CloudFormation Macros: Transform Your Templates

The slides to accompany the workshop I gave at the Melbourne AWS Programming and Tools Meetup on July 10, 2019.

Actual workshop code can be found at https://github.com/ArjenSchwarz/workshop-cfn-macros

Last year AWS released CloudFormation Macros and, by doing so, gave us the ability to fully customise our CloudFormation templates. Macros run as Lambda functions that you write yourself and CloudFormation will allow these functions to change your templates in any way you want them to.
This can be anything you imagine; duplicating entries, ensuring naming standards, pulling information from S3, up to and including writing your own custom templates that create a complete environment. In this workshop we'll take a first step in this process by building one such Macro and laying the groundwork for you to create your own.

Transcript

1. CloudFormation Macros Transform your Templates Melbourne AWS Programming and Tools Meetup July 10, 2019 Arjen Schwarz
 Lead Platform Engineer @ DigIO
2. Hi • Lead Platform Engineer @ DigIO • APN Ambassador @ DigIO/CMD • Organise @ AWS User Group Melbourne • Write @ ig.nore.me 2
3. CloudFormation 3
4. Declarative 4
5. An ugly template 5
6. Downsides 6
7. Static 7
8. 8 AWSTemplateFormatVersion: "2010-09-09" Description: Lots of buckets Resources: Bucket1: Type: AWS::S3::Bucket Bucket2: Type: AWS::S3::Bucket Bucket3: Type: AWS::S3::Bucket Bucket4: Type: AWS::S3::Bucket
9. Terrible syntax 9
10. How to solve this? 10
11. Terraform 11
12. DSLs 12
13. CDK 13
14. Macros 14
15. Transforms (parts of) templates 15
16. Flow 16
17. It's all about the Lambdas 17
18. event 18
19. return values 19
20. Template 20
21. NaclExpander 21
24. 24 https://github.com/ArjenSchwarz/ workshop-cfn-macros
25. Step 1 25 • S3 Bucket for deploying Lambda code • cfn-lint (optional) • Pick your language • Ensure the Macro can pass through the template https://github.com/ArjenSchwarz/workshop-cfn-macros
27. Step 2 27 • Create SubnetNetworkAclAssociation
28. Step 3 28 • Create NetworkAclEntry resources
29. Step 4 29 • Finishing touches (optional) • Build the CloudFormation template • Deploy the template
30. Done! 30 • Test your function with the provided template • Think about what you want to build
31. 31 https://ig.nore.me bit.ly/ignoremevideos ArjenSchwarz ArjenSchwarz