Right now we're using a kludgey system of having a webserver hit an inetd script that copies and fills in a template zone file, rsyncs it across servers, and reloads named. This is slow and somewhat unreliable.

It would be nice to be able to write to a MySQL server with slave or two instead and simply have the changes show up in subsequent DNS queries.

PowerDNS (http://en.wikipedia.org/wiki/PowerDNS) is one such server, which can use a variety of backends including RDBMSes. Do any readers have experience with this or a similar product? If so, what is the reliability and resource-intensity?