Feature request - Nested stacks creation about stack_master

[stevehodgkiss]

Hi @lethalpaga

It sounds like there are two parts to this

• allowing CF updates via S3
• nested stack support

We don't have any immediate plans to implement either, but we've discussed CF updates through S3 before. We don't use nested stacks and instead connect stacks together with stack outputs/parameter resolvers.

All nested templates would have to be declared alongside the main template, maybe as a file parameter (that would allow one to upload any kind of file to that bucket, if used by a UserData script or such) and uploaded to that bucket

That sounds reasonable. Just thinking out load: I wonder if we could use parameter resolvers for this. For example:

nested_stack_url:
  nested_stack: template-name.rb

The resolver would automatically compile and upload the template and provide an S3 url. I'm not sure how diffing would work on nested stacks though.

Happy for you to have a go implementing this. Thanks!

[luckymike]

The SparkleFormation nest!() method will generate a nested stack resource (which includes a path to the template in the S3 Bucket). You would need to support configuring the bucket(s) to use (and providing these to SparkleFormation at compilation) and uploading templates to the bucket.

This is implemented in sfn if you'd like to see it in action to understand how the parts work.

[patrobinson]

We support S3 uploads now, I'm unsure if nested stacks are supported though. Feel free to open a new issue if there are any issues.