[Zope-Annce] Seventh version of Python Director available
anthony at interlink.com.au
Fri Oct 10 02:01:01 EDT 2003
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
* 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,
* 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
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 at interlink.com.au>
It's never too late to have a happy childhood.
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