YAPC::Kansai - Speaker Deck

YAPC::Kansai

by papix

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PerlͷWebΞϓϦέʔγϣϯΛ σϓϩΠ͢Δ࣌ʹ ๻ୡ͕ߟ͑ͨ͜ͱ papix (Hatena Co., Ltd.)

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͸͡Ίʹ

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Θͨ͠Ͱ͢

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͸ͯͳ͔Βདྷ·ͨ͠

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ͭͬͯ͘·͢

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papix • Twitter: @__papix__ • GitHub: papix • CPAN: PAPIX • Blog • Technology: http://papix.hatenablog.com/ • My Life: http://papix.hatenablog.jp/

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PerlͷWebΞϓϦέʔγϣϯΛ σϓϩΠ͢Δ࣌ʹ ๻ୡ͕ߟ͑ͨ͜ͱ papix (Hatena Co., Ltd.)

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σϓϩΠͱ͸?

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σϓϩΠͱ͸? • WebαʔϏε͸(େ఍)ࣗ෼ͷPCͰ։ൃ͢Δ • ͦͷαʔϏεΛ, Ϣʔβʹ࢖ͬͯ΋Β͏ʹ͸? • Կ͔͠ΒͷαʔόʹňσϓϩΠŉͯ͠, • ňγεςϜΛར༻Մೳͳঢ়ଶʹŉ͠ͳ͚Ε͹  ͳΒͳ͍

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αʔϏεͷ྆ྠ • ň։ൃŉͱňσϓϩΠŉ͸αʔϏεͷ྆ྠ • ։ൃ, σϓϩΠ, ։ൃ, σϓϩΠ… • ͦͷͨΊ, σϓϩΠͷॏཁ౓͸ߴ͍! • σϓϩΠͳͯ͘͠αʔϏεͳ͠!!!!

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σϓϩΠͷॏཁੑ • αʔϏεͷՁ஋ΛߴΊΔҝʹඞཁෆՄܽ • ϢʔβͷମݧΛଛͶͳ͍Α͏ʹ… • ͳΔ΂͘μ΢ϯλΠϜͳ͘… (ແఀࢭͰ) • σϓϩΠࣦഊͰαʔϏε͕௕ظؒࢭ·Δ • ΦϖϨʔγϣϯϛεͰσʔλ͕ফ͑Δ

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σϓϩΠʹਖ਼ղͳ͠ • Ԧಓ(ύλʔϯ)͸͋Δ΋ͷͷ, ม਺͕ଟ͍ • αʔϏεͷػೳ, Πϯϑϥߏ੒, ։ൃऀͷ਺, Ϣʔβ਺, ར༻͢Δݴޠ, WAF, ϛυϧ΢ΣΞ, อଘ͢Δσʔλͷྔ… • ͍Ζ͍Ζͳ΋ͷͱ޲͖߹͏ඞཁ͕͋Δ

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αʔϏεͱਐԽ͢ΔσϓϩΠ • αʔϏεͷਐԽʹ൐͍࠷ળղ͕มΘ͍ͬͯ͘ • ࠷ॳ͸खಈͰ΋͍͚ΔΑͶ • खಈͩͱΦϖϛε͢Δ͔ΒࣗಈԽ͍ͨ͠Ͷ • ୆਺૿͑Δͱਏ͍͔Βฒྻ࣮ߦ͍ͨ͠Ͷ • etc…

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σϓϩΠʹ͍ͭͯ࠷ۙࢥ͏ࣄ • (ۀ຿ͷ৔߹)ඞཁ࠷௿ݶʹཹΊΔ • ࠷ॳ͔Βཧ૝Λ࣮ݱ͢Δͱ, ίετߴ͍ • ΦʔόʔςΫϊϩδʔʹ૸Γ͕ͪ • Ҿ͖ܧ͗΋େมʹͳͬͯ͠·͏… • ͍ͭͰ΋ۀ຿Ͱ࢖͑ΔΑ͏ʹ, झຯͷྖҬͰ৽͍͠΍Γํ, πʔϧΛࢼͤΔͱྑ͍!

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σϓϩΠʹ͍ͭͯ ߟ͑Δ

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σϓϩΠʹࢥ͍Λ஘ͤΔ • ͪΌΜͱͨ͠σϓϩΠΛ࣮ݱ͢Δʹ͸? • ͍Ζ͍Ζͳࣄͱ޲͖߹͏ඞཁ͕͋Δ • ݱ࣮ͱ޲͔͍߹͍͖ͬͯ·͠ΐ͏ • ੒ޭ͸, టष͍࡞ۀͷੵΈॏͶͷઌʹ͋Δ

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͍Ζ͍Ζͳ΋ͷͱ ޲͖߹͓͏

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Ͳ͜ʹσϓϩΠ͢Δ? • αʔϏε͕ಈ͘Πϯϑϥͱ޲͖߹͏ • VPS (Virtual Private Server) • IaaS (Infrastructure as a Service) • PaaS (Platform as a Service) • ΦϯϓϨαʔό / ࣗ୐αʔό

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ԿΛσϓϩΠ͢Δ? • αʔϏεͦͷ΋ͷͱ޲͖߹͏ • όον΍ϫʔΧʔ͸͋Δ͔? • ϞϊϦγοΫ? ϚΠΫϩαʔϏε? • JavaScript͸͋Δ͔? ͦͷϏϧυ͸? • ϥΠϒϥϦͷΠϯετʔϧ/ߋ৽͸?

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Ͳ͏΍ͬͯσϓϩΠ͢Δ? • αʔϏε΍, ར༻͢Δϛυϧ΢ΣΞͱ޲͖߹͏ • Ͳ͏΍ͬͯϓϩηεΛಈ͔͔͢? • αʔϏεͷ࠶ىಈ͸Ͳ͏͢Δ͔? • RDBMSͷϚΠάϨʔγϣϯ͸ඞཁ͔? • ΩϟογϡͷഁغͳͲߟྀ͠ͳ͍ͱ͍͚ͳ͍͔?

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ͲΜͳσϓϩΠʹ͢Δ? • αʔϏεΛ։ൃ͢ΔνʔϜͱ޲͖߹͏ • σϓϩΠʹ࢖͑Δίετ͸? (ίετ) • खಈͰ͢Δ? ࣗಈԽ͢Δ? (ࣗಈԽ౓) • σϓϩΠ͸ແఀࢭ? ϝϯςΛೖΕΔ? (Մ༻ੑ) • ͲΕ͚ͩσϓϩΠ͍ͨ͠? (σϓϩΠස౓)

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ňσϓϩΠͷϏδϣϯŉ͸େࣄ • ňͲΜͳσϓϩΠʹ͢Δŉʹ͋ͨΔ෦෼ • ܦݧଇͱͯ͠, ͜ͷลΓͷ߹ҙ/ܭը͕ࡶͩͱ, Φʔ όʔςΫϊϩδʔʹ૸Γ͕ͪ • ଞͷཁૉʹൺ΂, ׂͱࣗ༝౓͕ߴ͍(ͱࢥ͏) • झຯαʔϏεͰ͋Ε͹, νʔϜ = ࣗ෼ͳͷͰ޷͖উ ख΍ΕΔ!!!

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ίετͷྫ • ໌೔ϦϦʔε͔ͩΒͳΔ͸΍Ͱ! • සൟʹϦϦʔε͢Δ͠, ͔ͬ͠Γ࡞Γࠐ΋͏! • طଘͷࢿݯΛར༻ͯ͠, γϡοͱग़དྷͳ͍?

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ίετͷิ଍ • ߏஙίετͱ࣮ࢪίετ͕͋Δ • ߏஙίετˢ ͩͱ, ࣮ࢪίετ ↓ (ࣗಈ) • ߏஙίετ ↓ ͩͱ, ࣮ࢪίετ ↑ (खಈ) • ࡶͳϏδϣϯͰਐΊΔͱͲͪΒ΋ΞήΞήʹ...

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ࣗಈԽ౓ͷྫ • 1ίϚϯυͰσϓϩΠΛશͯ׬ྃͤ͞Α͏! • ్தͰ֬ೝΛڬΈ͍ͨͷͰ, ز͔ͭͷϑΣΠζ ʹ෼͚ͯ, ͦΕͧΕίϚϯυΛ࣮ߦ͠Α͏ • શ෦खಈͰ΍Ζ͏! (ਖ਼ؾ͔!?)

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ࣗಈԽ౓ͷิ଍ • ઌʹ঺հͨ͠ňίετŉʹӨڹΛ༩͑Δ • ࣗಈԽ౓ΛߴΊΕ͹ߴΊΔ΄Ͳ, ࢦ਺ؔ਺తʹ ίετ͕૿͍͑ͯ͘ (ͱࢥ͏) • νʔϜ/αʔϏεʹԠͯ͡ద౓ʹखಈ࡞ۀͷ ཁૉΛڬΜͰ͍͘ͷ͕େࣄͳͷͰ͸?

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Մ༻ੑͷྫ • σϓϩΠ͸ແఀࢭ(ϊʔϝϯς)Ͱ΍Γ͍ͨ! • ਂ໷Ͱ͋Ε͹X෼ͷఀࢭ͸ڐ༰Ͱ͖ΔͶ • ݄ʹXճ͸αʔϏεΛࢭΊͯσϓϩΠͰ͖ͦ͏

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Մ༻ੑͷิ଍ • SLA(Service Level Agreement)ʹ΋ؔΘͬͯ͘Δ • झຯͷαʔϏεͰ͋Ε͹, ϦϦʔεͷ౓ʹఀࢭ͠ ͯ΋ౖΒΕΔ͜ͱ͸ͳͦ͞͏ • ޿͘࢖ΘΕΔαʔϏε, ج൫తαʔϏεͩͱ,  ͳΔ΂͘ແఀࢭͰσϓϩΠͰ͖ΔΑ͏ʹ͍ͨ͠!

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σϓϩΠස౓ͷྫ • 1೔ʹ10ճ͘Β͍σϓϩΠ͍ͨ͠! • िʹ1ճσϓϩΠͰ͖Ε͹े෼͔ͳ... • 1ճ͋ͨΓX෼ͰσϓϩΠ͍ͨ͠!

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σϓϩΠස౓ͷิ଍ • αʔϏε։ൃॳظͰ͸ॏཁͳཁૉ • σϓϩΠճ਺ = ϢʔβʹՁ஋Λಧ͚Δࢼߦνϟϯε਺ • ௿ίετͰ, 1೔ʹԿ౓΋σϓϩΠग़དྷΔͱྑ͍ • ྫ: GitHub (1೔100ճҎ্σϓϩΠ!) • ࠓ΋͍ͯ͠Δͷ͔ͳ...?

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Ϗδϣϯ͕ࡶͩͱى͖Δ͜ͱ • σϓϩΠස౓͕௿͍ͷʹ, ϐλΰϥεΠονతʹ  શࣗಈԽ͞ΕͨϞϊ͕࢓্͕ͬͨΓ... • ͦͷίετͰαʔϏε։ൃΛޙԡ͠Ͱ͖ͨͷͰ͸!? • ࡶʹਐΊͯ, ΍͚ʹ࣌ؒͷ͔͔ΔϞϊ͕࢓্͕ͬͨΓ... • Ұ೔ʹԿ౓΋σϓϩΠ͍ͨ͠ͷʹ…!

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࢓૊ΈΛม͑Δ೉͠͞ • Ұ౓࡞ͬͨ࢓૊Έ(͜͜Ͱ͸σϓϩΠ)Λޙ͔Βม͑ͯ ͍͘ͷ͸ඇৗʹ೉͍͠! • ຬͨ͢΂͖σϓϩΠͷϏδϣϯ(৚݅)͕͋ΔͳΒ, ຬͨͤΔΑ͏ʹ࠷ॳ͔ΒؤுΔ΂͖! • (࠷ॳ͔ΒϏδϣϯ͕ఆ·͍ͬͯͯ, ͣͬͱมΘΒͳ͍ ͳΒۤ࿑͠ͳ͍࿩Ͱ͸͋Γ·͢!)

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WebΞϓϦέʔγϣϯͷ σϓϩΠઓུ

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खಈΦϖϨʔγϣϯ • αʔόʹ઀ଓͯ͠, खͰίʔυΛೖྗ • ίϚϯυΛؒҧ͑ͳ͍Α͏ʹ, खॱॻΛ࡞Δ • ͱ͸͍͑, ਓؒͳͷͰͨ·ʹؒҧ͑Δ…! • αʔόʔͷ୆਺͕૿͑Ε͹, ΦϖϛεͷՄೳੑ΋ ૿͍͑ͯ͘…

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γΣϧεΫϦϓτʹΑΔࣗಈԽ • Ұ࿈ͷσϓϩΠॲཧͷͨΊͷίϚϯυΛ,  γΣϧεΫϦϓτͰ·ͱΊ࣮ͯߦ͢Δ • σϓϩΠͷखॱΛίʔυʹམͱ͠ࠐΉ • ίʔυͳͷͰ࣮ߦग़དྷΔ, ಡΊΔ, मਖ਼Ͱ͖Δ! • ͜Ε΋୆਺͕૿͑ͯ͘Δͱ, ֤αʔόͰεΫϦϓτΛ࣮ ߦ͢Δͷ͕େมʹͳͬͯ͘Δ…

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πʔϧΛ࢖ͬͨࣗಈԽ/ฒྻԽ • ୅දྫ͸CapistranoͳͲ • ༧ΊσϓϩΠઌͱͳΔαʔόΛొ࿥͢Ε͹, ί Ϛϯυ1ͭͰશͯͷαʔόʹσϓϩΠՄೳ • ศརͳϔϧύʔ͕͋Γ, ίʔυͰσϓϩΠखॱ Λߏங͠΍͍͢

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πʔϧΛ࢖ͬͨࣗಈԽ/ฒྻԽ • αʔόͷ؀ڥΛߏங͢ΔπʔϧͰߦ͏৔߹΋ • Ansible, Chefͱ͍ͬͨϓϩϏδϣχϯάπʔ ϧͷ׆༻ • ؀ڥߏஙͱσϓϩΠΛҰؾ௨؏Ͱಉ͡πʔϧͰ ࣮ݱͰ͖Δ • ࠷ॳͷҰาͱͯ͠Φεεϝ

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πʔϧΛ࢖ͬͨࣗಈԽ/ฒྻԽ • ۀ຿Ͱ͸, ͜ͷล·Ͱ͸”ී௨ʹ"΍Δࣄ͕ଟ͍ • Infrastructure as CodeͷྲྀߦΓͱ͔… • ίʔυԽ͢Δ͜ͱͰ, ଞνʔϜͷίʔυ/஌ݟΛྲྀ༻ ͠΍͍͢ͱ͍͏ͷ΋͋Δ • ୠ͠, ΍Γ͗͢Δͱࣾ಺ͰňΨϥύΰεతਐԽŉΛ͢Δ ͜ͱ΋...

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ߋͳΔਐԽͷํ޲ੑ • ň੒Ռ෺Λར༻͢Δŉޮ཰ͷྑ͍σϓϩΠ • BotΛ࢖ͬͨChatOps • CIπʔϧ, SaaSͷ׆༻ • σϓϩΠͷ׬શࣗಈԽ

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ň੒Ռ෺Λར༻͢ΔŉσϓϩΠ

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GitΛ࢖ͬͨσϓϩΠ • GitΛ࢖͍ͬͯΔ৔߹Λߟ͑Δ • GitHub, BitBucketͳͲ... • ϦϙδτϦʹ͋ΔίʔυΛσϓϩΠ͢Δ • ී௨ʹσϓϩΠ͢Δͱ, Ͳ͏͍͏खॱʹͳΔ?

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GitΛ࢖ͬͨσϓϩΠ • ࣍ͷΑ͏ͳॲཧΛCapistranoͳͲͰߦ͏: • σϓϩΠର৅ͷαʔόͷGitϦϙδτϦΛߋ৽ • ϥΠϒϥϦͷΠϯετʔϧ౳, ϏϧυΛ࣮ߦ • ΞϓϦέʔγϣϯΛ࠶ىಈ • αʔό͕ෳ਺ଘࡏ͢Δ৔߹, ͦͷ֤ʑͰ࣮ࢪ͢Δ

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໰୊఺͸? • GitϦϙδτϦʹෛ୲͕͔͔Δ • Ұ౓ʹෳ਺ͷαʔό͕GitϦϙδτϦΛಡΈऔΓʹߦ͘ • Ϗϧυʹ͔͔Δίετ(Ϧιʔε, ࣌ؒ)͕ແବ • શͯͷαʔόͰ, `carton install`ͳͲ͕࣮ߦ͞Εͯ͠·͏ • JavaScriptͷϏϧυͳͲ΋ಉ༷

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ň੒Ռ෺Λར༻͢ΔŉσϓϩΠ • ༧Ί, σϓϩΠ͍ͨ͠ίʔυΛϏϧυ͓ͯ͘͠ • CIαʔόͷδϣϒͱͯ͠ߦ͏͜ͱ͕ଟ͍ • ͦͷň੒Ռ෺ŉ͝ͱ, ίʔυΛtarͳͲͰݻΊΔ • `local`σΟϨΫτϦ, Ϗϧυͨ͠JavaScript...

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ň੒Ռ෺Λར༻͢ΔŉσϓϩΠ • tar͸S3ʹ഑ஔ͓ͯ͘͠ • S3ͳͷͰ, ಉ࣌ΞΫηε౳ʹ΋ڧ͍ • σϓϩΠର৅ͷαʔό͸, S3͔ΒtarΛऔಘ,  ల։ͯ͠࠶ىಈ͢Ε͹σϓϩΠ׬ྃ • ͦΕͧΕͷαʔόͰϏϧυ͕ඞཁͳ͘ͳΔ

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ň੒Ռ෺Λར༻͢ΔŉσϓϩΠ • Consul + StretcherΛ࢖ͬͨύλʔϯ • ʲະঝ୚޿ࠂʳ͜ͷޙͷmacopy͞Μͷ  τʔΫͰ, ΧϠοΫʹ͓͚Δ۩ମྫͳͲ͕  ޠΒΕΔͷͰ͸!? • ͳͷͰ, ͜͜Ͱ͸େ·͔ͳ֓ཁͷΈ͓࿩͠·͢

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Consul + Stretcher • Stretcher • ΧϠοΫͷ@fujiwara͞Μۘ੡ • HashiCorp੡”Consul”ͷeventΛར༻ͨ͠  σϓϩΠπʔϧ

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Consul + Stretcher http://techblog.kayac.com/10_stretcher.html

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Consul + Stretcher • ։ൃऀ͸ConsulʹeventΛ౤͛Ε͹OK! • Consul/StretcherΛ࢖Θͣ, CapistranoͰ  ֤αʔόʹtarΛऔಘͤ͞, ల։ͯ͠࠶ىಈͱ͍ ͏΍Γํ΋͋ΓಘΔ

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BotΛ࢖ͬͨChatOps

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ChatOps (Hubot) • Botʹ͓ئ͍͢Ε͹σϓϩΠ͕ಈ͘ • Botͱ͸νϟοτπʔϧ(Slack౳)Ͱަྲྀ • ňσϓϩΠͷՄࢹԽŉʹ΋ͭͳ͕Δ • σϓϩΠͷ༷ࢠ͕νϟοτͰՄࢹԽͰ͖Δ • ਐḿͱ͔, ໰୊ͳͦ͞͏͔ͱ͔, ײ͡΍͍͢

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CIπʔϧ/SaaSͷ׆༻

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CIπʔϧ • ༷ʑͳҰ࿈ͷॲཧ(Job)Λ؅ཧ/࣮ߦͯ͘͠ΕΔ • σϓϩΠͷҝͷॲཧΛ؅ཧͤ͞Δ • Jenkins, Concourse CI, Circle CIͳͲ… • ཤྺ΍ϩά΋࢒ΔͷͰ, ҆৺ײ͕͋Δ

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Jenkins • σϑΝΫτελϯμʔυײ͕͋Δ • ࠷ۙ2.0͕ग़ͯ, Jenkinsﬁleͱ͍͏֓೦͕ొ৔ • ίʔυͰδϣϒΛ؅ཧग़དྷΔΑ͏ʹͳͬͨ! • JenkinsΛ؅ཧ͢Δ͜ͱΛňհޢŉͱݺΜͩΓ…

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Concourse CI • PivotalͷύΠϓϥΠϯܕCIπʔϧ • ݟͨ໨͕ΊͬͪΌΠέͯΔ, ͔͍͍ͬ͜ • DockerΛ࢖͍ͬͯͯ, δϣϒ͕Dockerͷ্ Ͱಈ࡞͢ΔͷͰ, ؀ڥߏஙָ͕ͪΜ

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Concourse CIͷ༷ࢠ https://qiita-image-store.s3.amazonaws.com/0/1852/4e14e419-5b1f-75f6-f623-6aac28c9788f.png

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SaaSͳCI • Travis • GitHubͷpublicϦϙδτϦ͸ແྉͰ࢖͑Δ • ଞʹ΋Circle CI, WerckerͳͲ... • ΋ͪΖΜSaaSͳͷͰ, ༗ྉͳࣄ͕ଟ͍Ͱ͢

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Mackerel • ͸ͯͳͷαʔό؅ཧ/؂ࢹͷͨΊͷSaaS • σϓϩΠͷҝʹ͸ňαʔόͷ؅ཧŉ΋ॏཁ • ňͲͷαʔόʹσϓϩΠ͢Δ͔?ŉ • Capistrano + Mackerelͷྫ • σϓϩΠର৅ͷαʔόΛMackerel͔ΒΑ͠ͳʹݟ͚ͭͯ͘ΕΔ • https://mackerel.io/ja/docs/entry/advanced/capistrano-2.x

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σϓϩΠͷ׬શࣗಈԽ

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σϓϩΠͷ׬શࣗಈԽ • ͜͏͍ͬͨ࢓૊ΈΛ૊Έ߹ΘͤΕ͹, σϓϩΠͷ׬શࣗಈ Խ΋࣮ݱͰ͖Δ • GitHubʹpushͨ͠ΒσϓϩΠ׬ྃ! • ୠ͠, ׬શࣗಈԽʹ΋ϦεΫ͸͋Δ • ňਓؒͷख͕ೖΔ༨஍ŉ͸͋Δछͷ҆શห • લड़ͷ௨Γ, ňͲ͜·ͰࣗಈԽ͢Δ͔?ŉΛߟ͑Δ

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σϓϩΠͱϚΠάϨʔγϣϯ

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αʔϏεͱσʔλ • αʔϏε͕ར༻͢Δσʔλͷ؅ཧʹ͍ͭͯ΋ ߟ͑ͳ͚Ε͹͍͚ͳ͍ • RDBMSʹσʔλΛอଘͨ͠Γ… • KVSΛར༻ͨ͠Γ… • ΦϒδΣΫτετϨʔδΛར༻ͨ͠Γ...

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εΩʔϚͷมߋ • ΞϓϦέʔγϣϯͷσϓϩΠʹ൐ͬͯ, RDBMSͷεΩʔϚΛมߋ͍ͨ͠৔߹΋͋Δ • ৽͍͠ςʔϒϧΛ༻ҙ͍ͨ͠ • ςʔϒϧʹΧϥϜΛ௥Ճ͍ͨ͠ • εΩʔϚͷมߋ -> ϚΠάϨʔγϣϯ

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ϚΠάϨʔγϣϯ͢Δ • SQLͷALTERจΛ௚઀ଧͭ • GitDDL, GitDDL::Migrator, Anego౳͸, ͦͷࢧԉ Λ͢Δπʔϧୡ • pt-osc • Trigger౳Λۦ࢖ͯ͠, ͍͍ײ͡ʹϚΠάϨʔγϣϯ Λͯ͘͠ΕΔ܅

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ϚΠάϨʔγϣϯͷ೉͠͞ • ALTERจͷ࣮ߦʹͲΕ͚͕͔͔ͩ࣌ؒΔ͔? • ϚΠάϨʔγϣϯޙ΋ΞϓϦ͸ಈ͔͘? • σϓϩΠલͷΞϓϦέʔγϣϯ͕, RDBMS ͷϚΠάϨʔγϣϯޙ΋ਖ਼͘͠ಈ͘ͳΒ,  ແఀࢭͰσϓϩΠ΋Ͱ͖Δ

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Graceful Restart

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Tl;dr • @shibayu_36͞ΜͷΤϯτϦΛಡ΋͏! • ňServer::Starter͔ΒֶͿhot deployͷ࢓૊Έŉ  http://blog.shibayu36.org/entry/ 2012/05/07/201556 • τοϓΫϥεʹΘ͔Γ΍͍͢Graceful Restart ͷࢿྉͰ͢

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Graceful Restart • σϓϩΠ࣌ʹ͸ϓϩηεͷ࠶ىಈ͕ඞཁ • มߋͨ͠ίʔυΛద༻͢ΔͨΊ • ී௨ʹ࠶ىಈ͢Δͱ, ͦͷॠ͚ؒͩϦΫΤετΛࡹ͚ͳ͘ ͳͬͯ͠·͏ • αʔϏε͕ॠؒతʹμ΢ϯ͢Δ! • ͦ͜ͰGraceful Restart (༏խͳϦελʔτ)

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