website redundancy.

[Jeremy C. Reed]

On Thu, 17 Apr 2008, Beavis wrote:

>    can someone point me out on some resource that can help me setup
> some a zone with multiple entries of say "www" in order to provide
> some sort of round-robin. I'm looking at the following scenario.
> 
> 
> www1 - <ip-address1>
> www2 - <ip-address2>
> www3 - <ip-address3>
> 
> and have it load-balance. is there such feature for bind?

Yes, DNS provides a simple technique like that.

The BIND ARM documentation has an explanation and example. See
http://www.isc.org/sw/bind/arm94/Bv9ARM.ch03.html#id2568040
(Also more details in the ARM about the ordering.)

I see you use Google mail. You can see real world example of this by doing 
a dig of googlemail.l.google.com. -- and you will see multiple records for 
same name. And then if you ping it a few different times, you may see 
different IPs each time.

As the ARM documents this is a "primitive form of load balancing". It is 
not a true load balancer.

  Jeremy C. Reed
  ISC Sales & Support Engineer