Millions of Apps Deployed

Heroku has deployed over a million applications in most web languages and frameworks, see what we've learned in the process!

1. 2013 Richard Schneeman @schneems Millions of Apps
2. Hello
3. @schneems
4. Schnauser
6. Ruby Me
7. Hans Peter Von Wolfe (the 5th)
8. Sextant Gem
9. Wicked ‘ ‘ Gem
10. Triage Code codetriage.com
12. Adjunct Professor
13. Good News Everyone! schneems.com/ut-rails
15. Ruby Task Force
16. Ruby Task Force Member
17. What did we learn?
18. Twelve Factor • Can apply to any language • Speeds up deployment, makes scaling easier & keeps apps clean • Developed over direct exposure to the deployment of hundreds of thousands of apps
19. 12factor.net • Codebase • One codebase tracked in revision control, many deploys • Dependencies • Explicitly declare and isolate dependencies • Config • Store config in the environment • Backing Services • Treat backing services as attached resources
20. 12factor.net • Build, Release, Run • Strictly separate build and run stages • Process • Execute the app as one or more stateless processes • Port Binding • Export services via port binding • Concurrency • Scale out via the process model
21. 12factor.net • Disposability • Maximize robustness with fast startup and graceful shutdown • Dev/Prod Parity • Keep development, staging, and production as similar as possible • Logs • Treat logs as event streams • Admin Process • Run admin/management tasks as one-off processes
22. Questions? @schneems
23. Rails Gets A lot right
24. Skip the numbers, focus on the takeaways
25. Close your Laptops
26. Unless you’re commenting on rails/rails issues
27. Security Security Security
28. CSRF
29. Cross Site Request Forgery
31. config.security_token
32. the key to your digital kingdom
33. Would you give your Car key copies to:
34. Interns? Your
35. Contractors? Your
36. Your Open Source Contributors?
37. If secrets are in your source, you’ve already given them your digital kingdom
38. Protect Your Code
39. Secure keys in source control aren’t secure
40. What’s an alternative?
41. Environment Variables
42. $ rake db:migrate RAILS_ENV=test
43. $ rake db:migrate RAILS_ENV=test
44. In Development
45. Use a .env file
46. $ cat .env SECRET_TOKEN=d59c2a439f
47. Use dotenv gem
48. $ irb > Dotenv.load > puts ENV[‘SECRET_TOKEN’] > “d59c2a439f”
49. Use foreman gem
50. $ foreman run irb > puts ENV[‘SECRET_TOKEN’] > “d59c2a439f”
51. In Production
52. $ heroku config:add SECRET_TOKEN=d59c2a439
53. VPS • Use Foreman/Dotenv • Add to bashrc • Add values directly to command $ SECRET_TOKEN=asd123 rails console ruby-1.9.3> puts ENV[‘SECRET_TOKEN’] ruby-1.9.3> “asd123”
54. What if...
55. Someone Can read my ENV Variables?
56. Then they can read your files too
57. Is your app secure?
58. Is your app open source- able?
59. SECRET_TOKEN is just one example of Config
60. Define: Config
61. Config • What varies between deploys • resource strings to databases • credentials to S3, twitter, facebook, etc. • canonical values, hostname • security tokens
62. Can you deploy your app to change your S3 Bucket?
63. Do you NEED to deploy your app to change your S3 bucket?
64. Don’t Do This
65. Environment Variables! Use
66. Config
67. The interface between your platform and your code
68. But I like storing my credentials in git!
69. What is Config? Just because it works...
70. Keep Config Seperate from Code
71. Gives us Release Managment
72. $ heroku releases === issuetriage Releases v102 Add SECRET_TOKEN config v101 Deploy 0e66245
73. $ heroku releases:rollback V101
74. Keep Config Seperate from Code
75. Gives us Add-ons
77. $ heroku addons:add cdn_sumo
78. config/production.rb config.action_controller.asset_host = ENV["CDN_SUMO_URL"]
80. We’re treating add-ons as attached resources
81. development vs. production
82. Using Postgres in Production?
83. You wouldn’t develop in mongo
84. Don’t develop on sqlite3 and deploy on Postgres
85. Dev/Prod Parity
86. Development • As close to production as possible • Same data-stores (postgres, memcache) • Same language versions (Ruby 1.9) • Real/consistent data
87. Development • Real/consistent data $ heroku pgbackups:capture
88. Dev/Dev Parity
89. README.md • Living document • Standardize dev environment • Instructions for external dependencies • Instructions for starting processes • Problem with dev environment? • Put the fix in the readme $ brew install memcache $ foreman start
90. Use a Readme to scale your Devs
91. This is my README There are many like it, but this one is MINE
92. You could use a script...
93. Do you have performance problems?
94. WRONG!
95. there are no performance problems, only visibility problems “ - Ryan.Smith
96. Application Visability
97. What we need:
98. Distributed
99. Fault Tolerant
100. Low Overhead
101. Streams of data
102. Solution:
106. ????????
107. ????????
108. Introducing
109. logs
110. As streams of data
111. Measure Metrics:
113. Track Errors:
114. $ heroku logs --tail
115. What about when i’m not looking?
116. Papertrail
118. Error Notification
119. Error Notification • Record Logs & Errors • New Relic (rpm) • Airbrake (hoptoad) • HoneyBadger
120. New Relic
121. Protip: Admin flavored error pages
122. Error Pages • Admins get error + Backtrace Couldn't find Course with ID=chunkybacon Details Params: {"action"=>"show", "controller"=>"courses", "id"=>"chunkybacon"} Backtrace: lib/active_record/relation/finder_methods.rb:304:in `find_one'
123. Admin Error Pages + Backtrace Couldn't find Course with ID=chunkybacon Details Params: {"action"=>"show", "controller"=>"courses", "id"=>"chunkybacon"} Backtrace: lib/active_record/relation/finder_methods.rb:304:in `find_one'
124. Questions? @schneems (for real this time)