How to create the (almost) smallest possible container — … for an OTP release — … of an Elixir application!

Presentation (without speaker notes, sorry) about how to build a pretty small docker image/container for Elixir applications based on OTP releases (kudos to exrm project!).

https://github.com/asaaki/elixir-docker-image-packager

Transcript

1. How to create the (almost) smallest possible container 1
2. … for an OTP release 2
3. … of an Elixir application! 3
4. Docker? 4
5. Containerization of applications 5
6. Much simpler than VMs 6
7. Building blocks already existing for years 7
8. Process and resource isolation 8
9. Benefits 9
10. better dependency handling 10
11. easier distribution 11
12. easier scalability 12
13. no snowflakes 13
14. predictable environment 14
15. Blazingly fast! 15
16. If you follow some principles 16
17. Immutability 17
18. Separation of application and state 18
19. Use Cases 19
20. Development setup 20
21. Continuous Integration 21
22. Production 22
23. OTP release? 23
24. Bundle of Erlang applications 24
25. + runtime (ERTS) 25
26. Precompiled (no bare source code) 26
27. + some system dependencies 27
28. Build env must match target system 28
29. exrm 29
30. 12factor.net 30
31. docker: ✔ 31
32. OTP: ✘ 32
33. Recommendations 33
34. Keep config small 34
35. Only non-runtime related configs 35
36. Config Distribution and Service Discovery 36
37. What else? 37
38. No hot code reloading! 38
39. Your containers are immutable! 39
40. Not always bad 40
41. DB Migrations 41 Sorry!
42. And now? 42
43. Plenty of Elixir images on Docker Hub 43
44. But issues they have 44
45. ubuntu based 45
46. some: alpine 46
47. your sources 47
48. Wouldn't it be nice to just build an image only from your release? 48
49. EDIP 49 Elixir Docker Image Packager
50. Docker image + mix task 50
51. Docker image: builds project 51
52. Docker image: collects system dependencies 52
53. Docker image: creates tarball 53
54. Tarball artifact ‑ docker image 54
55. cat <tarball file> | \ docker import - <image name> 55
56. mix edip 56
57. Build system needs: docker + Elixir 57
58. Future plans 58
59. Refactoring 59
60. Umbrella projects 60
61. More build configuration 61
62. CI service support ✘✔✘✘ 62 https://github.com/asaaki/edip-app-test-ci
63. Standalone executable? 63
64. Try. Have fun. Build stuff. 64
65. Thank you! ! 65
66. Christoph Grabo twitter.com/asaaki github.com/asaaki 66