Serverless

Question 1

What is Serverless?

Answer 1

Focus on running code, and no need to manage the compute infrastructure

Question 2

What are 3 benefits of Serverless?

Answer 2

1. Pay as you go
2. event based processing
3. easy to use

Question 3

What tools do you want to focus on in the exam?

Answer 3

Pick managed tools and favor serverless over unmanaged tools like EC2 and OS

Question 4

What is AWS Lambda?

Answer 4

Service that lets you run code without needing to manage any underlying compute servers

Question 5

What permissions to Lambda need?

Answer 5

It needs a role with whatever access needed to do work and basic lambda execution

Question 6

What is the max memory and cpu for Lambda?

Answer 6

Max 10 GB, CPU scale proprotinately

Question 7

How are you billed with Lambda?

Answer 7

Billed by lambda duration and resource configuration

Question 8

What is the time max limit for Lambda?

Answer 8

15 minutes

Question 9

What are good use cases for Lambda?

Answer 9

Microservices, short running code, need to trigger to start/stop instances or remove entries in SG (add features or enforce things)

Question 10

What do you need to do if you want Lambda to make private api calls or talk to a db?

Answer 10

You need to have the lambda run in a VPC/subnet with SG, otherwise it can run outside that

Question 11

What is the difference between containers and vm?

Answer 11

Containers run ontop of the guest os instead of having to duplicate the OS for each application/VM

Question 12

What are containers?

Answer 12

Packaging of an application and all its depdencies for a standardized setup for different environments

Question 13

What are containers seen as on the exam? When should you pick containers?

Answer 13

Seen as flexible

Pick when you need flexibility, moving around different environments, portable between on-prem and aws

Question 14

What is ECS?

Answer 14

A managed AWS service that orchestrates at scale running thousands of containers, placing containers where appropriate

Question 15

What is ECS vs EKS?

Answer 15

ECS is AWS proprieteary but is simple to use

EKS is open source Kubernetes, that can be hybrid on-prem but has more setup

Question 16

When should you pick EKS on the exam?

Answer 16

If the exam mentions opensource, on-prem, Kubernetes

Question 17

Why use Fargate over ECS?

Answer 17

Fargate takes out the work of managing the underlying servers that containers run on.

Question 18

What kind of applications is ECS good for?

Answer 18

Long running or short running applications

Question 19

What must be used with Fargate?

Answer 19

EKS or ECS

Question 20

When should you use ECS EC2 vs Fargate?

Answer 20

EC2 for long running applications, when you want to use the EC2 cost savings, you are okay with container sharing same host
Fargate for short running tasks, billing based on resource and time, you need an isolated env

Question 21

When should you use Lambda vs. Fargate?

Answer 21

Use Lambda for short running and simple functions, inconsistent workloads
Fargate is good for longer running applications, consistent workloads

Question 22

What do you configure for Event Bridge?

Answer 22

You configure Rules that define a condition to trigger the rule and an action of where to send the event.