OpenLDAP is a powerful open-source implementation of the Lightweight Directory Access Protocol (LDAP). It is used for managing user authentication and directory services. In this guide, we will walk through the steps to add a Rocky Linux system to an OpenLDAP server.

Step 1: Install Required Packages

First, ensure that your system is up-to-date and install the necessary packages for OpenLDAP:

sudo dnf update
sudo dnf install openldap openldap-clients nss-pam-ldapd

Step 2: Configure LDAP Client

Next, configure the LDAP client to connect to your OpenLDAP server. Open the LDAP configuration file:

sudo nano /etc/nslcd.conf

Add the following lines to configure the LDAP server details:

uri ldap://your_ldap_server_ip
base dc=example,dc=com

Step 3: Update the nsswitch.conf File

Modify the nsswitch.conf file to enable LDAP for user and group lookups:

sudo nano /etc/nsswitch.conf

Find the following lines and update them:

passwd:     files ldap
group:      files ldap

Step 4: Start and Enable the nslcd Service

After configuring the LDAP client, start the nslcd service and enable it to start at boot:

sudo systemctl start nslcd
sudo systemctl enable nslcd

Step 5: Test the LDAP Connection

To verify that your Rocky Linux system can connect to the OpenLDAP server, use the following command:

getent passwd

This command should return a list of users, including those stored in the OpenLDAP server.

Step 6: Configure PAM for LDAP Authentication

To enable PAM (Pluggable Authentication Modules) for LDAP authentication, open the pam_ldap.conf file:

sudo nano /etc/pam_ldap.conf

Make sure the following settings are present:

uri ldap://your_ldap_server_ip
base dc=example,dc=com
binddn cn=admin,dc=example,dc=com
bindpw your_admin_password

Step 7: Restart Services

After configuring PAM, restart the necessary services to apply the changes:

sudo systemctl restart nslcd

Conclusion

You have successfully added your Rocky Linux system to an OpenLDAP server. This setup allows for centralized authentication and user management across your network.

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