AWS & Serverless

Question 1

AWS API Gateway allows you to create, publish, maintain, monitor and secure what?

Answer 1

APIs

Question 2

Can the APIs you create be scalable by default?

Answer 2

Yes

Question 3

APIs created can access what two key things?

Answer 3

AWS Web services & Data stored on AWS Cloud

Question 4

A client hits an registered API endpoint that’s connected to what?

Answer 4

API Gateway

Question 5

Once the client hits an endpoint the API Gateway receives a method request that is processed through Gateway’s integration. It can respond by calling a Lambda or accessing data through services such as -> DynamoDB, EC2, S3 etc. This process is considered what?

Answer 5

An integrational request.

Question 6

The AWS API Gateway is considered to be a ____ between your app and AWS services

Answer 6

mediator

Question 7

An incoming response from the executed service (Lambda or another service) is processed through the Gateway’s integration than returns to the client as a method response. What is this process called?

Answer 7

An integrational response.

Question 8

You just created a new API what is the next step?

Answer 8

Create a resource

Question 9

What is a resource?

Answer 9

The path that is the direct endpoint the client can hit in order to trigger an action

Question 10

Your new API now has a resource what is the next step in order to gain use out of the resourcePath (endpoint)

Answer 10

Add an access method for that resourcePath (REST API HTTP methods… GET, POST etc)

Question 11

The resource of the new API is set up with an access method, what is the next thing that must be done?

Answer 11

You must stage (or deploy) your API.

Question 12

When defining an access method for a resource you must specify what?

Answer 12

An integration type -> Lambda Function, HTTP, Mock or other Service.

Question 13

AWS CloudWatch essentially allows you to do what?

Answer 13

Watch/Monitor -> AWS Cloud resources/services

Question 14

AWS CloudWatch has logging, and metrics but what another key thing can it do?

Answer 14

send out alerts or alarms about errors or any information.

Question 15

You create what based on CloudWatch monitoring feedback?

Answer 15

events to be triggered.

Question 16

These trigger events include:

Answer 16

A Lambda or other cloud services and starting/shutting down instances.

Question 17

AWS offers an event-driven computing cloud service, that utilizes FaaS on a pay-per-use basis. What is the name of the core service that makes all this work?

Answer 17

AWS Lambda

Question 18

The benefit of AWS Lambda from a developer sense is that….

Answer 18

You only worry about the code (serveless, amazon takes care of server scaling and systems)

Question 19

Each Lambda function runs based off of some cloud service or http event. Lambda’s architecture is made up of what 3 three things?

Answer 19

Stateless function, Isolated in its own environment, is its own resource in the AWS system.

Question 20

The Lambda function is stateless/immutable, it will listen to an “ALLOWED” event/trigger from a resource and make changes/updates to “ALLOWED” resources. When these changes are made what happens next?

Answer 20

The lambda returns an integrational response to AWS API Gateway -> that then returns a payload response to the client.

Question 21

What is the benefit of AWS Lambda (FaaS) from a business sense.

Answer 21

Big savings ($$). The cost to time ratio of getting the architecture setup is tremendously low in cost and quick in time.

Question 22

Step Functions are basically what

Answer 22

State Machines

Question 23

State Machines (step functions) allow you to organize ____ and build a back in architecture that perform different things.

Answer 23

Lambdas

Question 24

In a state machine architecture it is composed of lambdas but how when lambdas are stateless?

Answer 24

One lambda functions output (data/state) can be used as input in the NEXT lambda function. Hints “Step Functions” they run step by step.

Question 25

Where do you go in AWS to create state machines?

Answer 25

AWS Step Function service console

Question 26

A State Machine is made up of a few key parts, but the meat of the state machine can be found in what property of the state machine JSON.

Answer 26

"State"

Question 27

The states key in the State Machine defines what?

Answer 27

Different states (step functions) that compose to make the state machine.

Question 28

Each "state" in the state machine has a name, type, resource, resultPath & end. What is the name referring to?

Answer 28

The name of the step function

Question 29

Each "state" in the state machine has a name, type, resource, resultPath & end. What is the type defining?

Answer 29

What action the state or step function will take/execute. As well as what type of state it is.

Question 30

Each "state" in the state machine has a name, type, resource, resultPath & end. What is the Resource key referring to?

Answer 30

What Lambda will be called. Typically this key will have a Lambda arn:id to identify the lambda needed.

Question 31

Each "state" in the state machine has a name, type, resource, resultPath & end. What is the resultPath referring to?

Answer 31

Where you can find in the state's or step function's output (object) the data or state changes.

Question 32

The are multiple ways to get a state machine to began. How can you use a lambda to do this?

Answer 32

A Lambda will listen for an event in order to trigger the 1st step function to execute in the chain.

Question 33

How does the lambda know what state machine to execute and what is the lambda acting as?

Answer 33

The lambda acts as an execution machine, which will execute the right state machine based on arn:id

Question 34

What is serverless?

Answer 34

A way to cloud compute client resource changes and application responses without worrying about the server. (Services used will handle provisioning, scaling and allocation of servers)

Question 35

How does serverless run at large scale?

Answer 35

It uses multiple stateless computation containers (functions) That are event-triggered. The cloud provider manages this.

Question 36

A middle man must be setup between the client & cloud provider in order to make this all work. What is that middle man?

Answer 36

An API Gateway

Question 37

FaaS is basically the system architecture used in serverless. What does FaaS stand for.

Answer 37

Functions As A System

Question 38

Serveless architecture is composed of what 5 things?

Answer 38

Web server, Lamda Functions (FaaS), security token service, user authentication, and database.