昔の自分に伝えたい容量回復のためのDockerの仕組み / docker_tips

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ੲͷࣗ෼ʹ఻͍͑ͨ ༰ྔճ෮ͷͨΊͷ Docker ͷ࢓૊Έ ksk1030 @Repro Tech Meetup #1 / 2018.07.27

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ࠓ೔ͷ·ͱΊ

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ɹimage → ϓϩάϥϜ ɹcontainer → ϓϩηε ɹvolume → ετϨʔδ ɹ˞ࣗ෼ͳΓʹཧղΛਐΊΔͨΊͷࡶͳ੔ཧͰ͢…

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Dockerͱͷग़ձ͍

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DockerΛ࢖͍࢝Ίͨ͜Ζ ୭͔͕docker-compose.ymlʹ ͓·͡ͳ͍Λॻ͍ͯ͘Εͨʂ Ͱ΋࢖ͬͯΔͱͲΜͲΜ ༰ྔ৯͏Μ͚ͩͲ…ʁ Α͘Θ͔ΒΜ͚Ͳศརʂ ؀ڥߏஙḿΔʂ

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DockerΛ࢖͍࢝Ίͨ͜Ζ ୭͔͕docker-compose.ymlʹ ͓·͡ͳ͍Λॻ͍ͯ͘Εͨʂ Ͱ΋࢖ͬͯΔͱͲΜͲΜ ༰ྔ৯͏Μ͚ͩͲ…ʁ Α͘Θ͔ΒΜ͚Ͳศརʂ ؀ڥߏஙḿΔʂ Կ͕ى͖͍͔ͯͨ ɾ్த͔ΒJoinͨ͠ϓϩδΣΫτͰDocker͕ ɹ࢖ΘΕ͍ͯͨ ɾͱΓ͋͑ͣ docker-compose up ɾͦͯ͠ѹഭ͞ΕΔετϨʔδ…

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DockerΛ࢖͍࢝Ίͨ͜Ζ ୭͔͕docker-compose.ymlʹ ͓·͡ͳ͍Λॻ͍ͯ͘Εͨʂ Ͱ΋࢖ͬͯΔͱͲΜͲΜ ༰ྔ৯͏Μ͚ͩͲ…ʁ Α͘Θ͔ΒΜ͚Ͳศརʂ ؀ڥߏஙḿΔʂ ରԠ͸ʁ ɾάάΕ͹ରॲ๏͸ग़ͯ͘Δ͕ ɾimageʁ containerʁ volumeʁ ɾத਎Λཧղ͠ͳ͍··ίϚϯυΛୟ͘ …

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DockerΛ࢖͍࢝Ίͨ͜Ζ ୭͔͕docker-compose.ymlʹ ͓·͡ͳ͍Λॻ͍ͯ͘Εͨʂ Ͱ΋࢖ͬͯΔͱͲΜͲΜ ༰ྔ৯͏Μ͚ͩͲ…ʁ Α͘Θ͔ΒΜ͚Ͳศརʂ ؀ڥߏஙḿΔʂ ରԠ͸ʁ ɾάάΕ͹ରॲ๏͸ग़ͯ͘Δ͕ ɾimageʁ containerʁ volumeʁ ɾத਎Λཧղ͠ͳ͍··ίϚϯυΛୟ͘ … த਎Λཧղ্ͨ͠Ͱରॲ͍ͨ͠

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ͦΕͧΕͷػೳ

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ɹimage Λ pull / build ͯ͠ ɹcontainer ͱ࣮ͯ͠ߦ͢Δ ɹvolume ͸σʔλӬଓԽʹ ɹ ࢖ΘΕΔಛघσΟϨΫτϦ

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Πϝʔδ͠΍͘͢੔ཧ͢Δͱ

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ɹimage → ϓϩάϥϜ ɹcontainer → ϓϩηε ɹvolume → ετϨʔδ ɹ˞ࣗ෼ͳΓʹཧղΛਐΊΔͨΊͷࡶͳ੔ཧͰ͢…

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image ɾ࣮ߦՄೳͳܗͰ·ͱΊΒΕͨύοέʔδ ɾΑ͘࢖ΘΕΔ΋ͷ͸ Docker Hub ͱ͍͏ ɹαΠτ͔Βμ΢ϯϩʔυͰ͖Δ (docker pull) ɹ- nginx / redis / mysql … ɾࣗ෼Ͱ࡞੒͢Δ͜ͱ΋Ͱ͖Δ (docker build)

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image # Ұཡදࣔ  $ docker images -a # ࢦఆͯ͠࡟আ $ docker rmi [image] # ࢖ͬͯͳ͍΋ͷ·Δͬͱ࡟আʢv1.2.5 Ҏ߱ʣ $ docker image prune

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container ɾಈ͍͍ͯΔϓϩάϥϜͷ࣮ମ ɾimage Λ࣮ߦ͢Δ͜ͱͰੜ੒͞ΕΔ ɾϓϩάϥϜΛ࣮ߦͯ͠ϓϩηε͕૸Δɺతͳ

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container # Ұཡදࣔ  $ docker images -a # ࢦఆͯ͠ఀࢭɺ࡟আ $ docker stop [container] $ docker rm [container] # ࢖ͬͯͳ͍΋ͷ·Δͬͱ࡟আʢv1.2.5 Ҏ߱ʣ $ docker container prune

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volume ɾෳ਺ͷίϯςφ͔ΒࢀরͰ͖Δಛघͳ ɹσΟϨΫτϦ ɾϓϩηεؒͰڞ༗͍ͨ͠σʔλ ɹ- ม਺Ͱ͸ͳ͘ετϨʔδͷΑ͏ͳ ɾvolumeΛհͯ͠σʔλΛϩʔΧϧʹ࣋ͭ͜ͱ ɹͰ container ͕ফ͑ͯ΋σʔλ͸อ࣋

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container # Ұཡදࣔ  $ docker volume ls # ࢦఆͯ͠ఀࢭɺ࡟আ $ docker volume rm [volume] # ࢖ͬͯͳ͍΋ͷ·Δͬͱ࡟আʢv1.2.5 Ҏ߱ʣ $ docker volume prune

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ͭ·Γ݁ہ ɾ·ͣ container Λఀࢭ&࡟আ ɾ͍࣍Ͱ image / volume Λ࡟আ ɹ- volume ͸ container ͷ࡟আ࣌ʹ -v Ͱ΋ ɾγεςϜͷ࿩Ͱݴ͑͹… ϓϩηεΛ kill ͔ͯ͠ΒϓϩάϥϜͷ ϑΝΠϧ΍DBΛ࡟আ͢Δɺͱ͍͏࿩

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ͪͳΈʹ ɾDocker for mac ࢖ͬͯΔͱ Docker.qcow2 ɹͱ͍͏ϑΝΠϧ͕ංେԽ͢Δ ɾ࡟আͳΓѹॖͳΓͪ͜Β΋ཁରԠ ɹ- v1.13 Ҏ߱͸ఆظతʹѹॖ͞Ε͍ͯΔʢʁʣ # ஔ͍ͯ͋ΔσΟϨΫτϦ $ ll ~/Library/Containers/com.docker.docker/ Data/com.docker.driver.amd64-linux/ Docker.qcow2

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݁࿦

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ͪΌΜͱυΩϡϝϯτಡΉ΂͠ https://docs.docker.com/

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ࣗݾ঺հ ɾKeisuke Nakatane (@ksk1030) ɾORSO Inc. ৽نࣄۀ։ൃࣨ ɾαʔόɿΞϓϦɿϑϩϯτ ʹɹ̓ɹɿɹ̍ɹɿɹ̎ɹɹ͘Β͍ ɾલ৬͸ژ౎ͷήʔϜ԰Ͱਓࣄ ɾΤϯδχΞੵۃ࠾༻தʂʂ

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Thank you for listening !!