Slaving from DNS masters behind LVS

[Phil Mayers]

On 13/02/13 15:34, Tony Finch wrote:
> Nick Urbanik <nick.urbanik at optusnet.com.au> wrote:
>>
>> I think that it is not necessarily always true that you should avoid a
>> load balancer.  Every day, our DNS caches are answering about 140,000
>> queries per second.  I think that it is rather hard to configure
>> resolvers to query only three machines yet still meet the demand
>> unless you either use very massive, expensive machines, or use load
>> balancers.
>
> Another option is to use anycast.
> http://www.nanog.org/meetings/nanog29/abstracts.php?pt=NjcxJm5hbm9nMjk=

In fact, you can do both. Our recursive DNS server is accessible via two 
IPs - one virtual IP, hosted on a load-balancer, and one anycast IP 
advertised conditionally (on port 53 being open locally) using BGP from 
each DNS server. This means you've got some diversity.