Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Kubernetes のソースコードとの付き合い方 #gounco / Kubernetes ...
Search
d-kuro
May 27, 2019
Programming
24
5.2k
Kubernetes のソースコードとの付き合い方 #gounco / Kubernetes source code reading
Go(Un)Conference(Goあんこ)LT大会 6kg で発表した資料です
https://gounconference.connpass.com/event/129090/
d-kuro
May 27, 2019
Tweet
Share
More Decks by d-kuro
See All by d-kuro
Giftech2025春_GhostWriter
daikurosawa
0
5
kube-state-metrics Sharding
daikurosawa
0
350
Helm Chart を Unit Test する / Unit Testing Helm Chart
daikurosawa
0
2.1k
Understanding CPU throttling in Kubernetes to improve application performance #k8sjp
daikurosawa
12
15k
Leader Election in Kubernetes #k8sjp
daikurosawa
5
11k
Argo CD 実践ガイド #k8sjp / Argo CD Practice Guide
daikurosawa
13
8.6k
図で理解する Descheduler #k8sjp #ymju / Introduction to Descheduler
daikurosawa
12
23k
GolangCI を使ってコードの品質を保ちながら快適な Golang 生活を送る話 #gounco / GolangCI
daikurosawa
4
6k
Introduction gRPC
daikurosawa
1
280
Other Decks in Programming
See All in Programming
AI Agent 時代のソフトウェア開発を支える AWS Cloud Development Kit (CDK)
konokenj
6
900
The Evolution of Enterprise Java with Jakarta EE 11 and Beyond
ivargrimstad
0
360
チームで開発し事業を加速するための"良い"設計の考え方 @ サポーターズCoLab 2025-07-08
agatan
1
480
はじめてのWeb API体験 ー 飲食店検索アプリを作ろうー
akinko_0915
0
150
レベル1の開発生産性向上に取り組む − 日々の作業の効率化・自動化を通じた改善活動
kesoji
1
320
Porting a visionOS App to Android XR
akkeylab
0
850
[SRE NEXT] 複雑なシステムにおけるUser Journey SLOの導入
yakenji
0
190
React は次の10年を生き残れるか:3つのトレンドから考える
oukayuka
36
13k
効率的な開発手段として VRTを活用する
ishkawa
1
170
The Modern View Layer Rails Deserves: A Vision For 2025 And Beyond @ RailsConf 2025, Philadelphia, PA
marcoroth
2
750
TypeScriptでDXを上げろ! Hono編
yusukebe
3
820
おやつのお供はお決まりですか?@WWDC25 Recap -Japan-\(region).swift
shingangan
0
150
Featured
See All Featured
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
34
5.9k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
35
2.4k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.8k
It's Worth the Effort
3n
185
28k
Scaling GitHub
holman
460
140k
Fireside Chat
paigeccino
37
3.5k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.6k
Embracing the Ebb and Flow
colly
86
4.8k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
2.9k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
Transcript
Kubernetes ͷ ιʔείʔυͱͷ ͖߹͍ํ 19/05/27 Go(Un)ConferenceʢGo͋Μ͜ʣLTେձ 6kg @ponde_m
None
ࠓ͢͜ͱ • Kubernetes ͷΞʔΩςΫνϟʹ͍ͭͯ • Kubernetes ͷιʔείʔυΛಡΉࡍʹ ʹཱͭ Go ͷษڧձ͚ͩͲ
Kubernetes ͱͳΜͧ Έ͍ͨͳ͕݁ߏ͋Γ·͢ (Gopher ͘Μ͍ͬͺ͍ग़·͢)
Kubernetes ͱ
Kubernetes ͱ • ίϯςφΛಈ͔ͨ͢ΊͷϓϥοτϑΥʔϜ • ίϯςφΛ͍͍ײ͡ʹӡ༻͢ΔͨΊͷػೳΛ ͍ͬͺ͍͍࣋ͬͯΔ • σϓϩΠ, εέʔϦϯά,
ࣗݾम෮ etc… k8s ͬͯॻ͔ΕͨΓ͢Δͷ Kubernetes ͕ (k + 8 จࣈ + s) ͔ͩΒ
Kubernetes ͷ ΞʔΩςΫνϟ
• ΞʔΩςΫνϟʹ͍ͭͯཧղ͢Δͱ, ࣗͷಡΈ͍ͨ෦ͷίʔυ͕ Ͳͷίϯϙʔωϯτʹ͋Δͷ͔Θ͔Δ • ͦΕͧΕͷίϯϙʔωϯτͱ ͦͷʹ͍ͭͯཧղ͠Α͏ Kubernetes ͷΞʔΩςΫνϟ ࣍ͷϖʔδ͔Βͬ͘͟Γͱ
ਤΛ༻͍ͯઆ໌͠·͢
Kubernetes ͷΞʔΩςΫνϟ Master Node Node API API
Kubernetes ͷΞʔΩςΫνϟ Master Node Node API API
Kubernetes ͷΞʔΩςΫνϟ API Server Contoroller Manager Scheduler etcd
Kubernetes ͷΞʔΩςΫνϟ API Server Contoroller Manager Scheduler etcd API Server
Kubernetes ͷ ϦιʔεΛཧ͢Δ API Server શͯͷϦιʔεૢ࡞ API Server Λܦ༝ͯ͠ߦ͏
Kubernetes ͷΞʔΩςΫνϟ API Server Contoroller Manager Scheduler etcd Contoroller Manager
API Server ͰϦιʔεใͷ CRUD ͙Β͍͔͠ߦͳͬͯ ͓ΒͣɺϦιʔεʹର͢Δ࣮ࡍͷॲཧͷத Controller ͱݺΕΔίϯϙʔωϯτ͕ඇಉظͰߦͳ͍ͬͯΔ Controller (goroutine) Controller (goroutine) Controller (goroutine) ىಈ
Kubernetes ͷΞʔΩςΫνϟ API Server Contoroller Manager Scheduler etcd Scheduler Pod
(ίϯςφ) ΛϊʔυׂΓͯΔ
Kubernetes ͷΞʔΩςΫνϟ API Server Contoroller Manager Scheduler etcd ϦιʔεͷӬଓԽʹΘΕΔࢄ KVS
etcd
Kubernetes ͷΞʔΩςΫνϟ Master Node Node API API
Kubernetes ͷΞʔΩςΫνϟ API Server kube-proxy Pod Pod Pod Internet kubelet
Kubernetes ͷΞʔΩςΫνϟ API Server kubelet kube-proxy Pod Pod Pod Internet
kubelet ֤ϊʔυͰಈ࡞͢Δ Pod Λىಈ, ཧ͢ΔΤʔδΣϯτ kubelet
Kubernetes ͷΞʔΩςΫνϟ API Server kube-proxy Pod Pod Pod Internet kube-proxy
kubelet ֤ϊʔυͰಈ࡞͢Δ Service ͷఆٛΛݩʹϧʔςΟϯά ͯ͘͠ΕΔωοτϫʔΫϓϩΩγ kube-proxy
Kubernetes ͷΞʔΩςΫνϟ API Server kube-proxy Pod Pod Pod Internet Pod
Pod Pod kubelet Container Runtime Docker Ҏ֎ಈ͘ Pod Pod Pod
Kubernetes ͷ ιʔείʔυʹ͍ͭͯ
Kubernetes ͷιʔείʔυʹ͍ͭͯ • github.com/kubernetes/kubernetes • Go Modules ରԠͯ͠ΔͷͰ go mod
ίϚϯ υΛ࣮ߦ͢ΔͱϏϧυͰ͖ΔΑ͏ʹͳΔ • ಡΉ࣌ IDE ͰίʔυδϟϯϓΛ͓͏ 4݄͙Β͍ʹ Go Modules ରԠͨ͠ https://github.com/kubernetes/kubernetes/pull/74877
Kubernetes ͷιʔείʔυʹ͍ͭͯ • ϒϥβ͔Β͏࣌ SourceGraph Λ ೖΕΔͱศར • ϒϥβ͔Β Code
Jump Ͱ͖Δ • https://about.sourcegraph.com/
Kubernetes ͷιʔείʔυʹ͍ͭͯ • Kubernetes ͷίϯϙʔωϯτͷ࣮Ͱ github.com/spf13/cobra ͕ΘΕ͍ͯΔ • Server ͱͯ͠ৼΔ͏ͷ
cobra Ͱ࣮͞Ε͍ͯΔ • ࣮ߦ࣌ͷ Option ͰύϥϝʔλΛͨ͠ΓͰ͖Δ
main package Ͳ͜ʹ͋Δͷ͔
main package Ͳ͜ʹ͋Δͷ͔ • cmd package ͷதΛݟΔͱ֤ίϯϙʔωϯτ͝ ͱʹ͞Βʹ package ͕͔Ε͍ͯΔ
github.com/kubernetes/ kubernetes/cmd/ ͖ͬ͞ݟͨΑ͏ͳ໊લ͕ͪΒ΄Β
• main package ͦͷԼʹ͋Δ main package Ͳ͜ʹ͋Δͷ͔
None
Controller ʹ͍ͭͯ
Kubernetes ͷΞʔΩςΫνϟ API Server Contoroller Manager Scheduler etcd Contoroller Manager
API Server ͰϦιʔεใͷ CRUD ͙Β͍͔͠ߦͳͬͯ ͓ΒͣɺϦιʔεʹର͢Δ࣮ࡍͷॲཧͷத Controller ͱݺΕΔίϯϙʔωϯτ͕ඇಉظͰߦͳ͍ͬͯΔ Controller (goroutine) Controller (goroutine) Controller (goroutine) ىಈ ͓͞Β͍
• Ϧιʔεʹର͢Δ࣮ࡍͷॲཧͷத Controller ͱݺΕΔί ϯϙʔωϯτ͕ඇಉظͰߦͳ͍ͬͯΔ • ྫ͑ Deployment ͷಈ͖ͷ࣮͕ݟ͍ͨʂ ͬͯͳͬͨ࣌ʹ
API Server ͷίʔυΛಡΈʹߦͬͯ Կॻ͍ͯͳ͍ • Controller Λಡ͏ Controller ʹ͍ͭͯ ͜ͷ͜ͱΛΒͣʹ࠷ॳ API Server ͷίʔυಡΜͰ·ͨ͠
Controller ʹ͍ͭͯ Contoroller Manager Controller (goroutine) Controller (goroutine) Controller (goroutine)
ىಈ • ࣮ࡍʹͲΜͳײ͡ͳͷ͔ίʔυͰݟͯΈΔ
͜Μͳײ͡ͷ map Ͱఆٛ͞Ε͍ͯΔ https://github.com/kubernetes/kubernetes/blob/v1.14.2/ cmd/kube-controller-manager/app/ controllermanager.go#L341-L384
Controller ͷ໊લͱ Controller Λ࣮ߦ͢ΔͨΊͷؔ
func StartControllers() Ͱ Controller ΛൃՐ (ΊͬͪΌίʔυͬͯΔ) https://github.com/kubernetes/kubernetes/blob/v1.14.2/ cmd/kube-controller-manager/app/ controllermanager.go#L461-L501
͖ͬ͞ͷ map Λ for Ͱճͯ͠ ͜͜Ͱ Controller ͷ࣮ߦؔΛݺΜͰΔ
ྫͱͯ͠ Deployment ͷ Controller ͷ࣮ߦؔ https://github.com/kubernetes/kubernetes/blob/v1.14.2/ cmd/kube-controller-manager/app/apps.go#L82-L97
ίϯετϥΫλͰ Controller Λ࡞ͬͯ goroutine Ͱ Controller Λ࣮ߦ
·ͱΊ • Kubernetes ͷΞʔΩςΫνϟ ͓֮͑ͯ͘ͱʹཱͭ • Kubernetes ͷιʔείʔυҙ֎ʹಡΊΔ • Go
ಡΈ͍͢ ΈΜͳಡ͏
͓·͚
ʹཱͭϦϯΫͱ͔ • github.com/jamiehannaford/what-happens-when-k8s • Kubernetes ͕ىಈ͔ͯ͠ΒͲΜͳ͜ͱΛ͍ͯ͠Δ͔ ιʔείʔυϨϕϧͰղઆͯ͘͠ΕΔ • ͳΜͱຊޠ ver
͋Δ • ιʔείʔυͷϦϯΫ͕ݹ͔ͬͨΓ, ϦϯΫΕͩͬͨ Γ͢ΔͷͰ PR Λग़ͦ͏! (ग़ͯ͠Δ)
ʹཱͭϦϯΫͱ͔ • https://gopherize.me/ • Զ͚ͩͷ࠷ߴʹ͔Θ͍͍ Gopher ܅Λ࡞ΕΔαΠτ
͓͠·͍