Syncrepl replication from multi-master OpenLDAP

[Simon ELBAZ <selbaz@linagora.com>]

Hi,

I am trying to setup data and cn=config replication on a syncrepl slave 
from an OpenLDAP multi-master.

The replication is fine (data and config replicate).

However, I want to override olcSyncrepl attributes on the syncrepl 
replica (particularly the provider value to use an IP address reachable 
from outside the multi-master LAN).

I have tried exattrs=olcSyncrepl but as mentionned in 
(https://www.openldap.org/lists/openldap-technical/201508/msg00124.html), 
the olcSyncrepl attribute gets wiped:

dn: olcDatabase={1}mdb,cn=config
.....
olcSyncrepl: {0}rid=006 provider=ldap://<IP address> binddn="******" 
bindmethod=simple      credentials="*****" searchbase="*****" 
type=refreshAndPersist      interval=0 0:00:00:10 retry="5 5 300 5" 
timeout=1

Is there a way to achieve the overriding of olcSyncrepl attribute on the 
syncrepl server ?

Thanks for your help

Simon Elbaz