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Chapter 4. Configuring multi-supplier replication using the web console

Configure multi-supplier replication in Directory Server to ensure high availability for directory updates. The topology where two or more suppliers (read-write replicas) accept write operations from each other prevents a single point of failure and ensures continuous service availability.

Later the client applications can perform read and write operations on any supplier host.

Provided example procedures assume that you have an existing Directory Server instance running on a host supplier1.example.com. Add a second read-write replica named supplier2.example.com to the topology, and then configure multi-supplier replication for the dc=example,dc=com suffix.

4.1. Preparing the new supplier using the web console
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Prepare a new Directory Server instance to function as a replication supplier to propagate updates to consumers and hubs, ensuring data consistency and high availability across your environment.

To prepare the supplier2.example.com host, enable replication. The process achieves the following:

  • Configures the role of this server in the replication topology
  • Defines the suffix that is replicated
  • Creates the replication manager account the supplier uses to connect to this host

Perform this procedure on the supplier that you want to add to the replication topology.

Prerequisites

Procedure

  1. Open the Replication menu.
  2. Select the dc=example,dc=com suffix.

  3. Enable replication:

    1. Click Enable Replication.

    2. Select Supplier in the Replication Role field, enter a replica ID, as well as the distinguished name (DN) and password of the replication manager account to create:

      Preparing the new supplier

      These settings configure the host as a supplier for the dc=example,dc=com suffix and set the replica ID of this entry to 1.

      Important

      The replica ID must be a unique integer between 1 and 65534 for a suffix across all suppliers in the topology.

      If you set no replication manager DN, set a bind group DN. You can then use any member of this group in the replication agreement.

    3. Click Enable Replication.

Verification

  1. Open the Replication menu.
  2. Select the dc=example,dc=com suffix.
  3. If the Replica Role field contains the value Supplier, replication is enabled, and the host is configured as a supplier.

Configure an existing Directory Server instance as a supplier to a newly installed server in a multi-supplier replication topology. Define the supplier settings using the web console to send directory updates to the new instance.

To prepare the existing server supplier1.example.com as a supplier, you need to do the following:

  • Enable replication for the suffix.
  • Create a replication agreement that points to the new supplier.
  • Initialize the new supplier.

Perform this procedure on the existing supplier in the replication topology.

Prerequisites

  • You enabled replication for the dc=example,dc=com suffix on the supplier to join.
  • You are logged in to the instance in the web console.

Procedure

  1. Open the Replication menu.
  2. Select the dc=example,dc=com suffix.

  3. Enable replication:

    1. Click Enable Replication.

    2. Select Supplier in the Replication Role field, enter a replica ID, as well as the distinguished name (DN) and password of the replication manager account to create:

      Configuring the existing server as a supplier to the new server

      These settings configure the host as a supplier for the dc=example,dc=com suffix and set the replica ID of this entry to 2.

      Important

      The replica ID must be a unique integer between 1 and 65534 for a suffix across all suppliers in the topology.

    3. Click Enable Replication.

  4. Add a replication agreement and initialize the new server:

    1. On the Agreements tab, click Create Agreement, and fill the fields:

      Creating a replication agreement on a supplier

      These settings create a replication agreement named example-agreement-supplier1-to-supplier2. The replication agreement defines settings, such as the new supplier’s host name, protocol, and authentication information that the supplier uses when connecting and replicating data to the new supplier.

    2. Select Do Online Initialization in the Consumer Initialization field to automatically initialize the new server after saving the agreement.

    3. Click Save Agreement.

      After the agreement was created, Directory Server initializes supplier2.example.com. Depending on the amount of data to replicate, initialization can be time-consuming.

Verification

  1. Open the Replication menu.
  2. Select the dc=example,dc=com suffix.

  3. On the Agreements tab, verify the status of the agreement in the State column of the table.

    Replication agreement successful initialization

Configure the new Directory Server instance as a supplier to the existing server to enable data replication in a multi-supplier replication topology.

To prepare the new server supplier2.example.com as a supplier, you need to:

  • Enable replication for the suffix.
  • Create a replication agreement to the existing server.
  • Initialize the existing server.

Perform this procedure on the existing supplier in the replication topology.

Warning

Do not continue if you have not initialized the replication agreement on the existing server. Otherwise, the empty database from the new server overrides the database on the existing supplier.

Prerequisites

  • You enabled replication for the dc=example,dc=com suffix on the new server.
  • You enabled replication for the dc=example,dc=com suffix on the existing server.
  • The new server to join is successfully initialized.
  • You are logged in to the instance in the web console.

Procedure

  1. Open the Replication menu.
  2. Select the dc=example,dc=com suffix.

  3. Add a replication agreement and initialize the existing server:

    1. On the Agreements tab, click Create Agreement, and fill the fields:

      Creating a replication agreement on a supplier

      These settings create a replication agreement named example-agreement-supplier2-to-supplier1. The replication agreement defines settings, such as the existing server’s host name, protocol, and authentication information that the supplier uses when connecting and replicating data to the existing supplier.

    2. Select Do Online Initialization in the Consumer Initialization field to automatically initialize the new server after saving the agreement.

    3. Click Save Agreement.

      After the agreement was created, Directory Server initializes supplier1.example.com. Depending on the amount of data to replicate, initialization can be time-consuming.

Verification

  1. Open the Replication menu.
  2. Select the dc=example,dc=com suffix.

  3. On the Agreements tab, verify the status of the agreement in the State column of the table.

    Replication agreement successful initialization
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