Summary

The web content describes troubleshooting a CloudFormation template error related to unresolved resource dependencies, providing guidance on identifying and correcting parameter reference issues within the template.

Abstract

The article addresses a common issue encountered when working with AWS CloudFormation templates, specifically the "Template format error: Unresolved resource dependencies" error. The author, Teri Radichel, explains that this error occurs when a parameter or resource is referenced incorrectly in the template, often due to typos or unupdated references after renaming parameters. The article includes a personal anecdote where Radichel encountered the error after renaming a parameter but failing to update all instances of its use in the template. Visual examples are provided to illustrate the incorrect and corrected references. Additionally, the article promotes Radichel's expertise in cybersecurity, her company's services, and her various channels for content distribution, including a Medium series on automating cybersecurity metrics, a GitHub repository for code, and social media platforms for further engagement.

Opinions

The author emphasizes the importance of careful parameter naming and consistent reference updating in CloudFormation templates to avoid errors.
Radichel suggests that readers check for typos and ensure that parameter names are correctly updated throughout the template when encountering such errors.
The article implies that the author's experience and credentials, such as being a SANS Award recipient and an AWS Security Hero, lend authority to the guidance provided.
By offering free content on cybersecurity careers and jobs, as well as an email list, the author aims to provide value to the reader beyond the immediate technical solution.
The recommendation of an AI service at the end of the article suggests the author's endorsement of cost-effective tools that offer similar capabilities to more expensive options like ChatGPT Plus (GPT-4).

Template format error: Unresolved resource dependencies […] in the Resources block of the template

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An error occurred (ValidationError) when calling the CreateChangeSet operation: Template format error: Unresolved resource dependencies […] in the Resources block of the template

When you are referencing a parameter or resource that doesn’t exist in your CloudFormation template.

Look for a typo — or in my case I renamed a parameter but did not change the name of the parameter every where it was used in my template.

You can search for the value that the error message is complaining about and evaluate what it is tryint to reference. Fix the name of the value to match the parameter or resource you intended to reference with that name.

In my case I changed the name of a parameter to EnvParam

However I still had the old name in my template here:

I needed to change that to:

Follow for updates.

About Teri Radichel:
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⭐️ Author: Cybersecurity Books
⭐️ Presentations: Presentations by Teri Radichel
⭐️ Recognition: SANS Award, AWS Security Hero, IANS Faculty
⭐️ Certifications: SANS ~ GSE 240
⭐️ Education: BA Business, Master of Software Engineering, Master of Infosec
⭐️ Company: Penetration Tests, Assessments, Phone Consulting ~ 2nd Sight Lab

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Follow for more stories like this:
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❤️ Twitter: @teriradichel
❤️ LinkedIn: https://www.linkedin.com/in/teriradichel
❤️ Mastodon: @teriradichel@infosec.exchange
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