入門、Kubernetes Persistent Volume

by Yukinori Sakashita

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ೖ໳ɺ ,VCFSOFUFT1FSTJTUFOU7PMVNF :VLJOPSJ4BLBTIJUB

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ࣗݾ঺հ ‣ٕज़ݚڀΤϦΞ ӡ༻؅ཧٕज़ Ϋϥ΢υ αʔόετϨʔδ ࣗಈࣗ཯ίϯϐϡʔςΟϯά "*.- // ).. #BZFTJBO/FUXPSL ‣৬ྺ ૯߹ిػϝʔΧʔ 㾎ݚڀॴ ओ೚ݚڀһ 㾎ւ֎ݚڀॴ!γϦίϯόϨʔ ϥϘ௕ αʔόϕϯμʔ ςΫχΧϧ4& 2 ࡔԼ޾ಙ ത࢜ :VLJOPSJ4BLBTIJUB 1I% ‣ ϠϑʔגࣜձࣾθοτϥϘגࣜձࣾ ‣ 4/*"೔ຊࢧ෦ٕज़ҕһձ෭ҕһ௕ ‣ 4/*" 64 5FDIOJDBM$PVODJM"EWJTPS

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"HFOEB ॳ৺ऀ޲͚ετϨʔδͷ͋Ε͜Ε ,VCFSOFUFTʹ͓͚ΔετϨʔδϞσϧͱಈ͖ Α͋͘Δ࣭໰ͱͦͷճ౴ 3

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ॳ৺ऀ޲͚ετϨʔδͷ ͋Ε͜Ε

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ॳ৺ऀ͕ࠞಉ͠΍͍͢ϫʔυ 5 3FBE 8SJUF ϒϩοΫ ϑΝΠϧ ΦϒδΣΫτ 4$4* J4$4* $JOEFS /7.F P' $4* 1SPWJTJPOJOH "UUBDI %FUBDI 4XPSEpTI ؅ཧ"1* 4"/ σʔλϓϨʔϯʹؔ࿈͢Δϫʔυ ίϯτϩʔϧϓϨʔϯʹؔ࿈͢Δϫʔυ ‣ σʔλϓϨʔϯσʔλ֨ೲͱసૹॲཧΛ୲͏ ‣ ίϯτϩʔϧϓϨʔϯ؅ཧ"1*ͳͲͷॲཧΛ୲͏

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ϒϩοΫετϨʔδ ϑΝΠϧετϨʔδ ΦϒδΣΫτετϨʔδ ΞʔΩςΫνϟ ಛ௃ w಺ଂυϥΠϒͱಉ͡3BXσόΠε wϑΝΠϧγεςϜ͸ࣗ༝ʹબ୒ wωοτϫʔΫυϥΠϒ wϑΝΠϧγεςϜ͸ετϨʔδ೚ ͤɺมߋෆՄ wΦϒδΣΫτ୯ҐͰΞΫηε wϑΝΠϧγεςϜʹґଘ͠ͳ͍ ͨΊɺେྔσʔλΛ֨ೲՄೳ σʔλసૹϓϩτίϧ J4$4* '$ /7.F /'4 4.# )5514 )551 Ϛ΢ϯτύεͷྫ EFWTEB aaaTIBSFaIPHF IUUQTBBBPSHTUPSBHFIPHF ੑೳ )JHI .JEEMF -PX ओͳ༻్ %# 04 #PPU%JTL ϑΝΠϧͷڞ༗ ࣸਅɺಈը֨ೲ ετϨʔδछผ 6 J4$4* /"44FSWFS /'4 4.# ,74 )55144FSWFS )5514 )PTU )PTU )PTU Ұൠతͳ܏޲Ͱ͋Γ੡඼ʹΑΓมΘΓ·͢ 4$4* 4$4*

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,VCFSOFUFTʹ͓͚Δ ετϨʔδϞσϧͱಈ͖

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1FSTJTUFOUͱ͸ ‣ &QIFNFSBM ͸͔ͳ͍ɺ୹໋ 1PEͷ࡟আ࠶σϓϩΠͱಉ࣌ʹσʔλ͕ফ͑Δ FNQUZ%JS7PMVNF MPHEJSFDUPSZ XSJUBCMFMBZFST ‣ 1FSTJTUFOU ࣋ଓతɺӬଓੑ 1PE͕࡟আ࠶σϓϩΠ͞Εͯ΋σʔλ͸ফ͑ͳ͍ 1FSTJTUFOU7PMVNF 17 8 bin/lib Container App Logic Data

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$/$'$MPVE/BUJWF-BOETDBQF 9 3FG$/$'MBOETDBQF IUUQTHJUIVCDPNDODGMBOETDBQF

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10 3FG$/$'MBOETDBQF IUUQTHJUIVCDPNDODGMBOETDBQF $MPVE/BUJWF4UPSBHF

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‣ ,VCFSOFUFTW ` $4* "MQIB ‣ ,VCFSOFUFTW ` -PDBM7PMVNF #FUB ‣ ,VCFSOFUFTW ` 7PMVNF3FTJ[JOH ‣ ,VCFSOFUFTW ` 7PMVNF4OBQTIPU "MQIB 5PQPMPHZ"XBSF7PMVNF 1SPWJTJPOJOH #FUB 11 ‣ ,VCFSOFUFTW ` $4* (" ‣ ,VCFSOFUFTW ` -PDBM7PMVNF (" ‣ ,VCFSOFUFTW ` $4*7PMVNF$MPOJOH "MQIB ‣ ,VCFSOFUFTW ` $4*7PMVNF$MPOJOH #FUB ,VCFSOFUFTͰͷαϙʔτػೳཤྺ

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ετϨʔδͷϞσϧ ‣ ϕϯμʔχϡʔτϥϧͳϞσϧ 1FSTJTUFOU7PMVNF$MBJN 1FSTJTUFOU7PMVNF 4UPSBHF$MBTT ‣ ؅ཧऀͱϢʔβͷ໾ׂΛߟྀͨ͠Ϟσϧ ‣ ετϨʔδ૷ஔͷૢ࡞ͳ͠Ͱ7PMVNFΛ  ίϯςφʹࣗಈͰϚ΢ϯτ ‣ ओʹϒϩοΫετϨʔδϑΝΠϧ  ετϨʔδ͕ର৅ 12 Ϣʔβ ؅ཧऀ

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ετϨʔδϦιʔεͷൣғͱݖݶ ‣ 4UPSBHF$MBTT 1FSTJTUFOU7PMVNF͸શͯͷ/BNFTQBDFͰڞ௨ͷϦιʔε Ϋϥελશମͷ؅ཧऀݖݶ͕ඞཁ $MVTUFS3PMFͱόΠϯσΟϯά͞ΕͨΞΧ΢ϯτ ‣ 1FSTJTUFOU7PMVNF$MBJN͸/BNFTQBDF͝ͱͷϦιʔε /BNFTQBDFEΦϒδΣΫτ΁ͷಡΈॻ͖ͷݖݶ͕ඞཁ 3PMFͱόΠϯσΟϯά͞ΕͨΞΧ΢ϯτ 13 LVCFDUMBQJSFTPVSDFT /".&4)035/".&4"1*(3061/".&41"$&%,*/% QFSTJTUFOUWPMVNFDMBJNTQWDUSVF1FSTJTUFOU7PMVNF$MBJN QFSTJTUFOUWPMVNFTQWGBMTF1FSTJTUFOU7PMVNF TUPSBHFDMBTTFTTDTUPSBHFLTJPGBMTF4UPSBHF$MBTT

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1FSTJTUFOU7PMVNF$MBJN QWD ‣ 7PMVNFͷཁٻ࢓༷Λද͢Ϧιʔε 4UPSBHFUZQF 4UPSBHF$MBTT໊ 7PMVNFTJ[F "DDFTTNPEF 14

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ϩοΫϝΧχζϜͷҧ͍ ‣ ϒϩοΫετϨʔδ -#" ࿦ཧϒϩοΫΞυϨογϯά ͷΞΫηε ͷͨΊɺϩοΫϝΧχζϜΛ͍࣋ͬͯͳ͍ ୆ͷϗετ͔ΒͷΈ8SJUFͱͳΔΑ͏ʹ  Ϛ΢ϯτ͢Δඞཁ͋Γ ‣ ϑΝΠϧετϨʔδ ϑΝΠϧ୯ҐͰͷϩοΫϝΧχζϜ͋Γ 0QFO࣌ʹऔಘͨ͠ϩοΫΛଞϗετʹ΋఻ൖ ෳ਺୆ͷϗετ͔Β3FBE8SJUF͕Մೳ 15 )PTU )PTU )PTU )PTU 3FBE8SJUF 3FBE 3FBE8SJUF 3FBE8SJUF )PTU ͕ഉଞϩοΫͰ ։͍͍ͯΔΑ pMF ϒϩοΫετϨʔδ ϑΝΠϧετϨʔδ

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"DDFTT.PEFT 16 /PEF /PEF 3FBE 3FBE 3FBE8SJUF0ODF 380 3FBE0OMZ.BOZ 309 /PEF /PEF 3FBE8SJUF.BOZ 389 ‣ ͭͷ/PEF͔Β3FBE 8SJUFͰϚ΢ϯτͰ͖Δ ‣ ෳ਺ͷ/PEF͔Β3FBE 0OMZͰϚ΢ϯτͰ͖Δ ‣ ෳ਺ͷ/PEF͔Β3FBE 8SJUFͰϚ΢ϯτͰ͖Δ /PEF 3FBE8SJUF 3FBE8SJUF 3FBE8SJUF

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1FSTJTUFOU7PMVNF QW ‣ 7PMVNFΛද͢Ϧιʔε 4UPSBHFUZQF 4UPSBHF$MBTT໊ 4J[F "DDFTTNPEFT 3FDMBJNQPMJDZ w 3FUBJO w 3FDZDMF w %FMFUF 17

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3FDMBJN1PMJDZ ‣ 17$Λ࡟আͨ࣌͠ɺ17ΛͲ͏͢Δ͔ΛܾΊΔϙϦγʔ 18 17$࡟আ 17$࡟আ 17$࡟আ ͦͷ·· σʔλΛ  ࡟আ 17Λ࡟আ 3FUBJO 3FDZDMF %FQSFDBUFE %FMFUF

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4UPSBHF$MBTT TD ‣ ετϨʔδϓʔϧΛද͢Ϟσϧ /BNF 3FDMBJNQPMJDZ 1SPWJTJPOFS ‣ 1SPWJTJPOFS͕ετϨʔδ૷ஔͷ  "1*Λݺͼग़͠ 19

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$4* $POUBJOFS4UPSBHF*OUFSGBDF ‣ ίϯςφΦʔέετϨʔγϣϯ޲͚ͷඪ४࢓༷ ‣ ೥݄ʹ࠷ॳͷύϒϦοΫϦϦʔε ‣ ओཁͳίϯςφΦʔέετϨʔγϣϯ͕࠾༻  ,VCFSOFUFT $MPVE'PVOESZ .FTPT %PDLFS FUD ‣ ,VCFSOFUFTͰ͸ʹͯ("αϙʔτ ‣ ,VCFSOFUFTͷιʔεπϦʔ JOUSFF Ͱ؅ཧ͞Ε͍ͯͨετϨʔδ૷ஔʹ  ؔ࿈͢Δ࣮૷͕ɺSEϕϯμͰಠࣗʹ։ൃఏڙ͢Δ͜ͱ͕Մೳ 20

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4UBUFGVM4FU TUT 21 ‣ 1FSTJTUFOU7PMVNF 1FSTJTUFOU7PMVNF$MBJNΛศར͔ͭ҆શ ʹ࢖͏ͳΒ4UBUFGVM4FU͕Φεεϝ ‣ ಛ௃ 1PE໊ʹ࿈ଓͨ͠൪߸Λ෇༩ FH NZTRM NZTRMʜ 1PEΛߋ৽͢Δ৔߹ɺඞͣલͷ൪߸ͷ1PEͷॲཧ͕׬ྃͯ͠ ͔Β࣮ߦ 1PEͷੜ੒࣌ʹ17$Λࣗಈੜ੒ͯ͘͠ΕΔ 7PMVNF$MBJN5FNQMBUFT͋Γ 4UBUFGVM4FUΛ࡟আͯ͠΋4UBUFGVM4FUͱ1PE͕ফ͑ΔͷΈ  17$ 17͸࡟আ͞Εͳ͍ Φϖϛε๷ࢭ 38 /PEF 38 /PEF ɾɾ NZTRM NZTRM

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1FSTJTUFOU7PMVNFͷׂΓ౰ͯ ‣ 1FSTJTUFOU7PMVNFͷׂΓ౰ͯʹ͸େ͖ͭ͘ͷํ๏ ‣ .BOVBM1SPWJTJPOJOH ؅ཧऀ͕4UPSBHF$MBTTͱ1FSTJTUFOU7PMVNFΛࣄલʹσϓϩΠ Ϣʔβ͸1FSTJTUFOU7PMVNF$MBJNΛ࢖ͬͯ1FSTJTUFOU7PMVNFΛબ୒ ‣ %ZOBNJD1SPWJTJPOJOH ؅ཧऀ͸4UPSBHF$MBTTͷΈࣄલʹ४උ Ϣʔβ͕1FSTJTUFOU7PMVNF$MBJNΛσϓϩΠ͢Δͱ  1FSTJTUFOU7PMVNF͕ࣗಈੜ੒ 22

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%ZOBNJD1SPWJTJPOJOH 23 ʜ TQFD DPOUBJOFST OBNFNZTRM JNBHFNZTRM ʜ WPMVNF.PVOUT OBNFNZTRMEBUB NPVOU1BUIWBSMJCNZTRM WPMVNF$MBJN5FNQMBUFT NFUBEBUB OBNFNZTRMEBUB TQFD BDDFTT.PEFT<3FBE8SJUF0ODF> TUPSBHF$MBTT/BNFHPME SFTPVSDFT SFRVFTUT TUPSBHF(J %FQMPZ

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%ZOBNJD1SPWJTJPOJOH 24 ʜ TQFD DPOUBJOFST OBNFNZTRM JNBHFNZTRM ʜ WPMVNF.PVOUT OBNFNZTRMEBUB NPVOU1BUIWBSMJCNZTRM WPMVNF$MBJN5FNQMBUFT NFUBEBUB OBNFNZTRMEBUB TQFD BDDFTT.PEFT<3FBE8SJUF0ODF> TUPSBHF$MBTT/BNFHPME SFTPVSDFT SFRVFTUT TUPSBHF(J $SFBUF17$

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%ZOBNJD1SPWJTJPOJOH 25 ʜ TQFD DPOUBJOFST OBNFNZTRM JNBHFNZTRM ʜ WPMVNF.PVOUT OBNFNZTRMEBUB NPVOU1BUIWBSMJCNZTRM WPMVNF$MBJN5FNQMBUFT NFUBEBUB OBNFNZTRMEBUB TQFD BDDFTT.PEFT<3FBE8SJUF0ODF> TUPSBHF$MBTT/BNFHPME SFTPVSDFT SFRVFTUT TUPSBHF(J 4FMFDU4$

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%ZOBNJD1SPWJTJPOJOH 26 ʜ TQFD DPOUBJOFST OBNFNZTRM JNBHFNZTRM ʜ WPMVNF.PVOUT OBNFNZTRMEBUB NPVOU1BUIWBSMJCNZTRM WPMVNF$MBJN5FNQMBUFT NFUBEBUB OBNFNZTRMEBUB TQFD BDDFTT.PEFT<3FBE8SJUF0ODF> TUPSBHF$MBTT/BNFHPME SFTPVSDFT SFRVFTUT TUPSBHF(J Storage $SFBUF7PMVNF QSPWJTJPOFS

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%ZOBNJD1SPWJTJPOJOH 27 ʜ TQFD DPOUBJOFST OBNFNZTRM JNBHFNZTRM ʜ WPMVNF.PVOUT OBNFNZTRMEBUB NPVOU1BUIWBSMJCNZTRM WPMVNF$MBJN5FNQMBUFT NFUBEBUB OBNFNZTRMEBUB TQFD BDDFTT.PEFT<3FBE8SJUF0ODF> TUPSBHF$MBTT/BNFHPME SFTPVSDFT SFRVFTUT TUPSBHF(J Storage OS "TTJHO $SFBUF  17

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%ZOBNJD1SPWJTJPOJOH 28 ʜ TQFD DPOUBJOFST OBNFNZTRM JNBHFNZTRM ʜ WPMVNF.PVOUT OBNFNZTRMEBUB NPVOU1BUIWBSMJCNZTRM WPMVNF$MBJN5FNQMBUFT NFUBEBUB OBNFNZTRMEBUB TQFD BDDFTT.PEFT<3FBE8SJUF0ODF> TUPSBHF$MBTT/BNFHPME SFTPVSDFT SFRVFTUT TUPSBHF(J Storage OS Container Runtime Container .PVOU  ɹ17

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3PMMJOH6QEBUF 29 ‣ ϩʔϦϯάΞοϓσʔτʹΑΓ1PE͸࠶࡞੒ ‣ 1FSTJTUFOU7PMVNFͱ1FSTJTUFOU7PMVNF$MBJN͸࠶࡞੒͞Εͳ͍ ‣ ͭ·ΓɺετϨʔδ૷ஔͷ7PMVNF΋࡟আ͞Εͳ͍ ‣ 7PMVNFʹର͠EFUBDIBUUBDI͕࣮ߦ ‣ /PEFো֐΍ηϧϑώʔϦϯάʹΑΔ1PEͷ࡞Γ௚͠ͷέʔεͰ΋ಉ༷

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W /PEF" 7PMVNF W /PEF# 7PMVNF /PEF$ 3PMMJOH6QEBUF

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W /PEF" 7PMVNF W /PEF# 7PMVNF /PEF$ 3PMMJOH6QEBUF W %FUBDI

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W /PEF" 7PMVNF W /PEF# 7PMVNF /PEF$ 3PMMJOH6QEBUF "UUBDI

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W /PEF" 7PMVNF /PEF# %FUBDI 7PMVNF /PEF$ W 3PMMJOH6QEBUF

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W /PEF" 7PMVNF /PEF# "UUBDI 7PMVNF /PEF$ W 3PMMJOH6QEBUF

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Ϛωʔδυ,4ͷετϨʔδ 35 (,& (PPHMF &,4 "NB[PO ",4 .4 ϒϩοΫ ϑΝΠϧ ϒϩοΫ ϑΝΠϧ ϒϩοΫ ϑΝΠϧ 7PMVNF ($&1FSTJTUFOU%JTL $MPVE'JMFTUPSB "NB[PO "NB[PO&'4 "[VSF%JTL "[VSF'JMF "DDFTT  .PEF 380 309 380 309 389 380 309 380 309 389 380 380  309 389 ಛ௃ w 44%PS)%%ͷ  બ୒Մ w ϦʔδϣϯӬଓ  σΟεΫ ϕʔλ w /'4W w *OUSFFͷ/'4 ͔Β࢖༻ w൚༻44% HQ ɺ  ߴੑ44% JP ɺ ൚༻)%% TU ɺ  $PME)%% TD ͷબ୒Մ w/'4W w$4*͔Β࢖༻ w 44%PS)%% ͷબ୒Մ w4.# w*OUSFF$4*͔Β ࢖༻ w"[VSF'JMFͱ "[VSF/FU"QQ 'JMFͷબ୒Մ .BY  17/PEF

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(,&Ͱ1FSTJTUFOU7PMVNFΛ࢖͏ ‣ (,&Ͱ,VCFSOFUFTΫϥελΛηοτΞοϓ σϑΥϧτͰϒϩοΫετϨʔδͷ4UPSBHF$MBTT lTUBOEBSEz ͕  σϓϩΠࡁΈ σϑΥϧτͷσΟεΫλΠϓ͸QETUBOEBSE )%% มߋ͍ͨ͠৔߹͸4UPSBHF$MBTTΛฤूPS৽ͨʹσϓϩΠ 36 LVCFDUMHFUTD /".&1307*4*0/&3"(& TUBOEBSE EFGBVMU LVCFSOFUFTJPHDFQENT

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(,&Ͱ1FSTJTUFOU7PMVNFΛ࢖͏ ‣ 17$ͷ.BOJGFTUΛ࡞੒σϓϩΠ 37 BQJ7FSTJPOW LJOE1FSTJTUFOU7PMVNF$MBJN NFUBEBUB OBNFUFTUWPM TQFD TUPSBHF$MBTT/BNFTUBOEBSE BDDFTT.PEFT 3FBE8SJUF0ODF SFTPVSDFT SFRVFTUT TUPSBHF(J LVCFDUMBQQMZGQWDZBNM QFSTJTUFOUWPMVNFDMBJNUFTUWPMDSFBUFE QWDZBNM

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(,&Ͱ1FSTJTUFOU7PMVNFΛ࢖͏ ‣ 17$ 17Λ֬ೝ 38 LVCFDUMHFUQWD /".&45"56470-6.&$"1"$*5:"$$&44.0%&44503"(&$-"44"(& UFTUWPM#PVOEQWDYYYGD(J380TUBOEBSET LVCFDUMHFUQW /".&$"1"$*5:"$$&44.0%&43&$-"*.10-*$:45"564$-"*.4503"(&$-"443&"40/"(& QWDYYYGD(J380%FMFUF#PVOEEFGBVMUUFTUWPMTUBOEBSET

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(,&Ͱ1FSTJTUFOU7PMVNFΛ࢖͏ ‣ 17$Λࢦఆͨ͠1PEͷ.BOJGFTUΛ  ࡞੒ˍσϓϩΠ 39 BQJ7FSTJPOW LJOE1PE NFUBEBUB OBNFUFTUQPE TQFD DPOUBJOFST JNBHFOHJOY OBNFUFTUQPE WPMVNF.PVOUT NPVOU1BUIVTSTIBSFOHJOYIUNM OBNFEBUBWPM WPMVNFT OBNFEBUBWPM QFSTJTUFOU7PMVNF$MBJN DMBJN/BNFUFTUWPM LVCFDUMBQQMZGQPEZBNM QPEUFTUQPEDSFBUFE QPEZBNM ‣ Ϛ΢ϯτ͞Ε͍ͯΔ͔Λ֬ೝ LVCFDUMFYFDUFTUQPEEGcHSFQOHJOY EFWTECVTSTIBSFOHJOYIUNM

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Α͋͘Δ࣭໰ͱͦͷճ౴

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ετϨʔδ͸ԿΛબΜͩΒྑ͍ʁ ‣ ࣍ͷج४Λߟ͑બผ͢Δͷ͕Φεεϝ ‣ ֨ೲ͍ͨ͠σʔλͷՁ஋͸ʁ ‣ ར༻͢ΔΞϓϦέʔγϣϯͷछྨ͸ʁ ‣ 044ͷετϨʔδͷ৔߹ɺো֐ൃੜ࣌ʹιʔεͷϝϯς͕ԿਓͰ͖Δ͔ʁ ‣ 044ͷετϨʔδͷ৔߹ɺো֐ൃੜ࣌ʹอূͯ͘͠Εͳ͍ͷͰ࠷ѱσʔλ͕ফ ͑Δ͜ͱ΋ࢹ໺ʹೖΕͯར༻ϢʔεέʔεΛݟఆΊ ‣ ετϨʔδΛબͿ࣌ɾγεςϜઃܭ͢Δͱ͖ʹߟྀ͢΂͖ϙΠϯτ͸ʁ ࣦഊ͠ͳ͍,VCFSOFUFT޲͚ετϨʔδબͼͭͷϙΠϯτ $/%5   IUUQTTQFBLFSEFDLDPNZTBLBTIJUBTIJCBJTJOBJLVCFSOFUFTYJBOHLFTVUPSF[JYVBOCJUVGBMTFQPJOUP

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$JOEFSͱ"ࣾͲͪΒ͕ྑ͍ʁ ‣ Α͘ฉ͔Ε·͕͢ɺൺֱର৅͕ҧ͏ͷͰ౴͑ΒΕ·ͤΜ ‣ ,VCFSOFUFT΍$4*Λαϙʔτ͍ͯ͠ͳ͍ετϨʔδΛ࢖͏৔߹͸  0QFO4UBDL$JOEFSΛ1SPYZͱͯ͠ར༻ 42 $4* $JOEFS /PEF J4$4* ίϯτϩʔϧϓϨʔϯ σʔλϓϨʔϯ "ࣾετϨʔδ $4* /PEF J4$4*/'4FUD "ࣾετϨʔδ 74

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