CI / CD @

About me

• Software engineer
• @g_scheibel / @ExpediaEng / @ExpediaEng_Lon
• http://gscheibel.net / https://techblog.expedia.com
• and so on …​

https://gscheibel.github.io/cicd-expedia/

Conclusion

• Build
• Measure
• Learn
• Loop

Confidence is key

4 rules of simple design

• 1. Passes all the tests
  2. Express every idea we need to express
  3. Contains no duplication.
  4. Minimized moving parts.

Testing strategy

A good test tests, a bad test tests

• class FlightService {
  
    void Flight get(String flightNumber) {
  
      return expHttpClient
              .get("https://externalService/flight/"+flightNumber)
              .as(Flight.class);
    }
  }

From Pull request to Production

Automatisation is crucial

Build It Simple, Stupid

Adding a new feature

• Pull request Pull request build
• Simple, Stupid mvn clean install

Build It Simple, Stupid

Only Production really matters

Done means in deployed production

In Production != Taking traffic

• if(config.isEnabled()){
  
    newWay();
  
  } else {
  
    currentWay();
  
  }

Measure everything

CPU and memory are not the only metrics

Logging

"This is not a log"

datetime="18/04/2017 14:25:00T000"
eventCode=42
eventName="DID_SOMETHING"
version="e2b126a9"
prop1="value1"
prop2="value2"

Remember Murphy’s law

Don’t rush

How do I know I’m on the right path?

Conclusion

• Build
• Measure
• Learn
• Loop