Red Hat DIRECTORY SERVER 8.0, Руководство администратора

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Chapter 8. Managing Replication
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The replication monitoring attributes are described in more detail in the
Directory Server
Configuration, Command, and File Reference
.
To keep data integrity, initialize the consumer databases from the appropriate supplier. Depending on
the replication scenario, this can be more difficult in mixed replication environments, but, even when
manually initializing consumers, consider four things:
• Use one supplier, a
data master
, as the source for initializing consumers.
• Do not
reinitialize
a data master when the replication agreements are created. For example, do not
initialize server1 from server2 if server2 has already been initialized from server1.
• For a multi-master scenario, initialize all of the other master servers in the configuration from one
master.
• For cascading replication, initialize all of the hubs from a supplier, then initialize the consumers from
the hubs.
8.8. Making a Replica Updatable
Making a read-only server writable means changing the replica from a dedicated consumer or a hub to
a supplier.
1. Make sure there are no updates in progress.
2. Stop the supplier server.
3. Open the Directory Server Console for the read-only replica.
4. In the
Configuration
tab, select
Replication
. In the right pane, select the
Enable changelog
checkbox.
5. Select the suffix, and, in the
Replica Settings
tab, change the replica role to a single master or
multi-master, and assign a unique replica ID.
6. Save the changes, and restart the server.
8.9. Deleting the Changelog
The changelog is a record of all modifications on a given replica that the supplier uses to replay these
modifications to replicas on consumer servers (or suppliers in the case of multi-master replication). If
a supplier server goes offline, it is important to be able to delete the changelog because it no longer
holds a true record of all modifications and, as a result, should not be used as a basis for replication.
After deleting the changelog, reinitialize the consumers and begin the replication process afresh. To
delete the changelog, either remove it or move it to a new location.
•
Section 8.9.1, “Removing the Changelog”
•
Section 8.9.2, “Moving the Changelog to a New Location”
8.9.1. Removing the Changelog
To remove the changelog from the supplier server, do the following: