In the process of upgrading to 2.4.38 (was able to work with the LTB group to resolve the repo issue there), created a slapd.conf, and converted to the slapd.d format successfully.  – this is initially on a test server.  Most of the slapd.conf was migrated over from the 2.4.23 configuration that is currently in production.

When starting slapd, receiving the following (and slapd does not start):

# /usr/local/openldap/libexec/slapd -u ldap -d 1 -F /usr/local/openldap/etc/openldap/slapd.d

52b1c516 @(#) $OpenLDAP: slapd 2.4.38 (Nov 27 2013 13:40:34) $

        clement@localhost.localdomain:/home/clement/build/BUILD/openldap-2.4.38/servers/slapd

ldap_pvt_gethostbyname_a: host=<server_name>, r=0

52b1c516 daemon_init: listen on ldap:///

52b1c516 daemon_init: 1 listeners to open...

ldap_url_parse_ext(ldap:///)

52b1c516 daemon: bind(7) failed errno=98 (Address already in use)

52b1c516 daemon: bind(7) failed errno=98 (Address already in use)

52b1c516 slap_open_listener: failed on ldap:///

52b1c516 slapd stopped.

52b1c516 connections_destroy: nothing to destroy.

Here is my slapd.conf:

#

# See slapd.conf(5) for details on configuration options.

# This file should NOT be world readable.

#

include         /usr/local/openldap/etc/openldap/schema/core.schema

#

## Added to support the inetOrgPerson objectClass

include         /usr/local/openldap/etc/openldap/schema/cosine.schema

include         /usr/local/openldap/etc/openldap/schema/inetorgperson.schema

include         /usr/local/openldap/etc/openldap/schema/java.schema

include         /usr/local/openldap/etc/openldap/schema/misc.schema

include         /usr/local/openldap/etc/openldap/schema/nis.schema

include         /usr/local/openldap/etc/openldap/schema/openldap.schema

# include               /usr/local/openldap/etc/openldap/pmi.schema

include         /usr/local/openldap/etc/openldap/schema/ppolicy.schema

include         /usr/local/openldap/etc/openldap/schema/2307bis.schema

include         /usr/local/openldap/etc/openldap/schema/printers.schema

# Define global ACLs to disable default read access.

# Do not enable referrals until AFTER you have a working directory

# service AND an understanding of referrals.

#referral       ldap://root.openldap.org

referral        ldap://<server_name>.test.ldap

pidfile         /var/lib/openldap/run/slapd.pid

argsfile        /var/lib/openldap/run/slapd.args

# Load dynamic backend modules:

# modulepath    /usr/local/openldap/libexec/openldap

# moduleload    back_bdb.la

# moduleload    back_hdb.la

# moduleload    back_ldap.la

# Sample security restrictions

#       Require integrity protection (prevent hijacking)

#       Require 112-bit (3DES or better) encryption for updates

#       Require 63-bit encryption for simple bind

# security ssf=1 update_ssf=112 simple_bind=64

# Sample access control policy:

#       Root DSE: allow anyone to read it

#       Subschema (sub)entry DSE: allow anyone to read it

#       Other DSEs:

#               Allow self write access

#               Allow authenticated users read access

#               Allow anonymous users to authenticate

#       Directives needed to implement policy:

# access to dn.base="" by * read

# access to dn.base="cn=Subschema" by * read

access to *

        by self write

        by users read

        by anonymous auth

#

# if no access controls are present, the default policy

# allows anyone and everyone to read anything but restricts

# updates to rootdn.  (e.g., "access to * by * read")

#

# rootdn can always read and write EVERYTHING!

#######################################################################

# BDB database definitions

#######################################################################

database        config

rootdn          "cn=admin,cn=config"

rootpw          {SSHA}_________________________

database        bdb

suffix          "dc=test,dc=ldap"

rootdn          "cn=ldapadmin,dc=test,dc=ldap"

# Cleartext passwords, especially for the rootdn, should

# be avoid.  See slappasswd(8) and slapd.conf(5) for details.

# Use of strong authentication encouraged.

rootpw          {SSHA}_________________________

# The database directory MUST exist prior to running slapd AND

# should only be accessible by the slapd and slap tools.

# Mode 700 recommended.

directory       /var/lib/openldap/openldap-data

# Indices to maintain

index   objectClass             eq

index   cn,sn,mail              eq,sub

index   departmentNumber        eq

index   automountKey            eq

index   entryCSN                eq

index   entryUUID               eq

index   gidNumber,memberUID     eq

index   uid                     eq

index   uidNumber,printerURI    eq

John D. Borresen (Dave)

Linux/Unix Systems Administrator

MIT  Lincoln Laboratory

Surveillance Systems Group

244 Wood St

Lexington, MA  02420

Ph: (781) 981-1609

Email: john.borresen@ll.mit.edu