How do IAM policies affect AWS Lambda functions?

How do IAM policies affect AWS Lambda functions?

IAM policies are crucial for controlling access to AWS Lambda functions. They define who can invoke, manage, or modify your functions.

Can you give me an example of an IAM policy for a Lambda function?

Sure! Here's a simple policy that allows a user to invoke a specific Lambda function:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "lambda:InvokeFunction",
      "Resource": "arn:aws:lambda:us-east-1:123456789012:function:my-function"
    }
  ]
}

What are the best practices for securing Lambda functions with IAM?

Best practices include using least privilege principles, regularly reviewing policies, and enabling logging to monitor access.

How can I troubleshoot permission issues with my Lambda functions?

You can check CloudWatch logs for error messages, review IAM policies for correct permissions, and use the AWS Policy Simulator.