Lambda Invocation and Logs Lab

Goal

Reinforce Execution roles, Invocation, CloudWatch Logs, Timeouts, Handler behavior through a small, inspectable activity.

Concepts Reinforced

• Execution roles
• Invocation
• CloudWatch Logs
• Timeouts
• Handler behavior

Prerequisites

• An existing Lambda execution role with AWSLambdaBasicExecutionRole
• AWS CLI and zip utility

Estimated Cost

Exact Steps

1. Create a small handler that logs the incoming event and returns a JSON response.
2. Package the handler into a zip file.
3. Create a Lambda function with the execution role ARN.
4. Invoke the function with a sample event.
5. Read CloudWatch Logs for the request id.

exports.handler = async (event) => {
  console.log(JSON.stringify({ event }));
  return { statusCode: 200, body: JSON.stringify({ ok: true }) };
};

Verification

• The invocation response contains StatusCode 200.
• The log stream contains the test event and request id.

Cleanup Steps

• Delete the Lambda function.
• Delete the related CloudWatch log group if it is no longer needed.

Sources and Review Metadata

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