[SOLVED] OpenLdap. Switch to mdb-backend (Memory-Mapped Database)

Issue

I`ve installed OpenLdap v.2.4.39 for Debian 7. But during setup I have only 2 option for backend: BDB and HDB.

But I want to use MDB (http://www.openldap.org/doc/admin24/backends.html). AFAIK it is stable. How to choose it as backend?

Thank you!

PS. i can see mentions about hdb in below files:

/etc/ldap/slapd.d# grep -nr hdb *
cn=config/cn=module{0}.ldif:7:olcModuleLoad: {0}back_hdb
cn=config/olcBackend={0}hdb.ldif:3:dn: olcBackend={0}hdb
cn=config/olcBackend={0}hdb.ldif:5:olcBackend: {0}hdb
cn=config/olcDatabase={1}hdb.ldif:3:dn: olcDatabase={1}hdb
cn=config/olcDatabase={1}hdb.ldif:6:olcDatabase: {1}hdb

But I am not sure if I can edit them.

Solution

In Debian the MDB backend has been enabled since slapd-2.4.39 which is available since Debian jessie (the code-name for the current testing distro).

assuming, that you are using Debian/stable (aka wheezy), the answer is simple:

your version of slapd has been built without mdb support, so you cannot use it.

if you are using slapd>2.4.39 (which seems to be the case according to your comment), you must configure the backend manually (as there is no debconf template yet that supports MDB).

checkout man slapd-mdb

Answered By - umläute