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Configuring Master-Slave LDAP Replication on Ubuntu with Session Replication

Ubuntu 21

In this article, we will guide you through the process of configuring Master-Slave LDAP replication on Ubuntu with session replication. This is a crucial process for ensuring data consistency and high availability in your LDAP servers.

Quick Answer

Configuring Master-Slave LDAP replication on Ubuntu with session replication is a complex process that involves installing OpenLDAP, configuring the Master and Slave servers, enabling replication, and testing the setup. It is not possible to provide a quick answer for this topic as it requires detailed steps and explanations.

Introduction

LDAP, or Lightweight Directory Access Protocol, is a protocol used to access and maintain distributed directory information services over an Internet Protocol (IP) network. Replication is the process of sharing any level of information so as to ensure consistency between redundant hardware and software resources to improve reliability, fault-tolerance, and accessibility.

Prerequisites

Before we begin, ensure that you have the following:

  • Two Ubuntu servers: one for the Master LDAP server and the other for the Slave LDAP server.
  • Sudo or root privileges on both servers.

Step 1: Installing OpenLDAP

The first step in setting up Master-Slave LDAP replication is to install OpenLDAP on both servers. OpenLDAP is a free, open-source implementation of the LDAP.

To install OpenLDAP, run the following command on both servers:

sudo apt-get install slapd ldap-utils

The slapd package is the LDAP server, while ldap-utils is a package that includes several utilities for managing and interfacing with the LDAP server.

Step 2: Configuring the Master LDAP Server

After installing OpenLDAP, the next step is to configure the Master LDAP server. To do this, you need to edit the LDAP configuration file.

Run the following command to open the configuration file:

sudo nano /etc/ldap/ldap.conf

In this file, ensure that the following lines are present and uncommented:

URI ldap://localhost
BASE dc=acme,dc=com

The URI directive specifies the Uniform Resource Identifier of the LDAP server. The BASE directive specifies the base DN (Distinguished Name) for the server.

Step 3: Enabling Replication on the Master Server

Once the Master server is configured, the next step is to enable replication. This involves creating a replication user and enabling the provider service.

To create a replication user, you need to create an LDIF (LDAP Data Interchange Format) file and add it to the LDAP server. Use the following command:

sudo ldapadd -Y EXTERNAL -H ldapi:/// -f create_repl_user.ldif

The -Y EXTERNAL option specifies the SASL mechanism to use for authentication. The -H ldapi:/// option specifies the LDAP URI to connect to. The -f create_repl_user.ldif option specifies the LDIF file to use.

Next, enable the provider service by running the following command:

sudo ldapmodify -Y EXTERNAL -H ldapi:/// -f enable_sync_prov.ldif

Step 4: Configuring the Slave LDAP Server

After the Master server is set up, the next step is to configure the Slave LDAP server. This involves editing the LDAP configuration file, just like on the Master server.

Run the following command to open the configuration file:

sudo nano /etc/ldap/ldap.conf

In this file, ensure that the following lines are present and uncommented:

URI ldap://yourldapservername.com
BASE dc=acme,dc=com

The URI directive should point to the Master LDAP server.

Step 5: Enabling Replication on the Slave Server

Once the Slave server is configured, the next step is to enable replication. This involves adding the consumer sync settings to the LDAP server.

To do this, you need to create an LDIF file and add it to the LDAP server. Use the following command:

sudo ldapadd -Y EXTERNAL -H ldapi:/// -f enable_sync_consumer.ldif

Step 6: Testing Replication

After setting up replication, the final step is to test it. This involves making changes to the LDAP entries on the Master server and checking whether these changes are replicated on the Slave server.

For example, you could change a user’s password on the Master server and then check whether the new password is also set on the Slave server.

Conclusion

Setting up Master-Slave LDAP replication on Ubuntu with session replication can be a complex process, but it’s crucial for ensuring data consistency and high availability. By following the steps in this guide, you should now have a working Master-Slave LDAP replication setup.

Remember to test your setup thoroughly to ensure that replication is working correctly. If you encounter any issues, check your configuration files and LDIF files for any errors.

What is LDAP?

LDAP stands for Lightweight Directory Access Protocol. It is a protocol used to access and maintain distributed directory information services over an IP network.

Why is LDAP replication important?

LDAP replication is important for ensuring data consistency and high availability in LDAP servers. It allows for redundant hardware and software resources, improving reliability, fault-tolerance, and accessibility.

What is OpenLDAP?

OpenLDAP is a free, open-source implementation of the LDAP protocol. It is used to set up and manage LDAP servers.

How do I install OpenLDAP on Ubuntu?

You can install OpenLDAP on Ubuntu by running the command sudo apt-get install slapd ldap-utils.

How do I configure the Master LDAP server?

To configure the Master LDAP server, you need to edit the LDAP configuration file located at /etc/ldap/ldap.conf and specify the URI and base DN for the server.

How do I enable replication on the Master server?

Replication on the Master server involves creating a replication user and enabling the provider service. This can be done by using the ldapadd and ldapmodify commands with the appropriate LDIF files.

How do I configure the Slave LDAP server?

To configure the Slave LDAP server, you need to edit the LDAP configuration file located at /etc/ldap/ldap.conf and specify the URI of the Master LDAP server.

How do I enable replication on the Slave server?

Replication on the Slave server involves adding the consumer sync settings to the LDAP server. This can be done by using the ldapadd command with the appropriate LDIF file.

How do I test LDAP replication?

To test LDAP replication, you can make changes to LDAP entries on the Master server and check if these changes are replicated to the Slave server. For example, you can change a user’s password and verify if it is replicated correctly.

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