Initial support for Xend to automatically bind loop and ENBD devices is now in
the unstable tree.
To use a file for a domain's disk the syntax is:
'file:/path/to/file,target_dev,mode'
For ENBD (Disclaimer! The scripts for ENBD are untested and probably won't
work yet. If someone could test this on a non-production system that'd be
good):
'enbd:host:port,target_dev,mode'
Binding and unbinding these devices to local device nodes is done in the
scripts /etc/xen/{block-file,block-enbd}.
You can edit those scripts to change their behaviour. To add support for a
device of type "foo" you can just add a script /etc/xen/block-foo and a
config item in the Xend config.
This should already be useful, at least for file-based disks. It'd be nice to
have the ENBD script working and have some kind of iSCSI script at some
stage.
Cheers,
Mark
On Monday 27 September 2004 19:23, 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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