global server load balancing - subdomain forward - bind 8.2.3

[Kevin Darcy]

If a zone is delegated to multiple nameservers, then other nameservers will
fail over if one of those delegated nameservers is down. Not only that, but
*good* nameserver implementations will remember that the one nameserver is
down, and attempt to use it less frequently until it starts answering again.
I'm not sure what you're worrying about. Delegation is traditionally a lot
more resilient to failures than forwarding.


- Kevin

Super-User wrote:

> Kevin Darcy wrote:
>
> > Perhaps you should clarify what you mean by "global server load
> > balancing". My experience has been that this means the load-balancers run
> > simple DNS servers which will serve up different addresses for
> > www.test.com, depending on the respective loads on the various backend
> > servers. In that case, it shouldn't really matter much whether the
> > NS records are given out in round-robin order or not, because it's the
> > answers from the load-balancers which really steer the traffic.
> >
> > - Kevin
> >
> > Super-User wrote:
> >
> > > i want to use global server load balancing. i have a zone "test.com" in
> > > my
> > > dns. now i want forwarding only "www.test.com" to another dns. the
> > > problem
> > > is:
> > >
> > > 1. if i use:
> > > zone "test.com" {
> > > type forward;
> > > forward only;
> > > forwarders {x.x.x.x; y.y.y.y;};
> > > }
> > > -> the whole zone is forwarding (not only www.test.com) and i cant
> > > resolve
> > > game.test.com etc.
> > >
> > > 2. if i use:
> > > www.test.com.  IN  NS ns1.www.test.com.
> > > www.test.com.  IN  NS ns2.www.test.com.
> > > ns1.www.test.com.   IN  A x.x.x.x
> > > ns1.www.test.com.   IN  A y.y.y.y
> > > -> it use round robin and not forwarding to both dns.
> > >
> > > any ideas?
> > >
> > > thx
> > > lb
>
> thats right the answer from the lb steer the traffic.  but what happens if
> one load balancer is down (i have 2)?
> -> my dns ask the not running load balaner dns -> no answer.
> thats the reason why i want forwarding the zone -> both lb have the request
> from my dns and both (or the better one) could answer.
> in this case one of them could be down. so whats the solution (how could i
> forwarding a subdomain)?
>
> thx