Serverless

Question 1

Lambda

Answer 1

global

compute service; allows you to upload your code and create a lambda function

takes care of provisioning and managing the servers that you use to run the code

Question 2

traditional vs serverless architecture

Answer 2

API gateway is frontend for serverless requests

usually a loadbalancer is the frontend for traditional

Question 3

lambda language support

Answer 3

node.js
java
ptyhon
c#
go
powershell

Question 4

Serverless services

Answer 4

Aurora
DynamoDB
API Gateway

Question 5

AWS X-ray

Answer 5

X-ray allows you to debug what happens with Lambda

Question 6

Lambda triggers

Answer 6

Alexa skill
Cognito
IoT rule
SNS
Kinesis
SQS
S3
DynamoDB
EventBridge
CloudWatch
API Gateway

Question 7

SAM - acronym

Answer 7

serverless application model

Question 8

SAM - definition

Answer 8

CloudFormation extension

framework that allows you to build serverless apps easily

can run serverless applications locally

can package and deploy with CodeDeploy

Question 9

SAM types

Answer 9

functions
APIs
tables

Question 10

ECS - acronym

Answer 10

elastic container service

Question 11

ECS - definition

Answer 11

managed container orchestration service to allow you to run/scale containerized apps

ECS manages EC2 or Fargate instances

Creates clusters to manage fleets of container deployments

defines rules for CPU and memroy reqs

monitors resource utilization

FREE

Integration with: VPC, sec groups, EBS, ELB, Cloudwatch, CloudTrail

Question 12

containerized application

Answer 12

package that contains an app, libraries, runtime, and tools required to run it

bundle that contains an app and all it’s dependencies

provides isolation benefits of virtualization w/ less overhead and faster starts than VMs

portable

runs on container engine (like Docker)

Question 13

ECS components

Answer 13

Cluster - logical collection of ECS resources
Task definition - defines application. Can contain multiple containers
Container definition - inside task def. Defines individual containers a task uses; controls CPU/RAM allocation
Task - single running copy of any container defined by task def
Service - allows task defs to be scaled by adding tasks; defines min and max values
Registry - repository for container images. Used to download images to create containers

Question 14

Fargate

Answer 14

serverless container engine
eliminates need to create/manage resource
Works with ECS and EKS(elastic kubernetes service)
Each workload runs in its own kernel

Question 15

EC2 vs Fargate

Answer 15

Choose EC2 if:

• Compliance reqs
• Require broader customization
• Require GPU

Question 16

EKS - acronym

Answer 16

Elastick kubernetes service

Question 17

Kubernetes (K8)

Answer 17

open-source software that lets you deploy and manage containerized apps at scale

Question 18

EKS - definition

Answer 18

same toolset on-prem and in cloud

containers grouped in pods (similar to task in ECS)

supports EC2 and fargate

Question 19

EKS vs ECS

Answer 19

Choose EKS if:

• already using K8s

- want to migrate to AWS

Question 20

ECR - acronym

Answer 20

elastic container registry

Question 21

ECR - definition

Answer 21

managed docker container registry in AWS
integrated w/ ECS and EKS
HA
integrated w/ IAM
Works w/ on-prem deployments
pay for storage and data transfer

Question 22

ECS + load balancing

Answer 22

ALB is preferred:

• dynamic host port mapping
• path based routing
• priority rules

Supports all load balancers

Question 23

ECS EC2 instance role

Answer 23

applies policy to all tasks running on EC2 instance

Question 24

ECS task role

Answer 24

Apply policy on a per task basis

Question 25

API gateway

Answer 25

makes it easy for devs to publish, maintain, monitor, and secure APIs at scale

Acts as a front door to AWS resources like: EC2, Lambda, DynamoDB

Question 26

API gateway caching

Answer 26

reduce # of requests to API

caches responses for a TTL

Question 27

Same origin policy

Answer 27

A browser will allow scripts in webpage A to access data in webpage B ONLY if both webpages have the same origin (domain name)

Prevents XSS

Question 28

CORS - Cross-origin resource sharing

Answer 28

allows restricted resources on a web page to be requested from another domain outside of the domain from the first resource