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% Using a the Xen Hypervisor to Supercharge OS Deployment
% Mike D Day (ncmike@us.ibm.com)
Hypervisor technology presents some promising
opportunities for optimizing Linux deployment.
We discuss modifying initrd and the init
process to work in cooperation with the Xen
hypervisor to create any number of unique
server instances by re-using a single system
image. By isolating a server's unique
properties into a set of patches to
initialization scripts and other selected
files, deployment of a new server can occur in
a few seconds. To capture changes to a
server's configuration that occur while it is
running, we discuss using an LVM snapshot to
hold changes to selected files. By separating
the initialization and file data that make a
linux server instance unique, that data can be
stored and retrieved in a number of ways. We
discuss storing and retrieving different
initialization patches over the network and
integration of these capabilities into the Xen
tools. Potential uses for the techniques
demonstrated in the paper include capacity on
demand, and new methods of provisioning
servers and workstations.
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