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Learn how to properly set the minimum permissions for your AWS Elasticsearch instance in your CloudFormation template.
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Setting the Minimum Role for Your AWS Elasticsearch Instance with CloudFormation

When working with AWS services, maintaining the principle of least privilege is crucial. This is where you define the minimum permissions required for a specific function or service. If you’re working with an Elasticsearch instance in AWS, particularly through a CloudFormation template, it’s vital to correctly establish these permissions.

In this guide, we will explore how to set the minimum role for your Elasticsearch instance's PUT method, ensuring your AWS resources operate correctly without unnecessary privilege escalation.

Understanding the Problem

The question we’re addressing is straightforward: How do you set the minimum permissions for your Elasticsearch instance while using a CloudFormation template? The original template provided has a role that appears to be generally correct, but it has a mistake in the resource ARN that limits its functionality.

Key Concerns

Incorrect Resource Declaration: The provided permissions may not match correctly with the function defined in the CloudFormation template.

Ensuring Correct Functionality: Without the proper role and permissions, your Lambda function won't execute as intended.

Breaking Down the Solution

Let’s analyze the provided CloudFormation template and modify it to ensure that the IAM Role correctly specifies the necessary permissions.

Step 1: Review the IAM Role Configuration

The IAM role for your Lambda function is defined with a policy that permits creating log groups and streams as below:

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

Step 2: Correct the Resource ARN

The original code has a mismatch in the log group resource identifier. Here’s the incorrect part:

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

To align this with the actual function name (elast as per our template), you need to replace furl with elast:

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

This small change ensures that your Lambda function can access the logs it needs without facing permission errors.

Final IAM Role Configuration

Here's how your final IAM role configuration should look:

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

Conclusion

Setting the correct permissions when working with AWS resources is essential to ensuring that your applications run smoothly and securely. By correcting the resource ARN in your IAM role, you'll allow your Lambda function to log its performance and errors effectively.

Remember, always check your resource identifiers and ensure they align with your function names to avoid permission issues in the future. With the above adjustments, your CloudFormation template should work seamlessly with Elasticsearch.

Happy coding!