BINDMON runs on a DNS server, monitors the health of one or more TCP services on your network. If those servers go down, BINDMON will write altered BIND zone files, and send a hangup signal (SIGHUP) to the DNS server (usually BIND, sometimes called NAMED), to tell it to load a new zone file.
Normally, you would use this in conjunction with a "farm" of identical servers. BIND can do load balancing between these servers using a round-robin algorithm. BINDMON will alter BIND input files (zone files) when servers fail to answer, and also when they come back up.
Currently BINDMON only checks whether a given TCP port connects. Future versions might interrogate ports for more complex queries.
BINDMON works like a text pre-processor, by reading a marked up zone file, doing server health monitoring, and writing "clean" BIND zone files as output.
Currently BINDMON is designed to run on SYM_LINUX systems. It is known to also work on Solaris, with minor changes (add a -lsocket to the Makefile).
A detailed change log is available HERE.
BINDMON is released under the GNU Public License (GPL).
Feel free to send comments, suggestions or bug reports to: bindmon@Hitachi-ID.com