replicated cn=config

[Howard Chu <hyc@symas.com>]

Quanah posed this question about how to set up a bunch of replica 
servers that all use configurations replicated from the master as well. 
It wasn't perfectly obvious at first, so I'm posting this note to 
suggest an approach and get some reactions. I haven't tested this yet.

First of all, you cannot just replicate cn=config straight from a master 
to a slave server, because the slave will wind up with an identical copy 
of the master's configuration (and will then cease to be a slave). This 
means you must use some alternate tree, and map it into the slave's 
cn=config.

So here's a possible approach - on the master

   database ldif
   directory /some/path
   suffix cn=replica-config

On each slave
   database relay
   suffix cn=replica-config
   relay cn=config massage

Then either slurpd or syncrepl can be used to keep the slaves' 
configurations up to date.

--
 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
 Symas: Premier OpenSource Development and Support