👀 Views: 1 💬 Answers: 1 📅 Created: 2025-06-05

aws cloudformation rds YAML

Could someone explain I'm stuck on something that should probably be simple. I'm relatively new to this, so bear with me... I'm trying to deploy an RDS PostgreSQL instance using AWS CloudFormation, but I'm working with an scenario when I try to specify a custom parameter group. The CloudFormation stack fails with the following behavior: `InvalidParameterValue: The parameter group specified is not valid for this DB engine version.` Here's the relevant part of my CloudFormation template: ```yaml Resources: MyDBParameterGroup: Type: AWS::RDS::DBParameterGroup Properties: Family: postgres12 Description: Custom parameter group for my application Parameters: work_mem: '65536' MyDatabase: Type: AWS::RDS::DBInstance Properties: AllocatedStorage: '20' DBInstanceClass: db.t3.micro DBInstanceIdentifier: mydbinstance Engine: postgres EngineVersion: '12.4' MasterUsername: admin MasterUserPassword: mypassword DBParameterGroupName: !Ref MyDBParameterGroup VPCSecurityGroups: - sg-12345678 MultiAZ: false StorageType: gp2 ``` I've double-checked that the engine version matches the family of the parameter group (postgres12), and I'm using the correct parameter for PostgreSQL 12. I also verified that the DBParameterGroup is created before the DBInstance, but I'm still getting this behavior each time I try to deploy the stack. To troubleshoot, I tried creating the parameter group manually through the AWS Console and associating it with a new RDS instance, and that worked fine. Is there something I'm missing in my CloudFormation template that could cause this behavior? Any insights would be appreciated! I'm working on a application that needs to handle this. What am I doing wrong? What am I doing wrong?