global server load balancing with the domain name

[Chris Buxton]

On Apr 14, 2017, at 2:40 PM, McDonald, Daniel (Dan) <Dan.McDonald at austinenergy.com> wrote:
> 
> Setting up global server load balancing seems easy enough – just add ns records pointing at the load balancer and away you go:
>  
> example.com.     38400    IN            SOA        ns20.example.net. dan\.mcdonald.example.com. 2017011107 10800 3600 604800 3600
> example.com.     38400    IN            NS           ns1.example.com.
> example.com.     38400    IN            NS           ns2.example.com.
> test.example.com.             900         IN            NS           gslb1.example.com.
> test.example.com.             900         IN            NS           gslb2.example.com.
>  
> That works fine for test.example.com.  But when I go to production, I need to do it for example.com and www.example.com.  How do I delegate just the A record and not the SOA, TXT, MX, SPF, and NS records, nor any of the other entries in the zone.  As I recall, I can’t just delegate , as an example,  www.example.com, then use a CNAME for example.com.

You can't do this for example.com. Obviously, www.example.com is not a problem. Your GSLB device should have a work-around for the zone apex (example.com itself), such as a simple webserver (right on each GSLB, perhaps) that takes those web requests and redirects them to www.example.com. Then in your main zone (not on the GSLB), you would have a record set pointing that zone apex to each of those web servers.

Regards,
Chris Buxton