> My question now is how to handle this from the POV of the service
> provider, specifically the change of IP. As I see it, we have two
> choices.
>> 1) Manipulate the LVM disk on the standby server after is it has been
> updated to give it the correct IP.
>> 2) Run the domUs in rfc1918 space, and use iptables on the dom0s to
> route packets as needed.
>> 1) has the advantage of simplifying the dom0, whereas 2) has the
> advantage of simplifying the sync process.
>> Opinions? And especially, is there a 3) (or even a 4) ) that hasn't
> occurred to me?
How about having a domU that does the iptables stuff and all the
"application" domUs live in rfc1918 space? The "virtual router"
domU could be identical on both sites if it had some smart way
of figuring out where it was running. For example, ping the
upstream router IP address for both providers and see which has
the lower TTL.
Later,
Kenn
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