[horde] memcache session pooling

[Michael M Slusarz]

Quoting Justin Wainwright <jwain at umd.umich.edu>:

> I'm looking for some info on the definitive way to set up multiple  
> horde servers with memcache session handlers to allow failover in  
> case one (or more) servers in the pool become unavailable.  I have  
> the memcache extension loaded as well as setting up pooling with a  
> list of servers in the $conf['memcache']['hostspec'] config  
> parameter of conf.php and a list of servers in the session_save_path  
> of php.ini- the result was either failure to authenticate or being  
> intermittently passed between servers asking for re-authentication  
> numerous times while moving through horde.
>
> I am using the latest CVS code (as of two days ago anyhow) so the  
> latest consistent hashing code should be in effect.  Currently we're  
> using round-robin DNS resolution for the server pool, but we  
> eventually plan on putting the horde servers behind a load balancer  
> using sticky sessions.
>
> Any help that you can offer would be greatly appreciated.

This has to be done at the memcache PECL level, not the Horde level.   
You will need memcache v3 (which is beta).  See  
http://cvs.php.net/viewvc.cgi/pecl/memcache/README?revision=1.3.2.1&view=markup

michael

-- 
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Michael Slusarz [slusarz at horde.org]