pct-resize

Resize to absolute size

$ pct resize 100 rootfs 20G

$ pct resize 100 rootfs +10G

pct resize vmid disk size

pct resize changes the size of a Proxmox LXC container's storage volume. The filesystem inside the container is automatically resized along with the underlying storage.

vmid

The numeric ID of the container

The disk to resize (rootfs or mpN for mount points)

New size (absolute like 20G) or relative (like +10G)

Only size increases are supported for most storage types. Shrinking volumes may cause data loss and is not supported for all storage backends. The container can be running during resize.

pct resize is part of the Proxmox VE virtualization platform for managing LXC containers.

pct(1), pct-set(1)