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Scott Jones wrote:
>
> Hi everyone,
>
> I've got a basic setup with 2 real servers and a single LVS-DR director. I
> have written a simple script that would allow one of the real servers to ARP
> for the VIP if the director was found to go down. This would allow the site
> to seem to remain up, without the purchase of an additional machine (my load
> can be easily handled by a single real server right now, I'm just after the
> redundancy)...
>
> My question is, would this be a very bad idea for any reason? Would client
> computers remember the arp address and then ONLY go to that particular real
> server after I get the director back up? How long to arp entries last?
The arp time-out is 30-90secs, so the router in front of your LVS will
have the wrong MAC address for the VIP for that time. There is a program
send-arp, which is used in the HA setup, which will send arps from your
real-server, flushing the routers arp cache for the VIP and which
you can use as part of your failover script.
Joe
--
Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
contractor to the National Environmental Supercomputer Center,
mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA
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