loop device which was the root of a ZFS that was hosting several LXC managed via LXD.

I discovered that LXD doesn't let you directly grow a loop backed ZFS pool, but you can do so with:

sudo truncate -s +XXXG /var/lib/lxd/disks/<POOL>.img  sudo zpool set autoexpand=on lxd  sudo zpool online -e lxd /var/lib/lxd/disks/<POOL>.img  sudo zpool set autoexpand=off lxd