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rds_postgres.mdx

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RDS Postgres Source Setup Guide

import SSHTunnel from '/snippets/ssh-tunnel.mdx';

Supported Postgres versions

Anything on or after Postgres 12

Enable Logical Replication

You don't need to follow the below steps if the settings rds.logical_replication is 1 and wal_sender_timeout is 0. These settings should mostly be pre-configured if you are migrating from another data replication tool.

  1. Create a new parameter group for your Postgres version with rds.logical_replication set to 1; and wal_sender_timeout set to 0.

  2. Modify the RDS Postgres database by adding the new parameter group.

  3. Reboot your RDS Postgres database for the above parameters to kick in.

Creating PeerDB User and Granting permissions

Connect to your RDS postgres through the admin user and run the below commands:

  1. Create a Postgres user exclusively for PeerDB.

    1.    CREATE USER peerdb_user PASSWORD 'some-password';

  2. Grant read-only access to the schema from which you are replicating tables to peerdb-user. Below example shows granting permissions for the public schema. If you want to grant access to multiple schemas, you can run these three commands for each schema.

    1.    GRANT USAGE ON SCHEMA "public" TO peerdb_user;
   GRANT SELECT ON ALL TABLES IN SCHEMA "public" TO peerdb_user;
   ALTER DEFAULT PRIVILEGES IN SCHEMA "public" GRANT SELECT ON TABLES TO peerdb_user;

  3. Grant replication access to this user:

    1.    GRANT rds_replication TO peerdb_user ;

  4. Create a publication that you'll be using for creating the MIRROR (replication) in future. It's recommended to create a publication for only the tables that you want to replicate, like below:

    1.    CREATE PUBLICATION peerdb_publication FOR TABLE table1, table2, table3....;

Safe list PeerDB Cloud IPs

If you are using PeerDB Cloud safelist public IPs of your PeerDB Cloud instance by editing the Inbound rules of the Security group in which your RDS Postgres is located.

Create RDS Postgres Peer in PeerDB

Through the PeerDB UI, create the RDS Postgres Peer using the peerdb_user that you created in the previous step.