Serverless Applications

Question 1

Which of the following can be triggered by an S3 event?
A.) AWS Step Function
B.) AWS Lambda Function
C.) EC2 Autoscaling Group

Answer 1

B.) AWS Lambda Function

Question 2

Are Restful APIs stateless?
Are WebSocket APIs stateless?

Answer 2

Restful APIs are stateless
WebSocket APIs are stateful

Question 3

How does one set up canary deployments in Lambda?

Answer 3

Ensure that the lambda deploys with versioning enabled, then use a lambda alias that routes a percent of traffic to the new version and the rest to the old version.

Question 4

What is Spot Instance Draining in AWS

Answer 4

Spot Instance Draining is a feature that automatically notifies an application when a Spot Instance is about to be terminated by AWS due to price changes or capacity constraints. When the instance is marked for termination, AWS provides a two-minute warning to the application, allowing it to gracefully shut down or migrate tasks.

Question 5

What are the benefits of Spot Instance Draining?

Answer 5

Graceful shutdown: Allows for clean termination of services, reducing data loss.
Task migration: Gives time to migrate workloads to other instances or save progress.
Improved availability: By draining the instance properly, other tasks or services can be shifted without disruption.
Cost efficiency: Maximizes the use of Spot Instances while avoiding abrupt termination.