With Red Hat Enterprise Linux, OpenLDAP uses Sleepycat Software's Berkeley DB system as
its on-disk storage format for directories. Earlier versions of
OpenLDAP used GNU Database Manager
(gdbm). For this reason, before upgrading an
LDAP implementation to Red Hat Enterprise Linux 4, original LDAP data should
first be exported before the upgrade, and then reimported
afterwards. This can be achieved by performing the following steps:
Before upgrading the operating system, run the command
/usr/sbin/slapcat -l
ldif-output. This outputs an LDIF
file called
ldif-output
containing the entries from the LDAP directory.
Upgrade the operating system, being careful not to reformat
the partition containing the LDIF file.
Re-import the LDAP directory to the upgraded Berkeley DB format
by executing the command /usr/sbin/slapadd -l
ldif-output.
