How to shrink logical volume (LVM) using SystemRescueCD?

Shrinking logical volume (LVM) must go through several steps. Unlike standard partition (ext4 file system). In order to shrink root logical volume, we must boot into a live CD like SystemRescueCD. And then shrink the volume from there.

How to reset linux root password with SystemRescueCD?

Sometimes we forget root password and needs to reset. One of the approach is to reset via SystemRescueCD.