Number of A-Records in Load Balancing with Multiple A-Records

Dan Mahoney, System Admin danm at
Sun Jun 11 14:31:53 UTC 2006

On Sun, 11 Jun 2006 mail at wrote:

DNS Round-robin is generally called "a poor man's load balancing".

If you've got 30 to 50 servers running, you're not too poor to pick up an 
alteon offa ebay :)


> Hi @ all,
> I am searching for some experiences with the quantity of A-records for one host.
> I would like to setup an simple load balancing environment with multiple A records in BIND 9.x.
> But any examples I found, described setups with only 3 or max. 8 A-Records.
> Is there someone who has some operating experience with environments that have
> about 30 or up to 50 A-Records for an FQDN?
> A further question is:
> In the BIND 9 Administrator Reference Manual they are talking about the behavior of the clients like this:
> "Most clients will use the first record returned and discard the rest."
> But what is about the rest? Are there any side-effects or known problems? Specialy something about resolving problems?
> I am thankful for any suggestions or tipps.
> Regards,
> Karsten


"It would be bad."

-Egon Spengler, "Ghostbusters"

--------Dan Mahoney--------
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