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To deploy an open-source LDAP directory server, install and configure OpenLDAP, choose a stable directory namespace, add entries, set access controls, enable TLS, and then connect clients. This guide uses Ubuntu Server’s slapd implementation and tools from ldap-utils; package names, paths, and service settings may differ on other distributions. Ubuntu presents installation, access control, replication, users and groups, TLS, backups, and client setup as a sequence of related tasks in its OpenLDAP documentation.
Plan the directory before installing
An LDAP directory is more than a running daemon. A safe deployment also needs a defined namespace, deliberate permissions, protected network connections, client integration, and a tested recovery plan.
Choose the base DN
The base distinguished name (DN), also called the suffix, is the top of the directory tree. Ubuntu’s package setup derives a default suffix from the host domain; its example is dc=example,dc=com. Choose the intended domain and verify the resulting base DN before adding real entries: reconfiguring the suffix after installation discards the existing database. The Ubuntu installation guide explains the package setup and suffix.
Decide who and what will use it
List the applications and machines that need directory data, what each identity needs to read or change, and which administrators will manage the service. LDAP server installation alone does not make client machines use the directory; client-side NSS/PAM or application configuration and testing are separate work.
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Install OpenLDAP on Ubuntu Server
- Install the server daemon and command-line utilities:
sudo apt install slapd ldap-utils. - Set an administrator password when package setup prompts you. For the sample suffix
dc=example,dc=com, the database administrator DN iscn=admin,dc=example,dc=com. - Record the suffix and administrator DN you actually configured. Do not assume the example domain matches your server.
The package creates a minimal configuration, a database instance, and an administrator DN. Ubuntu notes that leaving the password blank creates an administrator entry without a password and requires local SASL EXTERNAL access as root. That is not an appropriate casual choice for a network-facing service. See Install and configure LDAP.
Manage configuration through cn=config
Ubuntu’s packaged OpenLDAP setup stores runtime server configuration in the cn=config configuration database. Change it with LDAP operations; do not directly edit the generated LDIF files in /etc/ldap/slapd.d. OpenLDAP’s 2.4 Administrator’s Guide describes this dynamic configuration system and notes that changes generally take effect without restarting the daemon. It describes the older slapd.conf approach as deprecated in that guide’s version. Components that depend on unsupported or contributed modules can have additional requirements; check those separately. Sources: Ubuntu’s installation guide and the OpenLDAP Software 2.4 Administrator’s Guide.
Create the directory tree and add entries
Keep the initial structure small
A straightforward starting layout has organizational units such as ou=People and ou=Groups beneath the chosen suffix, with user and group entries below them. Use LDIF (LDAP Data Interchange Format) to describe entries, then add them with ldapadd. Ubuntu’s user-and-group example uses the inetOrgPerson, posixAccount, shadowAccount, and posixGroup object classes.
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Check identifiers and verify what was added
- Choose numeric UIDs and GIDs that do not collide with local system accounts on the machines that will use them; Ubuntu explicitly warns about these collisions.
- Use
ldapsearchwith a specific filter to confirm that an entry is present and its attributes are as intended, rather than treating a successful add as sufficient verification. - Use
ldappasswdto replace any placeholder or invalid initial password before relying on an account.
The exact required attributes depend on the object classes and services you select. Follow Ubuntu’s users and groups guide for its LDIF example and management workflow.
Set access controls before exposing useful data
Access control lists (ACLs) decide what anonymous clients, authenticated users, applications, and administrators can read or change. Ubuntu’s example ACLs allow anonymous authentication access to userPassword so a user can bind, permit an authenticated user to change their own password, and deny other users access to that attribute. It also demonstrates read access behavior for other directory data. These are examples to inspect, not a policy to copy without checking your data and applications.
- Review both database-specific and frontend rules: the effective permissions depend on both.
- Check rule order; an earlier matching rule can affect the outcome of later ones.
- Remember that a database’s root DN already has full rights to that database.
- Test the intended read and write behavior using the kinds of identities your clients will actually use.
Ubuntu’s LDAP access-control guide describes its example rules and configuration approach.
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Enable and verify TLS for network connections
A simple bind without transport security sends credentials in clear text. Ubuntu’s documentation states: “A simple bind without some sort of transport security mechanism is clear text, meaning the credentials are transmitted in the clear.” Configure TLS before sending simple-bind credentials over a network.
Choose StartTLS or a separate LDAPS listener
| Option | How it works in Ubuntu’s guide | What to check |
|---|---|---|
| StartTLS | Upgrades a connection on the LDAP listener to use TLS. The guide tests it with ldapwhoami -x -ZZ -H ldap://…; enabling a separate listener is not required for StartTLS. |
Configure the client to trust the issuing CA and validate that the certificate name matches the server name it connects to. |
| LDAPS listener | Uses a separate listener. Ubuntu’s guide says to add ldaps:/// to SLAPD_SERVICES and restart slapd to enable it. |
Confirm that clients support and use the listener, and that certificate trust and server-name validation succeed. |
Configure certificates and test the client path
Ubuntu’s TLS procedure configures the CA certificate, server certificate, and private-key file in cn=config. Ensure the service account can read the private key while keeping its permissions restricted. A connection test should validate the TLS handshake and certificate, not merely show that the server responds. Ubuntu’s example command is ldapwhoami -x -ZZ -H ldap://server.example.com; use the real server name and ensure the client trusts the appropriate CA. See LDAP and Transport Layer Security (TLS).
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Connect applications and Ubuntu clients
Configure each consumer separately. Ubuntu identifies SSSD and nslcd as client-side options for Ubuntu systems, and documents ldapscripts as one way to begin managing UNIX users and groups. Its client example uses StartTLS. Select an approach that fits the client environment; the Ubuntu documentation names both SSSD and nslcd but does not establish a comparative performance benchmark.
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For every client, verify the server address, base DN, TLS behavior, bind identity if one is used, and the directory attributes the application expects. Test both successful lookups and expected denials. An installed LDAP server does not automatically alter a client’s NSS/PAM configuration or application authentication settings. See Ubuntu’s users and groups guide.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Add replication only when the availability design calls for it
Ubuntu describes syncrepl as a provider/consumer synchronization engine. It requires TLS to be enabled first, along with a replication identity that has appropriate access and search limits. Replication is not a substitute for backups, and by itself it does not establish a complete high-availability design.
| Replication method | What is synchronized | Trade-off |
|---|---|---|
| Standard replication | Changed entries are sent in their entirety. | Simpler than delta replication to set up, according to Ubuntu’s guide. |
| Delta replication | The change is sent. | More complex to set up, according to Ubuntu’s guide. |
Plan identity permissions and search limits deliberately, then follow the Ubuntu OpenLDAP replication guide for configuration details.
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Back up configuration and directory data, then prove restore works
A recoverable deployment needs both the cn=config configuration database and the directory data DIT. Ubuntu’s example exports them with slapcat and imports them with slapadd. An export is not proof that recovery will work: perform a restore drill and verify the restored service and representative entries.
LDIF exports include usernames and every password. Protect them with restrictive permissions, encryption, and off-site storage. Define an export schedule and storage location that meet your recovery needs, and record the restore procedure alongside the backups. See Backup and restore OpenLDAP.
Quick Recap
Deployment checklist
- The suffix and administrator DN are recorded and match the intended namespace.
- Entries have been added and checked with targeted searches; UID and GID values do not conflict with relevant local accounts.
- ACL behavior has been checked for anonymous, user, application, and administrative access.
- TLS is configured, and clients validate both CA trust and the server name before simple binds are used.
- Each intended client or application has been configured and tested separately.
- Configuration and data are backed up, protected, and recoverable in a tested restore procedure.
- If replication is used, its identity, access, search limits, and TLS requirements are configured; backups remain in place.
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