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Crossroads is a daemon running in user space, and features extensive configurability, polling of back ends using wake up calls, status reporting, many algorithms to select the 'right' back end for a request (and user-defined algorithms for very special cases), and much more. Crossroads is service-independent: it is usable for any TCP service, such as HTTP(S), SSH, SMTP, and database connections. In the case of HTTP balancing, Crossroads can provide session stickiness for back end processes that need sessions, but aren't session-aware of other back ends. Crossroads can be run as a stand-alone daemon or via inetd, and features a management Web interface for monitoring and for modification of parameters. License: GNU General Public License v3 Changes:
The balancer control script xrctl was rewritten to use an XML configuration file describing all services. The management Web interface is much richer, allowing modification of more properties of the balancer and allowing addition or deletion of back ends. DOS protection was extended to delay or block client IP addresses that exceed a connection threshold. Resolved back end host names are cached to ease the load on DNS. Back end verification supports HTTP GET or TCP connects to ports other than the back end itself. Portability issues for gcc 3.4, Solaris, and 64-bit systems were solved.



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