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コンテナを雰囲気で動かさない話
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Ryo Tomidokoro
June 15, 2018
Programming
5.5k
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コンテナを雰囲気で動かさない話
PHPカンファレンス福岡2018前夜祭リジェクトコン
Ryo Tomidokoro
June 15, 2018
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Transcript
ίϯςφΛงғؾͰಈ͔͞ͳ͍ 1)1ΧϯϑΝϨϯεԬલࡇϦδΣΫτίϯ *OOPWBUPS+BQBO*OD ॴ྄ &OHJOFFS
ͬͦ͘͞Ͱ͕͢
ίϯςφΛงғؾͰͬͯ·ͤΜ͔ʁ
DockerΛͬͨ։ൃ ίϯςφͷৄࡉΒͳͯ͘ग़དྷΔ
ڥߏங docker-compose.yml
docker-compose up -d ։ൃڥߏங͕Ұॠ…
docker-compose down ࠔͬͨΒ্ཱͪ͛͠ docker-compose up -d
͜ͷ··ͰΞϗʹͳΔʂ ຊΛಡΜͰίϯςφʹೖͩ
ίϯςφԾԽɺαʔόʔԾԽͰͳ͍ɻ Α͋͘Δίϯςφೖॻͷಋೖ෦
ผʹαʔόʔԾԽͷ͜ͱʹৄ͘͠ͳΓ͍ͨΘ ͚Ͱͳ͍ͷ͕ͩ…
ίϯςφͱΧʔωϧͷఏڙ͢ΔػೳʹΑͬͯ ࣮ߦڥ͕͞ΕͨͦΕͧΕͷϢʔβۭؒͷ ͜ͱͰ͋Δɻ -> ͜͏͍͏આ໌͚ͩͩͱϐϯͱ͜ͳ͍ Α͋͘Δίϯςφೖॻͷಋೖ෦
݁ہɺίϯςφ͕Α͔͘Βͳ͍
ਅ໘ͳ શһ͕ৄࡉΛ͠Βͳͯ͘ଟ͍͍ நతʹѻ͑ΔͳΒͦΕ͍͍
ͰɺࢲΓ͍ͨ Ͳ͏ͳ͍ͬͯΔͷ͔ཧղ͍ͨ͠
ͦ͜ͰࣗͳΓʹௐͨ
chroot 1979 ~ unshare 2.14~ nsenter 2.6.24~ cgroups 2.6.24~ ԶௐʹΑΔίϯςφͷਖ਼ମ
※LinuxͷίϚϯυͰ͢ɻ
Ҏ্Ͱ͢… ͱ͍͏ͷڐ͞Εͳ͍ͱࢥ͏ͷͰɻ ྫΛަ͑ͯɺͳΔ͘ฏқʹઆ໌͠·͢ɻ
ྫ͑ɺ `alpine linux` ίϯςφ tarͷதʢൈਮ)
ͯ͞ɺ͜Ε͕Ͳ͏ͬͯಈ͘ͷ͔ʁ
chroot ͍͖ͳΓίϯςφ
ͨͩ͠ɺ͜Ε͚ͩͩͱ͕ෆे ↑ϗετͷϓϩηεΛpkillͰ͖ͪΌ͏
unshare namespaceΛ࡞ͯ͠ɺϓϩηεΛ
cgroups /sys/fs/cgroupԼͰઃఆΛݟΕΔ ϓϩηεάϧʔϓͷϦιʔεར༻Λִɾ੍ݶ
unshare͞ΕͨϓϩηεʹೖΕΔ `name space enter` `docker exec` ͱ͔ʹΘΕ͍ͯΔͱࢥ͏ nsenter
ίϯςφΛ࣮ݱ͢Δ4ίϚϯυ جຊ chroot ϓϩηεΛ unshare Ͱ ϦιʔεΛ cgroup Ͱ nsenter
Ͱͨ͠ϓϩηεʹ৵ೖ
جຊ chroot Linux͔ΒɺLinuxͰ࣮ߦՄೳͳϑΝΠϧΛ࣮ߦ
྆ํLinux͔ͩΒ࣮ߦͰ͖Δ LinuxΧʔωϧͷABI Application Binary Interface ݫ֨ͳޙํޓੑ
Ұݟ alpinelinux ͕ԾOSͷΑ͏ʹݟ͑Δ ࣮ଶϓϩηε࣮ߦ
ɹchrootdocker ࣮ߦ࣌ʹɺඞͣίϚϯυΛࢦఆ docker run -it alpine:latest sh ͦ͏͍͏͜ͱͩͬͨͷ͔…
ίϯςφग़ͨͯͷ͜Ζ ୡਓ͕͓ͨͪͬ͠Όͬͯ·ͨ͠ɻ ʮίϯςφͬͯ chrootͩΑͶʯͱ Α͏͘…ҙຯΛཧղͰ͖·ͨ͠
͔͠͠ɺผͷ͕༙͍ٙͯ͘Δ
Docker For Mac ʁ Docker For Windows ? MacɺWindowsLinux͡Όͳ͍
ͳΜͰ Dockerಈ͘ͷʁ
Docker for Mac Windowsͷ߹ಉ༷ LinuxKitͱ͍͏ίϯςφ༻Linux্Ͱಈ࡞
ྫ͑ MacͷClangͰ HelloWorldͷ࣮ߦϑΝΠϧΛ࡞ Linuxίϯςφ্Ͱ࣮ߦ -> ಈ͔ͳ͍ɻ Linux͡Όͳ͍͔Βɻ
UbuntuͰ HelloWorldͷ࣮ߦϑΝΠϧΛ࡞ DockerͰ࣮ߦ -> ಈ͘
Linux -> Linuxͷ࣮ߦՄೳϑΝΠϧ -> ಈ͘ Linux -> OSXͷ࣮ߦՄೳϑΝΠϧ -> ಈ͔ͳ͍
ཧ۶୯७
LXCͱ͔LibContainerͱ͔runCͱ͔ Containerdͱ͔৭ʑมΘ͍ͬͯͬͯΔ͕ جຊมΘΒͳ͍ɻ
͜͜·ͰΛཧղ͢Ε DockerͰಈ࡞͢Δ Windowsίϯςφ͕ແ͍ཧ༝ OSXίϯςφ͕ແ͍ཧ༝ શʹ͔Γ·͢ΑͶʁ
ίϯςφ Linux ͔Β Linuxͷ࣮ߦՄೳϑΝΠϧΛಈ͔ٕ͢ज़͔ͩΒ
͕࣌ؒ༨ͬͯͨΒDEMO
Ҏ্ɺ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ