OpenLDAP 2.4.35, released in early 2013, represents a stable milestone in the long-lived 2.4 series of the OpenLDAP project. This version refined critical features that defined the 2.4 era, such as and dynamic configuration ( cn=config ) , which moved the industry away from static text-file management toward real-time, directory-driven administration. Core Architectural Advancements
While earlier versions relied heavily on Berkeley DB (BDB), the 2.4 series introduced and refined the MDB (later LMDB) backend. LMDB offered significant performance boosts by eliminating the need for manual cache tuning, a major pain point in previous versions. Performance and Stability Openldap 2 4 35
By this version, the transition from slapd.conf to a dynamic LDAP-based configuration was mature. This allowed administrators to modify access control lists (ACLs) or load new backend drivers on the fly without restarting the service. OpenLDAP 2
A hallmark of the 2.4 series, this feature allowed multiple servers to act as providers simultaneously. Version 2.4.35 continued to stabilize the syncrepl engine, supporting complex topologies where any portion of a database could be replicated to other consumers across overlapping subtrees. A hallmark of the 2
OpenLDAP 2.4.35 benefited from a redesigned dispatcher that improved throughput on multi-processor systems, reportedly running up to than the older 2.3 series on similar hardware. It also featured expanded monitoring capabilities through back-monitor , allowing real-time tracking of cache usage and session information. Security Considerations
The release of 2.4.35 was situated in a period where OpenLDAP focused on high-availability and performance for enterprise-scale deployments:
While 2.4.35 was stable for its time, it is important to note that many vulnerabilities have been discovered in the 2.4 branch since its release: OpenLDAP Software 2.4 Administrator's Guide