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CI_and_CD.md

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CI/CD

CI - Continuous Integration

  • code commit each day

CD - Continuous Delivery

  • automatically build/test
  • release is a manual decision

CD - Continuous Deployment

  • automatically released to environments
  • fully automated

CodeCommit

  • code respository
  • private git repo

CodeBuild

  • fully managed build services

CodeDeploy

  • deploy build artifacts
  • deploy to EC2, on prem or Lambda functions
  • use with CI/CD tools: Jenkins, GitHub, Altassian, AWS Code Pipeline
  • use with: Ansible, Puppet, Chef
  • two types of approaches
    • in place or rolling update
      • not supported on lambda
      • roll back by deploying old version
    • blue/green
      • create duplicate instances with new version
      • load balancer sends requests to new instances
      • remove old instances
      • no reduction is capacity or performance
  • deployment terms
    • deployment group: set of EC2/Lambda functions
    • deployment: process and components used to apply new revision
    • deployment configuration: set of rules for the deployment as well as success/failure conditions
    • AppSpec File: defines actions code deploy should do
    • Revisions: everything for a deployment
    • Application: id for application you are deploying

CodePipeline

  • orchestrate build/test/deploy

AppSpec

Lambda

  • written in YAML or JSON
  • fields
    • version: always "0.0"
    • resources: name and properties of the Lambda function
    • hooks: Lambda functions to run at set points in the deployment
      • BeforeAllowTraffic
      • AfterAllowTraffic

EC2 and On Premises

  • written in YAML only
  • must be root of distribution folder
  • example distribution folder layout: 
      /appspec.yml
  /scripts/
  /config/
  /src/
  • fields
    • version: "0.0"
    • os: OS version
    • files: location of application files, source and destination
    • permissions: set file permission, only on linux
    • hooks: event hooks
  • example file 
    version: 0.0
os: linux
files:
  - source: config/config.txt
    destination: /webapps/config
  - source: source
    destination: /webapps/mywebapp
hooks:
  BeforeInstall:
    -location: scripts/unzip-resource.sh
    -location: scripts/unzip-data.sh
  AfterInstall:
    -location: scripts/run-tests.sh
      timeout: 180
  ApplicationStart:
    - location: scripts/run-functional-tests.sh
      timeout: 3600
  ValidateService:
    - location: scripts/monitor-service.sh
      timeout: 3600
      runas: codedeployuser
  • order of event hooks
    • Stop Traffic
      • BeforeBlockTraffic
      • BlockTraffic
      • AfterBlockTraffice
    • Install
      • ApplicationStop
      • DownloadBundle
      • BeforeInstall
      • Install
      • AfterInstall
      • ApplicationStart
      • ValidateService
    • Start Traffic
      • BeforeAllowTraffic
      • AllowTraffic
      • AfterAllowTraffic

Docker

  • know how to build, tag and push images
    • docker build -t {name}
    •