AWS Cloudformation - reverse engineer an existing resource

Question

Initially a while back created a cloudformation template to create multiple services on a given cluster, setup a aurora rds, redis and a load balancer.

The template was broken so i had to do various manual changes to get it working:

• redis was created on the default vpc so had to manually do vpc - vpc peering
• added https port forwarding on my alb
• cors and various arn inline roles for the s3 bucket
• and potentially dozen or so other changes

In the process of rewriting the cloudformation stack so my question is:

1. Is there a way using the aws cli to reverse engineer my current alb, rds, s3 to get a cloud formation formation template for each them?.

• so then i would be able to compare the cloud formation template with the new own and adjust it.

2. Or is there a way to compare the current cloudformation stack with the current state of the resources and reverse engineer it that way.

Answer 1

Seems as former2 would be the best solution to your use-case:

Generate CloudFormation / Terraform / Troposphere templates from your existing AWS resources