Dev Ops Flashcards by Luiz Martins

What services can CodeDeploy deploy to? (With the exception of Cloudformation)

EC2, ECS, Lambda and Auto-Scaling Group. Can also deploy to on-prem

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Whats the AWS IDE Service?

AWS Cloud9

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What are the CodePipeline existing step types?

-Source
-Build
-Deploy
-Test
-Invoke (Invokes custom function)
-Approval

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AWS OpsWork provides managed instances to run what services?

Chef or Puppet

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True or False: The recommended monitoring services recommended for debuggind microsrvice architectures are X-Ray and CloudTrail

True

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What’s the default file that configures the actions to be executed in code build?

buildspec.yml

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What’s the default file that configures the code deploy?

appspec.yml

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What IaC services are available on AWS?

-AWS Cloudformation
-AWS Cloud Development Kit (CDK)
-AWS Copilot
-AWS Proton
-AWS App2Container

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What is the AWS CDK?

It’s a software development framework on a format similar to programming languages.

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True or False: AWS CDK uses Cloudformation under the hood to create it’s resources

True

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What is AWS Copilot?

Copilot is a CLI for launching and managing containerized applications, automating deployment pipelines, and deploying application infrastructure on AWS

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True or false: Copilot can only launch resources in services directly related to container images, such as ECS and ECR, with other resources such as ELBs having to be created using a different service

False, Copilot can create resources on most services useful for a containerized aplication, including ELBs, VPCs and ECR registries

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What is AWS Proton?

AWS Proton is a fully managed delivery service for containerized applications. It includes tools for infrastructure provisioning, code deployments, monitoring, and updates

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What is App2Container?

AWS App2Container (A2C) is a command-line tool for converting .NET and Java applications into containerized applications

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It is possible to configure how an AWS Cloudformation Stack will treat its resources when it’s deleted through DeletionPolicy. What kinds of deletion policies are there?

-DeletionPolicy=Retain: Resources created are not deleted
-DeletionPolicy=SnapShot: Create a SnapShot before deleting. Only works for some resources. Ex: EBS, RDS DBInstance
-DeletionPolicy=Delete: Default behaviour. Delete the resource.

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What is a CloudFormation custom resource?

It is a resource created to address any use case not presently addressed on CloudFormation.

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How do CloudFormation custom resources work?

You create a Lambda Function that is accessed by CloudFormation and this Lambda fucntion is responsible for creating your resource.

In which cases are CloudFormation custom resources useful?

-To implement a new service not supported yet
-To perform on-prem deployments
-To empty an S3 bucket before deleting
-Etc

What is CloudFormation Drift?

It is a functionality that detects if a resource created by a stack has been altered when compared to the stack template.

True or False: It is possible to import a stack to another new stack using CloudFormation Resource Import

True

True or False: A Cloudformation Stack can be imported by multiple Stacks ate the same time using CloudFormation Resource Import

False, it can be inside only one stack at a time

True or false: Copilot can only deploy to Fargate, not EC2

True

What are the types of service architectures available on Copilot?

-Request-driven web service
-Load balanced web service
-Backend service
-Worker service

What is Amazon CodeGuru?

It’s a service that uses ML to automates code reviews by identifying code mantainability and security issues and perform application recommendations.

What are CodeGuru's main functionalities?

-CodeGuru Reviewer: Automates code review for static code analysis (development) -CodeGuru Profiler: Visibility/recommendations about application performance during runtime (production)

True or False: Amazon CodeGuru Reviewer supports Java, JS, Python and Ruby

False, only Python and Java

Explain the difference between rolling updates and blue/green deployment

-Rolling updates: Gradually replaces old versions of the application for new ones. -Blue/Green deployment: Creates a mirror of the application with a new version and slowly redirects traffic to it.

You have an ECS Task with a desired count of 4 running with 4 containers online. A new version of the container is launched and will be implemented using a rolling update. If the minimumHealthyPercent is 50 and the maximumPercent is 150, how many instances of each type will be left running when the rolling update starts?

2 of the 1st version and 4 of the 2nd version.

What are the 3 types of Blue/Green deployment (Only names)?

-Canary Deployment -Linear Deployment -All-at-once deployment

Describe how a Blue/Green canary deployment works

A canary deployment creates a mirror of the application with the new version of the deployment and redirects a small percentage of the application traffic there. If no errors are identified you then shift over the rest of the traffic.

Describe how a Blue/Green linear deployment works

A Linear Deployment works by costantly redirecting a percentage of traffic to the new dploymetn version every x period of time. Ex: 10% every 3min

Describe how a Blue/Green all-at-once deployment works

You shift all traffic to the new version immediately

What services on AWS are responsible for a rolling update and a blue/green deployment on a containerized architecture?

Rolling update: ECS Blue/Green: CodeDeploy

In what programming language is the CDK's structure based on?

TypeScript

AWS Service Catalog templates are called ________

Products

What is best practice with a backend database when you wish to use blue/green deployments?

Make sure all database changes are backward compatible.

CodeDeploy accepts both Blue/Green deployments and In-place deployments. What are the differences between both of them?

-Blue/Green: Create parallele architecture and reroute to it -In-place: Substitute currently running instances with new ones

What Lambda feature must you use for Code Deploy to perform a Blue/Green deployment on AWS Lambda?

Traffic Shifting

What is Cloudformation Stack Sets?

It is a functionality that allows Organization accounts to deploy Cloudformation Stacks accross different accounts and regions

To enable automatic deploy of Cloudformation StackSets to different OU accounts you mus enable the ____________ feature

Automatic Deploy