> Actually, I'd also be interested in any docs or information relating to LVM
> with COW as an alternative to loopback images. If I want to be able to
> shift my VM images about, can I do it with LVM?
Shift them about between machines? The ideal thing to do for that would be to
keep a copy of the base image on all machines and just copy the changes to
that around your cluster when migrating. I don't know how easy this is with
LVM... Anyone?
> The section on this in the
> manual (5.2) is a little sparse on this subject to say the least! Guess
> you're all too busy coding :o)
Yeah :-) This manual might get a bit fleshed out before the 2.0 release but I
was rather hoping someone who uses LVM would help out with the LVM
section ;-) I just use dedicated partitions for domains.
Cheers,
Mark
>
> Cheers,
> Paul
>
> On Tuesday 28 September 2004 07:23 am, Paul Dorman wrote:
> > Hi all,
> >
> > I wonder if anyone on the list has written any scripts to automate the
> > management of VMs with loopback images. Here's what I want to be able to
> > do:
> >
> > * Store existing physical machine file systems, or pristine installs in
> > loopback images on my Xen servers (something I'll do manually)
> >
> > * Run a script that will start a VM from one of these images,
> > automatically associate it with a loopback device, give it a name, RAM
> > allocation, network addresses, and set various internal parameters, such
> > as hostname, routes, etc., based on a set of arguments. So something like
> > "script <imagename> <hostname> <netconfigs> <RAM> <.. etc.
> >
> > * Have the same script take another argument that will cause it to clone
> > a filesystem image first before starting the VM, so that I can use a set
> > of images as VM templates. I intend to have a large collection of
> > templates which my developers can use to create VMs suited to whatever
> > project they are working on.
> >
> > * After a VM machine has been instantiated, I would like to be able to
> > start and stop it with simple "start hostname" and "stop hostname" kinds
> > of commands.
> >
> > * Have management tools so that I can for example shift a VM from one Xen
> > server to another (shift hostname xenservername). These would also be
> > used by load balancing scripts to shift machines around to manage
> > resources.
> >
> > I'd like to build a web-based management system for these scripts, so
> > that developers are free to create and control Xen VMs (though naturally
> > with limitations based on what the servers can handle -- so my bosses
> > will know when they need to buy me more servers :o) ).
> >
> > I don't see these as particularly difficult, but if someone has done them
> > already .... Also, I'd appreciate any thoughts you might have on
> > automation of this kind, particularly in terms of functionality and
> > practicalities.
> >
> > Thanks for your time!
> >
> > Paul
>
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