sheerdns is a master dns server whose zone records are stored on a One-Record-Per-File bases. Because of this, it is the simplest of any dns to configure, the easiest to update, and the most efficient for networks that experience a lot of updates (for example master servers for dynamic IP address ranges). You never have to restart it; any updates are available immediately without having to notify the sheerdns process. 来源: http://freshmeat.net/projects/sheerdns/?topic_id=149 sheerdns是一个主dns服务器，它的域记录保存在一个One-Record-Per-File（每文件一个记录）的库中。因此，它是最简单的dns配制，最容易更新，对于有大量更新的网络（如动态IP地址范围的主服务器）来说它是最高效的。你不必重新启动它，任何更新不用通知对应dns进程就可以立即生效。
