(Answer) (Category) OpenLDAP Faq-O-Matic : (Category) OpenLDAP Software FAQ : (Answer) Does slapd(8) support multi-master replication?
No (excepting dead experimental code) in all releases prior to 2.4.
Kurt@OpenLDAP.org, quanah@openldap.org
slapd(8) provides the single-master replication semantics promised by the X.500/LDAP service model, which ensures the directory service manages concurrency of update operations. Use of multi-master replication, as provided in some directory vendors, may lead to permanent inconsistencies in directory information which may harm directory applications which expect the X.500/LDAP's single-master service model. See the Internet-Draft draft-zeilenga-ldup-harmful-xx.txt for a discussion in this area.
OpenLDAP 2.4 has support for multi-master replication using syncrepl, which addresses many of the concerns Kurt raised. It requires reliable clock syncronization (e.g. NTP) between the participating servers.
quanah@openldap.org, hyc@openldap.org
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