Hi,
I'm trying to take a production system, and create a hot-spare - using
DRBD and Xen live migration.
Pretty much all of the documentation I've seen talks about starting with
two bare-iron boxes, and setting up a replicated environment.
What I haven't seen is any guidance on whether one can "insert" DRBD
into a production environment (presumably with a reboot somewhere in
there), and then have a backup machine sync to the existing one.
Our current production system is pretty much vanilla Debian, with
servers on top of it. What I'm envisioning is a sequence something like:
- set up a Dom0 and DomU on the new machine - install the O/S, servers,
and application code into the new DomU
--- build this with the DRBD driver installed, but not replicating
anywhere (is this doable?)
- take the old machine down
- set up the new machine with all the old IP addresses and such
- copy all the user-level data to the new environment
- bring up the new environment -- with the DomU essentially looking just
like the old environment
- rebuild the original machine with Xen and DRBD installed - this
becomes the backup machine
- do something to have DRBD copy the new DomU production environment to
the backup machine
- enable live migration
Has anybody done something like this? Can you offer any guidance and/or
pointers to HOW-TO writeups?
Thank you very much,
Miles Fidelman
--
In theory, there is no difference between theory and practice.
In<fnord> practice, there is. .... Yogi Berra
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