# Introduction Virtual machines are a convenient way to test,
debug or even audit different systems on one single host. This
is particularly helpful when you need to set up a machine for
which you do not necessarily have the hardware, or the access,
in a very cheap way. This tutorial show the different steps
required to set up a raw disk image like the one used by QEMU,
to either try, test, audit (or even assess) modifications done
to a particular NetBSD's environment, without having access to
the real hardware, or alter your day-to-day system, with the
risk of making it unusable. It is also a lot faster to test
modifications within a virtual machine. This tutorial deals with
two different point of views: * the host, which is the machine
and OS hosting the different VMs. * the guest(s), representing
the different systems emulated/hosted on the host, through QEMU.
# Setting up the environment To start our VM, we need some disk
space to provide an emulated hard drive. For QEMU, by default,
this is done through