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Kubernetesのカスタマイズポイントのまとめ
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kuromatsu
March 27, 2019
Technology
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1.5k
Kubernetesのカスタマイズポイントのまとめ
https://fujitsufjct.connpass.com/event/123320/
kuromatsu
March 27, 2019
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Transcript
Kubernetesͷ ΧελϚΠζϙΠϯτͷ·ͱΊ ࢜௨ݚڀॴ ਓೳݚڀॴ @kuromt_ 1
ࣗݾհͱຊͷ͓ • TwitterΞΧϯτ: @kuromt_ • ॴଐɿ࢜௨ݚڀॴɹਓೳݚڀॴ – ػցֶशج൫ΛKubernetes্ʹߏஙͯ͠2ؒۙ͘ӡ༻த • ຊͷ͓
- KubernetesΛ֦ு͢Δํ๏ͷ·ͱΊ • KubernetesΛͬͨج൫Λߏங͢Δͱ͖ʹ͍ͬͯΔͱศར 2
KubernetesͷجຊతͳॲཧͷྲྀΕ •Reconciliation Loop - Controller͕ϦιʔεΛΉঢ়ଶʹ͚ۙͮΔ APIServer Controller watch Ή ঢ়ଶ
Resource diff action Resource Resource ೝূ ೝՄ Admission Controller 1. Ήঢ়ଶ͕ॻ͖Θͬͨ͜ͱΛݕ 2. Ήঢ়ଶͱ࣮ଶͷࠩΛ֬ೝ 3. Ήঢ়ଶʹ͚ۙͮΔΑ͏ʹॲཧΛ࣮ߦ ϦΫΤετ 3 Pod͕3ͭ replicas: 3
Admission Controller •ೝূɺೝՄΛࡁ·ͤͨ͋ͱʹϦΫΤετΛϋϯυϧ͢Δ֦ு - APIServerىಈ࣌ʹద༻͢ΔAdmission Controller - ॲཧ༰ΛࣗͰ࣮͠ޙ͔ΒՃՄೳͳDynamic Admission Controller
APIServer Controller watch Ή ঢ়ଶ Resource diff action Resource Resource ೝূ ೝՄ Admission Controller ϦΫΤετ Dynamic Admission Controller 4
Custom Resource Definition •APIServerʹಠࣗͷϦιʔεΛొ͢ΔΈ - ରԠ͢ΔControllerΛࣗͰ࣮͢Δඞཁ͕͋Δ Custom Controller watch Ή
ঢ়ଶ Resource Resource Custom Resource diff action ϦΫΤετ ೝূ ೝՄ Admission Controller APIServer 5
Aggregated APIServer •APIServerͷׂΛ࣋ͭαʔόΛผ్༻ҙ͢Δ֦ு - APIServerʹ͋ΔAggregated Layer͕ϓϩΩγͱͯ͠ৼ͏ - Aggregated APIServerࣗͰ༻ҙ͢Δ APIServer
ೝূ ೝՄ ϦΫΤετ Aggregated APIServer 6
ͦΕͧΕͷΧελϚΠζϙΠϯτͷཧ 7 ࣮ ॊೈੑ ༻్ Admission Contoller ෆཁ ࣄલʹܾΊΒΕͨϙϦγʔ ͷΈΛ͏ͷͰ͍
ϦΫΤετ༰ͷϋϯυϧ Dynamic Admission Controller ඞཁ ͋Δఔ੍͕͋Δ͕ൺֱ తࣗ༝ ϦΫΤετ༰ͷϋϯυϧ Custom Resource Definition ඞཁ ͋Δఔ੍͕͋Δ͕ൺֱ తࣗ༝ ಠࣗϦιʔεͷՃͱཧ Aggregated API Server ඞཁ ΄ͱΜͲ੍͕ͳࣗ͘༝ ্هҎ֎