Why serverless matters in AWS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a serverless function handler in AWS Lambda.

AWS

def lambda_handler(event, context):
    return [1]

Drag options to blanks, or click blank then click option'

A"Hello from Lambda!"

Bprint("Hello")

Cevent + context

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of return

Returning None which gives no response

The Lambda handler must return a response, here a simple string message.

2fill in blank

medium

Complete the code to create an AWS Lambda function with a runtime environment.

AWS

resource "aws_lambda_function" "example" {
  function_name = "my_lambda"
  runtime       = [1]
  handler       = "index.lambda_handler"
  role          = aws_iam_role.lambda_role.arn
  filename      = "function.zip"
}

Drag options to blanks, or click blank then click option'

A"java8"

B"python2.7"

C"nodejs10.x"

D"python3.9"

Attempts:

3 left

💡 Hint

Common Mistakes

Using outdated runtimes

Choosing a runtime that doesn't match the code

Using a modern supported runtime like python3.9 ensures better performance and support.

3fill in blank

hard

Fix the error in the AWS SAM template to define a serverless function with correct memory size.

AWS

Resources:
  MyFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: index.handler
      Runtime: python3.9
      MemorySize: [1]

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A512MB

B0.5GB

C512

D512MBs

Attempts:

3 left

💡 Hint

Common Mistakes

Adding units like MB or GB

Using decimal or string values

MemorySize must be an integer value in MB without units.

4fill in blank

hard

Fill both blanks to configure an API Gateway trigger for a Lambda function in Terraform.

AWS

resource "aws_lambda_permission" "apigw" {
  statement_id  = "AllowAPIGatewayInvoke"
  action        = [1]
  function_name = aws_lambda_function.my_lambda.function_name
  principal     = [2]
  source_arn    = aws_api_gateway_rest_api.myapi.execution_arn
}

Drag options to blanks, or click blank then click option'

A"lambda:InvokeFunction"

B"lambda:InvokeAsync"

C"apigateway.amazonaws.com"

D"events.amazonaws.com"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong action like InvokeAsync

Wrong principal service

The action must be 'lambda:InvokeFunction' and the principal is 'apigateway.amazonaws.com' to allow API Gateway to invoke Lambda.

5fill in blank

hard

Fill all three blanks to define a serverless function with environment variables and timeout in AWS SAM.

AWS

Resources:
  MyFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: index.handler
      Runtime: python3.9
      Timeout: [1]
      Environment:
        Variables:
          STAGE: [2]
          LOG_LEVEL: [3]

Drag options to blanks, or click blank then click option'

A30

B"prod"

C"INFO"

D300

Attempts:

3 left

💡 Hint

Common Mistakes

Setting timeout too high

Not quoting environment variable strings

Timeout is set to 30 seconds, STAGE environment variable to 'prod', and LOG_LEVEL to 'INFO' as strings.