Continuous-Delivery-Meetup-NYC-2013.pdf

How we tackle deployments and keep them fast at Etsy.

Reprised version with some additions for the Continuous Delivery NYC meetup October 2013.

Transcript

1. Scaling Deployment at Etsy Daniel Schauenberg dschauenberg@etsy.com @mrtazz Thursday, October 10, 13
2. Thursday, October 10, 13
3. August 2013 •1.8 billion page views •5,483,399 items sold •$109.1 million of goods sold •> 30 million members •> 1 million active shops http://www.etsy.com/blog/news/2013/etsy-statistics-august-2013-weather-report/ | Items by RockerDollJewellery, ZulamimiLand, codice, 42Things Thursday, October 10, 13
4. LAMMP Item by TheBackPackShoppe Thursday, October 10, 13
5. Item by FrankelPhotos Monolithic App Thursday, October 10, 13
6. No Branching Item by NurseryWallArt Thursday, October 10, 13
7. Deploy Frequency Thursday, October 10, 13
8. First Day Item by flowersandfleurons Thursday, October 10, 13
9. Thursday, October 10, 13
10. IRC Thursday, October 10, 13
11. Thursday, October 10, 13
12. Developer VMs •KVM •Dev version of full Etsy stack •Chef •DevTools Thursday, October 10, 13
13. Thursday, October 10, 13
14. Item by codecards Thursday, October 10, 13
15. % review -r dschauenberg Thursday, October 10, 13
16. automatically assigned automatically assigned Thursday, October 10, 13
17. Try Item by CSSDesign Thursday, October 10, 13
18. Actually ... Thursday, October 10, 13
19. The Bobs Item by Signz Thursday, October 10, 13
20. The Bobs •LXC containers on buildtests •Multiple SSDs •Labels for heavy/any execution •One heavy executor per disk Thursday, October 10, 13
21. CI/Try •~260 Bobs •Mostly for try •Constant monitoring for slow tests Thursday, October 10, 13
22. push train Item by decomodwalls Thursday, October 10, 13
23. #push •IRC channel to organize push trains •Join a train if you want to deploy changes •Schedule is planned via the channel topic •First in the train is the driver (controls the deploy) •Opening hours: 7am - 10pm NYC time Thursday, October 10, 13
24. #push <prod> kseever* + jameslee | jpaul | DanielConvissor (c) Thursday, October 10, 13
25. #push bateman* + krunal* + enorris* | tristan (c) + jameslee (c) + jlaster (c) | dawa + corey + sandosh + jklein + magera + seth_home + mpascual + nathan | bateman | russp (c) Thursday, October 10, 13
26. pushbot •.join •.in •.good •.done Thursday, October 10, 13
27. pushbot Thursday, October 10, 13
28. Item by EsalonPhotography Thursday, October 10, 13
29. Deployinator Thursday, October 10, 13
30. Thursday, October 10, 13
31. Thursday, October 10, 13
32. stale commits Thursday, October 10, 13
33. version checks buttons disabled buttons disabled Thursday, October 10, 13
34. version checks Thursday, October 10, 13
35. lock down deploys Thursday, October 10, 13
36. https://github.com/etsy/deployinator Thursday, October 10, 13
37. Downsides •Deploys not atomic on the request level •Limbo during the time of the local rsync •Common strategy was to split commits into 3 deploys Thursday, October 10, 13
38. Item by Geographicsart Thursday, October 10, 13
39. Atomic Deploys Thursday, October 10, 13
40. Basic Idea Yin Yang Active Docroot Thursday, October 10, 13
41. Basic Idea Yin Yang Active Docroot rsync Thursday, October 10, 13
42. Basic Idea Yin Yang Active Docroot Thursday, October 10, 13
43. Basic Idea Yin Yang Active Docroot Thursday, October 10, 13
44. Problems •Symlink swap during requests •Code needs to be guaranteed to finish on the docroot it started •Code inclusion mid request Thursday, October 10, 13
45. etsy/mod_realdoc •Apache post_read_request hook •Whole request works on realpath of docroot •Caches realpath for 2s Thursday, October 10, 13
46. ini_set('include_path', $_SERVER['DOCUMENT_ROOT'].'/../include'); Thursday, October 10, 13
47. etsy/incpath •PHP module to set the incpath •Gets docroot from Apache or realpath() itself •Looks for a pattern to replace in include_path •Restores include_path at the end of the request Thursday, October 10, 13
48. What did we get? •Remove functions and call site in same deploy •No restarts necessary •Opcode caches stay warm for files that don’t change between 2 deploys Thursday, October 10, 13
49. Things to watch out for •Code that uses full path names to scripts •Atomic symlink swapping with `mv -T` •Realpath caching to not stress the filesystem •Opcode cache needs to fit 2x code size •Only request atomicity Thursday, October 10, 13
50. The Plateau Item by finandfancy Thursday, October 10, 13
51. The Plateau •Regular deploys took ~15 mins •Config deploys about half •10am - 6pm => ~ 32 deploys •Long waiting times Thursday, October 10, 13
52. Item by KlaireWarren Thursday, October 10, 13
53. Waiting for push queue Waiting for push queue Thursday, October 10, 13
54. Split The Queues Item by KlaireWarren Thursday, October 10, 13
55. HELLO SPLIT QUEUES HELLO SPLIT QUEUES Thursday, October 10, 13
56. Dashboards deploy lines deploy lines Thursday, October 10, 13
57. Supergrep Thursday, October 10, 13
58. Thursday, October 10, 13
59. Summary •Current setup has scaled to ~150 people •Constantly trying to improve the speed of deployment •Find weak parts in the process and make them more robust/faster •Bring Dev closer to Prod •Not being able to deploy has the same status as the site being down Thursday, October 10, 13
60. codeascraft.etsy.com www.etsy.com/codeascraft/talks etsy.github.com www.etsy.com/careers Thursday, October 10, 13
61. Questions? Thursday, October 10, 13
62. Scaling Deployment at Etsy Daniel Schauenberg dschauenberg@etsy.com @mrtazz Thursday, October 10, 13