Load Balancing Question...

Auteria Wally Winzer Jr. wallyw at NBCi.COM
Mon Apr 24 23:24:48 UTC 2000


I want to test our load balancer scheme, but only with
1/4 of the servers against the load balancer box, not all
8 servers (currently in rotation).  The present scheme is
DNS round-robin.  It looks something like this:

Domain snaptest.com
home    IN    A    205.205.205.61
            IN    A    205.205.205.62
            IN    A    205.205.205.63
            IN    A    205.205.205.64
            IN    A    205.205.205.65
            IN    A    205.205.205.66
            IN    A    205.205.205.67
            IN    A    205.205.205.68

Round-Robin works as expected.  The TTL is set
for 15 minutes.  Now, I have a load-balancer, which
its IP Address is 205.205.205.60.  All 8 of my web
servers are bound to my load balancer's virtual LAN.
What I'd like is to have 1/4 of each web server tested
instead of all 8.  For example.  The load balancer is set
to 205.205.205.60.  When DNS does its round-robin
I want to see the following:

Server:  localhost
Address:  127.0.0.1

Name:    home.SnapTEST.COM
Addresses:  205.205.205.60, 205.205.205.61, 205.205.205.62,
                   205.205.205.60, 205.205.205.63, 205.205.205.64,
                   205.205.205.60, 205.205.205.65, 205.205.205.66,
                   205.205.205.60, 205.205.205.67, 205.205.205.68

The load balancer will always be first, then 2 of the web servers.
When you query home again, DNS will round-robin and the next
set of IP's will display the following:

Server:  localhost
Address:  127.0.0.1

Name:    home.SnapTEST.COM
Addresses:  205.205.205.60, 205.205.205.63, 205.205.205.64,
                   205.205.205.60, 205.205.205.65, 205.205.205.66,
                   205.205.205.60, 205.205.205.67, 205.205.205.68,
                   205.205.205.60, 205.205.205.61, 205.205.205.62

And so on.  I don't wish to use multiple CNAMES, only A Records
(if possible).  My question is:

IS THIS HUMANLY POSSIBLE FOR BIND 8?

I've tried many combinations, but to no avail.

Your response is greatly appreciated.  I thought I knew BIND
exceptionally well, but I guess I don't know it as well as I thought.

- Wally Winzer Jr.




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