Development, Messaging and deployment

Question 1

What is CI/CD?

Answer 1

It’s a software development best practice.
It’s automating everything like:
- code integration
- building
- testing
- deploying

Question 2

What are the benefits of CI/CD?

Answer 2

Makes changing easy, this helps delivering new features quickly.
So it’s:
- fast repeatable and automated

Question 3

Example workflow of a CI/CD pipeline:

Answer 3

• merge: to master repository
• prepare: code is built, tested and packaged
• Deploy: automatically deployed

Question 4

What does Continous Integration (CI) mean?

Answer 4

Integrating or merging small code changes frequently, at least once a day

Question 5

What does continuous deployment (CD) mean?

Answer 5

Automating the build, test and deployment functions - bugs are caught early, make it easier to fix them.

Question 6

What are the AWS Development Tools to implement CI/CD?

Answer 6

• AWS codeCommit
• AWS CodeBuild
  -Code depoly
• CodePipeline

Question 7

What is AWS CodeCommit?

Answer 7

A private Git repository

Question 8

What is CodeBuild?

Answer 8

Fully managed build and test service
like packages or docker image

Question 9

What is CodeDeploy?

Answer 9

It’s an automated Deployment Service that deploys to EC2, on premise or Lamda’s

Question 10

What is CodePipeline?

Answer 10

Automated CI/CD pipeline. It manages the pipeline for example executing codeCommit, codeBuild, CodeDeploy

Question 11

What is AWS CodeArtifact?

Answer 11

It’s an artifact Repo where you can safely store packages like Maven, NPM, Python

this artifact repo make is easy for developers to find the software packages they need.

Question 12

What are Artifacts?

Answer 12

Documentation
Compiled applications
Deployable Packages
Libraries

Makes it easier that everyone uses approved packages (instead of searching a package yourself on the internet)

Question 13

What is Tight Coupling?

Answer 13

Coupling is the dependency between components.
A Monolitic Application is tight coupled.

downsides:
- systems gets easier over loaded
- one failed component brings whole system down

Question 14

What is Loose Coupling?

Answer 14

An example of loose coupling is building app with Micro service application.

Benefits:
- a component doesn’t need to wait till another component completed his task
- Data and messages are moved between components of the application
- a slow or failed component doesn’t affect the whole system

Question 15

What are things to achieve the Application Integration Approach ?

Answer 15

• Queues (SQS - Simple Queue Service)
• Notifications (SNS - Simple Notification Service)
• Events (EventBride)

aws offers all service to achieve Application Integration Approach

Question 16

What is SNS (Simple Notification Service)?

Answer 16

a service that:
- Set ups, operates and sends Notifications
- sms / email
- Messages can be send to subscribers or other applications

Question 17

SNS uses a Pub-sub model. What does this mean?

Answer 17

Applications publish or push messages to a topic.

• topic = an access point

Question 18

What is Simple Queue Service (SQS)?

Answer 18

A service that creates a queue of things (like orders needed to be handled in a restaurant). It’s a distributed message queueing system that helps decoupling.

• SQS is pull based (user pulls next message when they are ready to process it
• Multiple components can add and consume messages
• Messages are processes asynchronously

Question 19

What is a short polling?

Answer 19

A response is returned immediately even if no messages in the que. You also pay for an empty response

Question 20

What is long polling?

Answer 20

a user periodically polls the que and only returns a message when there is something the queue.

Question 21

What is Simple Email Service (SES)?

Answer 21

Email service to send HTML formatted mails (eg. order confirmation)
you can track open rates etc.

Question 22

What is EventBridge?

Answer 22

EventBridge is all about Event Driven Architecture.
Events trigger actions

Question 23

What are StepFunctions?

Answer 23

StepFunctions gives a visualization of all small functions/lamda’s that happen in an application. For example a checkout process.

it :
- visualizes all steps
- Automates triggering an tracking all steps that need to happen
- Logg all step functions

Question 24

What is Infrastructure as Code (IaC)?

Answer 24

IaC helps to make sure that a production, development and testing environment are identical.

CloudFormation is the tool that create an Infrastructure as Code

Question 25

What is AWS Cloud Formation?

Answer 25

It Manages, configures and provisions your AWS Infrastructure as code.

• Resourced defined in a CloudFormation Yaml / JSON file
• Cloud formation interprets the template
• makes the right API calls to created the defined rersources

Question 26

What does AWS Elastic BeanStalk do?

Answer 26

helps developer focus on their code and not to worry about the infrastructure needed.

it:
- Deploys and scales your web applications
- provides the AWS resourced for ypu (like EC2, RDS, S3 etc)