Argh. Always include the URL. The code is available from http://pythondirector.sourceforge.net/
Anthony Baxter wrote I'm happy to announce the seventh release of Python Director.
Python Director is a pure python TCP load balancer. It takes inbound TCP connections and connects them to one of a number of backend servers.
Despite the version numbering (which looks scary), this is quite mature software - it's been in heavy use for well over 12 months, balancing FastCGI and HTTP connections to our backend Zope servers.
Features:
* async i/o based, so much less overhead than fork/thread based balancers. Can use either twisted or python's standard asyncore library (twisted is recommended, and asyncore support will be removed in a future version).
* Multiple scheduling algorithms (random, round robin, leastconns, leastconns+roundrobin)
* If a server fails to answer, it's removed from the pool - the client that failed to connect gets transparently failed over to a new host.
* xml based configuration file
* seperate management thread that periodically re-adds failed hosts if they've come back up.
* optional builtin webserver for admin
* webserver has methods suitable for both interactive and automated systems
Changes from 0.0.6 to 0.0.7
- You can specify a hostname of '*' to the listen directive for both the scheduler and the administrative interface to mean 'listen on all interfaces'. Considerably more obvious than '0.0.0.0'. Thanks to Andrew Sydelko for the idea. - New "leastconnsrr" scheduler - this is leastconns, with a roundrobin as well. Previously, leastconns would keep the list of hosts sorted, which often meant one system got beaten up pretty badly. - Twisted backend group selection works again. - The client address is now passed to the scheduler's getHost() method. This allows the creation of "sticky" schedulers, where a client is (by preference) sent to the same backend server. The factory function for schedulers will change to allow things like "roundrobin,sticky".
-- Anthony Baxter <anthony@interlink.com.au> It's never too late to have a happy childhood.
-- Anthony Baxter <anthony@interlink.com.au> It's never too late to have a happy childhood.