GeoIP and maintaining high availability

Mark Watts m.watts at eris.qinetiq.com
Fri Jul 9 15:28:10 UTC 2010


On Fri, 2010-07-09 at 16:26 +0200, Tomasz Chmielewski wrote:
> Hi,
> 
> I'm about to set up bind with GeoIP patches.
> 
> What I'm not sure, is how do you guys handle high availability?
> 
> Suppose I have zones for Americas and Europe, and a destination server 
> in Europe dies - how do you handle it so that new (i.e. web) requests 
> hit American servers only?
> 
> Set TTL to low values (i.e. 10 minutes max) and reconfigure the zones if 
> European servers are down? Something else?
> 
> I assume typical hosting, without access to sophisticated network 
> settings, like BGP.
> 
> 

The textbook answer is to use anycast, which is how ISC (among others)
provide redundancy for their F-root nameserver.

Failing that, you'd probably turn to simply having more than one server
in any location and employing more mundane clustering and load-balancing
techniques to share your DNS servers' I address(es) between several
physical servers.

Mark.

-- 
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg
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