table align=left cellpadding=0 cellspacing=0 width=92 height=40 style=margin-top:0px;margin-bottom:0px;trtdimg class=teaser-image-odd src=http://images.howtoforge.com/images/teaser/xen.gif width=89 height=40 alt= //td/tr/tablepbParavirtualization With Xen On CentOS 5.4 (x86_64)/b/ppThis tutorial provides step-by-step instructions on how to install Xen (version bb3.0.3/b/b) on a bbCentOS 5.4/b/b (x86_64) system. Xen lets you create guest operating systems (*nix operating systems like Linux and FreeBSD)* so called virtual machines or span class=systemdomU/spans* under a host operating system (span class=systemdom0/span).Using Xen you can separate your applications into different virtualmachines that are totally independent from each other (e.g. a virtualmachine for a mail server* a virtual machine for a high-traffic website* another virtual machine that serves your customers' web sites* avirtual machine for DNS* etc.)* but still use the same hardware. Thissaves money* and what is even more important* it's more secure. If thevirtual machine of your DNS server gets hacked* it has no effect onyour other virtual machines. Plus* you can move virtual machines fromone Xen server to the next one./p