Reference cross-instance StackSet outputs

Question

Let's assume two StackSets, "BucketStack" and "LambdaStack". 
* BucketStack get's deployed to account A, region us-west-1, we have now instance Bucket1 with output bucketArn
* LambdaStack get's deployed to account A, region us-west-1, we have now instance Lambda1
* Withing Lambda1 I want to access bucketArn in instance Bucket1

Is there any way to achieve that? Best case would be a direct CDK way.

Accepted Answer

Hi Jonas,

Yes, you can export the output from one stack and import its value into another stack in Cloudformation and CDK.

Since you are using CDK, you can export a resource's output by creating a `cfnOutput` with an `exportName` property. \
You can then use `Fn.ImportValue` to import the exported value to another stack.

I think this blog [1] outlines exactly the use case that you are looking for.

Also, please make a note of the following, in case you plan to have multiple stack instances exporting the output with the same export name `bucketArn` [2]:
> For each AWS account, Export names must be unique within a region.

References: \
[1] https://bobbyhadz.com/blog/import-value-aws-cdk-cross-stack \
[2] https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/walkthrough-crossstackref.html

Regards, \
Atul

Reference cross-instance StackSet outputs

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