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Network booting is cool. Once you have setup everything you can stop juggling iso images in your virtual machine configs. Instead you just kick a network boot and pick whatever you want install from the boot menu delivered by the boot server.
This article is not about the basics of setting up a boot server. The internet has tons of tutorials on how to install a tftp server and how to boot your favorite OS from tftp. This article will focus on configuring network boot for libvirt-managed virtual machines.