Chapter 3: Developing a Serverless Function with Lambda

1. What's the command-line command to create an IAM role for an AWS Lambda function?

Answer: Create an IAM role with the below command; it allows Lambda function to call AWS services under your account:

aws iam create-role ROLE_NAME --assume-role-policy-document file://assume-role-lambda.json

The assume-role-lambda.json file contains the following:

{  
 "Version":"2012-10-17",
 "Statement":[  
  {  
  "Effect":"Allow",
  "Principal":{  
   "AWS":"*"
  },
  "Action":"sts:AssumeRole"
  }
 ]
} 

3. What's the command-line command to create a new S3 bucket in the Virginia region (us-east-1) and upload a Lambda deployment package to it?

Answer: The following command can be used to create an S3 bucket:

aws s3 mb s3://BUCKET_NAME...