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
Writing Kubenetes tools in Go
Search
Daisuke Fujita
June 20, 2016
Programming
1
3.5k
Writing Kubenetes tools in Go
Kubernetes Meetup Tokyo #2
http://k8sjp.connpass.com/event/33508/
の発表資料です
Daisuke Fujita
June 20, 2016
Tweet
Share
More Decks by Daisuke Fujita
See All by Daisuke Fujita
SREcon19 Asia/Pacific Recap
dtan4
0
150
Our Practices of Delegating Ownership in Microservices World
dtan4
4
8.8k
Kubernetes Cluster Upgrade / Mercari Meetup for Microservices Platform
dtan4
3
4.5k
KubeCon EU 2018 Recap: Multi-Tenancy in Kubernetes: Best Practices Today, and Future Directions / Kubernetes Meetup Tokyo 11 #k8sjp
dtan4
1
1.8k
Wantedly から Chef を一掃した話 / #chibadan
dtan4
24
11k
さようなら Chef こんにちは Dockerfile / Web Tech Tokyo #1
dtan4
6
7.1k
Docker をフル活用したインフラの紹介と成長し続けるためのインフラ戦略 / #abejameetup
dtan4
19
3.9k
Docker Compose PaaS の作り方、そして社内に導入した話 / #yapc8oji
dtan4
1
8.2k
最近の wercker 便利って話 #tqrk10
dtan4
2
920
Other Decks in Programming
See All in Programming
Symfony Mapper Component
soyuka
2
730
開発者とQAの越境で自動テストが増える開発プロセスを実現する
92thunder
1
180
これが俺の”自分戦略” プロセスを楽しんでいこう! - Developers CAREER Boost 2024
niftycorp
PRO
0
190
ゆるやかにgolangci-lintのルールを強くする / Kyoto.go #56
utgwkk
1
350
今からはじめるAndroidアプリ開発 2024 / DevFest 2024
star_zero
0
1k
선언형 UI에서의 상태관리
l2hyunwoo
0
140
MCP with Cloudflare Workers
yusukebe
2
220
Go の GC の不得意な部分を克服したい
taiyow
2
760
range over funcの使い道と非同期N+1リゾルバーの夢 / about a range over func
mackee
0
110
Semantic Kernelのネイティブプラグインで知識拡張をしてみる
tomokusaba
0
180
LLM Supervised Fine-tuningの理論と実践
datanalyticslabo
3
940
アクターシステムに頼らずEvent Sourcingする方法について
j5ik2o
4
170
Featured
See All Featured
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
26
1.9k
Being A Developer After 40
akosma
87
590k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
356
29k
Code Review Best Practice
trishagee
65
17k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
45
2.2k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
232
17k
Why You Should Never Use an ORM
jnunemaker
PRO
54
9.1k
Agile that works and the tools we love
rasmusluckow
328
21k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Statistics for Hackers
jakevdp
796
220k
Rails Girls Zürich Keynote
gr2m
94
13k
Transcript
Writing Kubernetes tools in Go ,VCFSOFUFT.FFUVQ5PLZP %BJTVLF'VKJUB!EUBO
Daisuke Fujita @dtan4
$ k8sec CLI tool to manage Kubernetes Secrets easily
k8sec • Kubernetes Secret Λखܰʹ͍͡Δπʔϧ • Interface like Heroku CLI
(heroku config) • Written in Go dtan4/k8sec $ k8sec <command> \ [--kubeconfig KUBECONFIG] \ [--namespace NAMESPACE] \ ARGS
Why k8sec? • Secret ΛΞϓϦέʔγϣϯͷڥมʹ͍͍ͨ • kubectl ͰΔͱ໘ͩͬͨ • kubectl
ͩͱҰൃͰ list, update Ͱ͖ͳ͍ • Ұ YAML ʹు͍ͯ replace http://kubernetes.io/docs/user-guide/secrets/#using-secrets-as-environment-variables $ kubectl create secret generic my-secret \ --from-literal=key1=supersecret \ --from-literal=key2=topsecret $ kubectl get secret registrykey -o json \ | jq -r '.data[".dockercfg"]' | base64 -D
k8sec $ k8sec list rails NAME TYPE KEY VALUE rails
Opaque database-url "postgres://example.com:5432/dbname" # Show values as base64-encoded string $ k8sec list --base64 rails NAME TYPE KEY VALUE rails Opaque database-url cG9zdGdyZXM6Ly9leGFtcGxlLmNvbTo1NDMyL2RibmFtZQ== Ұཡදࣔ list dtan4/k8sec
k8sec # Set secret $ k8sec set rails rails-env=production rails
# Pass base64-encoded value $ echo dtan4 | base64 ZHRhbjQK $ k8sec set --base64 rails foo=ZHRhbjQK rails $ k8sec list rails NAME TYPE KEY VALUE rails Opaque database-url "postgres://example.com:5432/dbname" rails Opaque foo "dtan4\n" # Unset secret $ k8sec unset rails rails-env ઃఆɺղআ set,unset dtan4/k8sec
k8sec # Save as .env $ k8sec save -f .env
rails $ cat .env database-url="postgres://example.com:5432/dbname" # Load .env $ k8sec load -f .env rails LFZWBMVFFOW load,save dtan4/k8sec
Why k8sec? • Secret ΛΞϓϦέʔγϣϯͷڥมʹ͍͍ͨ • kubectl ͰΔͱ໘ͩͬͨ • kubectl
ͩͱҰൃͰ list, update Ͱ͖ͳ͍ • Ұ YAML ʹు͍ͯ replace http://kubernetes.io/docs/user-guide/secrets/#using-secrets-as-environment-variables $ kubectl create secret generic my-secret \ --from-literal=key1=supersecret \ --from-literal=key2=topsecret $ kubectl get secret registrykey -o json \ | jq -r '.data[".dockercfg"]' | base64 -D
kubectl • ສೳʂ • API ͬͨΓͳͷͰɺ࣮ӡ༻Ͱ͍ʹ͍͘෦ • ඇӡ༻ଆ (e.g. Rails
developer) ͕৮Δʹ ֶशίετ͕ߴ͍…ʁ => ࣗͨͪͷཁٻʹదͨ͠ wrapper Λ࡞Ζ͏
kubectl wrapper • ଞݴޠ͔Β kubectl ίϚϯυΛୟ͘ͷ εϚʔτ͡Όͳ͍ • kubectl ͬͯཁ͢Δʹ
Kubernetes API ΫϥΠΞϯτͰ͢ΑͶ • API Λୟ͘Α͏ʹ͢Ε͍͍ͷͰ…ʁ
Kubernetes API Client Library https://github.com/kubernetes/kubernetes/blob/master/docs/devel/client-libraries.md
k8s.io/kubernetes/pkg/client Official Kubernetes API client library
API ΫϥΠΞϯτ࡞ loadingRules := clientcmd.NewDefaultClientConfigLoadingRules() loadingRules.ExplicitPath = clientcmd.RecommendedHomeFile loader :=
clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{}) clientConfig, err := loader.ClientConfig() if err != nil { return nil, err } kubeClient, err := client.New(clientConfig) if err != nil { return nil, err } import ( "k8s.io/kubernetes/pkg/api" client "k8s.io/kubernetes/pkg/client/unversioned" "k8s.io/kubernetes/pkg/client/unversioned/clientcmd" )
API ΫϥΠΞϯτ࡞ loadingRules.ExplicitPath = clientcmd.RecommendedHomeFile • loadingRules.ExplicitPath ʹ ίϯϑΟάϑΝΠϧͷύεΛࢦఆ •
RecommendedHomeFile == ~/.kube/config https://github.com/kubernetes/kubernetes/blob/master/pkg/client/unversioned/clientcmd/loader.go
API ݺͼग़͠ pods, err := kubeClient.Pods(api.NamespaceDefault).List(api.ListOptions{}) • ·ͣ Pods, Secret
ͷΑ͏ʹϦιʔεࢦఆ w Ҿ/BNFTQBDF • api.NamespaceDefault == "default" • api.NamespaceSystem == "system" w ϦιʔεʹνΣΠϯͯ͠ૢ࡞Λࢦఆ • Get(name), List kubeClient.<resource>.<operation> https://github.com/kubernetes/kubernetes/blob/4a78db61370df83a37957490749f7d171b00c28a/pkg/api/types.go#L154-L161
Pod ҰཡΛग़ྗ for _, pod := range pods.Items { fmt.Println(pod.Name)
} hello-world-e2d3x wordpress-mysql-488205646-t6v4k
ҙ • k8s.io/kubernetes Kubernetes ຊମͷϦϙδτϦ ͳͷͰɺͰ͔ͯ͘ॏ͍ (400 Mbyte ~)
• github.com/docker/docker ґଘͯ͠Δ • Godeps Έ͍ͨʹ vendoring ΛϦϙδτϦʹؚΊΔ ߹ཁҙ • glide ͓͏ • kubectl ͷιʔε (pkg/kubectl) Λಡ͏
·ͱΊ • Secret Λ؆୯ʹѻ͑Δ k8sec ͱ͍͏πʔϧΛ ࡞Γ·ͨ͠ • Go ͷ
API client library ΛͬͯɺKubernetes Λ ૢ࡞͢Δํ๏Λհ͠·ͨ͠ • ܅͚ͩͷ Kubernetes tool Λ࡞Ζ͏