Write Kubernetes CustomController in Go

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Write Kubernetes CustomController in Go golang.tokyo #28 Dec.4

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OVERVIEW golang.tokyo #28 Dec.4 ɾk8sͷ༻ޠͷ͓͞Β͍ ɾcontroller-runtimeΛ࢖࣮ͬͨ૷ ɾk8sͷControllerͱ͸ʁ

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k8sͷ͓͞Β͍ ɾPod : ϫʔΫϩʔυͷ࠷খ୯Ґ ex. Goίϯςφ(API) + fluentdίϯςφ(logging) ɾReplicaSet : ͋ΔPodͷू߹

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k8sͷControllerͱ͸ʁ k8s͸Manifest(yaml)Ͱ๬·͍͠ঢ়ଶΛએݴ => ͦͷঢ়ଶΛҡ࣋͠ଓ͚Δ ref) Operator Basic in CNDK2019 - speakerdeck

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k8sͷControllerͱ͸ʁ

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k8sͷControllerͱ͸ʁ

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k8sͷControllerͱ͸ʁ

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k8sͷControllerͱ͸ʁ k8s͸಺෦Ͱ͜ͷॲཧΛ  ܁Γฦ͍ͯ͠Δ => ͋Δ΂͖ঢ়ଶͱ  ɹ ݱࡏͷঢ়ଶΛ߹ΘͤΔ

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CustomController controller͸ࣗલͰ࡞Δ͜ͱ΋Ͱ͖Δ => ͦΕ͕CustomController kubernetes-sigs/controller-runtime ͱ͍͏ϥΠϒϥϦ͕ఏڙ͞Ε͍ͯΔ

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controller-runtimeΛ ࢖࣮ͬͨ૷ ࠓճͷαϯϓϧɿ ReplicaSet͕࡞੒͞ΕͨΒɺ ͦͷ؅ཧԼͷίϯςφ໊Λදࣔ͢Δ ίϯτϩʔϥʔ

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controller-runtimeΛ ࢖࣮ͬͨ૷ (controller.go) ͲͷϦιʔεΛऔಘͯ͠ɺͲ͏͍͏ॲཧΛ࣮ߦ͢Δ͔ ɾ Reconciler ɾ

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controller-runtimeΛ ࢖࣮ͬͨ૷ (controller.go) Namespace, Ϧιʔε(ReplicaSet)Λࢦఆͯ͠ɺ Ϧιʔεͷ৘ใΛऔಘɺίϯςφ໊Λग़ྗ ɾ

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controller-runtimeΛ ࢖࣮ͬͨ૷ (main.go) ControllerΛੜ੒ ɾ ઌ΄Ͳఆٛͨ͠ReconcilerΛࢦఆ ɾ

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controller-runtimeΛ ࢖࣮ͬͨ૷ (main.go) ɾࢦఆͨ͠ϦιʔεΛControllerͰ؂ࢹ ɾ ɾReplicaSetʹߋ৽͕͋ͬͨΒɺઌ΄ͲͷॲཧΛ࣮ߦ

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controller-runtimeΛ ࢖࣮ͬͨ૷ ReplicaSetΛ࡞੒ͨ͠Βɺ ͦͷ؅ཧԼͷίϯςφͷ໊લ͕ දࣔ͞Εͨ 70ߦ͘Β͍Ͱ؆୯ʹॻ͚ͨ

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