How to install OpenLDAP Server on Debian or Ubuntu

Version 1.0
Author: Srijan Kishore <s [dot] kishore [at] ispconfig [dot] org>
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Last edited 01/Oct/2014

This document describes how to install and configure OpenLDAP in Debian/Ubuntu Server. I will use OpenLDAP to configure a corporate organizational structure through OpenLDAP.

LDAP stands for Lightweight Directory Access Protocol. As the name suggests, it is a lightweight protocol for accessing directory services, specifically X.500-based directory services. LDAP runs over TCP/IP or other connection oriented transfer services. The nitty-gritty details of LDAP are defined in RFC2251 "The Lightweight Directory Access Protocol (v3)" and other documents comprising the technical specification RFC3377

LDAP is a platform-independent protocol. Several common Linux distributions include OpenLDAP Software for LDAP support. The software also runs on BSD-variants, as well as AIX, Android, HP-UX, Mac OS X, Solaris, Microsoft Windows (NT and derivatives, e.g. 2000, XP, Vista, Windows 7, etc.), and z/OS.

This guide will work both in Debian/Ubuntu server. I do not issue any guarantee that this will work for you!

1 Preliminary Note

This tutorial is based on Debian 7.6 server, so you should set up a basic Debian 7.6 server installation before you continue with this tutorial. The system should have a static IP address. I use as my IP address in this tutorial and as the hostname. I am using root credentials for installations, you can use sudo before the commands if you are installing it without root.

Note:The guide can be used for both Ubuntu/Debian server.

2 Install OpenLDAP

2.1 OpenLDAP installation

We will install OpenLDAP as follows:

apt-get update  
apt-get install slapd ldap-utils

Put the password and press OK. I am using password howtoforge, input your desired password.

Confirm the password and press OK.

2.2 OpenLDAP Configuration

Now we will edit the configuration file to make the OpenLDAP server according to our environment.

nano /etc/ldap/ldap.conf

Give the entries as follows:
# LDAP Defaults

# See ldap.conf(5) for details
# This file should be world readable but not world writable.

BASE    dc=example,dc=com
URI     ldap:// ldap://

#SIZELIMIT      12
#TIMELIMIT      15
#DEREF          never

# TLS certificates (needed for GnuTLS)
TLS_CACERT      /etc/ssl/certs/ca-certificates.crt

Note in my case hostname was so my dc=example and dc=com

Save the file and run the following command to reconfigure the LDAP package.

dpkg-reconfigure slapd

It will ask some questionnaire, we will choose the values as follows:

Select No:

Select Ok:

Give any name as per your needs, in my case I am using Test-company as the company name. Further press Ok.

Give an administrative password, and confirm the same.

Select HDB and press Ok.

Select Yes.

Again select Yes and move the old database files.

We don't want to use LDAPv2 protocol so select No. Now we are done with the configuration, we can check that our installation have all gone well with the command:

ldapsearch -x

It will show output like this:

[email protected]:~# ldapsearch -x
# extended LDIF
# LDAPv3
# base <dc=example,dc=com> (default) with scope subtree
# filter: (objectclass=*)
# requesting: ALL

dn: dc=example,dc=com
objectClass: top
objectClass: dcObject
objectClass: organization
o: Test-company
dc: example

# admin,
dn: cn=admin,dc=example,dc=com
objectClass: simpleSecurityObject
objectClass: organizationalRole
cn: admin
description: LDAP administrator

# search result
search: 2
result: 0 Success

# numResponses: 3
# numEntries: 2
[email protected]:~#

It shows successful configuration for the OpenLDAP server.

3 phpLDAPadmin installation

We can administrate the OpenLDAP with commands, but to make it an easier task I will install phpLDAPadmin. We need to have an Apache server and php installed before phpLDAPadmin installation:

apt-get install apache2 php5 php5-mysql

Next we can install phpLDAPadmin as follows:

apt-get install phpldapadmin

Now we need to modify phpLDAPadmin in accordance to our server requirement so that it will get controlled through it, edit the file  /etc/phpldapadmin/config.php and give the values like this:

nano /etc/phpldapadmin/config.php

Values will be like this:

$servers = new Datastore(); $servers->newServer('ldap_pla'); $servers->setValue('server','name','Test-company LDAP'); $servers->setValue('server','host',''); $servers->setValue('server','base',array('dc=example,dc=com')); $servers->setValue('login','bind_id','cn=admin,dc=example,dc=com'); ?>

Note: In above file dc will vary according to your hostname, i have given my company name as Test-company you can use other name as per your choice.

Now open the link in any browser of your choice.

Press Login at left of the panel.

Put the password used at the time of modifying the LDAP, in my case user=admin(it is preselected) and password=howtoforge.

It will be your default welcome page.

4 Adding accounts in LDAP

Next we will create a test entry in the LDAP server and verify the settings in admin panel itself. Suppose we are in a corporate company and we want to classify different teams with  different team stucture, such as Teachnical-team, Accounts Department an HR department etc. Now click on + sign dc=example, dc=com and at cn=admin select Create a child entry.

To have such functionality in LDAP select Generic: Posix Group

Next you will be redirected as:

I am just taking an example, and adding a test entry for Technical-team as my group. Press Create Object.

Verify the things and Press Commit.

It will create the group As Technical-team, similarily we can create other groups as per our corporate structure.

We can check the groups under cn=admin similarily add other groups as per our needs.

Congratulations! Now we have successfully configured OpenLDAP in Debian Wheezy :)
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6 Comment(s)

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One of the things on my to-do list is making LDAP store ssh keys for user accounts.
I just need to find some time and documentation about managing the LDAP database to change it's structure a bit. Reading such tutorial after this one would make the subject more complete.

From: Talat

I don't understand why php5-mysql would be required for phpLDAPadmin, given that OpenLDAP uses HDB and the connector to MySQL is deprecated for OpenLDAP. Why did you need this here? Thanks.

From: lalit


Able to connect LDAP via client/browser and able to create new users but these users are not syncing to linux system.I am unable to find these users in ubuntu.Please advice.

From: Castor Mora

Excellent tutorial!!!!!!!!!!!!!!!!!!!!!! Thanks a lot..........................

From: Ivan

If you get template errors in phpldapadmin, then you just need to go to: /usr/share/phpldapadmin/lib/TemplateRender.php and change the line: $default = $this->getServer()->getValue('appearance','password_hash'); to this: $default = $this->getServer()->getValue('appearance','password_hash_custom'); 


From: Sameer Singh


Please tell me how can I add client machine (windows pc).