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Chapter 18. Monitoring the replication topology using the command line

To monitor the state of the directory data replication between suppliers, consumers, and hubs, you can use replication topology report that provides information on the replication progress, replica IDs, number of changes, and other parameters. To generate the report faster and make it more readable, you can configure your own credentials and aliases.

18.1. Displaying a replication topology report using the command line
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To view overall information about the replication status for each agreement in your replication topology, you can display the replication topology report. To do so, use the dsconf replication monitor command.

Prerequisites

  • The host is a member of replication topology.
  • You initialized the consumers.

Procedure

  • To view a replication topology report, enter: 

    # dsconf -D "cn=Directory Manager" ldap://supplier.example.com replication monitor
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    The dsconf utility will request authentication credentials for each instance in the topology: 

    Enter password for cn=Directory Manager on ldap://supplier.example.com: password
Enter a bind DN for consumer.example.com:389: cn=Directory Manager
Enter a password for cn=Directory Manager on consumer.example.com:389: password

Supplier: server.example.com:389
--------------------------------
Replica Root: dc=example,dc=com
Replica ID: 1
Replica Status: Online
Max CSN: 5e3acb77001d00010000

Status For Agreement: "example-agreement" (consumer.example.com:1389)
Replica Enabled: on
Update In Progress: FALSE
Last Update Start: 20211209122116Z
Last Update End: 20211209122116Z
Number Of Changes Sent: 1:21/0
Number Of Changes Skipped: None
Last Update Status: Error (0) Replica acquired successfully: Incremental update succeeded
Last Init Start: 20211209122111Z
Last Init End: 20211209122114Z
Last Init Status: Error (0) Total update succeeded
Reap Active: 0
Replication Status: In Synchronization
Replication Lag Time: 00:00:00

Supplier: consumer.example.com:1389
-----------------------------------
Replica Root: dc=example,dc=com
Replica ID: 65535
Replica Status: Online
Max CSN: 00000000000000000000
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By default, the dsconf replication monitor command asks for bind DNs and passwords when authenticating to remote instances. To generate the report faster and easier in the future, you can set the bind DNs, and optionally passwords, for each server in the topology in the user’s ~/.dsrc file.

Prerequisites

  • The host is a member of replication topology.
  • You initialized the consumers.

Procedure

  1. Optional: Create the ~/.dsrc file.

  2. In the ~/.dsrc file, set the bind DNs, and passwords. For example: 

    [repl-monitor-connections]
connection1 = server1.example.com:389:cn=Directory Manager:*
connection2 = server2.example.com:389:cn=Directory Manager:[~/pwd.txt]
connection3 = hub1.example.com:389:cn=Directory Manager:S3cret
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    This example uses connection1 to connection3 as keys for each entry. However, you can use any unique key.

    When you run the dsconf replication monitor command, the dsconf utility connects to all servers configured in replication agreements of the instance. If the utility finds the hostname in ~/.dsrc, it uses the defined credentials to authenticate to the remote server. In the example above, dsconf uses the following credentials when connecting to a server:

    Expand
    HostnameBind DNPassword setup method

    server1.example.com

    cn=Directory Manager

    Requests the password

    server2.example.com

    cn=Directory Manager

    Reads the password from ~/pwd.txt

    hub1.example.com

    cn=Directory Manager

    S3cret

Verification

18.3. Using aliases in the replication topology monitoring output
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To make the report more readable, you can set your own aliases that will be displayed in the report output. By default, the replication monitoring report contains the hostnames of remote servers.

Prerequisites

  • The host is a member of replication topology.
  • You initialized the consumers.

Procedure

If you want to see aliases in the report, use one of the following methods:

  • Define the aliases in the ~/.dsrc file: 

    [repl-monitor-aliases]
M1 = server1.example.com:389
M2 = server2.example.com:389
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  • Define the aliases by passing the -a alias=host_name:port parameter to the dsconf replication monitor command: 

    # dsconf -D "cn=Directory Manager" ldap://server.example.com replication monitor -a M1=server1.example.com:389 M2=server2.example.com:389
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In both cases, the dsconf replication monitor command displays the alias in the output: 

...
Supplier: M1 (server1.example.com:389)
--------------------------------
Replica Root: dc=example,dc=com

...
Supplier: M2 (server2.example.com:389)
--------------------------------
Replica Root: dc=example,dc=com
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