Xen users - Nov 2007 - moving from non-xen environment -> xen environment

Hi Folks,

I''ve been thinking of trying to migrate a production environment,
that''s
currently running on Debian Sarge, to a xen DomU  - sort of slipping Xen 
under an existing installation, if you will.

The motivation is to gain a bit more flexibility in using two low-volume 
servers - where one is now being used for production, the other for 
development.  I''d sort of like to move to an environment where I can:
- continue to use one server as a primary product server
- use the 2nd machine to backup the first, and as a development/staging 
environment

This suggests:
- use Xen on both machines
- run a single DomU on the primary machine, providing production services
- configure a DomU on the 2nd machine to provide hot-spare backup (using 
DRBD and hearbeat), albeit with reduced performance
- do development in a DomU on the 2nd machine - snapshot the production 
environment, then develop, and install by migration (albeit with some 
details on synchronizing data before migration still to be worked out)

It seems like the first step, though, is to slip a Xen Dom0 under my 
running production environment.

So.... any experience/suggestions on how to do this as painlessly as 
possible?  Comments on the general idea are welcome as well.

Thanks much,

Miles

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Miles Fidelman wrote:
> [...]
> So.... any experience/suggestions on how to do this as painlessly as
> possible?  Comments on the general idea are welcome as well.
- Debian sarge doesn''t have a libc good for Xen - the "good old
lib TLS
problem". Better go to Etch and use libc6-xen - for dom0 and domU.

- Google Ganeti is an interesting tool for managing mirrored systems
with drbd, and makes this easy to setup within minutes.
No heartbeat integration(yet?!), and failover is always with a little
bit of downtime, as they don''t do live migration less than a minute in
my tests.



Henning

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