[olug] Border management / server farms

[Jay Swackhamer]

(disclaimer, I havent worked with load-balancing/cluster software on linux
up to this point, but have on other platforms)

There is some information that you might find usefull at
http://www.linuxvirtualserver.org/
http://lcic.org/load_balancing.html

What I would setup would be a virtual IP address for each web/database
server, that could be moved to an active server if the primary is down.
So that your users/applications dont have to be tied to a physical server,
and the IP could be moved for maintenance.

A simple solution would be to have the name server do a round-robin
assignment of names so that the IP addresses of active servers get cycled
through, and have the name server actively check the servers and re-move
the non-responding servers from the rotation.


>
> Howdy --
>
> Here's a pie in the sky question for you...
>
> Anyone have any experience high availability web/database farms?
>
> I want to have X web servers and Y databases. I need some magical
> device that can know when server(s) in the farm(s) are offline, happily
> continuing to route requests to the other server(s) that are online.
>
> Preferrably I'd use some slice of Linux magic. Alternately, I could
> spend $10K or whatever on some device from Cisco. This is all
> hypothetical at this point, looking at options.
>
> I'm just looking for ballpark info (product names) from anyone w/ any
> experience.
>
> (Yes, I know I could load multiple DNS entries, but I don't want to
> have to wait for DNS timeout(s) if server(s) are offline.)
>
> Thanks,
>
> j
>
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-- 
Jay Swackhamer
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