resource/aws_rds_cluster/aws_rds_cluster_instance: Remove default value from engine parameter

[gdavison]

Description

The resource aws_rds_cluster defines a default value of aurora for the engine parameter. The AWS API treats this parameter as required and does not define a default. Additionally, aurora creates a MySQL-5.6-compatible cluster, while aurora-mysql is used for MySQL-5.7- and MySQL-8.0-compatible clusters.

• aws_rds_cluster: Remove the default value and make engine a required parameter.
• aws_rds_cluster_instance: Remove the default value and make engine a required parameter.

Affected Resource(s) and/or Data Source(s)

aws_rds_cluster

Potential Terraform Configuration

No response

References

No response

Would you like to implement a fix?

No response

[github-actions]

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[jar-b]

With Aurora MySQL Version 1 now at EOL, it appears aurora (the current default value) has been removed as a valid value for the Engine argument in APIs like CreateDBCluster:

As part of these breaking changes, we should remove this constant to ensure plan time validation matches the AWS valid values going forward.

terraform-provider-aws/internal/service/rds/consts.go

Line 110 in 5f5949f

ClusterEngineAurora = "aurora"

Ref:

• https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.MySQL56.EOL.html
• https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_CreateDBCluster.html
• Relates Replace RDS Aurora Version 1 (MySQL 5.6) engine version in acceptance tests #30355

[jar-b]

Closed by #31112, merged to main via #31392

[github-actions]

This functionality has been released in v5.0.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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