Rails on Docker - Speaker Deck

Rails on Docker

by Daiki Hirakata

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Rails on Docker @bigplants May 10th 2018 @Omotesando.rb

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Who am I ? • Daiki Hirakata (36) • Software Engineer • Main Programing Languages:  PHP, Ruby • Primary interests:  DevOps, Docker, Kubernetes, Microservice Architecture, GCP @bigplants

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࠷ۙϥϯχϯά͸͡Ί·ͨ͠

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ͪΐͬͱ͚ͩએ఻

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ઈࢍ։ൃऀืूதʂ • ϓϩμΫτ໊: ALL-IN • اۀ׆ಈͰඞཁͳશͯͷ πʔϧ͕ೖ͍ͬͯΔ • Rails, Angular, AWS • גࣜձࣾϏδωεόϯΫ άϧʔϓ

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ݱࡏɺεςʔδϯά؀ڥΛ ઈࢍKubernetesҠߦதͰ͢ɻ

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ϩʔυϚοϓ • ։ൃ༻ίϯςφ४උ • ެ։༻ίϯςφ४උ • GKEʹσϓϩΠ <- ΠϚίί • CI/CDύΠϓϥΠϯͷ੔උ  ͍ͭͰ΋୭Ͱ΋͓खܰʹk8sΫϥελʹ؀ڥߏங&σ ϓϩΠͰ͖ΔΑ͏ʹ͢Δ

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໨ࢦͤʂ ແݶεςʔδϯάͷ࣮ݱʂ

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ࠓ೔͸ެ։؀ڥ༻ͷ Rails on Docker ͳ࿩Λ͠·͢ɻ × ΄΅dockerͷ࿩Ͱ͢ɻɻ

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Rails appΛ docker build͢Δͱ͖

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݁ߏ΍Δ͜ͱ͋Δ • bundle install • npm install • rake bower:install • rake bower:resolve • rake assets:precompile • And more tasks…

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ނʹɺdocker buildʹ ͔͔࣌ؒΔ Լख͢Δͱover 10min

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ߋʹΠϝʔδαΠζͷංେԽ Լख͢Δͱover 1.5GB

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docker build͸1secͰ΋ૣ͍ ΄͏͕͍͍ git pushͷ౓ʹCIʹdocker build͍ͤͨ͞

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docker image͸1MBͰ΋ܰ ͍΄͏͕͍͍ Google Container Registory΁ͷ ΞοϓϩʔυɺGKE΁ͷσϓϩΠʹӨڹ͢Δ

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docker build docker push git push kubectl apply get image

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docker build docker push git push kubectl apply get image Ϗϧυʹ͔͔࣌ؒΔͱ

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docker build docker push git push kubectl apply get image ΠϝʔδͷαΠζ͕σΧΠͱ

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Ϗϧυͷ࣌ؒΛ୹ॖ͢Δʹ͸ʁ

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ΩϟογϡΛ͏·͔ͭ͘͏

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No content

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ΠϝʔδͷαΠζΛ཈͑Δʹ ͸

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·ͣඞཁͳ΋ͷΛશ෦ೖΕΔ

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ཁΒͳ͍΋ͷΛ࡟আ ಉ͡Dockerﬁle಺

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΋͏Ұ౓ίϐʔ ಉ͡Dockerﬁle಺

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͜ΕͰΠϝʔδͷαΠζ͕ 1.5GB -> 500MB͘Β͍ʹʂ ※͋͘·Ͱචऀͷ؀ڥͰͷ࿩Ͱ͢

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Tips

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docker buildͰ؀ڥม਺Λॻ ͖׵͑Δʹ͸

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docker buildͰ͸ENVΛ౉ͤͳ ͍

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--build-arg͕࢖͑ͦ͏

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ARGͰENVΛॻ͖׵͑Δ • docker build --build-arg RAILS_ENV=production --build-arg HOGE=fuga

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ARGͷҐஔ΋ॏཁ

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ARGͷҐஔ΋ॏཁ

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RUN಺Ͱ؀ڥม਺Λૢ࡞͢Δ΂ ͖Ͱͳ͍ • ͨͩͷshellͩͱ͍͏ࣄΛཧղ͢Δ

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ϨΠϠ͕෼͔ΕΔͱͦΕͧΕ༰ྔΛ৯͏ɻͳΔ΂͘RUN͸·ͱΊΔ ͋ͱ͔Β࡟আͯ͠΋Πϝʔδα Πζ͸มΘΒͳ͍

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΋͘͠͸ɺ͖ͬ͞ग़͖ͯͨ Multi-stage buildͷςΫχο ΫͰ

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docker history ͰͲ ͜ͰαΠζ͕๲ΒΜͰΔ͔֬ೝ

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σόοάͷͨΊʹ͍Βͳ͍΋ͷΛ࡟আ͢Δ લͷঢ়ଶͰ֬ೝͰ͖ΔΑ͏ʹεςʔδΛΘ ͚Δ • docker build --target -t

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ࠓ೔ͷ·ͱΊ • Ϗϧυߴ଎ԽͷҝʹΩϟογϡΛ͏·͘࢖͓ ͏ • ΠϝʔδαΠζͷѹॖͷͨΊʹMulti-stage build͠Α͏