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Enable Logical Replication

Crunchy Bridge comes with logical replication enabled by default. Ensure that the settings below are configured correctly. If not, adjust them accordingly.

SHOW wal_level; -- should be logical
SHOW max_wal_senders; -- should be 10
SHOW max_replication_slots; -- should be 10

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Creating PeerDB User and Granting permissions

Connect to your Crunchy Bridge Postgres through the postgres user and run the below commands:

1. Create a Postgres user exclusively for PeerDB.

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         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.

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         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:

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        ALTER ROLE peerdb_user REPLICATION;
      

4. Create publication that you’ll be using for creating the MIRROR (replication) in future.

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         CREATE PUBLICATION peerdb_publication FOR ALL TABLES;
      

ALTER USER peerdb_user BYPASSRLS;

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Safe list PeerDB Cloud IPs

If you are using PeerDB Cloud safelist the public IPs of your PeerDB Cloud instance by adding the Firewall Rules in Crunchy Bridge.

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Create Crunchy Bridge Peer in PeerDB

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