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Ubuntu 10.04 has a different version of LDAP so if you want to look for a tutorial make sure is 10.04 or because things have changed a lot.

Install the needed LDAP server packages and containing management utilities.

sudo apt-get install slapd ldap-utils

The schemas are .... In order to load this schemas run the following commands

sudo ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/ldap/schema/cosine.ldif
sudo ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/ldap/schema/nis.ldif
sudo ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/ldap/schema/inetorgperson.ldif

There should be a backend.ldif file within your backups. If for some odd reason this was not backed up then create a an LDIF file

vim backend.ldif

Copy and paste the following template.

#Load dynamic backend modules
dn: cn=module,cn=config
objectClass: olcModuleList
cn: module
olcModulepath: /usr/lib/ldap
olcModuleload: back_hdb

# Database settings
dn: olcDatabase=hdb,cn=config
objectClass: olcDatabaseConfig
objectClass: olcHdbConfig
olcDatabase: {1}hdb
olcSuffix: dc=cs,dc=wallawalla,dc=edu
olcDbDirectory: /var/lib/ldap
olcRootDN: cn=admin,dc=cs,dc=wallawalla,dc=edu
olcRootPW: '''{SSHA}sPKiAjzTE9jZ+SpTLocHD6pcm+j5icTm'''
olcDbConfig: set_cachesize 0 2097152 0
olcDbConfig: set_lk_max_objects 1500
olcDbConfig: set_lk_max_locks 1500
olcDbConfig: set_lk_max_lockers 1500
olcDbIndex: objectClass eq
olcLastMod: TRUE
olcDbCheckpoint: 512 30
olcAccess: to attrs=userPassword by dn="cn=admin,dc=cs,dc=wallawalla,dc=edu"   write by anonymous auth by self write by * none
olcAccess: to attrs=shadowLastChange by self write by * read
olcAccess: to dn.base="" by * read
olcAccess: to * by dn="cn=admin,dc=cs,dc=wallawalla,dc=edu" write by * read