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Cloud Config:Inconsistent CPU and memory configurations between primary and secondary nodes in an RDS cluster

Last Updated:Oct 20, 2025

For an RDS cluster to be compliant, its primary and secondary nodes must have the same instance size.

Risk level

Default risk level: Medium.

You can change the risk level as needed.

Detection logic

  • For an RDS cluster to be compliant, its primary and secondary nodes must have the same instance size.

Rule details

Parameter

Description

Rule name

Primary and secondary nodes in an RDS cluster have inconsistent CPU and memory configurations

Rule identifier

rds-instance-secondary-node-size-check

Tags

RDS,Instance

Automatic remediation

Not supported

Rule trigger

Configuration change

Supported resource types

ACS::RDS::DBInstance

Input parameters

None

Remediation

To resolve this issue on a non-compliant resource, see Manage primary/secondary failover.