Re: LDAP replication

[Mike Lovell <mike@dev-zero.net>]

Mike wrote:
> I'm currently working on setting up replication between two LDAP
> servers.  I understand with OpenLDAP 2.4 this requires the use of
> syncrepl.  I have read that it supports push and pull replication (as
> well as the wizzy-cool N-way) but I was wondering if anyone could advise
> how this works at the transport layer.
>
> From reading through the docs, I infer that with pull the slave
> periodically makes a TCP connection to the master in order to check for
> changes and with push, the slave makes a persistent TCP connection to
> the master, over which updates are propogated from the master.  Is this
> correct?
>
> I would like to know if there is a way to initiate the TCP connections
> from the master to the slave as this would make life a little easier for
> me?
>   
AFAIK, you are correct on the connections. I set up a replication system 
using refreshAndPersist and the client still initiates the connection to 
the master. There is some documentation in the OpenLDAP 2.4 Admin Guide 
that give a possible way around this. It is in section 18.2.4 and is 
called Syncrepl Proxy Mode 
(http://www.openldap.org/doc/admin24/replication.html#Syncrepl%20Proxy%20Mode). 
I have never done it but hopefully that points you in the right direction.

a different mike