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
3.6k
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
190
Our Practices of Delegating Ownership in Microservices World
dtan4
4
8.9k
Kubernetes Cluster Upgrade / Mercari Meetup for Microservices Platform
dtan4
3
4.7k
KubeCon EU 2018 Recap: Multi-Tenancy in Kubernetes: Best Practices Today, and Future Directions / Kubernetes Meetup Tokyo 11 #k8sjp
dtan4
1
1.9k
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
7.2k
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
4k
Docker Compose PaaS の作り方、そして社内に導入した話 / #yapc8oji
dtan4
1
8.5k
最近の wercker 便利って話 #tqrk10
dtan4
2
940
Other Decks in Programming
See All in Programming
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
380
Updates on MLS on Ruby (and maybe more)
sylph01
1
180
go test -json そして testing.T.Attr / Kyoto.go #63
utgwkk
3
310
チームのテスト力を鍛える
goyoki
3
170
AWS発のAIエディタKiroを使ってみた
iriikeita
1
190
1から理解するWeb Push
dora1998
7
1.9k
時間軸から考えるTerraformを使う理由と留意点
fufuhu
16
4.8k
そのAPI、誰のため? Androidライブラリ設計における利用者目線の実践テクニック
mkeeda
2
310
Deep Dive into Kotlin Flow
jmatsu
1
350
Design Foundational Data Engineering Observability
sucitw
3
200
「待たせ上手」なスケルトンスクリーン、 そのUXの裏側
teamlab
PRO
0
530
Namespace and Its Future
tagomoris
6
700
Featured
See All Featured
How to Ace a Technical Interview
jacobian
279
23k
Code Reviewing Like a Champion
maltzj
525
40k
Embracing the Ebb and Flow
colly
87
4.8k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.7k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
50k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
We Have a Design System, Now What?
morganepeng
53
7.8k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
How STYLIGHT went responsive
nonsquared
100
5.8k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
188
55k
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