Cloud Formation Functional Validation

0

I want to know if there is an AWS tool available to be able to check the correctness of cloud formation templates. So not to check the syntax or structure but the logic of the template This is an example of what I mean. To create a vpc you need a CIDR block. If you don't add a CIDR block to the template the the cloud formation validate template command will pass however logically it will fail because the necessary parameter is not provided

Eli
asked 21 days ago127 views
3 Answers
1
Accepted Answer

Hi Eli,

Please Try this solution it will be helpfull for you and also follow aws documentation link you will get more information.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-validate-template.html#:~:text=During%20validation%2C%20AWS%20CloudFormation%20first%20checks%20if%20the,--template-body%20parameter%2C%20or%20remotely%20with%20the%20--template-url%20parameter.

Install AWS CloudFormation Guard: AWS CloudFormation Guard is a policy-as-code tool that allows you to define rules to validate your CloudFormation templates. Install it using npm:

npm install -g @aws-cloudformation/cloudformation-guard

Create Guard Rules: Define rules to validate the logical correctness of your templates. For example, to ensure a VPC resource has a CIDR block, create a file named vpc.guard with the following content:

rule vpc {   Resources.MyVPC.Properties.CidrBlock == /[0-9]{1,3}(\.[0-9]{1,3}){3}\/[0-9]{1,2}/ }

Validate the Template: Use the cfn-guard command to validate your CloudFormation template against the defined rules. Assume your template file is named template.yaml:

cfn-guard validate -r vpc.guard -t template.yaml

This will check if the VPC resource in your template has a valid CIDR block.

Use CloudFormation Change Sets: Before applying changes, use Change Sets to preview how the proposed changes might impact your stack. This helps catch logical errors that may not be evident from static analysis alone.

aws cloudformation create-change-set --stack-name my-stack --template-body file://template.yaml --change-set-name my-change-set

aws cloudformation describe-change-set --change-set-name my-change-set --stack-name my-stack



answered 21 days ago
profile picture
EXPERT
reviewed 21 days ago
profile picture
EXPERT
A_J
reviewed 21 days ago
0
profile picture
EXPERT
A_J
answered 21 days ago
0

Thank you. I would check it out

Eli
answered 21 days ago

You are not logged in. Log in to post an answer.

A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker.

Guidelines for Answering Questions