Conditions for Private IP Address Changes in Amazon RDS

Question

What are the conditions that cause private IP address changes in Amazon RDS?

The following site explains the conditions under which RDS IP addresses can change:
https://repost.aws/knowledge-center/rds-ip-address-issues
When testing several scenarios with Aurora PostgreSQL:

* Stopping and restarting an instance did not change its private IP
* Failover between primary and secondary instances only switched their roles while maintaining their original IP addresses

While Aurora doesn't allow manual private IP assignment during instance creation, the automatically assigned IPs appear to remain constant throughout the instance lifecycle.
This observation raises the question: Are Aurora's private IP addresses actually immutable once assigned?

Didier_Durand · Answer

Hi.

Section "The IP addresses of my DB instances aren't consistent" of https://repost.aws/knowledge-center/rds-ip-address-issues list all possible situations when IP addresses of an RDS instance can change

Best,

Didier

Conditions for Private IP Address Changes in Amazon RDS

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