Скачать или смотреть Resolving AWS Lambda IAM Role Permissions Issues for SQS Access

Learn how to effectively set up IAM roles for AWS Lambda functions, enabling one to access both Lambda and SQS policies. This guide breaks down required configurations and common pitfalls in a clear manner.
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This video is based on the question https://stackoverflow.com/q/64946741/ asked by the user 'user672009' ( https://stackoverflow.com/u/672009/ ) and on the answer https://stackoverflow.com/a/64953855/ provided by the user 'Marcin' ( https://stackoverflow.com/u/248823/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

In the world of cloud computing, Amazon Web Services (AWS) offers numerous tools for developers, one of which is AWS Lambda. It allows you to execute code in response to events without managing servers. However, managing permissions through IAM (Identity and Access Management) roles can sometimes be tricky, especially when dealing with multiple functions that require different access levels.

This post addresses a common problem: configuring two AWS Lambda functions, each with distinct IAM roles—one with access to Lambda policies and the other with additional permissions for SQS (Simple Queue Service). Let’s dive into the solution!



Understanding the Problem

You are trying to create two AWS Lambda functions:

ServerlessExampleBook - Requires access to Lambda policies.

ServerlessExampleEvent - Requires access to both Lambda policies and SQS.

Current Setup

You initially set up the following resources in Terraform:

Two Lambda functions

Two IAM roles associated with those functions

One SQS queue and mapping for SQS events

However, you encountered an error message stating:

"The provided execution role does not have permissions to call ReceiveMessage on SQS"

This error indicates a configuration issue where the Lambda function intended to interact with SQS lacks the necessary permissions.



Solution Breakdown

To resolve the issue, we need to ensure that the IAM roles are correctly configured and that the right Lambda function is referenced in your event source mapping. Here’s how to fix it step-by-step:

1. Role Configuration Check

First, confirm that the IAM role associated with the ServerlessExampleEvent Lambda function has the correct SQS permissions. The IAM policy should look like this:

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

2. Event Source Mapping Correction

The main error arises from the aws_lambda_event_source_mapping resource. In your original setup, you had:

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

This configuration mistakenly pointed to the function that tests basic Lambda permissions, not the one that also requires SQS access. Instead, you should reference the second function:

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

3. Final Touches

After making these changes, ensure that all your resources are correctly defined and deploy them using Terraform. Your corrected configurations will resemble this:

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



Conclusion

By correcting the IAM role permissions and properly referencing the correct Lambda function in your event source mapping, you should be able to resolve any IAM-related errors encountered when the functions attempt to interact with SQS.

Setting up AWS services, such as Lambda and SQS, requires careful attention to IAM roles and permissions. Ensuring that each function has the appropriate permissions will facilitate smoother interactions and prevent execution errors.

If you're still facing challenges, revisit your IAM policies or consult AWS documentation for further insights.

With this guide, you now have the tools necessary to effectively manage AWS Lambda functions and their associated permissions. Happy coding!