nstack

Nested Cloudformation Stack

Nested stacks are stacks created as part of other stacks. You create a nested stack within another stack by using the AWS::CloudFormation::Stack resource. Nested stacks can themselves contain other nested stacks, resulting in a hierarchy of stacks

Stack A is the root stack for all the other, nested, stacks in the hierarchy.
For stack B, stack A is both the parent stack, as well as the root stack.
For stack D, stack C is the parent stack; while for stack C, stack B is the parent stack.

Steps:

First lets start by creating a nested stack which will create a single resource: S3 bucket.Then will upload the template to a S3 bucket and copy the Url to be used in the root stack.
Next I will create a root stack which will have this nested stack as one of the resource and provide the nested stack’s s3 url as a template URL.
Then I will just launch the root stack and the nested stack should be created automatically.

Creating Nested Stack:

Here is the Yaml template for a Single S3 bucket:

In Resources field a single S3 bucket is created with type: AWS::S3::Bucket
In Outputs field the bucketname of the S3 bucket is referred

Uploading to S3:

Created an empty bucket to upload the template to.

Then upload the nested stack yaml here

Make sure that you have permission on the object

Once uploaded, Copy the url of the template

Creating the master stack:

Here

We are giving a parameter for the s3 template url of the nested stack
Then in the resources field we are declaring the stack with name Bucketstack and type: AWS::CloudFormation::Stack
And in the properties we provide the TemplateUrl of the nested stack yml file