chroot-network-uts-container

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chrootͱnetwork namespace Ͱͭ͘Δ؆қίϯςφ ୈճίϯςφܕԾ૝Խͷ৘ใަ׵ձˏେࡕ

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ࣗݾ঺հ • id:masayoshi • ͸ͯͳˏژ౎ • WebΦϖϨʔγϣϯΤϯδχΞ • େֶ࣌୅͸SDNؔ࿈ͷݚڀ

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ࠓ೔࿩͢͜ͱ • ࣗ࡞ίϯςφͷϞνϕʔγϣϯ • chroot ✕ network namespace ✕ UTS namespace

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ࠓ೔࿩͢͜ͱ • TenForwardࢯͷৄࡉͳղઆͰجૅٕज़Λཧղ͠ɺ • ࢲͷࡶͳൃදͰίϯςφࣗ࡞ʹڵຯΛ࣋ͬͯ΋Β͍ɺ • udzuraࢯͷhaconiwaͰͥͻνϟϨϯδͯ͠ཉ͍͠

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ίϯςφࣗ࡞ͷϞνϕʔγϣϯ • Linuxίϯςφͷษڧ • جૅ෦෼ɺ࣮૷ʹΑΒͳ͍ڞ௨ٕज़ͷษڧ • طଘίϯςφٕज़ͷ࠶֬ೝ • ࡞ͬͯ࢖ͬͯΈΔͱҧ͍ͳͲ͕Α͘෼͔Δ • खݩͰͷωοτϫʔΫςετ؀ڥ • ࡉ͔͘มߋ͢ΔͷͰࣗ෼Ͱ৮Γ΍͍͢ํ͕ྑ͍

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chroot network namespace UTS namespace

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ͳΜͰ͜ͷ3ͭ? • ߹Θͤͯ࢖͏ͱγϯϓϧ͕ͩҙ֎ͱ͓΋͠Ζ͍෺͕ಈ͔ͤΔ • ֶੜͷͱ͖ݚڀͰnetwork nsΛΑ͘࢖͍ͬͯͨ • ωοτϫʔΫͰ༡Ϳͱ͖͸͜ͷߏ੒Λ࢖͍ͬͯΔ • chroot namespaceͷҰ෦ͷΈͷ૊Έ߹Θͤ͸ଟ͘ͳͦ͞͏ • 1ͭ1ͭ΍શͯΛ૊Έ߹Θ࣮ͤͨ૷ྫ͸৭ʑ͋Δ

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͜ͷ3ͭͰ΋໘ന͍͜ͱ͕ग़དྷΔ • chroot • docker exportͳͲͷల։͞ΕͨΠϝʔδͷ࣮ߦ • network namespace • ಛఆͷIPΞυϨε + ϙʔτͰͷLISTEN • UTS namespace • ؅ཧ্ͷརศੑ

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ྫ͑͹ • apache + mackerel-agent + ssh ͳίϯςφ • Webαʔό • ؂ࢹ༻ΤʔδΣϯτͱssh͕ಈ࡞ • ΞϓϦέʔγϣϯ + ؂ࢹ + ؅ཧ • ಉҰͷ෺ཧαʔόͰ্هͷίϯςφΛෳ਺ىಈՄೳ • network͸Linux BridgeͰϒϦοδ઀ଓ

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#SJEHF ϗετ໊UFTU ϗετ໊UFTU FUI IUUQE TTI IUUQE TTI WBSDPOUBJOFSUFTU WBSDPOUBJOFSUFTU NBDLFSFMBHFOU NBDLFSFMBHFOU

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UPVDIWBSSVOVUTOTUFTU VOTIBSFVUTSVOVUTOTUFTUIPTUOBNFUFTU JQOFUOTBEEUFTU JQMJOLBEEOBNFUFTUCSUZQFWFUIQFFSOBNFUFTUDU CSDUMBEEJGCSUFTUCS JQMJOLTFUUFTUDUOFUOTUFTU JQOFUOTFYFDUFTUJQBEESBEEEFWUFTUDU JQOFUOTFYFDUFTUJQMJOLTFUMPVQ JQOFUOTFYFDUFTUJQMJOLTFUUFTUDUVQ JQMJOLTFUUFTUCSVQ JQOFUOTFYFDUFTUJQSPVUFBEEEFGBVMUWJB NPVOUUQSPDQSPDNOUUFTUQSPD NPVOUSCJOETZTNOUUFTUTZT NPVOUNBLFSTMBWFNOUUFTUTZT NPVOUSCJOEEFWNOUUFTUEFW NPVOUNBLFSTMBWFNOUUFTUEFW

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UPVDIWBSSVOVUTOTUFTU VOTIBSFVUTSVOVUTOTUFTUIPTUOBNFUFTU JQOFUOTBEEUFTU JQMJOLBEEOBNFUFTUCSUZQFWFUIQFFSOBNFUFTUDU CSDUMBEEJGCSUFTUCS JQMJOLTFUUFTUDUOFUOTUFTU JQOFUOTFYFDUFTUJQBEESBEEEFWUFTUDU JQOFUOTFYFDUFTUJQMJOLTFUMPVQ JQOFUOTFYFDUFTUJQMJOLTFUUFTUDUVQ JQMJOLTFUUFTUCSVQ JQOFUOTFYFDUFTUJQSPVUFEEEFGBVMUWJB NPVOUUQSPDQSPDNOUUFTUQSPD NPVOUSCJOETZTNOUUFTUTZT NPVOUNBLFSTMBWFNOUUFTUTZT NPVOUSCJOEEFWNOUUFTUEFW NPVOUNBLFSTMBWFNOUUFTUEFW ίϯςφ࡞੒ʹίϚϯυ JNBHFͷ࡞੒͸আ͘

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σϞ͠ͳ͕Βݟ͍ͯ͘

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imageͷ࡞੒ • dockerͳΒdocker export Ͱ • build, ship͸dockerͰ΍Δͱָͦ͏ • ࠓճ͸run෦෼Ͱ༡Ϳ • dockerͳ͠ͳΒdebootstrapͳͲ • ࠓճ͸debootstrapͰ࡞੒ͨ͠΍ͭΛར༻

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namespaceͷӬଓԽ MSXYSXYSXYSPPUSPPU݄JQDJQD<> MSXYSXYSXYSPPUSPPU݄NOUNOU<> MSXYSXYSXYSPPUSPPU݄OFUOFU<> MSXYSXYSXYSPPUSPPU݄QJEQJE<> MSXYSXYSXYSPPUSPPU݄VUTVUT<> • /proc/[PID]/ns ഑Լʹ͋ΔಛघϑΝΠϧ QSPD<1*%>͸ϓϩηε͕ফ͑Δͱͳ͘ͳΔͷͰӬଓԽ͕ඞཁ

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namespaceͷӬଓԽ • bindϚ΢ϯτΛ͔ͭͬͯӬଓԽ͢Δ NPVOUCJOESVOVUTOTSVOVUTOT NPVOUNBLFTIBSFESVOVUTOT VOTIBSFVNPVOUCJOEQSPDTFMGOTVUTSVOVUTOT UFTU VOTIBSFVUTSVOVUTOTUFTU • ࠷ۙͷunshareίϚϯυ͸ӬଓԽָ͕

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UTS namespace • ओʹ؅ཧͷͨΊ • ίϯςφʹೖͬͨͱ͖ͱ͔ • γϯϓϧʹ࢖͑ΔͷͰ͓ؾܰ UPVDIWBSSVOVUTOTUFTU VOTIBSFVUTSVOVUTOTUFTUIPTUOBNFUFTU

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Networkͷ࡞੒ • veth࡞ͬͯbridgeʹ઀ଓ • TenForwardࢯʹΑΔσϞ͕͋Γͦ͏ͳͷͰলུ • (ࢲ͸)৭ʑมߋ͢Δ͜ͱ͕ଟ͍ • Linux BridgeΛOpen vSwitchʹͨ͠Γ • ࣗ࡞ͷιϑτ΢ΣΞϧʔλʹ઀ଓͨ͠Γ • KVMͷVMͱ઀ଓͨ͠Γ • ෳ਺NIC + mptcp؀ڥ

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Networkͷ࡞੒ • Network͸ϙʔλϏϦςΟʹӨڹ͕ग़΍͍͢ • Ұ࣌ظdocker͕ؤுͬͯͨ • VXLANʹΑΔoverlay NetworkͳͲ • վળ͢΂͖Օॴ͕ͨ͘͞Μ͋Δ໘ന͍෼໺ • ΦϑϩʔσΟϯά, SR-IOVͳͲߴ଎Խ • VXLANͳͲͷϓϩτίϧٕज़

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chroot؀ڥͷ࡞੒ • proc, sys, devͳͲΛmount͢Δ NPVOUUQSPDQSPDNOUUFTUQSPD NPVOUSCJOETZTNOUUFTUTZT NPVOUNBLFSTMBWFNOUUFTUTZT NPVOUSCJOEEFWNOUUFTUEFW NPVOUNBLFSTMBWFNOUUFTUEFW TZTUFNE؀ڥͰ͸CJOEϚ΢ϯτ͕4)"3&%ʹͳͬͨͷͰ STMBWF͓͔ͯ͠ͳ͍ͱVNPVOU3ͨ࣌͠ʹ͓͔͘͠ͳΔ

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ίϯςφ಺Ͱͷϓϩηεͷ࣮ߦ OTFOUFSOFUSVOOFUOTUFTUa VUTSVOVUTOTUFTUa DISPPUNOUUFTUa FUDJOJUEOHJOYTUBSU • nsenterΛ͔ͭͬͯnamespaceΛattach • ͦͷ্Ͱchroot͢Δ ಉ༷ʹTTIͳͲ΋ىಈ͢Δ

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ίϯςφ಺Ͱͷϓϩηεͷ࣮ߦ • chroot഑ԼͰ͸systemd͸ಈ࡞͠ͳ͍ͷͰ஫ҙ͕ඞཁ • chrootͷ୅ΘΓʹsystemd-nspawnΛ࢖ͬͯಈ͔͢ํ ๏΋͋Δ • ͦͷ৔߹ޙड़ͷPID namespaceΛ࢖͏͜ͱʹͳΔ

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PID namespace • PID෼཭͢Δͱੜ੒͞Εͨࢠϓϩηε͸ͦͷۭؒͰ͸init(PID=1) ͱͳΔ • init͕ࢮ͵ͱ൵͍͜͠ͱʹͳΔͷͰҡ࣋͢Δඞཁ͕͋Δ • ΑΓྑ͍initΛٻΊΔཱྀ͕࢝·Δ • docker 1.13Ͱ runʹ initΦϓγϣϯ͕෇͍ͯͦ͏ • ·ͨ/sbin/init Λ࣮ߦ͢Δɺ͠ͳ͍ͱ͍ͬͨબ୒ࢶ΋૿͑Δ • ࠓճͷ༻్Ͱ͸͍Βͳ͍ͷͰল͍ͨ • ࣮ࡍʹ͸ඞཁͱͳΔ͜ͱ͕ଟ͍ • ্هཧ༝Ͱؾܰʹ΍ΔͳΒল͘ͱָ

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PID namespaceΛར༻͠ͳ͍ͱ… • ps ݁Ռ͕෼཭͞Εͳ͍ • ίϯςφ಺ɺίϯςφ֎͔Βݟ์୊ • initʹͿΒԼ͕Δdaemon • UST, networkͷnamespace͸෼཭͞Ε͍ͯΔ • ϓϩηεੜ੒࣌ʹ෼཭͠ͳ͚Ε͹ܧঝ͞ΕΔ • ϓϩηεͷऴྃΛͲ͏͢Δ͔ • ss -N test01 -tlpͳͲͰLISTENΛ֬ೝ͢Δͱ෼཭͞Ε͍ͯ Δ͜ͱ͕Θ͔Δ

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ps ݁Ռ SPPUOHJOYNBTUFSQSPDFTTVTSTCJOOHJOY IUUQa@OHJOYXPSLFSQSPDFTT IUUQa@OHJOYXPSLFSQSPDFTT IUUQa@OHJOYXPSLFSQSPDFTT IUUQa@OHJOYXPSLFSQSPDFTT SPPUOHJOYNBTUFSQSPDFTTVTSTCJOOHJOY IUUQa@OHJOYXPSLFSQSPDFTT IUUQa@OHJOYXPSLFSQSPDFTT IUUQa@OHJOYXPSLFSQSPDFTT IUUQa@OHJOYXPSLFSQSPDFTT

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ss݁Ռ TVEPTT/UFTUMUQ 4UBUF3FDW24FOE2ɹ-PDBM"EESFTT1PSUɹ1FFS"EESFTT1PSU -*45&/ɹIUUQɹɹVTFST OHJOY QJE GE -*45&/ɹIUUQɹɹVTFST OHJOY QJE GE TVEPTT/UFTUMUQ 4UBUF3FDW24FOE2ɹ-PDBM"EESFTT1PSUɹ1FFS"EESFTT1PSU -*45&/ɹIUUQɹɹVTFST OHJOY QJE GE -*45&/ɹIUUQɹɹVTFST OHJOY QJE GE

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curl DVSM UFTUDPOUBJOFSOHJOY DVSM UFTUDPOUBJOFSOHJOY

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SSH TTI DBUFUDEFCJBO@WFSTJPO TTI DBUFUDEFCJBO@WFSTJPO TUSFUDITJE

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·ͱΊΔͱ… • image಺ͷϥΠϒϥϦόʔδϣϯͰಈ࡞ • ίϯςφ಺Ͱෳ਺ͷΞϓϦέʔγϣϯΛىಈ • ҟͳΔIPΞυϨεͰ௨৴ • ؆୯ͳΞϓϦέʔγϣϯΛ࣮ߦ͢Δ͙Β͍͸Ͱ͖ͦ͏ • ൺֱతރΕ͍ͯΔ΋ͷ͔͠࢖͍ͬͯͳ͍ + γϯϓϧͳ ͷͰ҆ఆ͸͍ͯͦ͠͏

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͍͚ͯͳ͍Օॴ • ͍͚ͯͳ͍Օॴͷطଘίϯςφٕज़Ͱͷղܾ๏ͱ  ࣗ෼Ͱ࣮૷͢ΔࡍͷղܾํΛൺֱ͢Δͱָ͍͠ • image؅ཧ • Netoworkߏ੒ • PIDͷ؅ཧ, ϓϩηεͷॲཧํ๏ • Ϧιʔε੍ݶ • ηΩϡϦςΟ

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• imageͷ؅ཧػೳ • snapshot΍ɺόʔδϣχϯά͸? • imageͷҠಈ͸Ͳ͏͢Δ? • Networkߏ੒ • αϒωοτ΋ݻఆͰIP΋खಈͳͷͰҠಈ͸Ͳ͏͢Δʁɹ • ҟͳΔαϒωοτͱͷ௨৴͸? • PID෼཭ɺϓϩηεॲཧ • PID͸෼཭͢Δ or ͠ͳ͍? • ίϯςφ಺ͷinitͷॲཧ • γεςϜίϯςφ? ΞϓϦέʔγϣϯίϯςφ?

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·ͱΊ • ίϯςφࣗ࡞͸ؾܰʹͰ͖Δ • Կ͕ίϯςφ͔ͱ͍͏࿩͸͋Δ͕ namespace͸ؾܰʹ࢖͑Δ • طଘίϯςφٕज़΁ͷཧղ͕ਂ·Δ • ͨΓͳ͍ͱ͜Ζ΋ݟ͑ͯ͘Δ • Ұճ͸৮͓ͬͯ͘ͱྑͦ͞͏