Resize Image

ex: lxc 104

pct list
pct stop 104
e2fsck -fy /var/lib/vz/images/104/vm-104-disk-0.raw
resize2fs /var/lib/vz/images/104/vm-104-disk-0.raw 40G
lvreduce -L 40G /var/lib/vz/images/104/vm-104-disk-0.raw

edit configuration file

nano /etc/pve/lxc/104.conf

Replace

rootfs: local:104/vm-104-disk-0.raw,size=50G >> rootfs: local:104/vm-104-disk-0.raw,size=40G