Serverless

Question 1

Benefits of Serverless

Answer 1

• ease of use
• event based (doesn’t come online until someone makes a call)
• pay as you go - only pay the amount of time your code is running

Question 2

When to choose serverless on exam

Answer 2

favor serverless and managed services over traditional EC2

Question 3

Lambda Settings - Runtime

Answer 3

your environment

Question 4

Lambda Settings - Permissions

Answer 4

if your function makes an AWS API call, you need to attach a role

Question 5

Lambda Settings - Networking

Answer 5

• optional

- you can define the VPC, subnet and security groups the function is a part of

Question 6

Lambda Settings - Resources

Answer 6

you can define the amount of available RAM and CPU

Question 7

Lambda Settings - Trigger

Answer 7

what event will cause your function to start?

Question 8

Lambda Settings - Timeout*

Answer 8

max 15 minutes that a function can run

Question 9

Lambda Settings - Limits

Answer 9

max 10 GB of RAM

Question 10

Exam tips:

Answer 10

• Lambda is the answer if the question is “How do we add features to AWS to enforce things in AWS?”

Question 11

Ex: How do we check new EC2 instances to see if they are configured with all the necessary tags or shut it down

Answer 11

Lambda

Question 12

Ex: How do you automatically remove entries from a security group?

Answer 12

Lambda

Question 13

Ex: How do you build a microservice that only runs occasionally?

Answer 13

Lambda

Question 14

What can trigger Lambda:*

Answer 14

• S3
• CloudWatch Events
• API Gateway
• ALBs

Question 15

Do you need a VPC for Lambda

Answer 15

no, it’s optional, but if you want to access a private database or API, you can put your function inside a VPC

Question 16

What is a container?

Answer 16

a standard unit of software that packages up code and dependencies, so that the application runs quickly and reliably from one computing environment to another

Question 17

Dockerfile

Answer 17

text document that contains all the commands or instructions that will be used to build an image

Question 18

Image

Answer 18

an immutable file that contains the core libraries, dependencies and config files needed to run an application

Question 19

Registry

Answer 19

stores docker images for distribution

- can be public and private

Question 20

ECR

Answer 20

Elastic Container Registry

Question 21

Container

Answer 21

a running copy of an image that has been created

Question 22

Benefits of Containers

Answer 22

• create an immutable environment
• easily migrate from on-prem to AWS
• all environments are the same (i.e. Dev, and Prod are identical)

Question 23

ECS

Answer 23

• Elastic Container Service
• manages containers at scale
• role integration to talk to other parts of AWS
• easy to use
• built inside AWS, only works with AWS

Question 24

EKS

Answer 24

• Elastic Kubernetes Service
• opensource
• built by google
• can be use on-prem and in AWS
• heavy lift to manage, still has work to do to configure and integrate with AWS
• multi-cloud

Question 25

What exceptions would cause you to choose EKS over ECS?

Answer 25

- need something open source - need to run it on-prem otherwise choose ECS

Question 26

What exceptions would cause you to choose EKS over ECS?

Answer 26

- need something open source - need to run it on-prem otherwise choose ECS

Question 27

Fargate

Answer 27

serverless compute engine for containers that works with both ECS and EKS

Question 28

When to choose EC2 over Fargate?

Answer 28

- to use Reserved Instances - for long-running containers - multiple containers can share the same host

Question 29

When to choose Fargate over EC2?

Answer 29

- when you don't need operating system access - you pay based on the resources allocated and the time ran - excels at short-running tasks - isolated environments - containers that don't need to run all the time

Question 30

When to use Fargate over Lambda?

Answer 30

- when you have more consistent workloads | - allows docker use across the organization and a greater level of control by developers

Question 31

When to use Lambda over Fargate?

Answer 31

- great for unpredictable or inconsistent workloads - perfect for applications that can be expressed as a single function - light-weight - easily integrated into

Question 32

Fargate exam tip

Answer 32

Walk thru the use case for when to use Lambda vs EC2 vs Fargate before you go into the exam.

Question 33

Event Bridge

Answer 33

- formerly known as Cloud Watch Events - an event bus - allows you to pass events from a source to an endpoint - it's the glue that holds your serverless application together - when something happens or kicks off, it alerts the next step of the process - any API call that happens can kick off Event Bridge and Lambda

Question 34

What is the fastest way to respond to things in your environment?

Answer 34

Cloud Watch Events / Event Bridge

Question 35

Any AWS API call can trigger an Event Bridge Rule

Answer 35

use this to build in your own features

Question 36

Which is faster, Event Bridge, or scraping thru CloudWatch logs?

Answer 36

Event Bridge