Deployment @intercom

Talk about the cultural motivations/benefits of continuous deployment, and a little about the technical details of how we achieve zero-downtime deploys, dozens of times a day in ~10 minutes from master to production.

(some slides light in details, was awesome in real life though, honest ;)

Presented at the DevOps Ireland meetup on 2nd May 2013: http://www.meetup.com/DevOps-Ireland/

Transcript

1. Deployment @intercom
2. @darraghcurran Head of Product Engineering
3. Shipping at scale
4. Exceptional
5. Shipping has changed
6. Old way
7. New way Facebook shipping multiple times a day to billions of users
8. Shipping is a crucial step
9. Design -> Code -> Test -> Ship -> Win?
10. Shipping cadence defines your company
11. Individual and team behaviour change based on ease and frequency of shipping
12. Delay Behavior Seconds Continuous Shipping Immediate feedback loop Minutes Shift in focus delay in communication temptation to batch Hours costly process only if in the morning batch by necessity Days poor feedback loop only near the start of the week formal processes Weeks/Months apologetic months become quarters management get ‘busy’ fun--
13. e.g. Customer support
14. Benefits of faster shipping ⾭ Motivation ⾭ Morale ⾭ Momentum ⾭ Feedback ⾭ Learning ⾭ Hiring ⾭ Satisfaction
15. Progress trumps everything http://commons.wikimedia.org/wiki/File:Dan_Ariely_speaking_at_TED_in_2009.jpg
16. Intercom
17. 1000’s apps >25 million end users 20 people team Growing fast ++
18. How do we work?
19. Small features small increments cross functional team code review, automated tests tight feedback loops
20. What does deployed Intercom look like?
21. api.intercom.io www.intercom.io workers/cron aws region (ELB, AutoScaling, EC2) availability zone a availability zone b
22. ASG 㱺 Instances that can start themselves cloud-init each instance know’s what/how to start based on AutoScaling group
23. What happens during a deploy
24. 1. push to origin/master 2a. run tests 2b. create ‘slug’ 3. deploy
25. 3. deploy •update HEAD version pointer (s3) •trigger running instances to fetch/ run new version -touch tmp/restart.txt -Phusion Passenger enterprise
26. Concepts ★ Shipping cadence defines a company ★ Every second counts in a process ★ Ability to ship frequently, regardless of complexity ★ Zero: co-ordination, manual intervention, downtime for deploy ★ Improving | Getting worse 㱺 no fence
27. Questions? More details?