AWS - Certified Developer - Associate 2020 > Section 14 - Devops > Flashcards

Section 14 - Devops Flashcards

(17 cards)

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1
Q

What is CI / CD?

A
  • Software development best practice
    • Continous integration, Continous delivery / Deployment
  • Make Small Changes & Automate Everything
    • Small, Incremental code changes, Automate as much as possible
    • e.g. code integration, build, test , deployment
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2
Q

AWS Developer Tools?

A
  • CodeCommit (Source & version Control)
    • Source control service enabling teams to collaborate on code.
  • CodeBuild (Automated Build)
    • Compiles source code, runs tests and produces packages that are ready to deploy.
  • CodeDeploy(Automated Deployment)
    • Automates code deployments to any instance, including EC2, Lambda and on-premises.
  • CodePipeline(Manages The workflow)
    • End-to-end solution, build,test, and deploy your application everytime there is code change.
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3
Q

What is CodeDeploy?

A
  • Automated Deployment
  • EC2 Instances, on-premises & Lambda
  • Quickly release new features
  • Avoid downtime during deployments
  • CodeDeploy Deployment Approaches
    • In-Place
      • The application is stopped on each instance and the new release is installed. Also known as a Rolling Update
      • Capacity is reduced during the deployment.
      • Lambda is not supported.
      • Rolling back invloves a re-deploy
      • Greate when deploying the first time.
    • Blue / Green​ (Safest Option)
      • ​New instances are provisioned and the new release is installed on the new instances.
      • Blue represents the active deployment,
      • Green is the new release.
      • No capacity reduction.
      • Green instances can de created ahead of time.
      • Easy to switch between old and new.
      • You pay for 2 environments until you terminate the old servers.
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4
Q

Example In-Place Deployment?

A
  • The application is stopped on the first instance.
  • The instance will be out of service during the deployment so capacity is reduced.
  • You should configure your Elastic Load balancer to stop sending requests to the instance.
  • CodeDeploy installs the new version, known as Revision.
  • The instance comes back into service.
  • How to Roll Back? You’ll need to re-deploy the previous version which can be time consuming.
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5
Q

Example Blue/Green Deployment?

A
  • Blue represents the current version of our application.
  • CodeDeploy provisions new instances. (Step 1)
  • The new Revision is deployed to the Green envrionment.(Step 2)
  • The Green instances are registered with the Elastic Load balancer. (Step 3)
  • Traffic is routed away from the old environment.(Step 4)
  • The Blue environment is evntually terminated (Step 5)
  • How do you rollback? Just set the Load balancer to direct the traffic back to the original environment.
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6
Q

CodeDeploy using the AppSpec File?

A
  • Configuration File
    • Defines the parameters to be used during a CodeDeploy deployment
  • EC2
    • For EC2 and on-premises systems, YAML Only.
  • Lambda
    • YAML and JSON supported. File structure depends on wheather you are deploying to Lambda or EC2.
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7
Q

EC2 AppSpec File Structure?

A

NB: The appspec.yml must be placed in the root of the directory of your Revision, otherwise the deployment will fail.

  • Version
    • Reserved for Future USE
    • Currently the allowed value is 0.0
  • OS
    • Operating system version
    • The operating system version you are using e.g Linux, Windows
  • Files
    • Configuration Files, packages
    • The location of any application files that need to be copied and where they should be copied to.
  • Hooks
    • Lifecycle event hooks
    • Scripts which need to run at set points in the deployment lifecycle.
    • Hooks have a very specific run order.
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8
Q

CodeDeploy Lifecycle Event Hooks?

A
  • Run Order
    • Lifecycle event hooks are run in a specific order known as the Run order.
  • In-Place Deployment
    • Broadly 3 Phases: de-register, installaing, re-registering with a Load Balancer
  • Logical Flow
    • For the exam you’ll need to understand the Logical Flow.
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9
Q

What is CodePipeline?

A

A fully managed CI/CD service.

  • Orchestrates Build,Test and Deployment
    • The pipeline is triggered every time there is change to your code.
    • a workflow must be defined for codepipeline
  • Automated Release Process
    • ​Fast, consistent, fewer mistakes. Enables quick release of new features and bug fixes
  • CodePipeline integrates with:
    • CodeCommit, CodeBuild, CodeDeploy, Github, Jenkins, Elastic Beanstalk, CloudFormation, Lambda, Elastic Container Service.
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10
Q

What is Elastic Container Service?

A
  • A container orchestration service which supports Docker and Windows Containers.
  • Quickly deploy and scale containerized workloads without having to install, configure, manage and scale your own orchestration platform.
  • Similar to Kubernetes, but with deep integration with AWS service e.g IAM, VPC, Route53
  • Running options for ECS:
    • Clusters of Virtual Machines
      • ECS will run your containers on clusters of virtual machine
    • Fargate for serverless
      • Use Fargate for serverless containers and you don’t need to worry about the underlying EC2 instances!
    • EC2 for More Control
      • If you want to control the installation, configuration and management of your compute environment
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11
Q

What is Elastic Container Registry (ECR)?

A
  • Amazon Elastic Container Registry (Amazon ECR) is a fully managed container registry that makes it easy to store, manage, share, and deploy your container images and artifacts anywhere.
  • Amazon ECR eliminates the need to operate your own container repositories or worry about scaling the underlying infrastructure
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12
Q

Docker & and CodeBuild Exam Tips?

A
  • Docker
    • docker build -t myexamplerepo .
    • docker tag myexamplerepo:latest 475745664.dkr.ecr.ue-centa-1.amazonaws.com ….:latest
    • docker push 475745664.dkr.ecr.ue-centa-1.amazonaws.com ….:latest
  • “​buildspec.yml” File
    • Use buildspec.yml to define the build commands and settings used by CodeBuild to tun your build.
  • Override “buildspec.yml” settings
    • You can override the settings in buildspec.yml by adding your own commands in the console when you launch the build.
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13
Q

Elastic Beanstalk & Docker Containers?

A
  • Elastic Beanstalk supports the deployment of Docker containers.
  • Docker containers are self-contained and include all the configuration information and software your web application requires to run.
  • Elastic Beanstalk handles the capacity provisioning, load balancing, scaling and application health monitoring.
  • Deployment options:
    • Single Docker Container
      • You can either run a single Docker container on an EC2 instance provisioned by Elastic Beanstalk
    • Multiple Docker Containers
      • Use Elastic Beanstalk to build an ECS cluster and deploy multiple Docker containers on each instance
    • Deploy Your Code
      • Upload a zip file containing your code and bundle Elastic Beanstalk will do the rest.
      • Code can be uploaded directly from your local machine or a public S3 bucket.
      • You can also store your code in CodeCommit - But must use the Elastic Beanstalk CLI.
    • Upgrade Your Code
      • If you want to upgrade your application to a new version, it’s one easy step in the console to upload and deploy.
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14
Q

What is CloudFormation?

A
  • Infrastructure As Code
    • Cloud formation allows you to manage , configure , and provision AWS infrastructure as YAML or JSON code.
  • Parameters
    • input custom values
  • Conditions
    • e.g. Provision resources based on environment
  • Resources
    • This section is manadory and describes the AWS resources that CloudFormation will create.
  • Mappings
    • Allows you to create custom mappings like Region: AMI
  • Transform
    • Allows you to reference code located in S3, e.g. Lambda code or resuable snippets of CloudFormation code.
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15
Q

Serverless Application Model (SAM) ?

A
  • Define and provision serverless applications using CloudFormation
  • “sam package”
    • Packages your application and uploads to S3
  • “sam deploy”
    • Deploys your serverless app using CloudFormation
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16
Q

CloudFormation Nested Stacks?

Study These Flashcards
A
  • CloudFormation nested stacks enable re-use of CloudFormation Code for common use cases. e.g. Standard configuration for a load balancer, web server or application server.
  • Instead of copying out the code each time, create a standard template for each common use case and reference from withon your CloudFormation template.
  • CloudFormation Template reference:
    • Resource
      • Type: AWS::CloudFormation::Stack
    • Template must be hosted on S3
  • You can have multi level stacks …but only one level is recommended
AWS - Certified Developer - Associate 2020
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