Chapter 4. Configuring multi-supplier replication using the web console
In a multi-supplier replication environment, two or more writable suppliers replicate data with each other. For example, set up multi-supplier replication to provide a fail-over environment and distribute the load over multiple servers. Clients can then perform read and write operations on any host that is a read-write replica.
This section assumes that you have an existing Directory Server instance running on a host named supplier1.example.com
. The procedures describe how to add another read-write replica named supplier2.example.com
to the topology, and how to configure multi-supplier replication for the dc=example,dc=com
suffix.
4.1. Preparing the new supplier using the web console
To prepare the supplier2.example.com
host, enable replication. This process:
- 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
- You installed the Directory Server instance.
-
The database for the
dc=example,dc=com
suffix exists. - You are logged in to the instance in the web console.
Procedure
-
Open the
Replication
menu. -
Select the
dc=example,dc=com
suffix. Enable replication:
- Click Enable Replication.
Select
Supplier
in theReplication Role
field, enter a replica ID, as well as the distinguished name (DN) and password of the replication manager account to create:These settings configure the host as a supplier for the
dc=example,dc=com
suffix and set the replica ID of this entry to1
.ImportantThe replica ID must be a unique integer between
1
and65534
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.
- Click Enable Replication.
Verification
-
Open the
Replication
menu. -
Select the
dc=example,dc=com
suffix. -
If the
Replica Role
field contains the valueSupplier
, replication is enabled, and the host is configured as a supplier.
Additional resources
4.2. Configuring the existing server as a supplier to the new server using the web console
To prepare the existing server supplier1.example.com
as a supplier, you need to:
- Enable replication for the suffix.
- Create a replication agreement 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
-
Open the
Replication
menu. -
Select the
dc=example,dc=com
suffix. Enable replication:
- Click Enable Replication.
Select
Supplier
in theReplication Role
field, enter a replica ID, as well as the distinguished name (DN) and password of the replication manager account to create:These settings configure the host as a supplier for the
dc=example,dc=com
suffix and set the replica ID of this entry to2
.ImportantThe replica ID must be a unique integer between
1
and65534
for a suffix across all suppliers in the topology.- Click Enable Replication.
Add a replication agreement and initialize the new server:
On the
Agreements
tab, click Create Agreement, and fill the fields: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.-
Select
Do Online Initialization
in theConsumer Initialization
field to automatically initialize the new server after saving the agreement. 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
-
Open the
Replication
menu. -
Select the
dc=example,dc=com
suffix. On the
Agreements
tab, verify the status of the agreement in theState
column of the table.
4.3. Configuring the new server as a supplier to the existing server using the web console
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.
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
-
Open the
Replication
menu. -
Select the
dc=example,dc=com
suffix. Add a replication agreement and initialize the existing server:
On the
Agreements
tab, click Create Agreement, and fill the fields: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.-
Select
Do Online Initialization
in theConsumer Initialization
field to automatically initialize the new server after saving the agreement. 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
-
Open the
Replication
menu. -
Select the
dc=example,dc=com
suffix. On the
Agreements
tab, verify the status of the agreement in theState
column of the table.