Sending again, this time from an account actually subscribed to the list, doh :)

> From: Dave Knight <dave.kni...@icann.org>
> Date: July 9, 2010 4:39:38 PM EDT
> To: Tomasz Chmielewski <man...@wpkg.org>
> Cc: "bind-users@lists.isc.org" <bind-users@lists.isc.org>
> Subject: Re: GeoIP and maintaining high availability
> 
> On 2010-07-09, at 4:30 PM, Dave Knight wrote:
> 
>> Hi Tomasz,
>> 
>> On 2010-07-09, at 10:26 AM, 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.
>> 
>> I think that you're confusing two issues. 
> 
> On second read of your post I see that it's me that's confusing issues :)
> 
> You'll use GeoIP to direct European users to a European web server, and 
> Americans to an American one, etc. If one, or the other is down you want to 
> direct all users to the one that is up. 
> 
> A low TTL on the specific RRSet, ie
> 
> www.example.com.      600     A       192.0.2.1
> 
> combined with a script running on the nameserver which checks that the target 
> web server is up and talking sense, and modifies that RRSet if it is not... 
> 
> sounds like what you want.
> 
> Sorry for the noise.
> 
> dave

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