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 MOJAVE
dnsextd
dnsextd(8) BSD System Manager's Manual dnsextd(8)
NAME
dnsextd -- BIND Extension Daemon
SYNOPSIS
dnsextd
DESCRIPTION
dnsextd is a daemon invoked at boot time, running alongside BIND 9, to implement two EDNS0 extensions to the standard DNS protocol.
dnsextd allows clients to perform DNS Updates with an attached lease lifetime, so that if the client crashes or is disconnected from the net-
work, its address records will be automatically deleted after the lease expires.
dnsextd allows clients to perform long-lived queries. Instead of rapidly polling the server to discover when information changes, long-lived
queries enable a client to indicate its interest in some set of data, and then be notified asynchronously by the server whenever any of that
data changes.
dnsextd has no user-specifiable command-line argument, and users should not run dnsextd manually.
SEE ALSO
mDNS(1) mDNSResponder(8)
For information on Dynamic DNS Update, see RFC 2136 "Dynamic Updates in the Domain Name System (DNS UPDATE)"
For information on Dynamic DNS Update Leases, see http://files.dns-sd.org/draft-dns-update-leases.txt
For information on Long-Lived Queries, see http://files.dns-sd.org/draft-dns-llq.txt
BUGS
dnsextd bugs are tracked in Apple Radar component "mDNSResponder".
HISTORY
The dnsextd daemon first appeared in Mac OS X 10.4 (Tiger).
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