Load Balancer for DNS

[Baird, Josh]

Load balancing can also be used just to provide high availability for
your caching/resolver servers.  Often times, even though a resolver
client will allow you to provide multiple resolving servers, if the
primary resolver goes down the delay until the next resolver is tried
often cripples applications.  We load balance our resolvers for this
reason.  If one goes down, the load balancer removes it from the load
balancing pool within seconds and the client keeps chugging right along
with no interruption.

DNS is easy to load balance because it is not persistent in nature.  We
use F5 BigIP's to load balance our resolvers, but a free solution like
LVS would be sufficient as well.

Thanks,

Josh

-----Original Message-----
From: bind-users-bounces+jbaird=follett.com at lists.isc.org
[mailto:bind-users-bounces+jbaird=follett.com at lists.isc.org] On Behalf
Of Lightner, Jeff
Sent: Monday, April 05, 2010 10:04 AM
To: Alan Clegg; bind-users at lists.isc.org
Subject: RE: Load Balancer for DNS

That answer seems to imply that when load is high enough on existing
caching servers the traffic will go to the others.   Is that the case?
At what point does this occur?

-----Original Message-----
From: bind-users-bounces+jlightner=water.com at lists.isc.org
[mailto:bind-users-bounces+jlightner=water.com at lists.isc.org] On Behalf
Of Alan Clegg
Sent: Monday, April 05, 2010 10:58 AM
To: bind-users at lists.isc.org
Subject: Re: Load Balancer for DNS

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On 4/5/2010 2:06 AM, sasa sasa wrote:
> Hello everyone,
> 
> Any one used any load balancer for DNSs? any recommendation? it's 2
> caching-only DNSs, and I'd like to make a load balance between them
> using software.

I would recommend that before adding "load balancers" that you consider
the problem that you are actually attempting to solve.

For the cost of a "load balancing solution" you might be able to deploy
more caching servers that would probably work better in the long run..

AlanC
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