WebAdmin facilitates the joining of an old master of the cluster as a standby node.

1. In the [Instances] tab, select the remote instance (from where the new cluster node will stream WAL entries), and then click .

2. Configure the node to accept streaming requests from the new node.

3. In the [Instances] tab, select the new standby instance (which needs to be connected to the cluster), and then click .

4. Set [Replication host name] to the remote instance.

5. Enter [Replication credential].

   Specify the user name and password required for the standby instance to connect to the remote instance. The user name and password can be entered or selected from the Wallet. Refer to "Appendix J WebAdmin Wallet" for information on creating wallet entries. Replication credential (user name and password) should not contain hazardous characters. Refer to “Appendix K WebAdmin Disallow User Inputs Containing Hazardous Characters”.

6. Enter [Host IP address].

   Specify the IP address of the node where the standby instance was created.

7. Click to open the [Join replication cluster] dialog box.

   For Fujitsu Enterprise Postgres 13 and earlier instances, select [Restart later] or [Restart now], and then click [Yes] to set up the standby instance.
   For Fujitsu Enterprise Postgres 14 or later, click [Yes] to set up the standby instance.

8. Upon successful completion, the confirmation dialog box will be displayed.

9. Click [Close] to return to the instance details window.

The instance will become a standby instance, and will be part of the streaming replication cluster. The replication diagram will display the relationship between the standby instance and the remote instance. The user can change the replication relationship of the remote instance from asynchronous to synchronous (and vice versa) using the [Configuration] window.