Compute - AWS Lambda

Question 1

What is AWS Lambda?

Answer 1

• AWS Lambda is a serverless compute service.
• It allows you to run application code without managing EC2 instances.
• Compute resources are managed and provisioned by AWS.

Question 2

What does “serverless” mean in the context of AWS Lambda?

Answer 2

• Serverless means not worrying about provisioning and managing compute resources.
• AWS manages the compute resources, starting, stopping, and scaling as needed.

Question 3

How is AWS Lambda priced?

Answer 3

• AWS Lambda charges for compute power per 100 milliseconds of use.
• You only pay when your code is running and for the number of times it runs.
• Sub-second metering provides cost optimization.

Question 4

What are the steps involved in the operation of AWS Lambda?

Answer 4

• Upload or write code within Lambda.
• Configure Lambda functions to execute code upon triggers.
• When a trigger occurs, Lambda runs the code using the required compute power.
• AWS records compute time and function invocations for cost calculation.

Question 5

What are the key constructs of an AWS Lambda application?

Answer 5

• Lambda function: Your own code invoked by Lambda.
• Event source: AWS service that triggers Lambda functions.
• Trigger: Operation from an event source that invokes the function.
• Downstream resources: Resources used during function execution.
• Log streams: Recorded events and logs in CloudWatch.

Question 6

How can you create a Lambda function via the AWS Management Console?

Answer 6

• Select a blueprint, which is a preconfigured Lambda function template.
• Customize the blueprint as necessary.
• Configure triggers, such as an S3 put request.
• Upload or edit code, define resources, execution timeout, IAM Role, and Handler Name.

Question 7

What are the benefits of using AWS Lambda?

Answer 7

• Serverless and scalable compute service.
• Cost optimization compared to managing EC2 instances.
• Pay only for compute power while the code is running and for function invocations.