Question:
I created an RDS Proxy with existing Aurora PostgreSQL cluster.
But I want to pair the proxy with specific read replica instance of the cluster. Is that possible?
Answer:
From what AWS claims about RDS proxy:
The same consideration applies for RDS DB instances in replication configurations. You can associate a proxy only with the writer DB instance, not a read replica.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/rds-proxy.html