Changes

A common In order to boot and run a Xen configuration involves mounting the root filesystems for domainU guests from guest domain a remote server using NFS key requirement (for details on setting up such amongst other items) is a configuration read [[Creating root filesystem populated with the files and Booting a directories necessary for the guest operating system to function. One of the most flexible Xen Guest domainU using configurations involves the installation of the root filesystem on an NFS Mounted Root Filesystem]]server such that it can be accessed and booted on a client system. This approach is of particular value use when it is necessary the need to migrate a Xen guest domain domainU guests from one system host to anotherarises. Since both the original host and the target host to which the guest is migrating need access to the domainU's root filesystem, NFS provides an ideal mechanism for achieving this by allowing the root filesystem located on the NFS server to be mounted on both client hosts.

Unfortunately, support for In order to boot a Xen guest domain with an NFS mounted root filesystems filesystem a version of the Linux kernel with root NFS support is disabled required. Unfortunately this functionality is not enabled by default in most Linux standard kernels for security reasons. Before embarking on such a Xen configuration it It is necessary, therefore, to build a custom Xen kernel with NFS root filesystem support build-inthis capability enabled. The purpose of In this tutorial is to we will work through the creation an example of building a custom Xen CentOS 5.1 kernel with NFS root filesystem support for a CentOS 5 system.