Write Kubernetes CustomController in Go

1. Write Kubernetes CustomController in Go golang.tokyo #28 Dec.4
3. OVERVIEW golang.tokyo #28 Dec.4 ɾk8sͷ༻ޠͷ͓͞Β͍ ɾcontroller-runtimeΛ࢖࣮ͬͨ૷ ɾk8sͷControllerͱ͸ʁ
4. k8sͷ͓͞Β͍ ɾPod : ϫʔΫϩʔυͷ࠷খ୯Ґ ex. Goίϯςφ(API) + fluentdίϯςφ(logging) ɾReplicaSet : ͋ΔPodͷू߹
5. k8sͷControllerͱ͸ʁ k8s͸Manifest(yaml)Ͱ๬·͍͠ঢ়ଶΛએݴ => ͦͷঢ়ଶΛҡ࣋͠ଓ͚Δ ref) Operator Basic in CNDK2019 - speakerdeck
6. k8sͷControllerͱ͸ʁ
7. k8sͷControllerͱ͸ʁ
8. k8sͷControllerͱ͸ʁ
9. k8sͷControllerͱ͸ʁ k8s͸಺෦Ͱ͜ͷॲཧΛ
 ܁Γฦ͍ͯ͠Δ => ͋Δ΂͖ঢ়ଶͱ
 ɹ ݱࡏͷঢ়ଶΛ߹ΘͤΔ
10. CustomController controller͸ࣗલͰ࡞Δ͜ͱ΋Ͱ͖Δ => ͦΕ͕CustomController kubernetes-sigs/controller-runtime ͱ͍͏ϥΠϒϥϦ͕ఏڙ͞Ε͍ͯΔ
11. controller-runtimeΛ ࢖࣮ͬͨ૷ ࠓճͷαϯϓϧɿ ReplicaSet͕࡞੒͞ΕͨΒɺ ͦͷ؅ཧԼͷίϯςφ໊Λදࣔ͢Δ ίϯτϩʔϥʔ
12. controller-runtimeΛ ࢖࣮ͬͨ૷ (controller.go) ͲͷϦιʔεΛऔಘͯ͠ɺͲ͏͍͏ॲཧΛ࣮ߦ͢Δ͔ ɾ Reconciler ɾ
13. controller-runtimeΛ ࢖࣮ͬͨ૷ (controller.go) Namespace, Ϧιʔε(ReplicaSet)Λࢦఆͯ͠ɺ Ϧιʔεͷ৘ใΛऔಘɺίϯςφ໊Λग़ྗ ɾ
14. controller-runtimeΛ ࢖࣮ͬͨ૷ (main.go) ControllerΛੜ੒ ɾ ઌ΄Ͳఆٛͨ͠ReconcilerΛࢦఆ ɾ
15. controller-runtimeΛ ࢖࣮ͬͨ૷ (main.go) ɾࢦఆͨ͠ϦιʔεΛControllerͰ؂ࢹ ɾ ɾReplicaSetʹߋ৽͕͋ͬͨΒɺઌ΄ͲͷॲཧΛ࣮ߦ
16. controller-runtimeΛ ࢖࣮ͬͨ૷ ReplicaSetΛ࡞੒ͨ͠Βɺ ͦͷ؅ཧԼͷίϯςφͷ໊લ͕ දࣔ͞Εͨ 70ߦ͘Β͍Ͱ؆୯ʹॻ͚ͨ
17. ࣮༻తͳControllerΛ࡞͍͖͍ͬͯͨ
18. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ