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Write Kubernetes CustomController in Go
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moricho
December 04, 2019
Programming
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Write Kubernetes CustomController in Go
moricho
December 04, 2019
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Transcript
Write Kubernetes CustomController in Go golang.tokyo #28 Dec.4
None
OVERVIEW golang.tokyo #28 Dec.4 ɾk8sͷ༻ޠͷ͓͞Β͍ ɾcontroller-runtimeΛ࣮ͬͨ ɾk8sͷControllerͱʁ
k8sͷ͓͞Β͍ ɾPod : ϫʔΫϩʔυͷ࠷খ୯Ґ ex. Goίϯςφ(API) + fluentdίϯςφ(logging) ɾReplicaSet :
͋ΔPodͷू߹
k8sͷControllerͱʁ k8sManifest(yaml)Ͱ·͍͠ঢ়ଶΛએݴ => ͦͷঢ়ଶΛҡ࣋͠ଓ͚Δ ref) Operator Basic in CNDK2019 -
speakerdeck
k8sͷControllerͱʁ
k8sͷControllerͱʁ
k8sͷControllerͱʁ
k8sͷControllerͱʁ k8s෦Ͱ͜ͷॲཧΛ ܁Γฦ͍ͯ͠Δ => ͋Δ͖ঢ়ଶͱ ɹ ݱࡏͷঢ়ଶΛ߹ΘͤΔ
CustomController controllerࣗલͰ࡞Δ͜ͱͰ͖Δ => ͦΕ͕CustomController kubernetes-sigs/controller-runtime ͱ͍͏ϥΠϒϥϦ͕ఏڙ͞Ε͍ͯΔ
controller-runtimeΛ ࣮ͬͨ ࠓճͷαϯϓϧɿ ReplicaSet͕࡞͞ΕͨΒɺ ͦͷཧԼͷίϯςφ໊Λදࣔ͢Δ ίϯτϩʔϥʔ
controller-runtimeΛ ࣮ͬͨ (controller.go) ͲͷϦιʔεΛऔಘͯ͠ɺͲ͏͍͏ॲཧΛ࣮ߦ͢Δ͔ ɾ Reconciler ɾ
controller-runtimeΛ ࣮ͬͨ (controller.go) Namespace, Ϧιʔε(ReplicaSet)Λࢦఆͯ͠ɺ ϦιʔεͷใΛऔಘɺίϯςφ໊Λग़ྗ ɾ
controller-runtimeΛ ࣮ͬͨ (main.go) ControllerΛੜ ɾ ઌ΄Ͳఆٛͨ͠ReconcilerΛࢦఆ ɾ
controller-runtimeΛ ࣮ͬͨ (main.go) ɾࢦఆͨ͠ϦιʔεΛControllerͰࢹ ɾ ɾReplicaSetʹߋ৽͕͋ͬͨΒɺઌ΄ͲͷॲཧΛ࣮ߦ
controller-runtimeΛ ࣮ͬͨ ReplicaSetΛ࡞ͨ͠Βɺ ͦͷཧԼͷίϯςφͷ໊લ͕ දࣔ͞Εͨ 70ߦ͘Β͍Ͱ؆୯ʹॻ͚ͨ
࣮༻తͳControllerΛ࡞͍͖͍ͬͯͨ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ