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Properly Sizing an x86 Server for Internet DNS?

 
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Operating Systems Linux Gentoo Properly Sizing an x86 Server for Internet DNS?
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Old 04-11-2007
Properly Sizing an x86 Server for Internet DNS?
Where I work, we have to very old Alpha boxes running OpenVMS 7. They also have Multinet and are using the BIND component for DNS services. We are planning on retiring those boxes and replacing them with x86 servers running Linux. I've decided to go with Gentoo Linux for this and I've inherited two old boxes (A PIII >1GHz system and an old PIII quad Xeon 500MHz system) to do this with.

My concern is that my co-workers are adamant that the x86 systems won't be able to to keep up with the demand (we host about 70 domains in DNS) the way the Alphas did. My suspicion is that these x86 systems are just fine. However, what I really want to know is where the real utilization for DNS comes in. Is it CPU heavy? Is it RAM heavy? Or is it I/O heavy? I would suspect RAM first and CPU second based on what I've seen at home. But to be honest, in my experience DNS has been a pretty low resource service to run.

I honestly don't see our organization as being that big and 70 domains seems like a very small load even for the PIII boxes I just got. But, I'd be happy with any insight anyone here can provide.
 
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LEARN ABOUT DEBIAN

mdns-scan

MDNS-SCAN(1)						      General Commands Manual						      MDNS-SCAN(1)

NAME

       mdns-scan - Scan for mDNS/DNS-SD services published on the local network

SYNOPSIS

       mdns-scan

DESCRIPTION

       mdns-scan  is  a  tool  for  scanning for mDNS/DNS-SD published services on the local network. It issues a mDNS PTR query to the special RR
       _services._dns-sd._udp.local for retrieving a list of all currently registered services on the local link.

OPTIONS

       mdns-scan has no commandline options.

NOTES

       mdns-scan is not a good mDNS citizen since it queries continuously for services and doesn't implement features like Duplicate  Suppression.
       It is intended for usage as a debugging tool only.

       mdns-scan  is incomplete since it doesn't resolve mDNS services for you - it just dumps their PTR RRs. To understand these records you need
       minimal knowledge of DNS-SD and how it works.

       mdns-scan does not terminate on its own behalf. It scans for services continuously until the user kills it by pressing C-c.

       mdns-scan does not rely on a local mDNS responder daemon. It has no dependencies besides the GNU libc. It has been tested on Linux only.

       mdns-scan does NOT scan for local mDNS enabled hosts or A/AAAA RRs, it scans for DNS-SD registered services, nothing else.

SEE ALSO

       mDNSResponder(8)

AUTHOR

       mdns-scan has been written by Lennart Poettering <mzqrovna@0pointer.de>

0.4								   Jan 21, 2004 						      MDNS-SCAN(1)