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Writing Kubenetes tools in Go
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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
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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