Move CentOS 7 logical volume manager (LVM) partition to another disk. And then delete the old LVM partition.

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.

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

Qcow2 file grows overtime; even if we delete files and snapshots. It still does not reduce the file size. The only way to that is to fill the disk with zero and then convert the disk to qcow2.

First we need to shrink the partition, and then shrink the qcow2 file.

This section covers adding storage devices to a guest. Additional storage can only be added as needed.

Doing MySQL load balancing on HAProxy has several advantages; such as ip address restriction. Configuring MySQL to use HAProxy proxy protocol is a ticky part. It needs to know HAProxy ip address.