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Helm Chart を Unit Test する / Unit Testing Helm C...
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d-kuro
June 24, 2021
Programming
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Helm Chart を Unit Test する / Unit Testing Helm Chart
Kubernetes Meetup Tokyo #42 で発表したスライドです
https://k8sjp.connpass.com/event/214286/
d-kuro
June 24, 2021
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Transcript
Chart Λ Unit Test ͢Δ Kubernetes Meetup Tokyo #42 LT
I work for @ponde_m @d-kuro
Summary • Helm Chart ͷ Test ʹ͍ͭͯ • Helm Chart
Λ Unit Test ͢ΔͨΊͷϥΠϒϥϦΛ࣮ͨ͠ • ࣮ͷৄࡉ • “k8s.io” ϥΠϒϥϦΛͬͨ Tips ͷհ
Testing Helm Charts --set autoscaling.enabled=false --set replicaCount=3
Testing Helm Charts • Helm ʹςετػߏ͕ଘࡏ͢Δ • “helm.sh/hook: test” annotation
Λ༩ͨ͠ Pod ఆٛΛ༻ҙ͢Δ • “<chart-name>/templates/tests/“ ʹஔ͢Δ • “helm install” ͨ͋͠ͱʹ “helm test” Λ࣮ߦ͢Δ • Pod ͕ exit 0 Ͱऴྃ͢Εςετ͕ޭͨ͠ͱΈͳ͞ΕΔ
None
None
Testing Helm Charts • ͜ͷςετػߏͲͪΒ͔ͱ͍͑ Integration Test • values.yaml ʹఆٛͨ͠
Option ͕ҙਤͨ͠௨Γʹػೳ͢Δ͔ Ͳ͏͔ͳͲͷ Unit Test Ϩϕϧͷ֬ೝ͕͔ͨͬͨ͠
Unit Testing Helm Charts • Go Ͱ Helm Chart Λ
Unit Test ͢Δ • “helm.sh/helm/v3” Λ import ͯ͠ “helm template” ίϚϯυͰ༻͍ͯ͠ΔؔΛݺͼग़͢ • ϨϯμϦϯά͞Εͨ YAML ͕ string Ͱ͑ΔͷͰ ͍͍ײ͡ʹൺֱ͢Δ
Unit Testing Helm Charts • ࡞ͨ͠ϥΠϒϥϦ • github.com/d-kuro/helmut • “helm
template” ίϚϯυ૬ͷॲཧΛ࣮ߦ͢ΔϥΠϒϥϦ • Assert ༻ͷؔΛఏڙ • github.com/google/go-cmp Λ༻ͨ͠ diff Λදࣔ͢Δ
None
None
None
Unit Testing Helm Charts • ྨࣅͷϥΠϒϥϦ • github.com/gruntwork-io/terratest/modules/helm • ෦Ͱ
“helm tempalte —show-only” ίϚϯυΛ࣮ߦ͍ͯ͠Δ • github.com/Waterdrips/helmunit • Helm ͷύοέʔδΛ import ͢Δಉ༷ͷΞϓϩʔν • Assert ؔͳͲͳ͍
Architecture map[ObjectKey]runtime.Object Rendered Manifests Exec helm template Render Convert Get
User
Exec helm template
None
Split Manifests
None
Convert from Raw Manifest to runtime.Object
None
Assert • ݱࡏ Contains ͔࣮͍ؔͯ͠͠ͳ͍ • Contains ؔʹ͞Εͨ Object Λ
map ͔Β Get ͯ͠ google/go-cmp Ͱൺֱͯ͠ߏମͷ diff Λදࣔ͢Δ • runtime.Object Λ͢ํ๏ͱ YAML or JSON ͷ Manifest Λ͢ํ๏ͷ 2 ͭΛఏڙ • ͢ runtime.Object ͷ TypeMeta ۭͳΒಈతʹઃఆ
TypeMeta ͷهड़͕ෆཁʹͳΔ
Get GVK from runtime.Object
None
Assert • Helm ʹΑ͘ΘΕΔ label annotation ͳͲͷ ࠩΛແࢹ͢ΔͨΊͷ
Option Λఏڙ
Omit Metadata
None
Conclude • Helm Chart Λ Unit Test ͢ΔͨΊͷϥΠϒϥϦΛ࡞ͬͨ • github.com/d-kuro/helmut
• ྑ͚Ε͍ͬͯͩ͘͞
Thank You for Listening