(rds): add auto_minor_version_upgrade to DatabaseCluster constructor

[rittneje]

Describe the feature

CloudFormation AWS::RDS::DBCluster has an AutoMinorVersionUpgrade field. But this field is not mapped into aws_rds.DatabaseCluster so we cannot set it. Please add it.

Use Case

Auto-minor version upgrades are a problem when the stack itself is specifying the minor version. (See #15475.) We want to be able to disable it so we can properly control the version.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

CDK version used

2.28.0 (build ba233f0)

Environment details (OS name and version, etc.)

Alpine 3.16, Python 3.10.5

[peterwoodworth]

Thanks for submitting this, we accept contributions! Check out our contributing guide if you're interested - there's a low chance the team will be able to address this soon but we'd be happy to review a PR 🙂

[sreenath-tm]

I'm interested in contributing to this issue, so before I start working it, would you mind sparing your time explaining what the fix will be like and pointing me to some resources to get started.

[daschaa]

@rittneje I don't see this field in the CloudFormation resource. See here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-rds-dbcluster.html

Could you please specify from which documentation you took the information that the DBCluster resource has the field AutoMinorVersionUpgrade.

[peterwoodworth]

@daschaa I assume OP was referring to DBInstance

[rittneje]

@daschaa In the console I can create a cluster with auto-minor version upgrades disabled. I don't know if this maps to an per-instance property or not. So there may also be a CloudFormation issue where that property is not exposed at the cluster level.

[rgoltz]

As far I as known, AWS::RDS::DBCluster creates an Aurora database only. On the other hand via AWS::RDS::DBInstance you could create SQLServer, PostgreSQL, Oracle, etc (but no Aurora database). The option to disable auto_minor_version_upgrade in terms of AWS::RDS::DBInstance would also help to avoid Stack Drifts on CloudFormation stack-level, as reported via https://github.com/aws-cloudformation/cloudformation-coverage-roadmap/issues/1309

Since auto_minor_version_upgrade is enabled by default (even not set via CloudFormation template output) the exact version of your database would differ quite fast compaired to your IaC/CDK defintion. Having this said, I agree with @rittneje that a easy way to disable it in order to properly control the version of your QLServer, PostgreSQL, Oracle, etc database.

[daschaa]

@peterwoodworth For the instance level you can pass the autoMinorVersionUpgrade via the instanceProps when instantiating the Cluster if I understand it correctly? Is this maybe the thing which is done via the AWS Console?

const cluster = new rds.DatabaseCluster(stack, 'Database', {
  engine: rds.DatabaseClusterEngine.AURORA,
  instanceProps: {
    ...otherInstanceProps,
    autoMinorVersionUpgrade: false,
  },
});

[rittneje]

@rgoltz Aurora also uses AWS::RDS::DBInstance to define the individual instances. The DBClusterIdentifier ties these back to the cluster.

[rgoltz]

@rgoltz Aurora also uses AWS::RDS::DBInstance to define the individual instances. The DBClusterIdentifier ties these back to the cluster.

Thanks for clarification and correction.

[s0enke]

Current workaround:

        // disable auto minor version upgrade for all instances
        for (let i = 0; i < instanceCount; i++) {
            const cfnDbInstance = dbCluster.node.findChild(`Instance${i + 1}`) as aws_rds.CfnDBInstance;
            cfnDbInstance.autoMinorVersionUpgrade = false;
        }