Rapid Container Scheduling for Reactive Relocation of Individual HTTP Requests

Rapid Container Scheduling for Reactive Relocation of Individual HTTP Requests
FIT2020 トップカンファレンスセッション

2020/09/03
さくらインターネット株式会社
さくらインターネット研究所
上級研究員
松本亮介 / @matsumotory / Ryosuke Matsumoto

Transcript

1. ͘͞ΒΠϯλʔωοτגࣜձࣾ
   (C) Copyright 1996-2020 SAKURA Internet Inc
   ͘͞ΒΠϯλʔωοτݚڀॴ
   Rapid Container Scheduling
   for Reactive Relocation of Individual HTTP Requests
   2020/09/03 ্ڃݚڀһ দຊ ྄հ
   FIT2020 τοϓΧϯϑΝϨϯεηογϣϯ
   

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2. • COMPSAC: IEEE Computer Society Flagship International Conference
   • COMPSAC 2020 Message from the 2020 Program Chairs-in-Chief ※1
   • over 450 submissions this year, to both our conference tracks and associated workshops
   • accepted 69 regular papers and 69 short papers
   • 76 papers that were not accepted for the main conference were referred to COMPSAC
   workshops
   • An additional 146 papers were submitted directly to our associated workshops
   • ͜ΕΒΛಡΉݶΓRegular Paperͷ࠾୒཰͸ 69 / (450 - 146) ͷ23%ҎԼ
   2
   COMPSAC 2020 Regular Paper
   ˞.FTTBHFGSPNUIF1SPHSBN$IBJSTJO$IJFG IUUQTJFFFDPNQTBDDPNQVUFSPSH
   

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3. 1. എܠͱ໨త
   2. ؔ࿈ݚڀͷ՝୊
   3. ఏҊख๏
   4. ࣮ݧͱߟ࡯
   5. ·ͱΊͱaccept·Ͱͷաఔ
   3
   ໨࣍
   

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4. 1.
   എܠͱ໨త
   

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5. • ݸਓ͕౰ͨΓલʹଟछଟ༷ͳWebαΠτΛ࣋ͭ࣌୅
   • Ϋϥ΢υɾVPSͷΑ͏ͳࣗ༝౓ͱִ཭؀ڥʢΠϯελϯεʣʹର͢Δཁٻ
   • SNSΛհͯ͠ݸਓͷίϯςϯπΛ֦ࢄ͠΍͍࣌͢୅
   • ݸਓͷWebαΠτ΁ͷΞΫηεूத͢Δػձͷ૿େ
   • ݸਓαΠτͰ΋ΞΫηεूத΍ো֐ͱ͍ͬͨมԽʹڧ͍ج൫͕ඞཁ
   • ༧ଌͰ͖ͳ͍ΞΫηε܏޲ͱϦιʔεׂ౰ΛϦΞΫςΟϒʹߦ͍͍ͨ
   • ଟछଟ༷ͳWebΞϓϦʹͰ͖Δ͚ͩରԠͯ͠બ୒ࢶΛఏڙ͍ͨ͠
   5
   ݸਓͷWebαΠτ΁ͷΞΫηεूத΍৴པੑ
   

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6. 1. Πϯελϯε্ͰWordPressͷΑ͏ͳҰൠత͔ͭଟ༷ͳWebΞϓϦ͕ಈ࡞Մೳ
   • ઐ໳తͳ஌͕ࣝͳͯ͘΋ར༻Ͱ͖Δ҆ՁͳαʔϏεΛ࣮ݱ͍ͨ͠
   2. Πϯελϯεͷঢ়ଶมߋॲཧ͕ߴ଎
   • Πϯελϯε(ίϯςφ)ͷঢ়ଶͷఀࢭɾىಈɾεέʔϦϯάΛߴ଎ʹ॥؀
   • ϦΫΤετ୯ҐͰϦΞΫςΟϒʹঢ়ଶΛܾఆ → มԽʹڧ͍ج൫΁
   3. ϋʔυ΢ΣΞϦιʔεͷར༻ޮ཰Λ޲্
   • ϦΫΤετ͕ແ͍Πϯελϯε͸Ұఆظؒىಈޙʹఀࢭ
   ΠϯελϯεΛߴूੵʹऩ༰ՄೳͰมԽʹڧ͍Ծ૝Խج൫FastContainer
   6
   ߃ৗੑͷ͋ΔมԽʹڧ͍ج൫ͷؔ࿈ݚڀ※1
   ˞3ZPTVLF.BUTVNPUP 6DIJP,POEP ,FOUBSP,VSJCBZBTIJ 'BTU$POUBJOFS")PNFPTUBUJD4ZTUFN"SDIJUFDUVSF)JHITQFFE"EBQUJOH&YFDVUJPO
   &OWJSPONFOU$IBOHFT 5IFSE"OOVBM*&&&*OUFSOBUJPOBM$PNQVUFST 4PGUXBSF BOE"QQMJDBUJPOT$POGFSFODF $0.14"$
   +VMZ
   

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7. • Մ༻ੑ୲อͷͨΊʹෳ਺ΠϯελϯεՔಇͤ͞Δ͜ͱʹΑΔίετͷ૿େ
   • ෳ਺ͷऩ༰αʔόʹΠϯελϯεΛͦΕͧΕՔಇͤ͞Δ͜ͱͰՄ༻ੑΛ୲อ
   • ߴूੵʹΠϯελϯεऩ༰͢Δ؍఺͔ΒͰ͖Δ͚ͩϦιʔεΛઅ໿͍ͨ͠
   • ར༻ऀ໨ઢͰ΋Մ༻ੑΛ୲อͭͭ͠අ༻Λ࡟ݮ͍ͨ͠
   • ґવͱͯ͠ɺHTTPͷϨεϙϯελΠϜͷ؍఺͔ΒɺFastContainerͷHTTPϦ
   ΫΤετܖػͰঢ়ଶΛมߋ͢Δ࣌ؒͷ୹ॖ΋՝୊
   • ίϯςφࣗମ͸଎͘ىಈͯ͠΋தͰಈ͘αʔόϓϩηεͷىಈ͕஗͍
   7
   FastContainer͓Αͼؔ࿈ݚڀͷՄ༻ੑͷ՝୊
   

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8. 1. Πϯελϯε্ͰWordPressͷΑ͏ͳҰൠతͳWebΞϓϦ͕ಈ࡞Մೳ
   2. ୯ҰΠϯελϯεͰ΋ऩ༰αʔόো֐࣌ʹ͸ผαʔό΁ࣗಈతʹ࠶഑ஔՄೳ
   3. Πϯελϯεͷ࠶഑ஔͷ࣮ߦ࣌Ͱ͋ͬͯ΋਺ඵͷ஗ԆͰHTTPλΠϜΞ΢τ͢
   Δ͜ͱͳ͘ΦϯϥΠϯͰϨεϙϯεΛૹ৴Մೳ
   • iPhoneͰ4GճઢΛܦ༝͢Δͱਓ͕ؒؾ͔ͮͳ͍Α͏ͳ஗Ԇ
   ΠϯελϯεΛߴ଎ʹ࠶഑ஔՄೳʹ͢Δ͜ͱͰूੵ཰Λ޲্ͤ͞
   ௿ίετͳج൫Λ࣮ݱ͢ΔεέδϡʔϦϯάख๏ͷఏҊ
   8
   ݚڀͷ໨త: ϦΫΤετ୯Ґ ͰͷΠϯελϯε࠶഑ஔ
   

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9. 2.
   ؔ࿈ݚڀͷ՝୊
   

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10. • FastContainer ※1͸HTTPϦΫΤετʹԠͯ͡൓Ԡత͔ͭߴ଎ʹΠϯελϯε
    ͷঢ়ଶʢىಈɺఀࢭɺҠಈɺෳ੡ɺϦιʔε૿ݮ౳ʣΛܾఆ
    • αʔϏεར༻ऀ͸Wordpressͱ͔WebΞϓϦΛී௨ʹ࢖͏Α͏ͳ࢖͍ํ
    • ΞΫηε਺ʹԠͨ͡ϦΞΫςΟϒͳεέʔϦϯάॲཧ͕Մೳ
    • Ϋϥ΢υαʔϏεج൫͸༧ΊΠϯελϯεΛىಈͤͯ͞ϦΫΤετΛॲཧ
    • ΞΫηεूத࣌͸༧ଌత͔ͭϓϩΞΫςΟϒͳεέʔϦϯάॲཧ͕ඞཁ
    10
    FastContainerͱΫϥ΢υαʔϏεج൫ͷಛ௃
    ˞3ZPTVLF.BUTVNPUP 6DIJP,POEP ,FOUBSP,VSJCBZBTIJ 'BTU$POUBJOFS")PNFPTUBUJD4ZTUFN"SDIJUFDUVSF)JHITQFFE"EBQUJOH&YFDVUJPO
    &OWJSPONFOU$IBOHFT 5IFSE"OOVBM*&&&*OUFSOBUJPOBM$PNQVUFST 4PGUXBSF BOE"QQMJDBUJPOT$POGFSFODF $0.14"$
    +VMZ
    

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11. 1. WordPressͷΑ͏ͳҰൠతͳWebΞϓϦέʔγϣϯΛར༻Մೳ
    2. Πϯελϯε΍ίϯςφͷऩ༰αʔόͷো֐࣌ʹHTTPλΠϜΞ΢τ͕ੜ͡ͳ
    ͍ϨϕϧͰαʔϏεΛܧଓͰ͖Δఔ౓ͷՄ༻ੑΛ૝ఆ
    11
    ຊݚڀʹ͓͚ΔԾ૝Խج൫ͱՄ༻ੑͷલఏ
    

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12. • ༷ʑͳWebΞϓϦέʔγϣϯ͕ར༻Մೳ
    • IaaS΍PaaSΛར༻ͨ͠Πϯελϯε୯ҐͰͷߏங͓ΑͼՄ༻ੑ୲อ͕Ұൠత
    • ຊݚڀͷՄ༻ੑ͕લఏͷ৔߹ɺෳ਺ऩ༰αʔόʹͦΕͧΕΠϯελϯεΛϗο
    τελϯόΠํࣜʢىಈࡁΈͷ଴ػΠϯελϯεʣͰ଴ػ͢Δ͜ͱͰ࣮ݱ
    • ऩ༰αʔόఀࢭ࣌ʹ΋ଈ࣌αʔϏεΛܧଓ͢ΔͨΊ
    • ෳ਺Πϯελϯεͷىಈ͕લఏͱͳΓϦιʔε઎༗ͷίετ͕૿େ
    • ϦΞΫςΟϒʹՄ༻ੑΛ୲อ͢Δʹ͸ϨεϙϯελΠϜ΁ͷӨڹ͕େ͖͍
    12
    FastContainer΍Ϋϥ΢υج൫ͷՄ༻ੑ
    

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13. 4UPSBHF
    $MJFOU
    4FSWFS
    JOTUBODF"
    JOTUBODF#
    JOTUBODF$
    4FSWFS
    JOTUBODF"
    'BTU$POUBJOFS΍Ϋϥ΢υج൫ͷՄ༻ੑ
    )551ϦΫΤετ
    4UPSBHF
    $MJFOU
    4FSWFS
    JOTUBODF"
    JOTUBODF#
    JOTUBODF$
    4FSWFS
    JOTUBODF"
    )551ϦΫΤετ
    ✗
    13
    αʔόো֐
    

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14. 3.
    ఏҊख๏
    

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15. 1. Πϯελϯε্ͰWordPressͷΑ͏ͳҰൠతͳWebΞϓϦ͕ಈ࡞Մೳ
    2. ୯ҰΠϯελϯεͰ΋ऩ༰αʔόো֐࣌ʹ͸ผαʔό΁ࣗಈతʹ࠶഑ஔՄೳ
    3. Πϯελϯεͷ࠶഑ஔͷ࣮ߦ࣌Ͱ͋ͬͯ΋਺ඵͷ஗ԆͰHTTPλΠϜΞ΢τ͢
    Δ͜ͱͳ͘ΦϯϥΠϯͰϨεϙϯεΛૹ৴Մೳ
    15
    ఏҊख๏: ϦΫΤετ୯Ґ ͰͷΠϯελϯε࠶഑ஔ
    

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16. 16
    4UPSBHF
    $MJFOU
    4FSWFS
    JOTUBODF"
    JOTUBODF#
    JOTUBODF$
    4FSWFS
    ఏҊख๏ʴ'BTU$POUBJOFSͷՄ༻ੑ
    )551ϦΫΤετ
    4UPSBHF
    $MJFOU
    4FSWFS
    JOTUBODF"
    JOTUBODF#
    JOTUBODF$
    4FSWFS
    )551ϦΫΤετ
    JOTUBODF"
    ✗൓Ԡతʹ
    ࠶഑ஔ
    αʔόো֐
    

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17. HTTP FastContainerͷجຊϑϩʔ
    17
    8FC1SPYZ
    ʢOHY@NSVCZ
    
    $.%#
    ʴ
    "1*
    8FC%JTQBUDIFS
    OHY@NSVCZ
    
    $MJFOU ίϯςφ
    ίϯςφ
    ίϯςφ
    w )551ϦΫΤετͷ)PTUOBNF
    ΛΩʔʹɺ$.%# ߏ੒؅ཧ%#
    
    ͔Βίϯςφͷ৘ใΛऔಘ
    )551 4
    
    ϦΫΤετ
    w ίϯςφͷ*1ͱϙʔτʹج͍
    ͯίϯςφʹϓϩΩγ
    w ίϯςφ͕-JTUFO͍ͯ͠ͳ͍
    ৔߹͸$.%#͔Βίϯςφ
    ৘ใΛಘͯىಈ
    $POUBJOFS&OHJOF
    IBDPOJXB
    
    ऩ༰ϗετ"
    

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18. 1. Proxy͔Βऩ༰αʔόʹICMP/TCPͰ࠷௿ݶͷύέοτͰԠ౴଎౓Λଌఆ
    2. Ԡ౴଎౓͕ᮢ஋Λ௒͍͑ͯͨΒผͷऩ༰αʔό΁࠶഑ஔ
    3. ίϯςφىಈ࣌͸ɺىಈ׬ྃ௚લͷঢ়ଶͷϓϩηεΠϝʔδ͔Β෮ݩ
    → ඇৗʹγϯϓϧͳํࣜͰߴ଎ͳ࠶഑ஔΛ࣮ݱՄೳ
    → ୯ҰͷίϯςφͰ࣮༻తͳՄ༻ੑΛ୲อՄೳʢϦιʔείετͷ࡟ݮʣ
    18
    ߴ଎ͳऩ༰ϗετͷࢮ׆؂ࢹͱ࠶഑ஔ
    

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19. )PTU04
    8FC1SPYZ
    $.%#"1*
    $POUBJOFS
    %JTQBUDIFS
    $POUBJOFS
    )PTU04
    $POUBJOFS
    %JTQBUDIFS
    $POUBJOFS
    $MJFOU
    )551
    *$.1
    )551
    )551
    )551
    *$.1PS5$1
    

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20. )PTU04
    8FC1SPYZ
    $.%#"1*
    $POUBJOFS
    %JTQBUDIFS
    $POUBJOFS
    )PTU04
    $POUBJOFS
    %JTQBUDIFS
    $POUBJOFS
    $MJFOU
    )551 *$.1PS5$1
    *$.1PS5$1
    )551
    )551
    )551
    ✗
    ࠷ॳͷ࠶഑ஔ࣌͸ίϯςφͷىಈ͕ඞཁͰ͋Δ͕ɺ
    ىಈޙ͸Ұఆظؒىಈ͠ଓ͚Δɻ
    

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21. • ICMP/TCPͰᮢ஋νΣοΫ͕Ұ࣌తʹޡݕ஌ͯ͠΋Өڹ͕গͳ͍
    • TCPͷ৔߹͸ࣗ࡞TCPελοΫͰԟ෮3ύέοτͰνΣοΫ[3][4]
    • FastContainerͳͷͰޡݕ஌ͷ࠶഑ஔ͕ੜͯ͡΋αʔϏε͕ܧଓ͞ΕΔ
    • ޡݕ஌Ͱଞαʔόʹىಈͯ͠͠·ͬͯ΋Ұఆ࣌ؒىಈͨ͠Βఀࢭ͢Δ
    • ݩαʔόʹ࠶഑ஔ͞ΕͯCMDB্͸ݩαʔόͷΈʹϦΫΤετ͕ྲྀΕΔ
    • Ԡ౴࣌ؒͷᮢ஋΍λΠϜΞ΢τΛΪϦΪϦ·ͰνϡʔχϯάՄೳ
    21
    ఏҊख๏ͷϙΠϯτʢICMP/TCP؂ࢹʣ
    <>NBUTVNPUPSZ NSVCZGBTUSFNPUFDIFDL IUUQTHJUIVCDPNNBUTVNPUPSZNSVCZGBTUSFNPUFDIFDL
    <>-JOVYΧʔωϧͷ5$1ελοΫͱγεςϜίʔϧͷ૊Έ߹ΘͤʹΑΔख๏ΑΓ΋ߴ଎ʹϙʔτͷ-JTUFOνΣοΫΛ
    ߦ͏ IUUQTICNBUTVNPUPSKQFOUSZ
    

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22. • ίϯςφ಺ͷWebαʔόϓϩηεΛىಈ׬ྃ௚લͰΠϝʔδԽ(Checkpoint)
    • ఆظతʹඇಉظͰϓϩηεͷىಈ׬ྃ௚લΠϝʔδΛ࡞੒͓ͯ͘͠
    • ϦΫΤετड৴࣌ʹΠϝʔδΛϓϩηεʹ෮ݩ(Restore)
    • αʔόϓϩηεͷॳظԽॲཧΛεΩοϓ
    • ىಈʹ࣌ؒͷ͔͔ΔΞϓϦέʔγϣϯαʔό౳ʹ༗ར
    • Ruby on RailsɼDjangoͳͲ
    22
    ఏҊख๏ͷϙΠϯτʢCheckpoint/Restoreʣ
    

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23. • αʔόϓϩηεͷىಈ௚ޙΛίϯςφϥϯλΠϜͰϑοΫͯ͠Checkpoint
    • ࢀߟ: seccompͰγεςϜίʔϧΛ؂ࢹ͠ptraceͰҰ࣌ఀࢭ͔ͯ͠ΒCRIUͰ
    CheckpointʹΑΔΠϝʔδԽͱ͍͏ํ๏΋͋Δ
    • CRIUͷதͰseccompΛ࢖͓ͬͯΓύον͕ඞཁͰ൚༻ੑʹ͔͚Δ
    • ϦΫΤετΛड͚ͯίϯςφΛىಈ͢Δ࣌͸Πϝʔδ͔ΒRestoreͯ͠ىಈ
    23
    Checkpoint/RestoreʹΑΔFastContainerͷىಈ
    

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24. αʔόϓϩηεͷCheckpoint/Restoreͷ࣮૷
    24
    SFGl04ϨΠϠͰ8FCαʔό͕ىಈ࣌ʹ࣮ߦ͢ΔγεςϜίʔϧΛ؂ࢹ͠ىಈ׬ྃ௚લͷϓϩηεΛΠϝʔδԽ͢ΔlIUUQ
    ICNBUTVNPUPSKQFOUSZ
    

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25. 4.
    ࣮ݧͱߟ࡯
    

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26. FastContainerͷγεςϜߏ੒
    26
    

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28. • ༧උ࣮ݧ: CRIUͱCheckpoint/Restore͢ΔϓϩηεͷϝϞϦαΠζͱͷؔ܎
    • ୅දతͳΞϓϦέʔγϣϯΛ࢖ͬͨίϯςφ࠶഑ஔ࣌ͷϨεϙϯελΠϜ
    • Apache 2.4.18ɼPHP 7.3.0ɼWordpress 5.0.3ʢσϑΥϧτϖʔδʣ
    • Python 3.7.1ɼDjango 2.1.4ɼgunicorn 19.9.0※1
    • Ruby 2.5.1ɼRails 5.2.1ɼPuma 3.12.0※2
    28
    ࣮ݧ಺༰
    ˞IUUQTNDMPMJQPQ[FOEFTLDPNIDKBBSUJDMFT
    ˞IUUQTHJUIVCDPNFWFSZMFBGFMUSBJOJO
    ݱ࣮తͳن໛ʢݸਓάϧʔϓ಺Ͱͷར༻ͷΞϓϦέʔγϣϯఔ౓ʣͰ%#Λར༻ͨ͠΋ͷΛ࠾
    

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29. • ComputeͰWebαʔόͷCheckpoint/Restoreͷ଎౓Λܭଌ
    • mruby-simplehttpserver※1ͰWebαʔόΛىಈͤ͞setsockopt()Λ؂ࢹ
    • setsockopt()࣮ߦલʹCheckpoint
    • setsockopt()࣮ߦલʹϝϞϦΛ֬อͯ͠ɺϝϞϦαΠζʹԠͯ͡
    Checkpoint/Restoreͷ଎౓ͷมԽΛܭଌ
    29
    ༧උ࣮ݧɿϓϩηεͷΠϝʔδԽͷ࣮ݧ
    ˞NBUTVNPUPSZNSVCZTJNQMFIUUQTFSWFS IUUQTHJUIVCDPNNBUTVNPUPSZNSVCZTJNQMFIUUQTFSWFS
    

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30. αʔόϓϩηεͷΠϝʔδԽ(Checkpoint/Restore)
    30
    $IFDLQPJOU3FTUPSF1SPDFTTJOH5JNFEVFUP.FNPSZ6TBHF
    1SPDFTTJOHUJNF
    
    
    
    
    
    
    
    
    
    
    
    .FNPSZVTBHFQFSQSPDFTT<.#>
    
    $IFDLQPJOU 3FTUPSF
    ୯ҰͷαʔόϓϩηεͷϝϞϦ࢖༻ྔʹԠͨ͡$IFDLQPJOU3FTUPSFʹඞཁ
    

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31. • ComputeͰApache httpdͷϓϩηε਺ΛมԽ
    • HTTPϦΫΤετΛܖػʹApache httpdΛىಈͤͯ͞ϨεϙϯεΛฦ͢
    • ਺ेόΠτͷ੩తͳindex.htmlʹର͢ΔϦΫΤετ
    • CRIUΛ࢖͏৔߹
    • CRIUΛ࢖Θͳ͍৔߹
    31
    ༧උ࣮ݧ2ɿϓϩηε਺ͱCRIUͷؔ܎
    

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32. Apacheͷworker਺ͱCRIUͷؔ܎
    32
    )PUTUBSU͸શͯͷ8PSLFSϓϩηε
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    XPSLFSϓϩηε͕ىಈ͢Ε͹Ϩεϙ
    ϯεΛฦ͢͜ͱ͕Ͱ͖ΔͨΊҰఆɽ
    $3*6͔Βͷىಈ͸8PSLFSϓϩηε
    ΛશͯΠϝʔδ͔͢ΔͨΊɼશ͕ͯ
    3FTUPSF͞Ε͔ͯΒϨεϙϯεΛฦ͢
    ͨΊ୯ௐ૿Ճɽ
    

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33. • Apache 2.4.18ɼPHP 7.3.0ɼWordpress 5.0.3
    • ϓϩηε਺͸3ɼ୯ҰͷϓϩηεͷϝϞϦαΠζ(RSS)͸35MBytes
    • Python 3.7.1ɼDjango 2.1.4ɼgunicorn 19.9.0 ※1
    • ϓϩηε਺2ɼεϨου਺2ɼ୯ҰͷϓϩηεͷRSS͸33MBytes
    • Ruby 2.5.1ɼRails 5.2.1ɼPuma 3.12.0 ※2
    • ϓϩηε਺2ɼεϨου਺14ɼ୯ҰͷϓϩηεͷRSS͸89MBytes
    • gemΛࣄલίϯύΠϧ͓ͯ͘͠bootsnapͱ΋ൺֱ
    33
    ίϯςφ࠶഑ஔ࣌ͷϨεϙϯελΠϜ
    

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34. WordPress on Apache httpd
    34
    BCίϚϯυͰಉ࣌઀ଓ਺ͷϕϯνϚʔΫΛ͔͚ͳ͕Β
    ऩ༰ϗετΛJQBUBCMFTͰԾ૝తʹμ΢ϯͤͯ͞ɼผͷऩ༰αʔόʹ࠶഑ஔΛڧ੍తʹൃੜͤͨ͞
    

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35. Django
    35
    IUUQTNDMPMJQPQ[FOEFTLDPNIDKBBSUJDMFT
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36. Ruby on Rails
    36
    IUUQTHJUIVCDPNFWFSZMFBGFMUSBJOJO
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37. 5.
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38. • ୯ҰΠϯελϯεͰՄ༻ੑΛ୲อ͢Δߴ଎ͳεέδϡʔϦϯάख๏ΛఏҊ
    • ෳ਺ΠϯελϯεΛඞཁͱ͠ͳ͍ͨΊϦιʔείετ͕௿͍
    • ࣮ݧ͔Βݱ࣌఺Ͱ΋࣮༻ՄೳͳϨϕϧͷ࠶഑ஔͷੑೳ͕ಘΒΕͨ
    • ϓϩμΫγϣϯ؀ڥͰԠ༻
    • ϗετো֐࣌Ͱ͋ͬͯ΋Ϣʔβ͕ؾ͔ͮͳ͍ϨϕϧͰͷՄ༻ੑ
    • ΦʔτεέʔϦϯά࣌ʹ΋γʔϜϨεʹίϯςφΛ૿΍ͯ͠ෛՙରࡦՄೳʹ
    • ΞΫηε܏޲ͱϦιʔεׂΓ౰͕ͯਖ਼֬ʹ௥ਵՄೳʹ
    • εέʔϦϯά΍ϋʔυ΢ΣΞϓʔϧͷϦιʔεׂΓ౰ͯ΋࠷దԽ
    38
    ·ͱΊ
    

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39. • ࠷ॳͷWWW2020ʹఏग़ͯ͠Reject͞Εͨཧ༝
    • ݚڀͷཱͪҐஔ͕ෆ໌֬ɺ৽نੑ͕͍·͍ͪΑ͘Θ͔Βͳ͍
    • ຊݚڀͷཱͪҐஔ΍લఏͷ໌֬Խ
    • ൺֱ͢΂͖ؔ࿈ݚڀ͕ෆ໌ྎ
    • ຊݚڀͱൺֱ͢΂͖ؔ࿈ݚڀΛॆ࣮ͤͯࠩ͞෼Λ໌֬Խ
    ڭ܇: ΠϯλʔωοτɾWebٕज़෼໺Ͱ͸ൃද࿦จ΍OSSͷ਺΍ٕज़ͷมԽ଎౓
    ͕ඇৗʹ଎͍ͨΊɺݚڀͷείʔϓͱ࠷৽ͷ՝୊Λ໌֬ʹ্ͨ͠Ͱࠩ෼Λ͔ͬ͠
    Γͱࣔ͠ɺͦͷ՝୊͕ݱ࣮తʹͲΕ΄Ͳҙ͕ٛ͋Δ͜ͱͳͷ͔Λࣔ͢͜ͱ͕େࣄ
    39
    Accept·Ͱͷաఔ
    

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