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Learn how to effectively `update tags` for your AWS CloudFormation stacks using the AWS CLI without overwriting existing templates.
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Updating Tags in an AWS CloudFormation Stack Using AWS CLI

Updating tags for an AWS CloudFormation stack can be quite complex if you're not familiar with the appropriate methods available through the AWS Command Line Interface (CLI). This guide will walk you through the necessary steps to update your stack's tags in a straightforward manner.

The Challenge

The primary challenge that many users face is that the AWS CLI does not allow direct tag updates using the update-stack command by simply appending new tags. Instead, when you try to run a command like:

[[See Video to Reveal this Text or Code Snippet]]

You will encounter a limitation as this command does not recognize the --tags option in the way you may expect.

Common Misunderstandings

Using Previous Template: Some users might think that running commands like the following would preserve existing tags while adding new ones:

[[See Video to Reveal this Text or Code Snippet]]

However, using the --template-body option essentially overwrites your previous settings, including tags. So, it's crucial to understand that dumping your entire stack configuration back into this command will not yield the desired results.

Retrieving Live CloudFormation JSON: Many wonder if it's possible to download the live CloudFormation template in JSON format. Fortunately, the AWS CLI provides an option to retrieve the current template.

The Solution: Updating Tags with Python and Boto3

To truly update your CloudFormation stack tags without losing existing configurations, you can do so using a combination of Python and the Boto3 library. Follow these steps:

Step-by-Step Guide

Set Up: Make sure you have Python and Boto3 installed in your environment.

Retrieve Current Stack Information:

Begin by retrieving the existing stack's template and tags using the Boto3 library:

[[See Video to Reveal this Text or Code Snippet]]

Prepare the Update:

After you fetch the template, clean it up by removing unnecessary metadata. This ensures you're only updating the core details, including tags:

[[See Video to Reveal this Text or Code Snippet]]

Add New Tags:

Create a dictionary for the new tags you wish to add:

[[See Video to Reveal this Text or Code Snippet]]

Execute the Update:

Finally, call the update_stack function using your prepared response. The code below will perform the update:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Updating tags in your AWS CloudFormation stacks doesn't have to be a daunting task. With this step-by-step guide, you have learned how to manipulate stack data using Python and Boto3, alleviating the constraints you've previously encountered with the AWS CLI commands alone.

For AWS users looking to maintain organization and clarity in their resources, properly managing tags is imperative. Implement this guide today to ensure your CloudFormation stacks remain up-to-date with the correct tags seamlessly.