Continuous Integration

Steve Desmond

Ithaca Web People

August 2, 2016

No One Agrees How to Define CI or CD

"It appears that the use of a CI server or tool is fairly synonymous with doing CI."

x

What is Continuous Integration?

A Set of Practices

• Everyone Commits To the Mainline Every Day
• Every Commit Should Build the Mainline on an Integration Machine
• Maintain a Single Source Repository
• Automate the Build
• Make Your Build Self-Testing
• Fix Broken Builds Immediately
• Keep the Build Fast
• Test in a Clone of the Production Environment
• Make it Easy for Anyone to Get the Latest Executable
• Everyone can see what's happening
• Automate Deployment

Why?

Why Do CI?

• Quality
• Stability
• Visibility

Always-releasable software

How?

Automate the Build

(and Make Your Build Self-Testing)

1. Checkout Code
2. Build Application
3. Run Tests

						
#!/bin/bash
git clone git@github.com:user/repo
npm install
npm test
						
					

						
#!/bin/bash
git clone git@github.com:user/repo
composer install
phpunit
						
					

Every Commit
Should Build the Mainline
on an Integration Machine

• cron job
• server daemon
• post-commit hooks

Continuous Integration Tools

CI Tools Cover:

• Automate the Build
• Make Your Build Self-Testing
• Every Commit Should Build the Mainline on an Integration Machine
• Make it Easy for Anyone to Get the Latest Executable
• Everyone can see what's happening

Travis CI

SaaS web app

GitHub integration

convention over configuration

demo time

What about the others?

• Everyone Commits To the Mainline Every Day
• Fix Broken Builds Immediately
• Keep the Build Fast

The Bigger Picture

• Continuous Integration
  1. Checkout Code
  2. Build Application
  3. Run Unit Tests
  4. Deploy to Test Env
  5. Run Acceptance Tests






• Continuous Delivery
  6. Deploy to Staging
  7. Moar Tests!
  8. Push-Button to Prod



• Continuous Deployment
  8. Automatic to Prod
     (YOLO)

Who does CD?

Etsy: ~50x/day

Facebook: ~200x/day

Amazon: ~1000x/day

Resources

This presentation
https://github.com/stevedesmond-ca/presentations/tree/iwp-ci

Example project
https://github.com/stevedesmond-ca/travis-example-node

Travis CI
https://travis-ci.org

Steve Desmond

https://stevedesmond.ca

stevedesmond-ca

stevedesmond_ca

hi@stevedesmond.ca