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Write Container Runtime in Go

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October 28, 2019
Programming
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Write Container Runtime in Go

Presented in Go Conference 2019 Autumn

https://gocon.jp/sessions/write_container_runtime_in_go/

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tomocy

October 28, 2019
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Transcript

  1. Write Container Runtime in Go Go Conference 2019 Autumn Koki

    Tomoshige (@towocy)

  2. Write Container Runtime in Go

  3. Write Container Runtime in Go

  4. ίϯςφϥϯλΠϜʹ͍ͭͯ

  5. ίϯςφٕज़ ίϯςφϥϯλΠϜͱ ίϯςφΠϝʔδ

  6. ίϯςφϥϯλΠϜ OCI runtimeʹ४ڌ͍ͯ͠Δ

  7. OCIʢOpen Container Initiativeʣ ίϯςφٕज़ͷඪ४ن֨Λ ࡞੒͢ΔͨΊͷஂମ

  8. None

  9. runtime.me ίϯςφϥϯλΠϜͱͯ͠ͷ ঢ়ଶͱৼΔ෣͍ https://github.com/opencontainers/runtime-spec/blob/master/runtime.md

  10. Query State state <container-id> Create create <container-id> <path-to-bundle> Start start

    <container-id> Kill kill <container-id> <signal> Delete delete <container-id>
  11. None

  12. Standard Go Project Layout /cmd https://github.com/golang-standards/project-layout#cmd

  13. None

  14. CLI pkg github.com/urfave/cli

  15. None
  16. None
  17. None
  18. None
  19. None

  20. InterfaceͰͷந৅Խ ࢖༻ऀଆ͕ ٻΊΔৼΔ෣͍Λఆٛ͢Δ https://github.com/golang/go/wiki/CodeReviewComments#interfaces

  21. None

  22. ίϯςφϥϯλΠϜͷ࣮૷ʹ͍ͭͯ

  23. ίϯςφϥϯλΠϜ ϗετOS্ͷ Ϧιʔεִ͕཭ɺ੍ݶ͞Εͨϓϩηε

  24. ‘Contain’er ʙΛด͡ࠐΊΔ

  25. ίϯςφϥϯλΠϜ How to contain a process

  26. https://employment.en-japan.com/engineerhub/entry/2019/02/05/103000#ίϯςφͱ͸ ΧʔωϧϦιʔεɺϑΝΠϧγεςϜͷִ཭ Namespaceɺchroot/pivot_root ϋʔυ΢ΣΞϦιʔεͷ੍ݶ cgroup ݖݶͷ੍໿ Capabilityɺseccomp

  27. None

  28. Fork

  29. Fork ਌ϓϩηε ࢠϓϩηε

  30. Fork ਌ϓϩηε ࢠϓϩηε Contain

  31. None

  32. Build Constraints ϑΝΠϧ໊Ͱ Ϗϧυର৅Λ෼͚Δ https://golang.org/pkg/go/build/#hdr-Build_Constraints

  33. None
  34. None
  35. None
  36. None

  37. Fork ਌ϓϩηε ࢠϓϩηε Contain

  38. https://github.com/rrreeeyyy/container-internship/tree/master/02#linux-namespaces IPC ϓϩηεؒ௨৴Ͱ࢖͏Ϧιʔε Network ωοτϫʔΫσόΠεɺϧʔςΟϯάςʔϒϧ Mount ϑΝΠϧγεςϜπϦʔ PID ϓϩηε ID

    User Ϣʔβ IDɺάϧʔϓ ID UTS nodenameɺdomainname
  39. None

  40. Fork

  41. None

  42. Filesystem bundle config.jsonͱrootfs https://github.com/opencontainers/runtime-spec/blob/master/bundle.md

  43. ࢠϓϩηεͷϧʔτ༻ʹ

  44. ࢠϓϩηεͷϧʔτ༻ʹ mount͍ͯ͘͠

  45. ࢠϓϩηεͷϧʔτ༻ʹ mount͍͖ͯ͠ ͦͯ͠pivot_root͢Δ

  46. ࢠϓϩηεʹ͸ / ʹݟ͑Δ

  47. cgroup ϓϩηεʹରͯ͠ ڞ௨ͷϦιʔε؅ཧΛ͢Δ https://gihyo.jp/admin/serial/01/linux_containers/0003

  48. None
  49. None
  50. None
  51. None
  52. None
  53. None
  54. None
  55. None
  56. None
  57. None
  58. None
  59. None

  60. Write Container Runtime in Go

  61. ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ

  62. https://github.com/opencontainers/runtime-spec/blob/master/runtime.md https://github.com/opencontainers/runtime-spec/blob/master/bundle.md https://github.com/golang-standards/project-layout#cmd https://github.com/golang/go/wiki/CodeReviewComments#interfaces https://employment.en-japan.com/engineerhub/entry/2019/02/05/103000#ίϯςφͱ͸ https://golang.org/pkg/go/build/#hdr-Build_Constraints https://github.com/rrreeeyyy/container-internship/tree/master/02#linux-namespaces https://employment.en-japan.com/engineerhub/entry/2019/02/05/103000 https://github.com/tomocy/gocon ࢀߟจݙ

    https://speakerdeck.com/kyohmizu/windowskontenaru-men?slide=26 https://speakerdeck.com/tenforward/cndt2019 https://sil.hatenablog.com/entry/why-container-is-secure