如何在 AWS CDK 中引用其他区域的资源？

Question

I have some cases need to reference resources from other region or account when using CDK. Some cases like:

ec2.SecurityGroup.fromSecurityGroupId(
ec2.Subnet.fromSubnetId(
...

I above static API, none of them provide a region / account property. How can I reference the construct from other regions via CDK?

Answer 1

By utilizing the fromArn functions where they are available.

For example, you can reference a cross-region Log Group using LogGroup.fromLogGroupArn() . If a method like this is not available for the resouce you want to reference, then it's not possible to reference it in CDK.

You could still achieve this by writing a Custom Resource, which is backed by a Lambda function executing arbitrary code and returning arbitrary values - you can use AWS SDK to do the lookup in the required region and return the result or perform operations on the resource.