Operating Rails in Kubernetes

My talk at RailsConf 2018.

Transcript

1. Operating Rails in Kubernetes Kir Shatrov
2. 1. Intro to Kubernetes 2. Rails in Kubernetes 3. Shopify’s migration story
3. Containers are awesome! *
4. Containerizing Rails: Techniques, Pitfalls, & Best Practices by Daniel Azuma Tomorrow 3:30pm
7. app01 app02 app03
8. app01 app02 app03
12. Smart container scheduling for better utilization
13. Smart container scheduling for better utilization
14. Smart container scheduling for better utilization
15. Kubernetes basics: Pod
16. Kubernetes basics: Deployment
17. web jobs Kubernetes basics: Deployment
20. web jobs Kubernetes basics: Deployment
21. web jobs Kubernetes basics: Deployment
22. web jobs Kubernetes basics: Deployment
23. Managing Resources
24. YAML
26. YAML apply when changed
27. YAML store in repository
29. Deploy process controlling servers
30. Deploy process sequentially applying commands by SSH
31. Capistrano sequentially applying commands by SSH
33. kubectl apply --file web.yml
34. kubectl apply --file jobs.yml
35. Controlling servers vs describing configuration
36. Controlling servers Describing configuration running commands remotely comparing output with expected not prone to failures push configuration poll for it to apply abstracts from physical machines self-healing
37. Controlling servers Describing configuration running commands remotely comparing output with expected not prone to failures push configuration poll for it to apply abstracts from physical machines self-healing
39. It's easy to run a container,
 but not Rails
40. The Twelve-Factor app
42. Disposability and termination
43. Web requests
44. Background Jobs
45. Long-running jobs
47. Abort and re-enqueue
48. Concurrency scale out via the process model
50. Assets
51. rake assets:precompile
52. Assets Shipped in container
53. Database Migrations
54. Migrations as a part of deploy
55. Migrations as a part of deploy
56. Asynchronous Migrations
57. 1. Change code and add a migration 1. Add a migration 2. Change code
58. 1. Change code and add a migration 1. Add a migration 2. Change code
59. Asynchronous Migrations
62. Secret Management
63. Secrets in the environment
64. Secrets in a container
65. Secrets in a container
66. Rails 5.2 Credentials
68. ENV[‘RAILS_MASTER_KEY’]
69. The Twelve Factors Let workers terminate gracefully Migrations as a part of deploy can be fragile Rails 5.2 Credentials + Kubernetes Secrets
70. Kubernetes at Shopify
72. Resource specs in YAML
76. kubectl apply --file web.yml
79. Let robots help humans to migrate apps Developers don’t have to write YAML configs kubernetes-deploy brings visibility into rollout progress
81. Kubernetes helps organizations to efficiently schedule workload and save resources It’s not magic, it only schedules and runs your containers Things you need to know about Rails
84. Thanks! @kirs @kirshatrov