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Kubernetes helm & helmc
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Aya (Igarashi) Ozawa
June 20, 2016
Technology
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Kubernetes helm & helmc
Helm is package management tool for Kubernetes.
This slide describe how to use helm!
Aya (Igarashi) Ozawa
June 20, 2016
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Transcript
1 k8s helm & helmc Kubernetes meetup Tokyo #2
2 ABOUT ME Software Engineer I’m developing cloud services. AYA
IGARASHI NTT Communications @Ladicle
3 AGENDA INTRODUCTION 01 02 03 ࠓ·Ͱͷཧํ๏ 04 HOW TO
MANAGE MANIFESTS? ABOUT K8S HELM & HELMC WHICH IS BETTER? HAPPY HELMING ͲΜͳͷ͔ɺҧ͍Կ͔ ͲͪΒΛͲͷΑ͏ͳߏͰ͏͖͔ ·ͱΊ
4 How to mange Manifests?
5 BASH MANAGEMENT of MANIFEST 1 source env.sh 2 printf
"cat <<++EOS\n%s\n++EOS\n" "$(cat *service.yaml *deployment.yaml)" \ 3 | sh > all-in-one.yaml ڥ͝ͱʹมߋ͍ͨ͠Λbashมͱͯ͠ManifestʹຒΊࠐΈɺ ࣮ߦ͍ͨ͠ڥͷઃఆϑΝΠϧΛಡΈࠐΜͰ͔ΒγΣϧܳΛ͍ͯͨ͠ ࠓ·Ͱ 1 apiVersion: extensions/v1beta1 2 kind: Deployment 3 metadata: 4 name: rabbitmq${SUFFIX} 5 spec: 6 replicas: ${REPLICA_NUMBER} 7 template: 8 metadata: 9 labels: 04 02 rabbitmq-deployment.yaml labelsҎ߱লུ͍ͯ͠Δ install-service-and-deployment.sh env.shͷதͰมΛexport
6 PROBLEMS MANAGEMENT of MANIFEST 01 DUPLICATE DEFINITIONS containersͷenvϑΟʔϧυʹෳͷϑΝΠϧʹڞ ௨ͷڥม͕ఆٛ͞Ε͍ͯΔͨΊɺमਖ਼࿙Ε͕
ൃੜ͢Δɻ(࿈ྻ͕͍͍ͨ….) 02 HARD TO READ γϯϓϧʹߏతͳมΛఆٛͰ͖ͳ͍ͨΊઃఆ ϑΝΠϧ͕ಡΈͮΒ͍ɻ 03 YAML LINT IS NOT ENOUGH ৺ͷฏԺͷͨΊmanifestΛk8sΠϯετʔϧ͢Δલ ʹࢼݧΛ࣮ࢪ͔͕ͨͬͨ͠ɺYAML lintͰ݁Ռ͕ PASSEDͰ͋ͬͯk8sͰಈ͔ͳ͍͜ͱ͕ଟʑ͋ͬͨɻ PROBLEM BASH
7 By Helm
8 What is Helm? ABOUT K8S HELM & HELMC GolangͷTemplate֦ுϥΠϒϥϦͰ͋ΔSprigͷه๏ΛͬͯManifestϑΝΠϧΛ
ఆٛ͢Δ͜ͱ͕Ͱ͖Δɻ·ͨɺαϒίϚϯυͱͯ͠จ๏νΣοΫΛߦ͏ lintίϚϯυ͕ఏڙ͞Ε͍ͯΔɻ K8SͷύοέʔδϚωʔδϟ 1 # Githubb্Ͱެ։͞Ε͍ͯΔnginxύοέʔδΛݕࡧ 2 $ helmc search nginx 3 example-nginx - An example nginx + git-sync application 4 nginx - Nginx http service 5 nginx-alpine - Nginx http service 6 7 # KubernetesnginxΛΠϯετʔϧ͢Δ 8 $ helmc install nginx 9 ---> No chart named "nginx" in your workspace. Fetching now. 10 ---> Running `kubectl create -f` ... 11 service "nginx" created 12 replicationcontroller "nginx" created 13 ---> Done
9 Diff Helm Helmc
10 ALL Different HELM CLASSIC KUBERNETES HELM Oct 18, 2015ʹDEISʹΑͬͯ࡞ΒΕͨ
CLIͰChartͷ࡞/আ/ߋ৽͕Ͱ͖Δɻ ChartͷόʔδϣϯGitͷSHAsͰఆ ͞Ε͍ͯΔɻ Nov 1, 2015ʹk8sऔΓࠐ·ΕͨΫϥΠΞ ϯταʔόܕͷπʔϧɻ12FactorAppͷࢥ ΛͱʹChart + Config = Release ͱ͍͏ ߏΛͱ͍ͬͯΔɻ What is Chart? k8sͷΠϯελϯεΛ࡞͢ΔͨΊʹඞཁͳ ςϯϓϨʔτ/ͷू߹ମ
11 02 KUBERNETES GITHUB install uninstall NGINX WORD PRESS MYSQL
HELMC CHART FILES publish, fetch Create using kubectl Helm Classic ABOUT K8S HELM & HELMC
12 02 KUBERNETES install chart delete Release TILLER CHART FILES
Kubernetes Helm ABOUT K8S HELM & HELMC HELM REST/JSON gRPC STORAGE NGINX WORD PRESS MYSQL Create Chart files contain Chart packages Package Chart files NGINX CHART PACKAGE get/update Release TarBall
13 Which is Better?
14 Which is better? Kubernetes Helm·ͩόʔδϣϯAlpha-1͕ϦϦʔε͞Ε ͔ͨΓͰಈ͔ͳ͍ͷ͕ଟ͍ͨΊɻ Which is better?
Now HELM CLASSIC Helm Classicϝϯςφϯε͞Εͳ͘ͳΔͨΊɺ͋Δఔ҆ఆ͔ͯ͠ ΒҠͬͨํ͕Α͍ɻϩʔυϚοϓʹΑΔͱBeta1ʹChart.yamlͷ ϑΥʔϚοτΛFix͢ΔΒ͍͠ͷͰͦͷࠒʹҠಈͯ͠Αͦ͞͏ ROAD MAP: https://github.com/kubernetes/helm/issues/694 Feature KUBERNETES HELM
15 How to use Helmc
16 How to use Helmc? WHICH IS BETTER? ςϯϓϨʔτͱมݟ௨͕͠Α͍Α͏ʹσΟϨΫτϦΛ৽ͨʹ͍ͬͯΔɻ ·ͨɺมڥ͝ͱʹϑΝΠϧΛׂ͠ڞ௨ͷσϑΥϧτtemplateʹఆ͍ٛͯ͠Δɻ
FILE STRUCTURE Variable file format HelmcͰมϑΝΠϧͷϑΥʔϚοτJSON/ YAML/TOMLͷத͔ΒબͰ͖Δ͕ɺk8s HelmTOML ͷΈͷͨΊɺҠߦͷ͔͢͠͞ΒTOML͕͓͢͢Ί deployments-generator.sh ࣍ϖʔδͰઆ໌͢ΔCustomize generator͔Βݺͼͩ ͍ͯ͠ΔManifestͷੜεΫϦϓτ └── rabbitmq ├── Chart.yaml ├── README.md ├── deployemnts-generator.sh ├── manifests ├── templates │ ├── service.yaml │ └── deployment.yaml └── variables └── lab1.toml.tpl └── lab2.toml.tpl
17 Custom Generator WHICH IS BETTER? deployments-generator.sh (ൈਮ) ( 1
# helm:generate $HELM_GENERATE_DIR/deployemnts-generator.sh 2 apiVersion: extensions/v1beta1 3 kind: Deployment 1 echo "deploymentType = \"${type}\"" > $tempdir/values.toml 2 3 for type in "age" "hoge"; do 4 helmc template -d $tempdir/values.toml \ 5 -o manifests/${type}-deployment.yaml $HELM_GENERATE_FILE 6 done deployment.yaml (ൈਮ) templateίϚϯυΛͬͯManifestΛੜ͢Δͱ֤ϑΝΠϧຖʹ࣮ߦ͠ͳ͚ΕͳΒͳ͍͕ɺgenerateί ϚϯυΛ༻͢ΔͱҎԼͷdeployment.yamlͷΑ͏ʹҰߦʹgenerator͕ࢦఆ͞Ε͍ͯΔͷΛChartσΟ ϨΫτϦͷத͔Βऩू͠ɺҰׅͯ͠ManifestΛੜ͢Δ͜ͱ͕Ͱ͖Δɻ(Jenkinsͱͷ૬ੑΑ͠ʂ)
18 More Information
19 More Information HAPPY HELMING 01 02 03 http://slack.kubernetes.io/ KUBERNETES
SLACK #HELM CHANNEL MEETING ON ZOOM JAPANESE DOCUMENT Contribution ·ͩ·ͩ࢝·͔ͬͨΓͷ໘ന͍ϓϩδΣΫτ খ͞ͳόάFIXͰRV, MG͞ΕΔ खॱଞͷk8sϓϩδΣΫτͱಉ͡Ͱ͢ https://engineyard.zoom.us/j/ https://github.com/Ladicle/kubernetes-helm-jp-doc
20 HAPPY HELMING! Thanks for watching @ladicle