Here I am going to create a VM. Since I’ve never tried CentOS 5, I decided to give it a shot. It has the old good sysv init system, it’s old, not obsolete. By this examle I will show you how to create and manage QEMU/KVM virtual machine without GUI utilities. First of all create a virtual disk of the desired size. Here for example, we will create a 20 GB disk with the raw disk format: You can also try to use qcow2 format which gives you some additional benefits.