2時間で分かる！Kubernetesとは何なのか / what-is-kubernetes

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ࣌ؒͰ෼͔Δʂ ͍·࿩୊ͷ ʮ,VCFSOFUFTʯͱ͸ Կͳͷ͔ ג ΧαϨΞϧଟాਅහ ೥݄೔

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ͜ͷηογϣϯͷ໨త ▸ ΞϓϦέʔγϣϯ։ൃऀ໨ઢͰ஌͓ͬͯ͘΂͖ ,VCFSOFUFTͷ஌ࣝͱ࢓૊ΈΛͬ͘͟Γ௫Ή ▸ %PDLFSͳͲίϯςφͷ஌ࣝ΍ɺ ,VCFSOFUFTࣗମͷ؅ཧɾӡ༻ͳͲ͸είʔϓ֎
▸ αϯϓϧίʔυ ▸ IUUQTHJUIVCDPN.BTBUPTIJ5BEBLT KKVHDDDTQSJOH

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ࣗݾ঺հ ▸ ଟాਅහʢ!TVLF@NBTBʣ ▸ ݚमτϨʔφʔ!ΧαϨΞϧ ▸ 4QSJOH+BWB&&.JDSPTFSWJDFT
$MPVE'PVOESZ,VCFSOFUFT ▸ 1JWPUBMೝఆߨࢣ ▸ ೔ຊ4QSJOHϢʔβձελοϑ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ࣗݾ঺հʢଓ͖ʣ ▸ ೥݄ɺ$,"%औಘ ▸ $MPVE/BUJWF$PNQVUJOH'PVOEBUJPO $/$'
ʹΑΔ,VCFSOFUFTͷ։ൃऀ޲͚ࢿ֨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE גࣜձࣾΧαϨΞϧ ▸ ଞࣾʹ͸ແ͍৭ʑͳϓϩάϥϛϯάݴޠͷ ݚमΛఏڙ͍ͯ͠·͢ʂ /&8

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ΦϯϥΠϯݚमɺ͸͡Ί·ͨ͠ ߨࢣ डߨऀ༷ ▸ ʮֶशޮՌ͸௨ৗͱมΘΒͳ͍ʯ ͱ޷ධͰ͢ʂ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTݚम ΞϓϦέʔγϣϯΤϯδχΞͷͨΊͷ ,VCFSOFUFTجૅ Ϋϥ΢υωΠςΟϒͳΞϓϦέʔγϣϯͷߏஙͱӡ༻ ೔ؒ ▸
ຊ೔ͷ಺༰͸ݚमͷҰ෦ΛਂງΓͨ͠΋ͷͰ͢ ▸ ݚम಺Ͱ͸ɺຊ೔͸ѻΘͳ͍෯޿͍ػೳΛ ϋϯζΦϯ෇͖ͰֶशͰ͖·͢ʂ ▸ ΋ͪΖΜΦϯϥΠϯ࣮ࢪରԠʂ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ໨࣍ ▸ ,VCFSOFUFT͸ԿΛ͢Δ΋ͷ͔ ▸ ,VCFSOFUFTͷΞʔΩςΫνϟ ▸ ίϯςφ؅ཧʢ%FQMPZNFOUɺ3FQMJDB4FUɺ1PEʣ
▸ Ϋϥελʔ಺Ͱͷ௨৴ʢ4FSWJDFʣ ▸ Ϋϥελʔ֎ͱͷ௨৴ʢ*OHSFTTʣ ▸ ,VCFSOFUFTΛ࢖͏લʹߟ͑Δ΂͖͜ͱ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͱ͸ ▸ ଟ਺ͷίϯςφΛ؅ཧ͢Δ ίϯςφΦʔέετϨʔγϣϯγεςϜ ▸ ίϯςφͷ഑ஔɾ؂ࢹɾࣗಈ෮چͳͲ ▸
$MPVE/BUJWF$PNQVUJOH'PVOEBUJPO $/$' ؅ཧԼͰ044ͱͯ͠։ൃ ▸ ༷ʑͳΫϥ΢υϕϯμʔ͕αϙʔτ͍ͯ͠Δ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ؾʹͳΔಡΈํ ▸ ೔ຊޠͩͱʮΫʔόʔωςεʯͱݴ͏ਓ͕ଟ͍ ▸ ӳޠͩͱʮΫʔόωςΟεʯͱݴ͏ਓ͕ଟ͍

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LTʁ ,VCFSOFUFT จࣈ ▸ ಡΈํ͸ਓͦΕͧΕ ▸
έΠπɺέʔΤΠτΤεɺέʔϋνΤεɺʜ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ίϯςφΦʔέετϨʔγϣϯγεςϜͱ͸ ▸ ΦʔέετϥͷࢦشऀͷΑ͏ʹɺ ଟ਺ͷίϯςφ ԋ૗ऀ Λ؅ཧ͢ΔγεςϜ ▸
,VCFSOFUFTҎ֎ʹ΋৭ʑ͋Δ͕ɺ ݱࡏ͸࣮࣭,VCFSOFUFTҰڧ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTΛ࢖͏ʹ͸ ▸ ύϒϦοΫΫϥ΢υ ▸ "NB[PO&MBTUJD $POUBJOFS4FSWJDF GPS,VCFSOFUFT
&,4 ▸ "[VSF,VCFSOFUFT 4FSWJDF ",4 ▸ (PPHMF,VCFSOFUFT &OHJOF (,& ▸ ΦϯϓϨ ▸ LVCFBEN ▸ 7.XBSF5BO[V,VCFSOFUFT (SJE*OUFHSBUFE&EJUJPO ▸ 3FE)BU0QFO4IJGU ▸ ϩʔΧϧ1$ ▸ %PDLFS ▸ .JOJLVCF

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE <౾஌ࣝ>,VCFSOFUFTͷىݯ#PSH ▸ (PPHMF͕ࣾίϯςφͱͯ͠ಈ͔͍ͯ͠Δ ࣗࣾαʔϏεΛ؅ཧ͢ΔγεςϜ ▸ ಺෦γεςϜͳͷͰ044Ͱ͸ͳ͍ ▸
(PPHMFʹΑΓ࿦จ΋ެ։͞Ε͍ͯΔ ▸ ݪจIUUQTSFTFBSDIHPPHMFQVCTQVC ▸ ೔ຊޠ༁IUUQTCMPHJOEVDUPSNFFOUSZ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͷόʔδϣϯϙϦγʔ ▸ ໿ϲ݄ʹճɺϚΠφʔόʔδϣϯϦϦʔε ▸ 044Ͱͷαϙʔτର৅ʢόάϑΟοΫε౳ʣ͸ ௚ۙͭͷϚΠφʔόʔδϣϯ ▸
ྫɿ͕ϦϦʔε͞ΕͨΒɺ ɹɹαϙʔτର৅͸YɺYɺY ▸ ৽͍͠ϝδϟʔϦϦʔε༧ఆʢYYʣ͸ ࠓͷͱ͜Ζແ͠

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ओͳ,VCFSOFUFT͕΍Δ͜ͱ ᶃ Πϯϑϥͷந৅Խ ᶄ ϦιʔεʹԠͨ͡ ίϯςφ഑ஔ ᶅ
ηϧϑώʔϦϯά ᶆ ΦʔτεέʔϦϯά ᶇ ϩʔϦϯά Ξοϓσʔτ ᶈ αʔϏε σΟεΧόϦ ˍෛՙ෼ࢄ ᶉ ઃఆ஋ͷ؅ཧ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶃΠϯϑϥͷந৅Խ ▸ ͲͷΑ͏ͳΠϯϑϥͰ΋ɺ ։ൃऀଆ͔Β͸ಉ͡Α͏ʹ࢖͏͜ͱ͕Ͱ͖Δ ෺ཧ αʔόʔ
W4QIFSF "84 "[VSF ($1 ,VCFSOFUFT

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶄϦιʔεʹԠͨ͡ίϯςφ഑ஔ ▸ ֤8PSLFS/PEFʢ7.౳ʣͷ Ϧιʔεঢ়گΛؑΈͯɺ ৽نίϯςφͷ഑ஔΛܾΊΔ ▸ $16࢖༻཰ɺϝϞϦ࢖༻ྔ
ͳͲͰ൑அ ίϯςφ ίϯςφ ίϯςφ ίϯςφ ίϯςφ ίϯςφ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶅηϧϑώʔϦϯά ▸ ཧ૝ͷঢ়ଶͱݱࡏͷঢ়ଶΛൺֱͯ͠ɺ ζϨ͕͋ͬͨΒཧ૝ͷঢ়ଶʹ໭͢ ίϯςφ ᶃʮίϯςφ୆͕
ɹཧ૝ʯͱࢦఆ ᶄίϯςφ୆ ɹΛ഑ஔ ίϯςφ ίϯςφ ᶅ8PSLFS/PEFʹো֐ൃੜ ᶆζϨΛݕ஌ ɹˠ৽نʹ୆഑ஔ ৽͍͠ ίϯςφ ✨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶆΦʔτεέʔϦϯά ▸ ෛՙঢ়گʢओʹ$16࢖༻཰ʣ ʹΑͬͯɺίϯςφͷ୆਺Λ ࣗಈతʹ૿ݮͤ͞Δ ▸ ୆਺ͷ্ݶɾԼݶɺ
$16࢖༻཰ͷᮢ஋ͳͲ͸ ઃఆՄೳ ▸ )PSJ[POUBM1PE"VUPTDBMFS ͷ࡞੒͕ඞཁ ίϯςφ ίϯςφ ίϯςφ ৽͍͠ ίϯςφ ✨ ৽͍͠ ίϯςφ ✨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶇϩʔϦϯάΞοϓσʔτ ▸ ίϯςφͷόʔδϣϯ ΞοϓΛগͣͭ͠ߦ͏ ͜ͱͰɺμ΢ϯλΠϜ ΛθϩʹͰ͖Δ ▸
Ұ౓ʹγϟοτμ΢ϯ ͢Δ୆਺ͳͲ͸ઃఆՄ ೳ v1.0 v1.0 v1.0 v1.1 ✨ v1.0 v1.0 v1.1 ✨ v1.1 v1.1 v1.0 v1.1 ✨ v1.1

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶈαʔϏεσΟεΧόϦˍෛՙ෼ࢄ ▸ ͋Δίϯςφ͔Βผͷίϯςφʹɺ *1ΞυϨεͰ͸ͳ໊͘લͰΞΫηεͰ͖Δ ui api
api api api- service http://api-service ෛՙ෼ࢄ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ᶉઃఆ஋ͷ؅ཧ ▸ $POpH.BQ͓Αͼ4FDSFU ▸ %#ͷ63-ɾϢʔβʔ໊ɾύεϫʔυͳͲͷઃఆ৘ใ Λ؅ཧ͢Δ ▸
ઃఆ஋͸ɺ֤ίϯςφʹ؀ڥม਺ͳͲͱͯ͠౉͢͜ͱ ͕Ͱ͖Δ ▸ ຊηογϣϯͰ͸ൣғ֎

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFT͕΍Βͳ͍͜ͱ ▸ ίϯςφҎ֎ͷࣗಈ෮چʢ7.΍ϓϩηεͳͲʣ ▸ ΞϓϦέʔγϣϯίʔυͷ؅ཧ΍Ϗϧυ ▸ ϩΪϯάɺϞχλϦϯάɺΞϥʔτ
▸ ϛυϧ΢ΣΞͷఏڙ ▸ ίϯςφΠϝʔδͷ؅ཧ ,VCFSOFUFT͕ ΍Βͳ͍͜ͱ ʹΘΕΘΕਓ͕ؒ ΍Δ΂͖͜ͱ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ຊষͷ·ͱΊ ▸ ,VCFSOFUFT͸ίϯςφΦʔέετϨʔγϣϯ γεςϜ ▸ ,VCFSOFUFT͕΍Δ͜ͱɾ΍Βͳ͍͜ͱΛ ͔ͬ͠Γ೺Ѳ͠Α͏

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ίϯςφͱ1PE ▸ 1PE͸ɺͭҎ্ͷίϯςφΛ ࣋ͭ ▸ ଟ͘ͷέʔεͰ͸ίϯςφͷΈ ▸
αΠυΧʔͱݺ͹ΕΔͭ໨ͷ ίϯςφΛؚΉ͜ͱ΋͋Δ ▸ ,VCFSOFUFT͸ɺ 1PEΛ࠷খ୯Ґͱͯ͠؅ཧ Pod ίϯςφ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE .BTUFS/PEFͱ8PSLFS/PEF ▸ .BTUFS/PEF ▸ ,VCFSOFUFTશମΛ؅ཧ͢Δ7.·ͨ͸෺ཧαʔόʔ ▸ ୯ʹʮ.BTUFSʯͱ΋ݺͿ
▸ 8PSLFS/PEF ▸ ࣮ࡍʹ1PEΛಈ͔͢7.·ͨ͸෺ཧαʔόʔ ▸ ୯ʹʮ/PEFʯͱ΋ݺͿ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͷશମ૾ kube-apiserver kube-controller -manager kube- scheduler
etcd .BTUFS/PEF 8PSLFS/PEFT ؅ཧऀPS ։ൃऀ kube- proxy kube let LVCFDUM ίϚϯυ ˞.BTUFS/PEF΋ෳ਺୆Ͱߏ੒Մೳ Pod

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMίϚϯυͱLVCFBQJTFSWFS ▸ ؅ཧऀPS։ൃऀ͸ ᶃ ʮཧ૝ͷঢ়ଶʯΛϚχϑΣετʢ:".-ʣʹهड़ ᶄ ϚχϑΣετΛLVCFDUMίϚϯυͰΞοϓϩʔυ
ʢ಺෦తʹ͸)551Λ࢖༻ʣ ▸ LVCFBQJTFSWFS͸ ᶅ ϚχϑΣετΛड৴ɾղੳ ᶆ ͦͷσʔλΛFUDEʹอଘ ྫɿ/HJOYͷ1PE͕୆ɺ ɹɹ.Z42-ͷ1PE͕୆ ಡΈํ͸ ʮΩϡʔϒίϯτϩʔϧʯ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMίϚϯυͱLVCFBQJTFSWFS kube-apiserver etcd Ϛχ ϑΣετ ᶃϚχϑΣετ
ɹΛ࡞੒ ᶄLVCFDUMͰ ɹΞοϓϩʔυ ɹ )551 ᶅϚχϑΣετΛ ɹड৴ɾղੳ ᶆղੳͨ͠ ɹσʔλΛ ɹอଘ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE FUDE ▸ ʮཧ૝ͷঢ়ଶʯͱ ʮݱࡏͷঢ়ଶʯ͕ อଘ͞Ε͍ͯΔ ▸ :".-Ͱอଘ͞Ε͍ͯ
Δͱղऍͯ͠΋0, ▸ LVCFBQJTFSWFS͔Β ͷΈΞΫηεՄೳ kube-apiserver etcd ཧ૝ /HJOY୆ .Z42-୆ ݱࡏ /HJOY୆ .Z42-୆

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFBQJTFSWFS ▸ ,VCFSOFUFTͷ৺ଁ෦ ▸ 3&45GVM8FCαʔϏε ▸ ଞͷίϯϙʔωϯτ͸ɺ
LVCFBQJTFSWFSΛ௨ͯ͡ FUDE΁ͷ$36%Λߦ͏ kube-apiserver etcd ཧ૝ /HJOY୆ .Z42-୆ ᶅϚχϑΣετΛ ɹड৴ɾղੳ ᶆղੳͨ͠ ɹσʔλΛอଘ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFTDIFEVMFS ▸ ఆظతʹLVCFBQJTFSWFSʹ ΞΫηεͯ͠ɺ ▸ 8PSLFS/PEF͕ະܾఆͷ 1PE͕ແ͍͔νΣοΫ
▸ ະܾఆͳ1PEͷ 8PSLFS/PEFΛܾఆͯ͠ FUDEʹॻ͖ࠐΉ kube-apiserver etcd kube-scheduler 1PE৘ใ ۭ ˠ/PEF

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDPOUSPMMFSNBOBHFS ▸ ෳ਺ͷ$POUSPMMFSΛ ؅ཧ͍ͯ͠Δ ▸ ۩ମྫ͸ޙड़ ▸
֤$POUSPMMFS͸ɺ ఆظతʹ LVCFBQJTFSWFSʹ ΞΫηεͯ͠FUDEʹ $36%Λߦ͍ͬͯΔ kube-apiserver etcd kube-controller-manager A Cont roller B Cont roller C Cont roller

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͷશମ૾ ࠶ܝ kube-apiserver kube-controller -manager kube-
scheduler etcd .BTUFS/PEF ؅ཧऀPS ։ൃऀ LVCFDUM ίϚϯυ ͜͜·Ͱ 8PSLFS/PEFT kube- proxy kube let Pod

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFQSPYZ ▸ 8PSLFS/PEFʹೖͬͯ͘Δ௨ ৴΍ग़͍ͯ͘௨৴͸ɺ શͯLVCFQSPYZΛܦ༝͢Δ ▸ αʔϏεσΟεΧόϦ
ˍෛՙ෼ࢄͷཁ ▸ ৄࡉ͸ޙड़ ▸ ֤8PSLFS/PEFʹ͚ͭͩଘࡏ kube- proxy kube let Pod

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFMFU ▸ ఆظతʹLVCFBQJTFSWFSʹ ΞΫηεͯ͠ɺ ▸ ࣗ8PSLFS/PEFͰ৽نʹಈ͔͢ 1PE͕ແ͍͔νΣοΫ͠ɺ
͋ͬͨΒίϯςφΛ࡞੒͢Δ ▸ ࣗ8PSLFS/PEF಺ͷ֤1PEΛ ؂ࢹ͠ɺݱࡏͷঢ়ଶΛFUDEʹॻ͖ࠐΉ ▸ ֤8PSLFS/PEFʹ͚ͭͩଘࡏ kube- proxy kube let kube-apiserver etcd ৽͍͠ Pod ✨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͷશମ૾ ࠶ܝ kube-apiserver kube-controller -manager kube-
scheduler etcd .BTUFS/PEF ؅ཧऀPS ։ൃऀ LVCFDUM ίϚϯυ 8PSLFS/PEFT kube- proxy kube let Pod

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ࣮͸ʮࢦشऀʯ͸ଘࡏ͠ͳ͍ ▸ ֤ίϯϙʔωϯτ͕ࣗ཯తʹಈ͘͜ͱͰɺ શମ্͕ख͘ಈ͍͍ͯΔ ▸ LVCFBQJTFSWFS͸ɺ֤ίϯϙʔωϯτʹඞཁͳ σʔλΛಧ͚ͨΓ͢ΔͷΈ
▸ ೴ʢ࢘ྩౝʣͰ͸ͳ͘৺ଁʢσʔλͷϙϯϓʣ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ύϒϦοΫΫϥ΢υͷ,VCFSOFUFT ▸ .BTUFS/PEFɾ8PSLFS/PEFͷ7.΍ɺ ͦΕΒͰಈ֤͘ίϯϙʔωϯτΛ༻ҙͯ͘͠ΕΔ ▸ ϘλϯͭͰ্هͷ༻ҙ΍ɺ֤ίϯϙʔωϯτͷ όʔδϣϯΞοϓΛͯ͘͠ΕΔ
ਓ͕ؒ1PEͷ࡞੒ʹ ूதͰ͖Δ͜ͱ͕ϝϦοτ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ຊষͷ·ͱΊ ▸ 1PE͸ͭҎ্ͷίϯςφΛ࣋ͭ ▸ ͜Ε͕؅ཧͷ࠷খ୯Ґ ▸ .BTUFS/PEF
▸ LVCFBQJTFSWFS͕৺ଁ෦ ▸ 8PSLFS/PEF ▸ ͜͜Ͱ1PE͕ಈ͘

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE %FQMPZNFOUɺ3FQMJDB4FUɺ1PE ▸ 3FQMJDB4FU͸ 1PEͷ୆਺Λ؅ཧ ▸ ୆਺Λཧ૝ͷঢ়ଶʹอͭ ▸
%FQMPZNFOU͸ 3FQMJDB4FUΛ؅ཧ ▸ 1PEͷ಺༰͕มΘͬͨΒ ৽͍͠3FQMJDB4FUΛ࡞Δ ▸ ϩʔϦϯάΞοϓσʔτ΋୲౰ Pod Pod Pod ReplicaSet Deployment

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE %FQMPZNFOUͷϚχϑΣετΛॻ͘ apiVersion: apps/v1 kind: Deployment metadata:
name: nginx-deployment labels: app: nginx spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 ports: - containerPort: 80 ͜ͷ%FQMPZNFOUͷ໊લʢ೚ҙʣ 1PEͷ୆਺ ͜ͷ%FQMPZNFOU͸ɺ ͜ͷϥϕϧΛ࣋ͭ1PEΛ؅ཧ͢Δ 1PEͷఆٛ 1PE಺ͷίϯςφΠϝʔδ 1PEʹ෇͚Δϥϕϧ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ϚχϑΣετϑΝΠϧͷΞοϓϩʔυ ▸ ϑΝΠϧ໊ࢦఆ $ kubectl apply
-f ϚχϑΣετϑΝΠϧ໊ $ kubectl apply -f ϑΥϧμ໊ ▸ ϑΥϧμ಺ͷશϚχϑΣετΛΞοϓϩʔυ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ݱࡏͷঢ়ଶͷऔಘ $ kubectl get all NAME
READY STATUS RESTARTS AGE pod/nginx-deployment-5754944d6c-mjw9j 1/1 Running 0 22s pod/nginx-deployment-5754944d6c-t4fpj 1/1 Running 0 22s pod/nginx-deployment-5754944d6c-xv7lm 1/1 Running 0 22s NAME READY UP-TO-DATE AVAILABLE AGE deployment.apps/nginx-deployment 3/3 3 3 22s NAME DESIRED CURRENT READY AGE replicaset.apps/nginx-deployment-5754944d6c 3 3 3 22s

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ݱࡏͷঢ়ଶ Pod nginx-deployment -xxx-bbb ReplicaSet nginx-deployment-xxx
Deployment nginx-deployment Pod nginx-deployment -xxx-aaa Pod nginx-deployment -xxx-ccc

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 1PEͷΈͷ৘ใऔಘ $ kubectl get pods NAME
READY STATUS RESTARTS AGE nginx-deployment-5754944d6c-mjw9j 1/1 Running 0 4m7s nginx-deployment-5754944d6c-t4fpj 1/1 Running 0 4m7s nginx-deployment-5754944d6c-xv7lm 1/1 Running 0 4m7s ▸ Լه΋Մೳ ▸ kubectl get replicasets ▸ kubectl get deployments

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ݸผ1PEͷৄࡉ৘ใऔಘ $ kubectl describe pod/nginx- deployment-5754944d6c-mjw9j
Name: nginx-deployment-5754944d6c-mjw9j Namespace: default Priority: 0 Node: docker-desktop/192.168.65.3 Start Time: Xxx, xx xxx 2020 17:02:57 +0900 Labels: app=nginx pod-template-hash=5754944d6c Annotations: <none> Status: Running IP: 10.1.0.93 IPs: <none> Controlled By: ReplicaSet/nginx-deployment-5754944d6c ...

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͔Β1PE͕࡞ΒΕΔ·Ͱ kube-apiserver etcd Ϛχ ϑΣετ ᶃ%FQMPZNFOUͷ
ɹϚχϑΣετ ɹΛ࡞੒ ᶄLVCFDUMBQQMZ ᶅϚχϑΣετΛ ɹड৴ɾղੳ ᶆ%FQMPZNFOUΛ ɹFUDEʹ࡞੒ %FQMPZ NFOU ✨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͔Β1PE͕࡞ΒΕΔ·Ͱ Deployment Controller kube-controller-manager kube-apiserver etcd
%FQMPZ NFOU ReplicaSet Controller 3FQMJDB 4FU ✨ ᶇ%FQMPZNFOU࡞੒Λݕ஌ ɹˠ3FQMJDB4FUΛ࡞੒

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͔Β1PE͕࡞ΒΕΔ·Ͱ Deployment Controller kube-controller-manager kube-apiserver etcd
%FQMPZ NFOU ReplicaSet Controller 3FQMJDB 4FU ᶈ3FQMJDB4FU࡞੒Λݕ஌ ɹˠ1PEΛඞཁݸ਺࡞੒ 1PE 1PE 1PE ✨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͔Β1PE͕࡞ΒΕΔ·Ͱ kube-scheduler kube-apiserver etcd %FQMPZ NFOU
3FQMJDB 4FU ᶉ8PSLFS/PEF͕ ɹະࢦఆͷ1PEΛݕ஌ ɹˠܾఆͯ͠ॻ͖ࠐΉ 1PE ۭ ˠ /PEF 1PE ۭ ˠ /PEF 1PE ۭ ˠ /PEF

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͔Β1PE͕࡞ΒΕΔ·Ͱ kube-apiserver etcd %FQMPZ NFOU 3FQMJDB
4FU ᶊࣗ8PSLFS/PEFѼͷ ɹ1PEΛݕ஌ ɹˠ1PEΛ৽ن࡞੒ 1PE ۭ ˠ /PEF 1PE ۭ ˠ /PEF 1PE ۭ ˠ /PEF kube- proxy kube let ৽͍͠ Pod ✨

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ຊষͷ·ͱΊ ▸ %FQMPZNFOUˠ3FQMJDB4FUˠ1PE ▸ ͜ΕΒ͸શͯFUDEʹ࡞੒͞ΕΔ ▸ ϚχϑΣετΛॻ͍ͯkubectl
applyͰ Ξοϓϩʔυ ▸ %FQMPZNFOU$POUSPMMFSɺ 3FQMJDB4FU$POUSPMMFSɺLVCFMFU͕͏·͘ಈ͘

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 1PEؒͰͲ͏΍ͬͯ௨৴͢Δʁ ▸ ֤1PE͝ͱʹ*1ΞυϨεׂ͕Γ౰ͯΒΕΔ $ kubectl get
pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES nginx-deployment-5754944d6c-mjw9j 1/1 Running 0 20h 10.1.0.98 docker-desktop <none> <none> nginx-deployment-5754944d6c-t4fpj 1/1 Running 0 20h 10.1.0.99 docker-desktop <none> <none> nginx-deployment-5754944d6c-xv7lm 1/1 Running 0 20h 10.1.0.101 docker-desktop <none> <none>

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE *1ΞυϨε͸౰ͯʹͳΒͳ͍ ▸ 1PEͷ਺͸ৗʹ૿ݮ͍ͯ͠Δ ▸ ͖ͬ͞௨৴ͨ͠1PE͸΋͏ফ͍͑ͯΔ͔΋ ▸ ௨৴૬ख͸ෳ਺1PEʹ৑௕Խ͞Ε͍ͯΔ͔΋
▸ ͲΕʹΞΫηε͢ΔʁͲ͏΍ͬͯෛՙ෼ࢄ͢Δʁ ▸ *1ΞυϨεͰ͸ͳ໊͘લͰ63-Λࢦఆ͍ͨ͠ ▸ %/4͸Ͳ͏͢Δʁ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDFͰαʔϏεσΟεΧόϦˍෛՙ෼ࢄ Service nginx- service 10.x.x.x (8080)
http://nginx-service:8080 ˞஫ɿਤ͸ΠϝʔδͰ͢ ʢৄࡉ͸ޙड़ʣ Pod nginx 10.y.y.a (80) Pod nginx 10.y.y.b (80) Pod nginx 10.y.y.c (80) ผͷPod ෛՙ ෼ࢄ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDFͷϚχϑΣετΛॻ͘ apiVersion: v1 kind: Service metadata:
name: nginx-service spec: type: ClusterIP selector: app: nginx ports: - port: 8080 targetPort: 80 ͜ͷ4FSWJDF͸ɺ ͜ͷϥϕϧΛ࣋ͭ1PEʹ ෛՙ෼ࢄ͢Δ 1PEͷϙʔτ൪߸ 4FSWJDFͷϙʔτ൪߸ 4FSWJDFͷ໊લʢ೚ҙʣ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͢Δͱ $ kubectl get service nginx-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nginx-service ClusterIP 10.96.181.49 <none> 8080/TCP 6m54s ▸ 4FSWJDF͕࡞੒͞Εɺ*1ΞυϨεͱϙʔτ൪߸͕ ׂΓ౰ͯΒΕΔ ▸ ஫ɿ͜Ε͸ϓϥΠϕʔτ*1ΞυϨεͳͷͰɺ ɹɹ,VCFSOFUFTΫϥελʔ಺ͷΈͰ͔͠࢖͑ͳ͍

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 1PEؒ௨৴Λࢼ͢ ▸ Ұ࣌తͳ$FOU04ͷ1PEΛ࡞Γɺ ͔ͦ͜ΒDVSMͰΞΫηε͢Δ $ kubectl
run temp --image=centos \ --rm --restart=Never -it \ -- curl http://nginx-service:8080 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> Cent OS nginx nginx nginx Service

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDF࡞੒͔Βෛՙ෼ࢄ·Ͱ kube-apiserver etcd Ϛχ ϑΣετ ᶃ4FSWJDFͷ
ɹϚχϑΣετ ɹΛ࡞੒ ᶄLVCFDUMBQQMZ ᶅϚχϑΣετΛ ɹड৴ɾղੳ ᶆ4FSWJDFΛFUDEʹ࡞੒ *1ΞυϨε΋෇Ճ͞ΕΔ 4FSWJDF ✨ %FQMPZ NFOU 3FQMJDB 4FU 1PE

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDF࡞੒͔Βෛՙ෼ࢄ·Ͱ kube- proxy kube let kube-apiserver
etcd 4FSWJDF %FQMPZ NFOU 3FQMJDB 4FU 1PE Pod ᶇ4FSWJDF࡞੒Λݕ஌ ɹˠ4FSWJDFͱ෼ࢄର৅1PEͷ ɹɹ*1ΞυϨεɾϙʔτ൪߸Λऔಘ ɹˠJQUBCMFTʹ௥Ճ ˞JQUBCMFTҎ֎ͷ৔߹΋͋Γ·͢

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE JQUBCMFT 8JLJQFEJBΑΓ ▸ JQUBCMFT͸ɺ-JOVYʹ࣮૷͞ΕͨύέοτϑΟϧ λϦϯά͓ΑͼωοτϫʔΫΞυϨεม׵ /"5 ػೳͰ͋Δ/FUpMUFSʢෳ਺ͷ/FUpMUFSϞ
δϡʔϧͱ࣮ͯ͠૷͞Ε͍ͯΔʣͷઃఆΛૢ࡞͢ ΔίϚϯυͷ͜ͱɻ/FUpMUFS͸ɺ͍ΘΏΔϑΝ ΠΞ΢Υʔϧ΍ϧʔλͱͯ͠ͷ໾ׂΛՌͨ͢ɻ https://ja.wikipedia.org/wiki/Iptables

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDF࡞੒͔Βෛՙ෼ࢄ·Ͱ kube- proxy Pod temp DNS
ᶈ%/4ʹ4FSWJDF໊ͷ ɹ໊લղܾΛґཔ ɹˠ4FSWJDFͷ*1ΞυϨεΛऔಘ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE %/4 ▸ ,VCFSOFUFTΫϥελʔ಺ʹଘࡏ͢Δ %/4αʔόʔ ▸ ඞਢͷίϯϙʔωϯτͰ͸ͳ͍͕ɺ ͍͍ͩͨͷ,VCFSOFUFT؀ڥʹ͸ೖ͍ͬͯΔ
▸ .BTUFS/PEFͷίϯϙʔωϯτ͔Ͳ͏͔͸ෆ໌ ▸ %PDLFS΍(,&Ͱ͸1PEͱͯ͠ಈ͍͍ͯΔ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDF࡞੒͔Βෛՙ෼ࢄ·Ͱ kube- proxy Pod temp kube-
proxy Pod nginx ᶉ4FSWJDFͷ ɹ*1ϙʔτ൪߸ ɹʹΞΫηε ᶊJQUBCMFTΛ࢖ͬͯɺ ɹѼઌ*1ɾϙʔτΛ ɹ͍ͣΕ͔ͷ1PEͷ ɹ΋ͷʹมߋ kube- proxy Pod nginx kube- proxy Pod nginx ᶋมߋ͞ΕͨѼઌʹΞΫηε

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE kube-proxy Pod temp kube- proxy kube-
proxy kube- proxy 1PE OHJOY 1PE OHJOY 1PE OHJOY ServiceͷIPΞυϨεͱϙʔτ൪߸ =10.9.9.9:99 ͦͷService͕؅ཧ͢ΔPodͷ IPΞυϨεͱϙʔτ൪߸ ʹ10.0.0.1:80, 10.0.0.2:80, 10.0.0.3:80 ᶉ http://10.9.9.9:99/ ᶋ http://10.0.0.2:80/ ᶊѼઌIPΞυϨεɾϙʔτ൪߸ ɹΛॻ͖׵͑ʢ3ͭΛॱ൪ʹ࢖͏ʣ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ຊষͷ·ͱΊ ▸ 4FSWJDFͰΫϥελʔ಺αʔϏεσΟεΧόϦͱ ෛՙ෼ࢄΛ࣮ݱ ▸ 4FSWJDFͷਖ਼ମ͸ %/4
LVCFQSPYZ JQUBCMFT ▸ ͨͩ͠؀ڥʹΑΔ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE 4FSWJDFͷ໰୊఺ ▸ Ϋϥελʔ಺ͷ௨৴͔͠Ͱ͖ͳ͍ ▸ 4FSWJDFͷUZQFΛʮ/PEF1PSUʯʮ-PBE#BMBODFSʯ ʹมߋ͢Ε͹Մೳʢࠓճ͸είʔϓ֎ʣ ▸
-ɾ-Ϩϕϧͷ৘ใ͔͠ݟͳ͍ ▸ )551௨৴ͷ63-Λݟͯʮ͜ͷ63-ͳΒ͜ͷ1PEʯ ͷΑ͏ͳ෼ࢄ͸Ͱ͖ͳ͍

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE *OHSFTTͰΫϥελʔ֎௨৴ Ϋϥ΢υϕϯμʔͷ ϩʔυόϥϯαʔ Ingress Controller Service
A Service B Pod A Pod A Pod B Pod B 63-ʹΑͬͯ ৼΓ෼͚Δ ෛՙ ෼ࢄ ෛՙ ෼ࢄ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE /(*/9*OHSFTT$POUSPMMFS ▸ *OHSFTT$POUSPMMFS࣮૷ͷͭ ▸ ໊લͷ௨Γ/HJOYΛ࢖͍ͬͯΔ ▸ ؀ڥผΠϯετʔϧํ๏͸Լهࢀর
▸ IUUQTLVCFSOFUFTHJUIVCJPJOHSFTTOHJOY EFQMPZ ▸ ࠓճ͸(,&Λར༻

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE /(*/9*OHSFTT$POUSPMMFSͷΠϯετʔϧ (,& $ kubectl create clusterrolebinding
cluster-admin-binding --clusterrole cluster-admin --user $(gcloud config get- value account) $ kubectl apply -f https:// raw.githubusercontent.com/kubernetes/ ingress-nginx/controller-v0.34.0/deploy/ static/provider/cloud/deploy.yaml

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ΠϯετʔϧͰ࡞ΒΕΔ΋ͷ Ϋϥ΢υϕϯμʔͷ ϩʔυόϥϯαʔ NGINX Ingress Controller
(Pod) Service A Service B Pod A Pod A Pod B Pod B ˞ଞʹ΋৭ʑ࡞ΒΕΔͷͰ͕͢ɺॏཁͳͷ͸͜ͷͭͰ͢

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE *OHSFTTͷϚχϑΣετΛॻ͘ kind: Ingress apiVersion: networking.k8s.io/v1beta1 metadata:
name: echo-ingress labels: app: echo annotations: kubernetes.io/ingress.class: nginx spec: rules: - http: paths: - path: /a backend: serviceName: echo-a-service servicePort: 80 - path: /b backend: serviceName: echo-b-service servicePort: 80 ͜ͷαʔϏεʹ ϧʔςΟϯά ͜ͷ63-͕ϦΫΤετ͞ΕͨΒ *OHSFTTͷ໊લʢ೚ҙʣ ͜ͷ63-͕ϦΫΤετ͞ΕͨΒ ͜ͷαʔϏεʹ ϧʔςΟϯά

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE LVCFDUMBQQMZ͢Δͱ $ kubectl get ingress NAME
HOSTS ADDRESS PORTS AGE echo-ingress * 34.71.xxx.xxx 80 63m ▸ *OHSFTT͕࡞੒͞Εɺ*1ΞυϨεͱϙʔτ൪߸͕ ׂΓ౰ͯΒΕΔ ▸ ͜Ε͸Ϋϥ΢υϕϯμʔͷϩʔυόϥϯαʔͷ *1ΞυϨε

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ΞΫηε $ curl 34.71.xxx.xxx/a A(echo-a-deployment-dd985bcfc-fcjpf) $
curl 34.71.xxx.xxx/a A(echo-a-deployment-dd985bcfc-qk6hp) $ curl 34.71.xxx.xxx/b B(echo-b-deployment-68854964db-zjcmh) $ curl 34.71.xxx.xxx/b B(echo-b-deployment-68854964db-qrr2n) ▸ 63-ʹΑͬͯҧ͏4FSWJDFʹϧʔςΟϯά͞Ε͍ͯΔ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ຊষͷ·ͱΊ ▸ ·ͣ*OHSFTT$POUSPMMFSͷΠϯετʔϧ͕ඞཁ ▸ ϩʔυόϥϯαʔͱ*OHSFTT$POUSPMMFSͷ1PE͕ ࡞ΒΕΔ ▸
*OHSFTTΛ࡞੒͢Δ͜ͱͰɺΫϥελʔ֎͔Βͷ ΞΫηε΍63-ͰͷϧʔςΟϯά͕ՄೳʹͳΔ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ϚΠΫϩαʔϏε΍Γ·͔͢ʁ ▸ ϚΠΫϩαʔϏεͰͳ͍ͳΒ,VCFSOFUFT͸ ඞཁͳ͍ ▸ ϚΠΫϩαʔϏεͰ͋ͬͯ΋ ʮ,VCFSOFUFT͸αʔϏε͕਺ेʹͳ͔ͬͯΒʯ
ʢCZླ໦༤հ͞Μʣ ▸ IUUQTXXXTMJEFTIBSFOFUZVTVLF TT

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ϚΠΫϩαʔϏε΁ͷ४උ͸0,Ͱ͔͢ʁ ▸ ಺੡Խ͍ͯ͠·͔͢ʁ ▸ $*$%ମ੍͸੔͍ͬͯ·͔͢ʁ ▸ ʰϓϩμΫγϣϯϨσΟɾϚΠΫϩαʔϏεʱ͸
ಡΈ·͔ͨ͠ʁ ▸ ٕज़త೉қ౓͕ඈ༂తʹߴ·Δ͜ͱ͸৫ΓࠐΈ ࡁΈͰ͔͢ʁ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͰϚϧνΫϥ΢υʁ ▸ ,VCFSOFUFT͚ͩͰ͸ϚϧνΫϥ΢υ͸࣮ݱͰ͖ͳ͍ ▸ ϕϯμʔಠࣗαʔϏεΛ࢖ͬͯͨΒΞ΢τ ▸ ׬શʹ͸Ϋϥ΢υϕϯμʔϩοΫΠϯΛճආͰ͖ͳ͍
▸ ίϯςφϥϯλΠϜͷҧ͍ͳͲ ▸ ϚϧνΫϥ΢υͰՄ༻ੑ͸ඞͣ͠΋্͕Βͳ͍ ▸ ;0;0ͷݕ౼ఀࢭࣄྫ IUUQTRJJUBDPNTPOPUTJUFNTGEFFBFF

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFTͷӡ༻ମ੍͸੔͍ͬͯ·͔͢ʁ ▸ ,VCFSOFUFTઐ೚͕ෳ਺໊ඞཁ ▸ ͸ͯͳͷఫୀࣄྫ IUUQTXXXBUNBSLJUDPKQBJUBSUJDMFT OFXTIUNM
▸ ϲ݄ʹճͷΞοϓσʔτʹ଱͑ΒΕΔ͔ʁ ▸ ΞϓϦέʔγϣϯͷςετɺؔ࿈044ͷςετɺ 7.ͷ04ΞοϓσʔτɺϑΝʔϜ΢ΣΞͷΞοϓσʔτ ͳͲ΋ඞཁ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ,VCFSOFUFT͡Όͳͯ͘΋ྑ͍ͷͰ͸ʁ ▸ $*$%ମ੍Λ੔͑Δ͚ͩͰ΋૬౰ͳޮՌ͕͋Δ ͷͰ͸ʁ ▸ 1BB4Λ׆༻ͨ͠΄͏͕ྑ͍ͷͰ͸ʁ ▸
ʮΞϓϦέʔγϣϯΛಈ͔͢ʯͱ͍͏؍఺Ͱ͸ ,VCFSOFUFTΑΓ΋ߴػೳ

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ͓͢͢Ίॻ੶ ▸ ΤίγεςϜͱ ࢓૊ΈΛ஌Δ ▸ ΑΓਂ͘
࢓૊ΈΛ஌Δ ▸ ܾఆ൛త ϦϑΝϨϯε

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ίϛϡχςΟʹߦͬͯΈΑ͏ ▸ ,VCFSOFUFT.FFUVQ5PLZP ▸ IUUQTLTKQDPOOQBTTDPN ▸ $MPVE/BUJWF.FFUVQ5PLZP
▸ IUUQTDMPVEOBUJWFDPOOQBTTDPN ▸ $MPVE/BUJWF%FWFMPQFST+1 ▸ IUUQTDOEDPOOQBTTDPN

$ $"4"3&"- *OD"MMSJHIUTSFTFSWFE ࠷ޙͷ·ͱΊ ▸ ,VCFSOFUFTͷ΍Δ͜ͱɾ΍Βͳ͍͜ͱΛ೺Ѳ͠Α ͏ ▸ ֤ίϯϙʔωϯτ͕ࣗ཯తʹಈ͘͜ͱͰɺ ݁Ռతʹશମ্͕ख͘ಈ͍͍ͯΔ
▸ 1PEɾ3FQMJDB4FUɾ%FQMPZNFOUɾ4FSWJDFɾ *OHSFTTΛ·ͣཧղ͠Α͏ ▸ Կ͕͍ͨ͠ͷ͔ɺຊ൪౤ೖલʹ͔ͬ͠Γߟ͑Α͏

2時間で分かる！Kubernetesとは何なのか / what-is-kubernetes

2時間で分かる！Kubernetesとは何なのか / what-is-kubernetes

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