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 CENTOS
avahi-dnsconfd
avahi-dnsconfd(8) System Manager's Manual avahi-dnsconfd(8)
NAME
avahi-dnsconfd - Unicast DNS server from mDNS/DNS-SD configuration daemon
SYNOPSIS
avahi-dnsconfd [options]
avahi-dnsconfd --kill
avahi-dnsconfd --refresh
avahi-dnsconfd --check
DESCRIPTION
avahi-dnsconfd connects to a running avahi-daemon and runs the script /home/lennart/tmp/avahi/etc/avahi/dnsconfd.action for each unicast
DNS server that is announced on the local LAN. This is useful for configuring unicast DNS servers in a DHCP-like fashion with mDNS.
OPTIONS
-D | --daemonize
Daemonize after startup and redirect log messages to syslog.
-s | --syslog
Log to syslog instead of STDERR. Implied by --daemonize.
-k | --kill
Kill an already running avahi-dnsconfd. (equivalent to sending a SIGTERM)
-r | --refresh
Tell an already running avahi-dnsconfd to refresh the DNS server data. (equivalent to sending a SIGHUP)
-c | --check
Return 0 as return code when avahi-dnsconfd is already running.
-h | --help
Show help
-v | --version
Show version information
FILES
/home/lennart/tmp/avahi/etc/avahi/avahi-dnsconfd.action: the script to run when a DNS server is found or removed.
SIGNALS
SIGINT, SIGTERM: avahi-dnsconfd will shutdown. This is issued by passing --kill to avahi-daemon.
SIGHUP: avahi-dnsconfd will refresh the DNS server data.
AUTHORS
The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>; Avahi is available from http://avahi.org/
SEE ALSO
avahi-daemon(8), avahi-dnsconfd.action(8)
COMMENTS
This man page was written using xml2man(1) by Oliver Kurth.
Manuals User avahi-dnsconfd(8)