Brownfields DevOps in Practice

Brownfields DevOps in Practice slide deck from the Toronto Enterprise DevOps Meetup

Transcript

1. BROWNFIELDS DEVOPS IN PRACTICE
3. LaunchDarkly Raygun.io Octopus Deploy Facebook Instagram Shopify Etsy
4. @damovisa TWO ENDS OF THE SPECTRUM Startup Established Move fast, break stuff File | New Project Money to invest Get features out faster
5. Brownfields?
6. It’s ok.
7. LET’S TALK ABOUT “DEVOPS” Can I ignore this buzzword?
8. People and tools working together to get the right stuff in the hands of users faster
9. People and tools working together to get the right stuff in the hands of users faster
10. People and tools working together to get the right stuff in the hands of users faster
11. People and tools working together to get the right stuff in the hands of users faster
12. People and tools working together to get the right stuff in the hands of users faster
13. People and tools working together to get the right stuff in the hands of users faster
14. People and tools working together to get the right stuff in the hands of users faster
16. ESTABLISH A BASELINE Step 0
17. @damovisa ESTABLISH A BASELINE • How do you work? • How do you build? • How do you deploy? • How do you measure?
18. GET TO A GOOD STATE Agile, deployable software
19. One codebase
20. Isolate variations
21. @damovisa ISOLATE VARIATIONS public decimal GetWithSalesTax(decimal amount) { // Australia //return amount * 1.1; // New Zealand //return amount * 1.15; // UK return amount * 1.2; }
22. @damovisa ISOLATE VARIATIONS public decimal GetWithSalesTax(decimal amount) { switch (this.Country) { case Australia: return amount * 1.1; case New Zealand: return amount * 1.15; case UK: return amount * 1.2; } }
23. @damovisa ISOLATE VARIATIONS public class UkSalesTaxCalculator : ISalesTaxCalculator { public decimal GetWithSalesTax(decimal amount) { return amount * 1.2; } }
24. Externalize configuration
25. @damovisa ONE CODEBASE • Set configuration at deployment time • Read configuration at runtime • Choose an implementation at runtime <appSettings> <add key="Country" value="UK" /> </appSettings> <appSettings> <add key="Database" value="TestDB" /> </appSettings>
26. Build once, deploy many
27. @damovisa BUILD ONCE, DEPLOY MANY • The same bits everywhere • The same deployment process everywhere
28. Get your versioning right
29. @damovisa VERSIONING • Semver if you can… • Every build has a unique version • Newer code has a higher version • 1.0.0 à 1.0.1 • 20170120.1423 à 20170121.823
30. Measure in production
31. @damovisa GET TO A GOOD STATE • One codebase • Isolate variations • Externalize configuration • Build once, deploy many • Versioning • Measure Breaking up your code Ultimately into microservices
32. DEPLOY WITHOUT DRAMA Can you install?
33. Stateless deployments
34. @damovisa STATELESS DEPLOYMENTS App Version 1 App Version 1 Version 2 changes Version 3 changes App Version 2 App Version 3
35. Databases
36. @damovisa DATABASES • Migration scripts • DbUp • EF Migrations • Readyroll • Compare and apply • SqlCompare
37. Transitional Deployments
38. @damovisa TRANSITIONAL DEPLOYMENTS v1 v2 v3 v4 v1 v2 v3 v4
39. @damovisa TRANSITIONAL DEPLOYMENTS v1 v2 v3 v4 v1 v2 v3 v4
40. @damovisa TRANSITIONAL DEPLOYMENTS Id Name DateOfBirth 1 Lucy Oct 19 1976 2 Peter 24 January 1984 3 Richard Dec 10th, 1965 Id Name DateOfBirth DoB 1 Lucy Oct 19 1976 1976-10-19 2 Peter 24 January 1984 1981-01-24 3 Richard Dec 10th, 1965 1965-12-10 4 Beth Jan 5 1971 1971-01-05 Id Name DoB 1 Lucy 1976-10-19 2 Peter 1984-01-24 3 Richard 1965-12-10 4 Beth 1971-01-05 v1 v2 v3 Id Name DateOfBirth DoB 1 Lucy Oct 19 1976 1976-10-19 2 Peter 24 January 1984 1984-01-24 3 Richard Dec 10th, 1965 1965-12-10
41. @damovisa DEPLOY WITHOUT DRAMA • Stateless deployments • Migration scripts • Transitional deployments • Database compatibility one version back
42. IMPROVE YOUR CYCLE TIME How fast can you push a fix?
43. Automation
44. @damovisa AUTOMATION • Humans make mistakes • One thing at a time
45. Fix one bottleneck at a time
46. Build a pipeline
47. @damovisa BUILD A PIPELINE BUILD Does it merge? Does it compile? TEST Do our tests pass? PRODUCTION Hooray! DEPLOY + TEST Do the tests still pass? Does the UI work? Can we talk to our DB? Did our deployment work?
48. @damovisa BUILD A PIPELINE • Stop the bad stuff getting to production • “Prove this release candidate sucks” • A failure in pre-production is a win • Red-green-refactor your process
49. Feature flags
50. @damovisa FEATURE FLAGS • Wrap changes in flags • Configure externally • Deploy it turned off • Test in production! • Separate “Launch” from ”Deploy”
51. @damovisa IMPROVE CYCLE TIME • Automate deployments • Build a robust pipeline • Feature flags
52. CULTURE SHIFT How to help shift the mindset
53. No silos
54. “Task force”
55. Fix it for next time
56. @damovisa CULTURE • No silos • “Task force” • Fix it for next time
57. People and tools working together to get the right stuff in the hands of users faster
58. @damovisa BROWNFIELDS DEVOPS Why bother? Culture shift Establish a baseline Get to a good state Deploy without drama Improve cycle time
59. THANK YOU