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How We Foster Reliability in Diversity

How We Foster Reliability in Diversity

SRE NEXT 2022 の基調講演の資料です。
https://sre-next.dev/2022/schedule#kc01

Takamura Narimichi

May 14, 2022
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  2. 2

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  3. 3

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  4. 4

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  5. 5

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  6. 6

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  7. Motivation
    • اۀͷઓུ΍αʔϏεɺจԽͳͲͷݻ༗ͷίϯςΩετ͕͋Δ
    தͰɺͲͷΑ͏ʹ૊৫ʹ SRE Λ࣮ફ͢ΔͱΑ͍͔
    • αʔϏεΛऔΓר͘؀ڥͷมԽʹରͯ͠ SRE ͸ͳʹ͕Ͱ͖Δͷ
    ͔
    => ૊৫ʹదͨ͠ SRE Λఆٛ͠ɺҭ͍ͯͯͨ͘ΊͷऔΓ૊ΈΛ঺հ
    ͠ͳ͕Βɺଟ༷ੑͱͱ΋ʹ SRE ͕ͲͷΑ͏ʹาΜͰ͍͔͘ ʹ͍ͭ
    ͓ͯ࿩͠·͢ɻ
    7

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  8. 8

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  9. 9

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  10. ٻΊΒΕΔ SRE ͷଟ༷Խ
    10

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  11. SRE ͕ଟ༷Խ͢Δཧ༝
    • ૊৫͝ͱʹ৴པੑͷఆ͕ٛҟͳΔͨΊ
    • ৴པੑ͸ࣄۀઓུ΍γεςϜಛੑͳͲ༷ʑͳཁૉ͕Өڹ͢Δ
    • αʔϏεΛऔΓר͘͢΂ͯͷཁૉ͕ಉ͡ʹͳΔ͜ͱ͸ͳ͍
    • ৴པੑͷܭଌํ๏΍໨ඪ஋ɺͦͷୡ੒ํ๏ʹ͍ͨΔશ͕ͯಉ
    ͡ʹͳΔ͜ͱ͸ͳ͍
    • → SRE ΛҰ༷ʹ࣮ફ͢Δ͚ͩͰ͸͏·͍͔͘ͳ͍
    11

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  12. ྫ: ϓϩμΫτͷϑΣʔζʹΑΔ৴པੑͷҧ͍
    12

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  13. ྫ: γεςϜಛੑʹΑΔ৴པੑͷҧ͍
    13

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  14. it's a marathon, not a sprint1
    1 With SRE, failing to plan is planning to fail
    14

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  15. Why is SRE a marathon?
    • ٕज़తͳ໘ͱਓؒతͳ໘ʢจԽ΍ϓϩηεͳͲʣͷ՝୊͕͍͘
    ͭ΋ંΓॏͳ͍ͬͯΔ
    • νʔϜϦʔμʔ΍ܦӦ૚Λר͖ࠐΉඞཁ͕͋Δ
    • ex. Ϧιʔεʢਓ΍͓ۚʣΛ৴པੑ࣮ݱͷͨΊʹׂΓ౰ͯΔ
    • ex. ࣗ෦໳த৺తͳߟ͑ํΛ୤͠ɺSRE ͷจԽతݪଇΛҭΉ
    → SRE ͸૊৫ͷมֵ͸൐͏΋ͷͰ͋ΓɺҰேҰ༦Ͱ͸੒͠ಘͳ͍
    15

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  16. 16

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  17. ૊৫ʹదͨ͠ SRE ͷ࣮ફ͸
    ͲͷΑ͏ʹߦ͏ͱΑ͍͔
    17

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  18. SRE ͷ࣮ફʹ͓͚Δॏཁͳ5ͭͷεςοϓ23
    1. ࣮ફʹඞཁͳ৘ใΛूΊΔ
    2. খ࢝͘͞Ίͯɺ܁Γฦ͢
    3. νʔϜΛࢧԉ͢Δ
    4. ֶΜͩ͜ͱΛεέʔϧ͢Δ
    5. σʔλυϦϒϯܕͷϚΠϯυηοτΛ۩ମԽ͢Δ
    => ͍͖ͳΓϓϥΫςΟε࣮ફΛ͢ΔͷͰ͸ͳ͘ɺঢ়گ೺Ѳ͔Β͸͡ΊΔ
    => ࠷ऴతʹ͸ɺ૊৫͕ࣗ཯తʹ SRE Λ࣮ફͰ͖Δঢ়ଶΛ໨ࢦ͢
    3 Four steps to jumpstarting your SRE practice
    2 The Professional Scrum Product Owner Book
    18

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  19. SLI/SLO ʹ͓͚Δεςοϓͷ࣮ફྫ
    εςοϓ ۩ମྫ
    ࣮ફʹඞཁͳ৘ใΛूΊΔ ৴པੑʹؔ͢Δ՝୊Λ೺Ѳɺࣄۀ੹೚ऀ΍ΤϯδχΞ
    Ϧϯά૊৫ͷϦʔμʔΛಛఆ͢Δ
    খ࢝͘͞Ίͯɺ܁Γฦ͢ ݫີͳ SLI/SLO Λఆٛͤͣɺখ͞ͳαʔϏεɾνʔϜ
    Λର৅ʹ͸͡ΊͯΈΔ
    νʔϜΛࢧԉ͢Δ Embbedded SRE Λ༻͍֤ͯνʔϜͰ SLI/SLO Λ࣮ફ͢
    Δ
    ֶΜͩ͜ͱΛεέʔϧ͢Δ ษڧձͷ։࠵ɺSRE Ξϯόαμʔͷ೚໋ͳͲʹΑͬͯ
    ద༻ൣғΛ֦େ͢Δ
    σʔλυϦϒϯܕͷϚΠϯυηοτΛ۩ମԽ͢Δ SLI/SLO ͷվળΛ௨ͯ͠ଌఆͷΧϧνϟʔΛৢ੒͢Δ
    19

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  20. 5ͭͷεςοϓʹΑΔ૊৫ͷมԽ
    • ʮঢ়گ೺Ѳʯˠʮখ࣮͘͞ફʯˠʮࢧԉʯˠʮՁ஋ೝࣝΛΞο
    ϓσʔτʯˠʮ૊৫શମ͕ೳಈతʹ࣮ફʯͷྲྀΕ
    • → ૊৫શମͷߦಈ͚ͩͰͳ͘ɺՁ஋؍΋มԽ͍ͯ͠Δ
    • ࣮ફ͢ΔϓϥΫςΟεʹΑͬͯ͸ɺՁ஋ೝࣝͷΞοϓσʔτҎ
    ߱ͷ޻ఔ͕ԕ͘ײ͡Δ......
    • → ߦಈݪཧͷཧ࿦Λ౰ͯ͸ΊΔ͜ͱͰ൫໘੔ཧ͕Ͱ͖ͦ͏
    20

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  21. ૊৫ͷණࢁϞσϧ
    • ߦಈݪཧʹؔ͢ΔණࢁͷϝλϑΝʔ
    • ໨ʹݟ͍͑ͯΔණΑΓ΋Կഒ΋େ͖͍ණ
    ͕ਫ໘Լʹଘࡏ͢Δ
    • Լ૚͸্૚ͷཁҼʹͳ͍ͬͯΔ
    • ex. ߦಈΛܾΊΔͷ͸ϙϦγʔ
    • ex. ϙϦγʔΛܾΊΔͷ͸Ձ஋؍
    • ্૚͸ม͑΍͘͢ɺԼ૚͸ม͑ʹ͍͘
    • ૊৫มֵ͸ɺ্͔Β͸΋ͪΖΜɺԼ͔Βͷ
    Ξϓϩʔν΋ॏཁ
    21

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  22. SRE ͷϓϥΫςΟεͱණࢁϞσϧ
    22

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  23. SRE ࣮ફʹ͓͚Δ೰Έ
    • SLI/SLO ͳͲͷϓϥΫςΟεͷ࣮ફ͸ɺLevel 1,2 Λ܁Γฦ͠มߋ͠ͳ͕
    Βɺ࠷ऴతʹՁ஋؍ΛΞοϓσʔτ͍ͯ͘͠औΓ૊Έͱ͍͑Δ
    • Level 1,2 ͷࣄྫ͸૿͖͍࣮͑ͯͯͯફʹऔΓֻ͔Γ΍͍͢
    • ͔͠͠ɺ্هͷऔΓ૊Έ͚ͩͰ͸ Level 3 ͷมԽʹ౸ୡ͠ͳ͍͜ͱ͕͋Δ
    • ೔ৗͷۀ຿͸มΘΔ͕ɺࣗ཯తͳ SRE ࣮ફʹ͸ڑ཭͕͋Δ
    • => Level 3 ʹରͯ͠ͳʹ͔Ξϓϩʔν͕Ͱ͖ͳ͍͔
    23

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  24. Level 3 ΁ͷΞϓϩʔν
    => SRE ͷํ޲ੑɾՁ஋؍Λ໌֬ʹ͢Δ
    24

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  25. ͲͷΑ͏ʹํ޲ੑɾՁ஋؍Λ໌֬ʹ͢Δ͔
    • ϑϨʔϜϫʔΫ͸ϛογϣϯɾϏδϣϯɾόϦϡʔΛར༻
    • খ͘͞͸͡ΊΔͨΊʹ SREs ͷΈΛର৅
    • CTO ΍ EM ͳͲɺ૊৫ͷϦʔμʔΛר͖ࠐΜͰ࣮ࢪ
    25

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  26. SRE ͷϏδϣϯɾϛογϣϯɾόϦϡʔΛఆٛ͢Δ
    εςοϓ ۩ମྫ
    ࣮ફʹඞཁͳ৘ใΛूΊΔ اۀɾ૊৫ͷίϯςΩετΛ೺Ѳ͢Δ
    খ࢝͘͞Ίͯɺ܁Γฦ͢ MVV Λ࡞੒͠ɺSREs ʹߜͬͯӡ༻͠ͳ͕ΒվળΛੵ
    ΈॏͶΔ
    νʔϜΛࢧԉ͢Δ Embbedded SRE Λ༻͍ͯɺ֤νʔϜͰ SRE ͷ࣮ફΛ͢
    Δ
    ֶΜͩ͜ͱΛεέʔϧ͢Δ MVV Λϕʔεʹͨ͠Ձ஋؍ͷڞ༗΍ํ޲ੑͷ͢Γ߹Θ
    ͤΛߦ͏
    σʔλυϦϒϯܕͷϚΠϯυηοτΛ۩ମԽ͢Δ SRE ͷ࣮ફʹؔ͢Δ KPI ΛఆΊɺଌఆͷΧϧνϟʔΛ
    ৢ੒͢Δ
    26

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  27. اۀɾ૊৫ίϯςΩετΛ೺Ѳ͢Δ
    27

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  28. લఏ: ձࣾͱ SREs ͷ MVV Λ੔߹ͤ͞Δ
    28

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  29. ͲͷΑ͏ʹاۀɾ૊৫ίϯςΩετͷ೺Ѳ͢Δ͔
    • اۀ΍૊৫Λද͢ม਺Λ͢΂ͯચ͍ग़ͨ͠Γɺܭଌ͢Δ͜ͱ͸
    ࠔ೉
    • → اۀ׆ಈΛ၆ᛌతʹଊ͑ͳ͕ΒɺSRE ʹӨڹͷ͋Δओཁͳม
    ਺Λ੔ཧ͢Δ
    29

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  30. اۀ׆ಈͷશମ૾
    30

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  31. اۀ׆ಈͷશମ૾
    31

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  32. اۀ׆ಈͷந৅Խ
    32

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  33. ૊৫ͷίϯςΩετʹ͓͚Δओཁͳม਺
    1. اۀํ਑ʹؔ͢ΔίϯςΩετ
    2. αʔϏεʹؔ͢ΔίϯςΩετ
    3. ૊৫ʹؔ͢ΔίϯςΩετ
    33

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  34. اۀํ਑ͷίϯςΩετͷ೺Ѳ
    ֬ೝର৅ ۩ମతͳΠϯϓοτྫ ؍఺
    ձࣾͷํ޲ੑ ϛογϣϯɺϏδϣ
    ϯɺόϦϡʔʹؔ͢Δ
    ࢿྉ
    Ͳ͜ʹ޲͔͍ͬͯ͘ͷ
    ͔ɺͳʹΛେ੾ʹͯ͠
    ͍Δͷ͔
    ࣄۀઓུ IRɺࣾ಺޲͚ͷΩοΫ
    Φϑࢿྉ
    ݱࡏͷձࣾͷϑΣʔ
    ζɺࣄۀͷ੒௕ઓུΛ
    ཈͑Δ
    34

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  35. αʔϏεͷίϯςΩετͷ೺Ѳ
    ֬ೝର৅ ۩ମతͳΠϯϓοτྫ ؍఺
    αʔϏε಺༰ αʔϏεઆ໌ࢿྉɺ࣮ࡍʹ
    ࢖ͬͯΈΔ
    ͲͷΑ͏ͳαʔϏεͳͷ͔
    αʔϏεߏ଄ γεςϜߏ੒ਤɺ։ൃϑϩ
    ʔɺϦϦʔεϓϩηε
    ͲͷΑ͏ͳ࢓૊Έͳͷ͔ɺ
    ͲͷΑ͏ʹ։ൃ͞Ε͍ͯΔ
    ͷ͔
    αʔϏε՝୊ Πϯγσϯτͷཤྺɺγε
    ςϜʹ͓͚Δॏཁͳ՝୊
    ͳʹ͕໰୊ʹͳͷ͔
    35

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  36. ૊৫ͷίϯςΩετͷ೺Ѳ
    ֬ೝର৅ ۩ମతͳΠϯϓοτྫ ؍఺
    ૊৫ߏ଄ ૊৫ਤɺνʔϜͷ໾ׂ
    આ໌ࢿྉ
    ͲͷΑ͏ͳνʔϜ͕͋
    Δͷ͔ɺΩʔϚϯ͸୭
    ͳͷ͔
    ৴པੑ΁ͷҙࣝ ϚΠϯυηοτΛௐࠪ
    ͢Δ
    ৴པੑ͕Ͳͷ͘Β͍׆
    ಈʹӨڹ͕͋Δͷ͔
    36

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  37. ิ଍: ૊৫ͷ৴པੑͷϚΠϯυηοτ
    ৴པੑʹؔ͢Δ૊৫ͷϚΠϯυηοτ͸5ͭʹ෼ྨͰ͖Δ4
    ϑΣʔζ આ໌
    Absent ૊৫ʹͱͬͯ৴པੑ͸ޙճ͠ʹͳ͍ͬͯΔঢ়ଶ
    Reactive ௚ۙͰੜͨ͡৴པੑͷ໰୊ͷϑΥϩʔ͕ߦΘΕΔ͕ɺγεςϜ΁ͷ௕ظత
    ͳ౤ࢿ͸΄΅ͳ͍
    Proactive ఆظతͳ૊৫ϓϩηεΛ௨ͯ͡જࡏతͳ৴པੑϦεΫ͕ಛఆ͞Εରॲ͞Ε
    Δ
    Strategic ΞʔΩςΫνϟɺϓϩμΫτɺϓϩηεΛମܥతʹมߋ͢Δ͜ͱͰϦεΫ
    ͷΫϥε؅ཧ͢Δ
    Visionary ৴པੑͷ࠷ߴҐʹ౸ୡ͓ͯ͠Γɺ৴པੑ΁ͷ෯޿͍औΓ૊ΈΛϕετϓϥ
    ΫςΟεΑͼܦݧʹج͍ͮͯࣾ಺֎ͰਪਐͰ͖Δ
    4 What’s your org’s reliability mindset? Insights from Google SREs
    37

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  38. SREs ͷ MVV Λ࡞੒͢Δ
    38

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  39. MVV ࡞੒ͷεςοϓ
    1. CTOɺEMɺSREs ΁ͷώΞϦϯά
    • ແҙࣝతʹ༏ઌ͍ͯ͠Δ͜ͱ
    • ॏཁʹ͍ͯ͠ΔՁ஋؍
    • γεςϜ΍ϫʔΫϑϩʔͷϕετέʔεͷ͢Γ߹Θͤ
    2. ͖ͨͨ୆Λ࡞੒
    • લஈͰ४උͨ͠ίϯςΩετͱώΞϦϯάΛ΋ͱʹ࡞੒
    3. ϨϏϡʔ & मਖ਼
    • Google Docs Λར༻͠ɺSREνʔϜ಺ϨϏϡʔΛඇಉظͰߦ͏
    • େ࿮͕Ͱ͖ͨΒɺ࢖͏ݴ༿ͷબఆ΍χϡΞϯεͷ֬ೝΛಉظతʹߦ͏
    39

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  40. MVV ͷྫ
    40

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  41. Χϧνϟʔͷৢ੒ʹؔ͢Δ KPI ΛఆΊΔ
    Ωʔϫʔυ KPI ͷྫ
    ૉૣ͘σϓϩΠ͢Δ CI/CD ࣌ؒͷܭଌ
    ҆શʹσϓϩΠ͢Δ σϓϩΠޙʹमਖ਼͕ඞཁʹͳΔׂ߹ͷܭଌ
    Ϣʔβʔ͕҆৺ͯ͠࢖͑Δ γεςϜʹ͓͚ΔηΩϡϦςΟج४ͷୡ੒
    ཰ͷܭଌ
    • ։ൃपΓ͸ Agile KPIs Ͱௐ΂Δͱ஌ݟ͕๛෋ʹग़ͯ͘Δ
    • ͦͷଞͷ׆ಈ KPI ͱ૊Έ߹Θͤͯɺࣗࣾͷ "SRE KPIs" ΛఆٛͰ͖ΔͱΑ͍
    41

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  42. ͜͜·Ͱͷ·ͱΊ
    • SRE ͷ࣮ફ͸ 5 ͭͷεςοϓʹ෼͚Δ͜ͱ͕Ͱ͖Δ
    • ঢ়گ೺Ѳ͔Β͸͡·Γɺ૊৫ͷϚΠϯυηοτͷมߋ·Ͱߦ͏
    • 5 ͭͷεςοϓ͸૊৫มֵͷϓϩηεͳͷͰɺණࢁϞσϧΛద༻ͯ͠੔ཧͰ͖Δ
    • ණࢁϞσϧͷԼ͔Β্΁Ξϓϩʔν͢Δྫͱͯ͠ SRE ͷ MVV ߏஙΛ঺հ
    • ํ޲ੑɾՁ஋؍ͷߏங΋ 5 ͭͷεςοϓ͸༗ޮ
    • ၆ᛌతʹاۀ׆ಈΛଊ͑Δ͜ͱͰɺঢ়گ೺Ѳͷ੾ΓޱΛಛఆ
    • ํ޲ੑɾՁ஋؍ͷৢ੒ʹ͓͍ͯ΋ɺσʔλυϦϒϯͷϚΠϯυηοτ͸༗ޮ
    42

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  43. 43

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  44. ؀ڥͷมԽʹΑͬͯ
    ద੾ͳ৴པੑ͸มΘ͍ͬͯ͘
    • αʔϏεΛऔΓר͘؀ڥ͸ɺ࣌ؒܦաͱ
    ͱ΋ʹมԽ͠ଓ͚Δ
    • ಋೖͨ͠΋ͷ͸ɺ؀ڥͷมԽͱͱ΋ʹ࠷
    దͰ͸ͳ͘ͳΔ
    • ؀ڥͷมԽʹରͯ͠ɺͲͷΑ͏ʹཱͪ޲
    ͔͑͹Α͍ͷ͔
    → มԽͷରԠ͢ΔͨΊͷΑ͍Ξϓϩʔν͸
    ͳ͍ͩΖ͏͔
    44

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  45. μΠφϛοΫέΠύϏϦςΟ
    • ͳʹ͕ى͜Δ͔Θ͔Βͳ͍࣌୅ͳͷͰԿ͕ى͖ͯ΋ରԠͰ͖ΔΑ͏ʹ͠Α͏ͱ͍͏ߟ͑ํ
    • ؀ڥ΍ঢ়گ͕ܹ͘͠มԽ͢ΔதͰɺاۀ͕ͦͷมԽʹରԠͯࣗ͠ݾΛมֵ͢Δೳྗ5
    • ҎԼͷ3ͭͷೳྗʹ෼ྨͰ͖Δ
    • ײ஌ʢSensingʣ: ڻҟ΍ةػΛײ஌͢Δೳྗ
    • ัଊʢSeizingʣɿػձΛଊ͑ɺطଘͷࢿ࢈ɾ஌ࣝɾٕज़Λ࠶ߏ੒ͯ͠ڝ૪ྗΛ֫ಘ͢Δೳྗ
    • ม༰ʢTransformingʣɿڝ૪ྗΛ࣋ଓతͳ΋ͷʹ͢ΔͨΊʹɺ૊৫શମΛ࡮৽͠ม༰ͤ͞Δ
    ೳྗ
    5 ৽࣌୅ͷܦӦઓུʮμΠφϛοΫɾέΠύϏϦςΟʯͱ͸Կ͔ʁ
    45

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  46. 3ͭͷೳྗ͸SREͷεςοϓʹඥ෇͚Δ͜ͱ͕Ͱ͖Δ
    1. ࣮ફʹඞཁͳ৘ใΛूΊΔ => Sensing
    2. খ࢝͘͞Ίͯɺ܁Γฦ͢ => Seizing
    3. νʔϜΛࢧԉ͢Δ => Transforming
    4. ֶΜͩ͜ͱΛεέʔϧ͢Δ => Transforming
    5. σʔλυϦϒϯܕͷϚΠϯυηοτΛ۩ମԽ͢Δ =>
    Transforming
    46

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  47. มԽʹΑͬͯੜͨ͡৽͍͠໰୊͸
    ࣗ෼͚ͩͰ͸Χόʔ͖͠Εͳ͍ͷͰ͸ͳ͍͔
    47

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  48. 18.3.5 νʔϜͷྗֶ
    ࢲͨͪ͸ɺSRE ͷιϑτ΢ΣΞ։ൃϓϩδΣΫτʹ
    ܞΘΔΤϯδχΞΛબ୒͢Δࡍʹɺ৽͍͠τϐοΫ
    ʹૉૣ͘ରԠ͍͚ͯ͠ΔθωϥϦετɺ๛෋ͳ஌ࣝ
    ͱܦݧΛ͍࣋ͬͯΔΤϯδχΞΛ૊Έ߹Θͤͯ࠷ॳ
    ͷνʔϜΛ্ཱͪ͛Δ͜ͱͰɺେ͖ͳϝϦοτ͕ಘ
    ΒΕΔ͜ͱʹؾ͖ͮ·ͨ͠ɻ
    ܦݧͷଟ༷ੑʹΑͬͯ໡఺Λͳ͘͢ͱڞʹɺ͢΂ͯ
    ͷνʔϜͷϢʔεέʔε͕ࣗ෼ͷνʔϜͷϢʔε
    έʔεͱಉͩ͡ͱࢥ͍ࠐΜͰ͠·͏མͱ݀͠Λආ͚
    Δ͜ͱ͕Ͱ͖·͢ɻ
    νʔϜʹͱͬͯ͸ɺඞཁͱ͞ΕΔεϖγϟϦετͱ
    ͷؔ܎ੑΛཱ֬͠ɺΤϯδχΞ͕৽͍͠໰୊ྖҬʹ
    ৺஍Α͘औΓ૊ΊΔΑ͏ʹ͢Δ͜ͱ͕ॏཁͰ͢ɻ
    48

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  49. มԽͱଟ༷ੑ
    • 5ͭͷεςοϓΛ܁Γฦ͢͜ͱͰมԽʹରԠͰ͖Δ͕มֵͷ෯ʹ͸ݶք͕͋Δ
    • ૊৫಺Ͱଟ༷ੑΛ޿͛Δ͜ͱͰɺมԽ΁ͷ଱ੑΛڧԽͰ͖Δ
    • SRE ຊͰ͸ɺҟͳΔλΠϓͷΤϯδχΞΛ૊Έ߹Θ͍ͤͯͨ
    • SRE ίϛϡχςΟΛνʔϜͱଊ͑Δͱଟ༷ੑΛ޿͛Δઈ޷ͷػձʹͳΔ
    • มԽʹର͢Δଟ༷ੑʹΑΔରࡦ͸ɺΞϯνϑϥδϟΠϧͷߟ͑ํͷҰ෦Ͱ͋Δ
    • ͞ΒʹରࡦΛߟ͑Δ৔߹͸ɺγεςϜ଱ੑͷΞϓϩʔν͕ࢀߟʹͳΓͦ͏
    49

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  50. ·ͱΊ
    • SRE ࣮ફΛ͢Δ্Ͱॏཁͳ5ͭͷεςοϓΛ঺հ
    • ૊৫Λมֵ͸ɺණࢁͷ্ͱԼͷ྆໘͔Βߦ͑ΔͱΑ͍
    • SRE ͷํ޲ੑɾՁ஋؍Λ໌֬ʹ͢ΔऔΓ૊ΈΛ঺հ
    • ؀ڥͷมԽ΁ͷ଱ੑΛอͭʹ͸ɺ૊৫ͷଟ༷ੑ͕໾ཱͭ
    50

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