05-23-2013
DNS Servers should be very reliable, since they mostly just read a UDP packet, update the local data store and send a UDP packet. Excess load causes UDP packet loss.
DNS servers can be configured in parallel on different hosts, so load is spread and failed servers are skipped. One is master and the rest get their domain data from it over tcp.
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LEARN ABOUT CENTOS
ldns-notify
ldns-notify(1) General Commands Manual ldns-notify(1)
NAME
ldns-notify - notify DNS servers that updates are available
SYNOPSIS
ldns-notify [options] -z zone servers
DESCRIPTION
ldns-notify sends a NOTIFY message to DNS servers. This tells them that an updated zone is available at the master servers. It can perform
TSIG signatures and it can add a SOA serial number of the updated zone. If a server already has that serial number it will disregard the
message.
OPTIONS
-z zone
The zone that is updated.
-h Show usage and exit
-v Show the version and exit
-s serial
Append a SOA record indicating the serial number of the updated zone.
-p port
Use port as destination port (default the DNS port 53) for the UDP packets.
-y key:data
Use the given TSIG key and base64-data to sign the NOTIFY. Uses the hmac-md5 algorithm.
-d Print verbose debug information. The query that is sent and the query that is received.
-r num Specify the maximum number of retries before notify gives up trying to send the UDP packet.
EXIT CODE
The program exits with a 0 exit code if all servers replied an acknowledgement to the notify message, and a failure exit code otherwise.
AUTHOR
Written by the ldns team as an example for ldns usage.
REPORTING BUGS
Report bugs to <ldns-team@nlnetlabs.nl>.
COPYRIGHT
Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
POSE.
9 Jan 2007 ldns-notify(1)