Replication of AWS RDS Postgresql into On-Premise Postgresql

Question

I have a requirement of replicate data from AWS RDS Postgres(9.6) Database to On-Premise Postgres(9.5) Database. I have found stuff about replication from On-premise to On-premise. But How can we implement it for AWS RDS to On-premise?

Answer 1

http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_PostgreSQL.html#PostgreSQL.Concepts.General.FeatureSupport.LogicalReplication

Beginning with PostgreSQL version 9.4, PostgreSQL supports the streaming of WAL changes using logical replication slots. Amazon RDS supports logical replication for a PostgreSQL DB instance version 9.4.9 and higher and 9.5.4 and higher. Using logical replication, you can set up logical replication slots on your instance and stream database changes through these slots to a client like pg_recvlogical. Logical slots are created at the database level and support replication connections to a single database.

mind possible problems eg https://dba.stackexchange.com/questions/173267/aws-rds-postgres-logical-replication

Answer 2

I do this using Bucardo. Check-out this: https://bucardo.org/Bucardo/

With Bucardo you can replicate RDS postgres instance to a slave postgres present somewhere, only configuring slave, so without the needs to configure RDS stuff. Also you can do this with zero downtime.

Anyway I am not sure this will work using different versions of Postgresql. You should use same version if possible. I tested it with 9.4.x and it is working.

UPDATE

I can confirm that this is working also using different version of Postgres, for example I was able to replicate with these versions:

• AWS RDS postgresql 9.4.x
• On-premise postgresql 9.6.x