Perlbal is a single-threaded event-based server supporting HTTP load balancing, web serving, and a mix of the two. One of the defining things about Perlbal is that almost everything can be configured or reconfigured on the fly without needing to restart the software. A basic configuration file containing a management port enables you to easily perform operations on a running instance of Perlbal. WWW: http://www.danga.com/perlbal/