On 13 Dec 2006, at 11:41, Kenn Humborg wrote:
>> 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?
2a though, at best, and it was considered.
> 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.
Yeah, or have its IP passed to it at boot time - that's a solvable
problem, but it's debatable what having that domU brings you, as
against having iptables run on the dom0.
Niall
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