AWS Config rule, configRule.inputParamters more than 1024

From your query, I understand while creating the AWS Managed Config rule 'required-tags', you are getting error as 'at 'configRule.inputParameters' failed to satisfy constraint: Member must have length less than or equal to 1024.

As mentioned in the document [1], currently the length Constraints for InputParameters is 1024. The 1024 characters limit is currently a hard limit.

Given the current "InputParameters" max character limit, a workaround I can think of is to create multiple Config Rules based on "required-tag", and split the tag-key/pairs in different Rules to get coverage. Resources that are non_compliant in all the "required-tag" Config Rules would be indeed non_compliant to all the tag-key/pairs.

Another workaround, is to use a custom Config Rule [2] instead of using the managed Config Rule. The custom Config Rule is backed by a Lambda function, and the Lambda function can pull the list of tag-key/pairs from another location such as an S3 bucket object and evaluate the resources against the list. We do have some custom Config Rule code samples as a template available on the GitHub repository [3], and a similar Rule code for this use case would be this one [4].

Reference : [1] https://docs.aws.amazon.com/config/latest/APIReference/API_ConfigRule.html#config-Type-ConfigRule-InputParameters [2] https://docs.aws.amazon.com/config/latest/developerguide/evaluate-config_develop-rules.html [3] https://github.com/awslabs/aws-config-rules/tree/master/python [4] https://github.com/awslabs/aws-config-rules/blob/master/python/ec2_require_tags_with_valid_values.py