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Write Container Runtime in Go Go Conference 2019 Autumn Koki Tomoshige (@towocy)

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Write Container Runtime in Go

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Write Container Runtime in Go

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ίϯςφϥϯλΠϜʹ͍ͭͯ

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ίϯςφٕज़ ίϯςφϥϯλΠϜͱ ίϯςφΠϝʔδ

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ίϯςφϥϯλΠϜ OCI runtimeʹ४ڌ͍ͯ͠Δ

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OCIʢOpen Container Initiativeʣ ίϯςφٕज़ͷඪ४ن֨Λ ࡞੒͢ΔͨΊͷஂମ

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runtime.me ίϯςφϥϯλΠϜͱͯ͠ͷ ঢ়ଶͱৼΔ෣͍ https://github.com/opencontainers/runtime-spec/blob/master/runtime.md

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Query State state Create create Start start Kill kill Delete delete

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Standard Go Project Layout /cmd https://github.com/golang-standards/project-layout#cmd

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CLI pkg github.com/urfave/cli

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InterfaceͰͷந৅Խ ࢖༻ऀଆ͕ ٻΊΔৼΔ෣͍Λఆٛ͢Δ https://github.com/golang/go/wiki/CodeReviewComments#interfaces

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ίϯςφϥϯλΠϜͷ࣮૷ʹ͍ͭͯ

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ίϯςφϥϯλΠϜ ϗετOS্ͷ Ϧιʔεִ͕཭ɺ੍ݶ͞Εͨϓϩηε

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‘Contain’er ʙΛด͡ࠐΊΔ

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ίϯςφϥϯλΠϜ How to contain a process

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https://employment.en-japan.com/engineerhub/entry/2019/02/05/103000#ίϯςφͱ͸ ΧʔωϧϦιʔεɺϑΝΠϧγεςϜͷִ཭ Namespaceɺchroot/pivot_root ϋʔυ΢ΣΞϦιʔεͷ੍ݶ cgroup ݖݶͷ੍໿ Capabilityɺseccomp

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Fork

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Fork ਌ϓϩηε ࢠϓϩηε

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Fork ਌ϓϩηε ࢠϓϩηε Contain

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Build Constraints ϑΝΠϧ໊Ͱ Ϗϧυର৅Λ෼͚Δ https://golang.org/pkg/go/build/#hdr-Build_Constraints

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Fork ਌ϓϩηε ࢠϓϩηε Contain

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https://github.com/rrreeeyyy/container-internship/tree/master/02#linux-namespaces IPC ϓϩηεؒ௨৴Ͱ࢖͏Ϧιʔε Network ωοτϫʔΫσόΠεɺϧʔςΟϯάςʔϒϧ Mount ϑΝΠϧγεςϜπϦʔ PID ϓϩηε ID User Ϣʔβ IDɺάϧʔϓ ID UTS nodenameɺdomainname

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Fork

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Filesystem bundle config.jsonͱrootfs https://github.com/opencontainers/runtime-spec/blob/master/bundle.md

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ࢠϓϩηεͷϧʔτ༻ʹ

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ࢠϓϩηεͷϧʔτ༻ʹ mount͍ͯ͘͠

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ࢠϓϩηεͷϧʔτ༻ʹ mount͍͖ͯ͠ ͦͯ͠pivot_root͢Δ

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ࢠϓϩηεʹ͸ / ʹݟ͑Δ

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cgroup ϓϩηεʹରͯ͠ ڞ௨ͷϦιʔε؅ཧΛ͢Δ https://gihyo.jp/admin/serial/01/linux_containers/0003

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Write Container Runtime in Go

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͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ

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https://github.com/opencontainers/runtime-spec/blob/master/runtime.md https://github.com/opencontainers/runtime-spec/blob/master/bundle.md https://github.com/golang-standards/project-layout#cmd https://github.com/golang/go/wiki/CodeReviewComments#interfaces https://employment.en-japan.com/engineerhub/entry/2019/02/05/103000#ίϯςφͱ͸ https://golang.org/pkg/go/build/#hdr-Build_Constraints https://github.com/rrreeeyyy/container-internship/tree/master/02#linux-namespaces https://employment.en-japan.com/engineerhub/entry/2019/02/05/103000 https://github.com/tomocy/gocon ࢀߟจݙ https://speakerdeck.com/kyohmizu/windowskontenaru-men?slide=26 https://speakerdeck.com/tenforward/cndt2019 https://sil.hatenablog.com/entry/why-container-is-secure