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== An Overview of Repository Based Installation ==
Linux distributions are essentially a collection of many different software packages combined with a Linux kernel. These packages are stored in ''repositories'' which may be accessed online to install and update Linux distributions. The key tools for performing these tasks on systems such as Red Hat Linux, Fedora and CentOS are called ''yum'' and ''rpm''. Other Linux distributions (such as Debian and Ubuntu use a different package management system which will be covered in [[whereBuilding a Debian or Ubuntu Xen Guest Root Filesystem using debootstrap]]).
In terms of creating a Xen guest domain the yum and rpm tools can be used to install the base root filesystem on a blank disk image or partition by downloading the necessary packages from an online repository. This contrasts with the approach described in previous chapters whereby the the root filesystem is simply copied from the host operating system
