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If you’re seeing a replication error after switching your database environment from blue to green, don’t worry—this is normal and nothing to be concerned about. When you successfully switch over from your old environment (blue) to the new one (green), the replication between these two environments stops by design.
Here’s what happens during a blue/green deployment switch: the green environment becomes your live, production system, while the blue environment, which was your previous setup, turns into an inactive or backup environment. The database instances in the old blue environment stay in place but are no longer actively replicating data. Amazon RDS changes their names and sets them to read-only mode for safety.
The error message you see about replication is simply indicating that the link between the old and new environments has been broken—that’s exactly what should happen after a successful switch. If you’ve checked your database and it’s running smoothly without errors in the logs, then this replication error is just a leftover message and doesn’t mean there’s an actual problem.
The old blue instances are kept accessible so you can review or restore data if needed. However, they no longer participate in data replication with the current production environment. Once you’re confident you won’t need to revert or look back at the old setup, you can delete these old instances to free up resources.
For more details, you can refer to Amazon’s official guide on how to manage blue/green deployments in RDS.
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