Better Docker Image - Speaker Deck

Better Docker Image

by Recruit Technologies

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Better Docker Image Container Build Meetup #1 #container_build @orisano

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ྑ͍Docker Imageͱ͸Կ͔

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αʔϏεʹؔΘΔਓΛ ޾ͤʹ͢ΔΠϝʔδ

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ݟͯΘ͔Γ΍͍͢ खݩͰߴ଎ʹbuild͞ΕΔ CI্Ͱߴ଎ʹbuild͞ΕΔ ߴ଎ʹdeploy͞ΕΔ

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ࠓ೔࿩͍ͨ͜͠ͱ

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ͲͷΑ͏ʹ଎͘͢Δ͔ ͲͷΑ͏ʹখ͘͢͞Δ͔

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ͲͷΑ͏ʹ଎͘͢Δ͔ ͲͷΑ͏ʹখ͘͢͞Δ͔

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ͲͷΑ͏ʹ଎͘͢Δ͔ • ΠϝʔδΛখ͘͢͞Δ • ίϚϯυͦͷ΋ͷΛ଎͘͢Δ • cacheΛޮ͔ͤΔ • ґଘͷͳ͍εςʔδΛฒྻͰ࣮ߦ͢Δ • ඞཁͳ͍εςʔδΛbuild͠ͳ͍

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ͲͷΑ͏ʹ଎͘͢Δ͔ • ΠϝʔδΛখ͘͢͞Δ • ίϚϯυͦͷ΋ͷΛ଎͘͢Δ • cacheΛޮ͔ͤΔ • ґଘͷͳ͍εςʔδΛฒྻͰ࣮ߦ͢Δ • ඞཁͳ͍εςʔδΛbuild͠ͳ͍

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imageΛখ͘͢͞Δͷ͸ docker push͢Δͱ͖ͷ଎౓ docker pull͢Δͱ͖ͷ଎౓ ͷߴ଎Խʹͭͳ͕Δ

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Ͳͷ༷ʹখ͘͢͞Δ͔͸ ͋ͱͰ

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ͲͷΑ͏ʹ଎͘͢Δ͔ • ΠϝʔδΛখ͘͢͞Δ • ίϚϯυͦͷ΋ͷΛ଎͘͢Δ • cacheΛޮ͔ͤΔ • ґଘͷͳ͍εςʔδΛฒྻͰ࣮ߦ͢Δ • ඞཁͳ͍εςʔδΛbuild͠ͳ͍

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ίϚϯυͦͷ΋ͷΛ଎͘͢Δ

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URLʹର͢ΔADDΛ࢖Θͳ͍ RUNͷத਎Λ଎͘͢Δ

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URLʹର͢ΔADDΛ࢖Θͳ͍ RUNͷத਎Λ଎͘͢Δ

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URLʹର͢ΔADD͸ جຊతʹμ΢ϯϩʔυ͢Δ

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஗͍

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ΞΫηε͍ͯ͠Δઌͷ ίϯςϯπ͕ႈ౳ͳΒ wget + gzip + tarͰे෼

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`RUN wget`ʹ͢Δ͜ͱͰ cache͕ޮ͘

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ႈ౳Ͱͳ͍Ϧιʔεʹ ґଘ͢ΔͷΛۃྗ΍ΊΔ

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URLʹର͢ΔADDΛ࢖Θͳ͍ RUNͷத਎Λ଎͘͢Δ

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GitHub͔Β࣮ߦϑΝΠϧΛ curl or wgetͰऔಘ͢Δ ͕஗͍

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Ͳ͏ʹ͔଎͘Ͱ͖ͳ͍͔ curl -vvvΛ͏ͬͯΈͨ

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GitHub Release͸S3Ͱ͋Δ S3͸Accept-Ranges: bytes ͱ͍͏͜ͱ͕Θ͔ͬͨ

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Accept-Ranges: bytes ͬͯͳΜͩΖ͏

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RFC7233, Range Requests ൣғΛࢦఆͯ͠ downloadͰ͖Δ

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ͭ·Γ ฒྻμ΢ϯϩʔυ͕Մೳ

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github.com/orisano/rget

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؀ڥʹΑΓ·͕͢ 5min -> 2min

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Dockerﬁleͷ޻෉Ҏ֎ʹ΋ ଎͘͢ΔΞϓϩʔν͸͋Δ

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ͲͷΑ͏ʹ଎͘͢Δ͔ • ΠϝʔδΛখ͘͢͞Δ • ίϚϯυͦͷ΋ͷΛ଎͘͢Δ • cacheΛޮ͔ͤΔ • ґଘͷͳ͍εςʔδΛฒྻͰ࣮ߦ͢Δ • ඞཁͳ͍εςʔδΛbuild͠ͳ͍

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cacheΛޮ͔ͤΔ

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docker build͢ΔϚγϯ͕ ಉҰͷ৔߹ ಉҰͰͳ͍৔߹

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docker build͢ΔϚγϯ͕ ಉҰͷ৔߹ ಉҰͰͳ͍৔߹

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cacheͷ࢓૊ΈΛཧղ͢Δ

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RUN͸ จࣈྻ͕มΘΒͳ͍ݶΓ جຊతʹcache͞ΕΔ

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COPY, ADD͢ΔϑΝΠϧͷ ಺༰͕มΘͬͨ৔߹ Ҏ߱ͷRUNͷcache͕ഁغ

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ͳͷͰ lockﬁleͳͲΛઌʹίϐʔͯ͠ install͚ͩͯ͠cacheͤ͞Δ

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docker build͢ΔϚγϯ͕ ಉҰͷ৔߹ ಉҰͰͳ͍৔߹

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CI্Ͱbuild͢Δͱ͖ͳͲ cache͕ͳ͍͜ͱ͕ଟ͍

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docker save & load or docker pull docker build —cache-from Λ࢖͏

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image͕େ͖͍/layer͕ଟ͍ ৔߹ buildͷ΄͏͕ૣ͍͜ͱ΋͋Δ

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image͕େ͖͍/layer͕ଟ͍ ৔߹ buildͷ΄͏͕ૣ͍͜ͱ΋͋Δ ܭଌܾͯ͠ΊΔ

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ͲͷΑ͏ʹ଎͘͢Δ͔ • ΠϝʔδΛখ͘͢͞Δ • ίϚϯυͦͷ΋ͷΛ଎͘͢Δ • cacheΛޮ͔ͤΔ • ґଘͷͳ͍εςʔδΛฒྻͰ࣮ߦ͢Δ • ඞཁͳ͍εςʔδΛbuild͠ͳ͍

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ґଘͷͳ͍εςʔδΛ ฒྻͰ࣮ߦ͢Δ

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buildkitΛ࢖͍ͬͯͩ͘͞ʂ github.com/moby/buildkit export DOCKER_BUILDKIT=1

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ͲͷΑ͏ʹ଎͘͢Δ͔ • ΠϝʔδΛখ͘͢͞Δ • ίϚϯυͦͷ΋ͷΛ଎͘͢Δ • cacheΛޮ͔ͤΔ • ґଘͷͳ͍εςʔδΛฒྻͰ࣮ߦ͢Δ • ඞཁͳ͍εςʔδΛbuild͠ͳ͍

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ඞཁͳ͍εςʔδΛ build͠ͳ͍

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—targetΛ࢖͑͹Α͍ͷͰ͸ʁ

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—target͸ ࢦఆͨ͠εςʔδҎલΛ શ෦build͢Δ

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multi stage buildΛ ౿ΈࠐΜͩ࢖͍ํ͍ͯ͠Δͱ ૺ۰͕ͪ͠

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͓ͦΒ͘buildkitͰͰ͖Δ͕ buildkit͕࢖͑ͳ͍৔߹ʹ

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github.com/orisano/targd • DockerﬁleͷASTΛऔಘ • ࢦఆ͞ΕͨεςʔδͷґଘεςʔδΛநग़ • ґଘεςʔδ͚ͩͷDockerﬁleΛग़ྗ

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github.com/orisano/targd

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ͲͷΑ͏ʹ଎͘͢Δ͔ ͲͷΑ͏ʹখ͘͢͞Δ͔

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ͲͷΑ͏ʹখ͘͢͞Δ͔ • multi stage buildΛ࢖͏ • RUNΛ·ͱΊΔ(?) • ͳͥେ͖͍͔Λ஌Δ

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ͲͷΑ͏ʹখ͘͢͞Δ͔ • multi stage buildΛ࢖͏ • RUNΛ·ͱΊΔ(?) • ͳͥେ͖͍͔Λ஌Δ

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multi stage buildΛ࢖͏

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multi stage buildͰ ͋Γ͕ͪͳٙ໰

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࠷ऴతͳΠϝʔδ͕ খ͘͞ͳΔ͔Β ͦΕ·Ͱͷεςʔδ͸ ࠷దԽ͠ͳͯ͘ྑ͍ʁ

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ݸਓతʹ͸No

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moby/issues/34715 —cache-formͩͱ multi stage buildͷ લஈͷεςʔδͷcache͕ ޮ͔ͳ͍

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࠷ऴεςʔδ͔͠ pushͯ͠ͳ͍͔Β౰ͨΓલ

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CI্Ͱͷbuild͸ —cache-fromΛ࢖͏ ࠷ऴεςʔδ͚ͩcache͢Δ ҙຯ͸ͳ͍

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multi stage build࣌ʹ cacheΛޮ͔͍ͤͨ৔߹͸ લͷεςʔδ΋ ໌ࣔతʹpush͢Δ͔͠ͳ͍

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݁ہpush͢ΔͷͰ push/pullͷίετ͕͔͔Δ ͢΂ͯͷεςʔδΛฏ౳ʹ খ͘͢͞΂͖ (ݸਓͷݟղͰ͢)

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ͲͷΑ͏ʹখ͘͢͞Δ͔ • multi stage buildΛ࢖͏ • RUNΛ·ͱΊΔ(?) • ͳͥେ͖͍͔Λ஌Δ

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RUNΛ·ͱΊΔ(?)

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Ͳ͔ͬʔ;͍͊Δ͸ 1ͭͷRUNʹ શ෦ॻ͘ͱྑ͍Β͍͠(?)

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github.com/orisano/minid • DockerﬁleͷASTΛऔಘ • ࿈ଓ͢ΔRUN, COPY, ADDΛ࿈݁͢Δ • ݁ՌͷDockerﬁleΛग़ྗ

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github.com/orisano/minid

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αΠζ͕খ͘͞ͳͬͨ

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Ͱ΋ͳΜͰʁ

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ϨΠϠʔͷΦʔόʔϔου͕ ݮΔ͔Βখ͘͞ͳΔʁ

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͍͍͑

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·ͣ Ͳ͏͍͏ܗͰอଘ͞ΕͯΔ͔ Λ஌Δ

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moby/image/spec/v1.md

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AUFS

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http://docs.docker.jp/engine/userguide/storagedriver/aufs-driver.html

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࡟আ͸ whiteoutϑΝΠϧͷ௥Ճ Ҡಈ͸ opaqueϑΝΠϧͷ௥Ճ ʴ ҠಈઌͷϑΝΠϧࠩ෼

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Ұ౓Ͱ΋ RUN,COPY,ADDΛލ͙ͱ imageʹ͸࢒ͬͯ͠·͏

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ػցతʹͰ΋ ҰͭͷRUNʹ·ͱΊΔ͜ͱͰ ༨ܭͳ΋ͷΛ࡟ݮͰ͖Δ

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1ͭͷϨΠϠʔʹ ·ͱΊΔ͜ͱ͸ ຊ౰ʹਖ਼͍͠ͷ͔

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ϨΠϠʔΛผ͚Δ͜ͱʹΑΓ ฒྻμ΢ϯϩʔυͷԸܙ cacheͷ༗ޮ׆༻ Մಡੑͷ޲্

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ϨΠϠʔΛผ͚Δ͜ͱʹΑΓ ฒྻμ΢ϯϩʔυͷԸܙ cacheͷ༗ޮ׆༻ Մಡੑͷ޲্ ܭଌܾͯ͠ΊΔ

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ͱ͸͍͑ ෳ਺ϨΠϠʔʹ ލ͕Βͳ͍ఔ౓ʹ ෼ׂ͢Δͷ͕ྑͦ͞͏

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ͲͷΑ͏ʹখ͘͢͞Δ͔ • multi stage buildΛ࢖͏ • RUNΛ·ͱΊΔ(?) • ͳͥେ͖͍͔Λ஌Δ

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ͳͥେ͖͍͔Λ஌Δ

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͍͔ͳΔνϡʔχϯάͰ΋ ܭଌͤͣʹ΍ͬͯ͸͍͚ͳ͍

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docker history

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docker history

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ͲͷϨΠϠʔ͕ େ͖͍͔͸Θ͔Δ͚Ͳ ͳͥେ͖͍͔͸෼͔ΓͮΒ͍

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ҙ֎ʹίϚϯυ͕ Ͳ͏͍͏ϑΝΠϧΛ࡞Δͷ͔ ஌Βͳ͍

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github.com/orisano/dlayer • docker saveͰಘΒΕͨtarΛղੳ • layerͱcmdͷରԠΛͱΔ • layerͷࠩ෼ΛϑΝΠϧαΠζ͕େ͖͍ॱʹද ࣔ

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github.com/orisano/dlayer

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࣮ࡍʹdlayerΛ࢖ͬͯ golangެࣜalpineΠϝʔδͷ αΠζΛݮΒͯ͠Έͨ

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docker-library/golang/pull/232

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golang:1.11͔Βtoolchainͷ αΠζ͕Ͱ͔͘ͳͬͨ SSAͰͷ࠷దԽ͕૿͔͑ͨΒʁ

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1.10: 253MB

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1.11: 305MB

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࡞ͬͨπʔϧ • github.com/orisano/rget • github.com/orisano/targd • github.com/orisano/minid • github.com/orisano/dlayer • ྑ͍ͱࢥͬͨΒελʔ͍͚ͯͨͩ͠ΔͱྭΈʹͳΓ·͢

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·ͱΊ • ίϚϯυΛ଎͘Ͱ͖ͳ͍͔ߟ͑Δ • cacheΛཧղͯ͠༗ޮʹ׆͔͢ (CI or ϩʔΧϧ) • multi stage buildΛ࢖͏ (ॏ͍stageΛcache͢Δ) • layerΛখ͘͢͞ΔͨΊʹ෼ੳ͢Δ • buildkitΛ࢖͏!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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rget͜΅Ε࿩

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github.com/orisano/rget

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Ͱ΋ ͜ΕͰຊ౰ʹ͍͍ΜͩΖ͏͔

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rgetͷbinaryΛdownload ͢ΔͷͰ͸ෛ͚ͨؾ͕͢Δ()

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shell͚ͩͰ ࣮ݱͰ͖ͳ͍ͩΖ͏͔

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ϙʔλϒϧੑ͸͍Βͳ͍ͷͰ ओઓ৔ͷalpineʹߜΔ

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alpine(busybox)͸ xargs͕ೖ͍ͬͯΔʂʂʂ

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xargsΛ࢖͏͜ͱͰ ฒྻԽ ಉ࣌઀ଓ਺੍ݶ ͕࣮ݱͰ͖Δ

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GitHub Release͸ ؆୯ʹHEAD͕Ͱ͖ͳ͍ͷͰ GETͰbodyΛແࢹͯ͠ Content-LengthΛऔಘͰ͖Δ

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seqͰ chunkͷrangeΛੜ੒Ͱ͖Δ

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wget͸206 Partial Content ͕͏·͘ѻ͑ͳ͍ͷͰμϝ

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࢓ํͳ͍ͷͰ curl -RͰdownload

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࠷ޙʹcatͯ͠chunkΛ݁߹

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shellͰ΋࣮ݱͰ͖Δʂ

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͔͠͠ curl͸alpineඪ४Ͱ͸ͳ͍

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apk add —no-cache curl ͸ෛ͚ͨؾ͕͢Δ()

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͔͠͠ wget͸206͕ॲཧͰ͖ͳ͍

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ఘΊΒΕͳ͍ͷͰ busyboxͷwgetͷ ιʔείʔυΛಡΉ

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busybox/networking/wget.c

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busybox/networking/wget.c

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-OͰࢦఆͨ͠ϑΝΠϧ͕ଘࡏ (ϑΝΠϧαΠζ͕1Ҏ্) -cΛࢦఆ͍ͯ͠Δ ্هͷ৚݅Λຬͨ͢ͱ͖ 206Λॲཧͯ͘͠ΕΔ