Persistent Volumeのはじめの一歩

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1FSTJTUFOU7PMVNFͷ ͸͡ΊͷҰา :VLJOPSJ4BLBTIJUB

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ࣗݾ঺հ ‣ٕज़ݚڀΤϦΞ ӡ༻؅ཧٕज़ Ϋϥ΢υ αʔόετϨʔδ ࣗಈࣗ཯ίϯϐϡʔςΟϯά "*.- // ).. #BZFTJBO/FUXPSL ‣৬ྺ ೔ཱ੡࡞ॴ 㾎தԝݚڀॴԣ඿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 σʔλͷӬଓԽ ,VCFSOFUFTʹ͓͚ΔετϨʔδϞσϧͱಈ͖ 17$17Λศར͔ͭ҆શʹ࢖͏4UBUFGVM4FU 3

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σʔλͷӬଓԽ

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1FSTJTUFOUͱ͸ ‣ &QIFNFSBM ͸͔ͳ͍ɺ୹໋ 1PEͷ࡟আ࠶σϓϩΠͱಉ࣌ʹσʔλ͕ফ͑Δ FNQUZ%JS XSJUBCMFMBZFSTFUD ‣ 1FSTJTUFOU ࣋ଓతɺӬଓੑ 1PE͕࡟আ࠶σϓϩΠ͞Εͯ΋σʔλ͸ফ͑ͳ͍ 1FSTJTUFOU7PMVNF 17 5 bin/lib Container App Logic Data

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&QIFNFSBM 1FSTJTUFOU -PDBM 1FSTJTUFOU &YUFSOBM σʔλͷอଘ৔ॴ ଱ো֐ੑ 1PE࡟আͰσʔλ΋࡟আ ϊʔυ ΋͘͠͸σΟεΫ ࡟আͰ σʔλ΋࡟আ ετϨʔδ ΋͘͠͸7PMVNF ࡟আ Ͱσʔλ΋࡟আ ୅දతͳ ,4ͷϦιʔε FNQUZ%JS 17$17 -PDBM IPTU1BUI 17$17 σʔλͷอଘ৔ॴ $POUBJOFS 4UPSBHF $POUBJOFS $POUBJOFS $POUBJOFS PS XSJUBCMF MBZFS FNQUZ%JS

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#MPDL4UPSBHF 'JMF4UPSBHF 0CKFDU4UPSBHF ΞʔΩςΫνϟ ಛ௃ w಺ଂυϥΠϒͱಉ͡3BXσόΠε wϑΝΠϧγεςϜ͸ࣗ༝ʹબ୒ wωοτϫʔΫυϥΠϒ wϑΝΠϧγεςϜ͸ετϨʔδ೚ ͤɺมߋෆՄ wΦϒδΣΫτ୯ҐͰΞΫηε wϑΝΠϧγεςϜʹґଘ͠ͳ͍ ͨΊɺେྔσʔλΛ֨ೲՄೳ σʔλసૹϓϩτίϧ J4$4* /7.FP' /'4 4.# )5514 )551 Ϛ΢ϯτύεͷྫ EFWTEB aaaTIBSFaIPHF IUUQTBBBPSHTUPSBHFIPHF ੑೳ )JHI .JEEMF -PX ओͳ༻్ %# 04 #PPU%JTL ϑΝΠϧͷڞ༗ ࣸਅɺಈը֨ೲ ετϨʔδछผ J4$4* /"44FSWFS /'4 4.# ,74 )55144FSWFS )5514 )PTU )PTU )PTU Ұൠతͳ܏޲Ͱ͋Γ੡඼ʹΑΓมΘΓ·͢ 4$4* 4$4*

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σʔλՁ஋ͱಛੑͱอଘ৔ॴ ‣ σʔλͷՁ஋΍ΞϓϦͷಛੑʹԠͯ͡ɺͲ͜ʹอଘ͢Δͷ͔ΛܾΊΔͷ͕ϕλʔ Ձ஋͸Ϗδωε΍ఏڙαʔϏεͷॏཁ౓Ͱܾ·Δ͜ͱ͕ଟ͍ ಛੑ͸σʔλʹΞΫηε͢ΔΞϓϦ΍ϢʔεέʔεͰܾ·Δ͜ͱ͕ଟ͍ ཁٻੑೳ 3FBE8SJUFͷൺ཰ 3%#͸/'4͕ඇਪ঑͕ଟ͍౳ 3%# .2 /P42- 'JMF ސ٬৘ใ ։ൃɾ ӡ༻ʹඞཁ ࠶ੜ੒Մೳͳσʔλ Ұ࣌తͳσʔλ &QIFNFSBM 1FSTJTUFOU -PDBM 1FSTJTUFOU #ࣾ'JMF Ձ஋ ಛੑ อଘ৔ॴ 1FSTJTUFOU "ࣾ#MPDL 1FSTJTUFOU $ࣾ0CKFDU

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ΞϓϥΠΞϯεͱ4%4 ‣ ΞϓϥΠΞϯεετϨʔδͱ4%4͸ΞʔΩ্ੑೳಛੑ͕ҧ͏ ‣ ετϨʔδ͸%JTL*0ʹؔͯ͠͸ͲͪΒ΋෼ࢄΞʔΩςΫνϟ ‣ 4%4͸εϞʔϧελʔτ͕༰қɻͨͩ͠ɺେن໛Խʹ൐͍ωοτϫʔΫ͕ϘτϧωοΫʹͳΓқ͍ ‣ σʔλͷՁ஋ɾಛੑʹԠͯ͡બ୒͢΂͖ ෼ࢄΞϓϦ͕4%4ʹ޲͍͍ͯΔͱ͍͏୯७ͳΘ͚Ͱ͸ແ͍ $POUSPMMFS $IBTTJT .FNPSZ %BUB /PEF .FNPSZ %BUB /PEF .FNPSZ %BUB /PEF .FNPSZ %BUB /PEF .FNPSZ %BUB /PEF .FNPSZ .FUB%BUB /PEF .FNPSZ %# )PTU )PTU " " " "` "`` " ΞϓϥΠΞϯε ετϨʔδ 4%4 " " " "

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,VCFSOFUFTʹ͓͚Δ ετϨʔδϞσϧͱಈ͖

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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 %FQSFDBUFE 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࢓༷ ‣ ओཁͳίϯςφΦʔέετϨʔγϣϯ͕࠾༻ ,VCFSOFUFT $MPVE'PVOESZ .FTPT %PDLFS FUD ‣ ,VCFSOFUFTͰ͸ʹͯ("αϙʔτ ‣ ,VCFSOFUFTͷιʔεπϦʔ JOUSFF Ͱ؅ཧ͞Ε͍ͯͨετϨʔδ૷ஔʹ ؔ࿈͢Δ࣮૷͕ɺSEϕϯμͰಠࣗʹ։ൃఏڙ͢Δ͜ͱ͕Մೳ ‣ ,VCFSOFUFTͰ͸JOUSFF͸ഇࢭ༧ఆɺ$4*΁ͷҠߦ͕ਪਐத 20

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1FSTJTUFOU7PMVNFͷׂΓ౰ͯ ‣ 1FSTJTUFOU7PMVNFͷׂΓ౰ͯʹ͸େ͖ͭ͘ͷํ๏ ‣ .BOVBM1SPWJTJPOJOH ؅ཧऀ͕4UPSBHF$MBTTͱ1FSTJTUFOU7PMVNFΛࣄલʹ࡞੒ Ϣʔβ͸1FSTJTUFOU7PMVNF$MBJNΛ࢖ͬͯ1FSTJTUFOU7PMVNFΛબ୒ ‣ %ZOBNJD1SPWJTJPOJOH ؅ཧऀ͸4UPSBHF$MBTTͷΈࣄલʹ४උ Ϣʔβ͕1FSTJTUFOU7PMVNF$MBJNΛ࡞੒͢Δͱ 1FSTJTUFOU7PMVNF͕ࣗಈੜ੒ 21

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%ZOBNJD1SPWJTJPOJOH 22 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 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 $SFBUF17$

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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 4FMFDU4$

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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 Storage $SFBUF7PMVNF QSPWJTJPOFS $4*DPOUSPMMFSͷಈ͖͸ׂѪ

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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 OS "TTJHO $SFBUF 17

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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 Container Runtime Container .PVOU ɹ17

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3PMMJOH6QEBUF 28 ‣ 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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17$17Λศར͔ͭ ҆શʹ࢖͏4UBUFGVM4FU

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4UBUFGVM4FU TUT 35 ‣ 17$17Λศར͔ͭ҆શʹ࢖͏ͳΒ4UBUFGVM4FU͕Φεεϝ ‣ 4UBUFGVM4FUΛ࡟আͯ͠΋4UBUFGVM4FUͱ1PE͕ফ͑ΔͷΈ 17$ 17͸࡟আ͞Εͳ͍ Φϖϛε๷ࢭ ‣ ಛ௃ 1PE໊ʹ࿈ଓͨ͠φϯόϦϯά FH NZTRM NZTRMʜ ετϨʔδʹ༏͍͠ಈ࡞ ҆શ 17$Λࣗಈੜ੒ͯ͘͠ΕΔWPMVNF$MBJN5FNQMBUFT ‣ 17$17ͷαΠζ֦ு 7PMVNF&YQBOTJPO Ͱ͸஫ҙ͕ඞཁ˞ ɾɾ ˞$/%5l1FSTJTUFOU7PMVNFͷҰาਐΜͩ࢖͍ํzࢀর IUUQTTQFBLFSEFDLDPNZTBLBTIJUBQFSTJTUFOUWPMVNFGBMTFCVKJOOEBTIJJGBOH

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ಛ௃࿈ଓͨ͠φϯόϦϯά ‣ 4UBUFGVM4FU͔Βੜ੒͞ΕΔ1PEͷ໊લ͸ࣗಈͰφϯόϦϯά ‣ 1PEʹ໾ׂΛઃఆ͠қ͍ εΫϦϓτͳͲͰศར 36 LVCFDUMHFUQPE NAME READY STATUS RESTARTS AGE mysql-0 2/2 Running 0 69s mysql-1 2/2 Running 0 59s mysql-2 2/2 Running 0 52s NZTRM NZTRM NZTRM 4PVSDF 3FQMJDB 3FQMJDB

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ಛ௃ετϨʔδʹ༏͍͠ಈ࡞ ‣ 1PEΛߋ৽͢Δࡍɺඞͣલͷ൪߸ͷ1PEͷॲཧ͕׬͔ྃͯ͠Β࣮ߦ ‣ ετϨʔδͷ%FUBDI͕ߦΘΕͨޙɺ"UUBDI͕࣮ߦ͞ΕΔ͜ͱ͕อূ ‣ %FQMPZNFOUͩͱ"UUBDIʹࣦഊɺσʔλഁյʹܨ͕Δ৔߹͕͋ΔͷͰ஫ҙ 3PMMJOH 6QEBUF FUD 3VOOJOH 5FSNJOBUJOH $SFBUJOH ಉ࣌ʹൃੜ 38 Ϛ΢ϯτʹࣦഊ΍ ಉҰϑΝΠϧ΁ͷ8SJUF ͕ൃੜ͢ΔϦεΫ͋Γ 3PMMJOH 6QEBUF FUD 3VOOJOH $SFBUJOH ݹ͍1PE͕࡟আޙɺ࡞੒։࢝ 38 QPEYYY QPEYYY QPEZZZ QPE QPE QPE %FQMPZNFOU 4UBUFGVM4FU

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ઃఆ಺༰͸ 17$ͱಉ͡ ಛ௃WPMVNF$MBJN5FNQMBUFT ‣ 4UBUFGVM4FUΛσϓϩΠ͢Δͱ1PEͷੜ੒ʹ͋Θͤͯ17$΋ੜ੒ 38 apiVersion: apps/v1 kind: StatefulSet metadata: name: mysql … containers: … volumeMounts: - name: data mountPath: /var/lib/mysql … volumeClaimTemplates: - metadata: name: data spec: storageClassName: standard accessModes: [“ReadWriteOnce”]  resources: requests: storage: 10Gi LVCFDUMHFUQPE NAME READY STATUS RESTARTS AGE mysql-0 2/2 Running 0 156m mysql-1 2/2 Running 0 156m mysql-2 2/2 Running 0 156m LVCFDUMHFUQWD NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE data-mysql-0 Bound pvc-XXX 10Gi RWO standard 164m data-mysql-1 Bound pvc-YYY 10Gi RWO standard 163m data-mysql-2 Bound pvc-ZZZ 10Gi RWO standard 161m LVCFDUMHFUQW NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE pvc-xxx 10Gi RWO Delete Bound db/data-mysql-1 standard 165m pvc-yyy 10Gi RWO Delete Bound db/data-mysql-2 standard 163m pvc-zzz 10Gi RWO Delete Bound db/data-mysql-0 standard 166m 17͸17$͕ੜ੒͞ΕΔͱ %ZOBNJD1SPWJTJPOJOH ʹΑΓࣗಈੜ੒ WPMVNF$MBJN5FNQMBUFͷ໊લ 4UBUFGVM4FUͷ໊લ࿈൪ Ͱ17$͕ੜ੒

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·ͱΊ 39 ‣ σʔλͷӬଓԽʹؔ͢Δجຊతͳߟ͑ํΛ঺հ ‣ ,VCFSOFUFTͰͷετϨʔδͷϞσϧͱಈ͖Λ঺հ ‣ 17$17Λศར͔ͭ҆શʹ࢖͏4UBUFGVM4FUʹ͍ͭͯ঺հ ‣ ,VCFSOFUFTͰ͸ɺந৅Խ͞ΕͨϞσϧʹΑΓ ετϨʔδΛར༻͢Δͷ͸γϯϓϧͰ؆୯ ‣ ΋͠೉͍͠ͱ͢Ε͹ɺͦ΋ͦ΋ͷεςʔτϑϧΞϓϦ΍ετϨʔδͷӡ༻ εςʔτϑϧΞϓϦ΍ετϨʔδͷӡ༻ܦݧ͕ઙ͍৔߹͸ɺ ॳΊ͔ΒϏδωεΫϦςΟΧϧͳσʔλʹ௅ઓͤͣɺ ࣦͬͯ΋ϏδωεʹӨڹͷগͳ͍σʔλ͔Β௅ઓ͠ϊ΢ϋ΢Λ஝ੵ ͜Ε͔Βεςʔτϑϧ΁௅ઓ͢Δਓ΁ͷҰݴ