Container Build Talk - Speaker Deck

Container Build Talk

by orisano

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Container Buildͷ࿩ @orisano

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Agenda • docker buildͷ࿩ • CI ʹ͓͚Δdocker build • docker buildʹඞཁͩͬͨ΋ͷ

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Agenda • docker buildͷ࿩ • CI ʹ͓͚Δdocker build • docker buildʹඞཁͩͬͨ΋ͷ

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EPDLFSDMJ EPDLFSE HTTP

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EPDLFSDMJ EPDLFSE HTTP Mac LinuxKit

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EPDLFSDMJ EPDLFSE HTTP Mac LinuxKit $ docker build [build context]

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EPDLFSDMJ EPDLFSE HTTP Mac LinuxKit $ docker build [build context] directoryҎԼΛ.dockerignore Λߟྀͯ͠tarʹ͢Δ

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EPDLFSDMJ EPDLFSE HTTP Mac LinuxKit $ docker build [build context] directoryҎԼΛ.dockerignore Λߟྀͯ͠tarʹ͢Δ tar

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Dockerﬁle

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Dockerﬁle͸ ෳ਺ͷεςʔδΛ࣋ͭ εςʔδ ≒ Πϝʔδ

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Stage FROM image [AS stage] RUN apk add ca-certiﬁcates COPY package.json . COPY package-lock.json . ENV NODE_ENV=production RUN npm ci COPY . . RUN npm run build

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Dockerﬁle Stage 1 Stage 2 Stage 3

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Ұ౓ͷbuildͰ࡞ΕΔͷ͸ 1Πϝʔδ͚ͩ

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جຊతʹ ࠷ޙͷεςʔδ͕ग़ྗ͞ΕΔ

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Dockerﬁle Stage 1 Stage 2 Stage 3

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—targetͰࢦఆ͢Δͱ ग़ྗΠϝʔδΛܾΊΒΕΔ

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Dockerﬁle Stage 1 Stage 2 Stage 3 —target

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Πϝʔδ͸ ϨΠϠʔͷੵΈॏͶͰ ࡞ΒΕΔ

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ϨΠϠʔ͕࡞ΒΕΔͷ͸ COPY/ADD, RUN ͷλΠϛϯά

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ϕʔεΠϝʔδ

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ϕʔεΠϝʔδ $01:"%%

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%%

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%% 36/

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36/ tar app/testdata app/.wh.large_ﬁle app/a.txt app/b.txt

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ϨΠϠʔ͸ ࠩ෼ͷϑΝΠϧΛ࣋ͭtar

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࡟আ͸.wh.͔Β࢝·Δ whiteoutϑΝΠϧΛ࡞Δ͚ͩ

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ίϚϯυΛލ͍Ͱ࡟আͯ͠΋ ࢒Γଓ͚Δ

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ϨΠϠʔ͸ ਌ͷࢀরΛ͚ͩΛ࣋ͭ

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୯ҰΠϝʔδͷ৔߹

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%% 36/

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ෳ਺Πϝʔδͷ৔߹

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%% 36/ $01:"%% 36/ $01:"%%

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Build Cache ͷ ϝΧχζϜ

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%% 36/ $01:"%% 36/ $01:"%% ίϐʔͨ͠಺༰Ͱ ίϚϯυ͕มΘΔ

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%% 36/ $01:"%% 36/ $01:"%% ίϐʔͨ͠಺༰Ͱ ίϚϯυ͕มΘΔ ڞ௨ͷ਌Λ࣋ͭಉ͡ίϚϯυͷΠϝʔδͰ ࠷৽ͷ΋ͷΛΩϟογϡͱͯ͠༻͍Δ

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ϕʔεΠϝʔδ $01:"%% ϕʔεΠϝʔδ 36/ $01:"%% 36/ $01:"%% 36/ $01:"%% ίϐʔͨ͠಺༰Ͱ ίϚϯυ͕มΘΔ ڞ௨ͷ਌Λ࣋ͭಉ͡ίϚϯυͷΠϝʔδͰ ࠷৽ͷ΋ͷΛΩϟογϡͱͯ͠༻͍Δ Dockerd

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άϥϑͱͯ͠ ঢ়ଶΛ͍࣋ͬͯΔͷ͸ dockerd

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Agenda • docker buildͷ࿩ • CI ʹ͓͚Δdocker build • docker buildʹඞཁͩͬͨ΋ͷ

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CI্Ͱdocker build cache͕ޮ͔ͳ͍

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ͳͥͳΒ dockerd͕ͣͬͱੜ͖͍ͯΔ Θ͚Ͱ͸ͳ͍͔Β

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ڞ௨ͷ਌Λ࣋ͭ ΠϝʔδͳͲ͍ͳ͍

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ղܾࡦ

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docker pullͯ͘͠Δ

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લʹbuildͨ͠ ΠϝʔδΛpull͓͚ͯ͠͹ cache͕ޮ͘?

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͍͍͑

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֎෦͔Β͖࣋ͬͯͨΠϝʔδ ͸ —cache-from͕ͳ͍ͱର৅֎

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͜ΕͰղܾʂ

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ͦΜͳ࣌୅͕͋Γ·ͨ͠

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ࠓ͸ େmulti stage build࣌୅

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աڈͷৗࣝ͸ (෦෼తʹ)௨༻͠ͳ͍

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εςʔδ͝ͱʹ Πϝʔδ͕࡞ΒΕΔ

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Dockerﬁle Stage 1 Stage 2 Stage 3

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Ұ౓ͷbuildͰ࡞ΕΔͷ͸ 1Πϝʔδ͚ͩ

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Dockerﬁle Stage 1 Stage 2 Stage 3 —target

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cacheͷ࠷খ୯Ґ͕ Πϝʔδ

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ಛఆͷεςʔδΛ cacheΛޮ͔ͤͯbuild͢Δ ͨΊʹ͸ Ҏલͷεςʔδ͕શͯඞཁ

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શ෦pull શ෦cache-from

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docker pull application:build-base-cache || true docker build -t application:build-base-cache --target=build-base --cache- from=application:build-base-cache . docker pull application:base-cache || true docker build -t application:base-cache --target=base --cache-from=application:build-base- cache,application:base-cache . docker pull application:app-build-cache || true docker build -t application:app-build-cache --target=app-build --cache- from=application:build-base-cache,application:base-cache,application:app-build-cache . docker pull application:app-base-cache || true docker build -t application:app-base-cache --target=app-base --cache- from=application:build-base-cache,application:base-cache,application:app-build- cache,application:app-base-cache . docker pull application:application-cache || true docker build -t application:application-cache --target=application --cache- from=application:build-base-cache,application:base-cache,application:app-build- cache,application:app-base-cache,application:application-cache .

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߇͑Ίʹ͍ͬͯ ஍ࠈ

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Agenda • docker buildͷ࿩ • CI ʹ͓͚Δdocker build • docker buildʹඞཁͩͬͨ΋ͷ

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ඞཁͩͬͨ΋ͷ͸ͳʹ͔

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docker buildҎ֎ͷ πʔϧΛݟͯΈΔ

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uber/makisuͷ࿩

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makisu͸ Uber͕࡞ͬͨbuilder

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https://eng.uber.com/makisu/

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2015೥͘Β͍͔Β DockerҠߦΛ࢝ΊͨUber

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Apache MesosͱK8S

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400αʔϏε͘Β͍

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docker buildͷprocess ࣗಈԽ, ඪ४Խ

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ػີ৘ใͷऔѻʹ·ͣࠔͬͨ

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docker-squashͰղܾʂ

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͔͠͠ build͕࣌ؒ2ഒʹ

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࢖͍෺ʹͳΒͳ͍ͷͰ dockerΛfork͢Δ͜ͱʹ

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build࣌ʹ volumeΛmountͰ͖ΔΑ͏ʹ

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େຬ଍

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2017೥ 3000αʔϏε·Ͱ੒௕

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buildʹ2͔͔࣌ؒΓ 10GBΛ௒͑ΔΠϝʔδ΋

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storage, ଳҬ, ੜ࢈ੑʹ μϝʔδ

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εέʔϧ͢Δ ࣍ੈ୅ͷϏϧυʹ͍ͭͯߟ͑Δ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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2017೥ʹ͸ ࣗಈԽ͞Ε, εέʔϥϒϧͰ ޮ཰తͳΠϯϑϥ͕͋ͬͨ

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Docker build΋ ͦͷ্Ͱಈ͔͔ͨͬͨ͠

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docker build͸ copy-on-writeͰࠩ෼Λ ͍Ζ͍Ζ΍͍ͬͯΔͷͰ ڧ͍ݖݶ͕ඞཁ

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ڧ͍ΫϥελͰ ηΩϡϦςΟ໰୊͸ ճආ͍ͨ͠

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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LayerCacheͰ લճͷLayerΛ࢖͍ճͤΔͱ build࣌ؒΛ୹͘Ͱ͖Δ

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Dockerͷcache͸ ϒϥϯνؒ΍ผαʔϏεͩͱ ޮ͔ͳ͍

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build machineͷׂ౰Ͱ cache hit཰Λ޲্͕ͤͨ͞ ෳࡶ౓্͕͕ͬͯ͠·ͬͨ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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খ͍͞Πϝʔδ͸ ࠷ߴ

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storage network decompress ʹޮ͘

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multi stage build͸ ྑ͍ղܾࡦ

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͔͠͠ Dockerﬁle͕ෳࡶʹͳΔ

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ͦͷ΄͔ʹ΋ layerΛ·͍ͨͰ࡟আ͍ͯ͠Δ ΠϝʔδͳͲ΋͋ͬͨ

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makisu͸ 3ͭͷ໰୊Λղܾ͢Δ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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makisu͸ copy on writeΛ࢖Θͣ In Memory FSͰࠩ෼ΛऔΔ ৄ͘͠͸ޙड़

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ऄ଍

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Docker͸layerͷѹॖʹ GoͷgzipΛ࢖͍ͬͯΔ͕ pgzipͷ΄͏͕଎͍ͷͰ makisu͸ͦͬͪ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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Redis(or FS or HTTP)ʹ digestͱRegistryͷ ώϞ෇͕͋Γ Cache͕ղܾ͞ΕΔ

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ϙʔλϒϧ ෼ࢄΩϟογϡ αΠζ࠷దԽ

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ಠࣗͷDockerﬁle parserΛ ࢖ͬͯ ໌ࣔతʹϨΠϠʔΛ࡞Δ ػߏ͕͋Δ

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Stage FROM image [AS stage] RUN apk add ca-certiﬁcates COPY package.json . COPY package-lock.json . ENV NODE_ENV=production RUN npm ci #!COMMIT COPY . . RUN npm run build

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Stage FROM image [AS stage] RUN apk add ca-certiﬁcates COPY package.json . COPY package-lock.json . ENV NODE_ENV=production RUN npm ci #!COMMIT COPY . . RUN npm run build

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͜ͷػߏ͕͋Ε͹ػີ৘ใΛ COPYͨ͋͠ͱʹ࡟আͯ͠ COMMITΛ͢Δͱ͍͏ࣄ͕ Dockerﬁle͚ͩͰ࣮ݱՄೳ

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kaniko

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kaniko͸ Google͕࡞ͬͨbuilder

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ίϯςφ্Ͱಈ͘

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͜Ε·Ͱίϯςφ্Ͱͷ buildͬͯͲ͏ͯͨ͠ͷʁ

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Privileged Container EPDLFSDMJ EPDLFSE HTTP

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Container EPDLFSDMJ EPDLFSE HTTP Host

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Container EPDLFSDMJ EPDLFSE HTTP Remote

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kaniko

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Container LBOJLP SPPUGT

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Container LBOJLP SPPUGT 4($4 State &$3($3 Layer Cache

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Container LBOJLP SPPUGT 4($4 State &$3($3 Layer Cache exec

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Container LBOJLP SPPUGT 4($4 State &$3($3 Layer Cache exec snapshot

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Container LBOJLP SPPUGT 4($4 State &$3($3 Layer Cache exec snapshot

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Container LBOJLP 4($4 State &$3($3 SPPUGT &$3($3 Layer Cache Image exec snapshot Registry

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ঢ়ଶΛ ίϯςφ಺෦ʹ࣋ͨͳ͍

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Image୯ҐͰͷ Pull/CacheͰ͸ͳ͘ Layer୯Ґ

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BuildͱCacheͷߋ৽͕ ಉ࣌ʹߦΘΕΔ

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Multi Stage Build Ͱ΋Cache͕ޮ͘

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Image͸ઈରPush͢Δ

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ίϯςφΛ࢖ͬͨ Build/Pushʹద͍ͯ͠Δ

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kanikoʹ͍ͭͯৄ͘͠͸ kaniko ͕ԿΛ͍ͯ͠Δ͔, Կ͕Ͱ͖Δ͔ https://orisano.hatenablog.com/entry/2019/05/20/120032