10分くらいで雑に理解する KubernetesとEKS

by masa_charcoal (masachaco)

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10෼͘Β͍Ͱ ࡶʹཧղ͢Δ KubernetesͱEKS @masachaco

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ࣗݾ঺հ HN:·ͪ͞Ό͜ • ۂͱ͔࡞ΔϓϩάϥϚ ܥ SIer • ϓϩάϥϛϯάݴޠ: Java / node.js • αʔόαΠυΞϓϦɺεϚʔτεϐʔΧʔΞϓϦͷ։ൃ • ٶͪΌΜͷসإۦಈ։ൃ • χίχίಈըͰϛΫ͞ΜୡͷۂΛެ։தʂ • Twitter • @masachaco • GitHub • https://github.com/masachaco • SoundCloud • https://soundcloud.com/masa_charcoal • niconico • https://www.nicovideo.jp/mylist/11613193

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એ఻

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΋͘͡ • ͸͡Ίʹ • KubernetesͷୈҰҹ৅ͱɺಈػ • ίϯςφͬͯ ?& ίϯςφͷࠔΓ͝ͱ • Kubernetesͬͯ • ࢖ͬͯΈΔʹ͸ • ڝ߹ͱͷൺֱ • ॴײ

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༧๷ઢ ͸͡Ίʹ • ͜ͷεϥΠυͷ࡞ऀ͸ɺKubernetesॳ৺ऀͰ͢ • ࡞ऀ͸Kubernetes࣮ӡ༻ͨ͜͠ͱ͕͋Γ·ͤΜ • AMIͳͲɺAWSͷલఏ஌͕ࣝ͋Δ্ͰͷεϥΠυͰ͢ • ؒҧ͍ɺ͝ࢦఠͳͲ͋Δͱࢥ͏ͷͰɺ • Twitterɺ@masachaco·Ͱ͝࿈བྷ͍ͩ͘͞

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࠷͍ۙΖ͍Ζͳͱ͜ΖͰฉ͘ Kubernetes

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ࢲͷ๊͍͍ͯͨKubernetes • ࠷ۙ΍ͨΒษڧձ΍ɺΧϯϑΝϨϯε΍ɺه ࣄͰݟΔ • Ͳ͏΍ΒɺίϯςφपΓΛ͍͍ײ͡ʹ؅ཧ͠ ͯ͘ΕΔΒ͍͠ • ҰମԿΛͯ͘͠ΕΔͷʁͳΜͰඞཁͳͷʁ

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ಈػ • ࿩୊ͷKubernetesΛ৮Γ͚ͩͰ΋஌Γ͍ͨ • ࠓޙओྲྀʹͳΓͦ͏͚ͩͲΘ͔Βͳͯ͘ා͍ • ։ൃ͢Δࡍʹɺӡ༻Λҙ͍ࣝͨ͠ • ͪΐͬͱ࢖ͬͯΈͯυϠإ͕͍ͨ͠ (࠷ॏཁ)

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ৄ͍͠࢖͍ํ͸ͱ΋͔͘ ֓ཁΛ஌Γ͍ͨ

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ͳͷͰ

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ࢀߟॻ(൒෼͘Β͍)ಡΜͰ ͓͓Αͦͷશମਤ௫ΜͰ

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νϡʔτϦΞϧࢼͯ͠Έͨ

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͜ΕΒΛ΍ͬͯΈ๊͍ͯͨ KubernetesͷΠϝʔδ

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Ͳ͏΍Β Kubernetes ͸

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ίϯςφ पΓΛ ͍͍ײ͡ʹ

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؅ཧ ͯ͘͠ΕΔΒ͍͠

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ͦ΋ͦ΋ίϯςφͬͯʁ • ίϯςφܕԾ૝Խͱݺ͹ΕΔԾ૝Խٕज़

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Ծ૝Խٕज़ʹର͢Δҹ৅

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Ծ૝Խٕज़ʹର͢Δҹ৅ • VM Wareͱ͔Virtual BoxͷΑ͏ʹ • OSͷ্ͰɺOSΛಈ͔͢ • OSΛOSͷ্Ͱಈ͔͢ͷͰॏ͍ • ৽نʹOSΠϯετʔϧΑΓ͸ָ

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ͦΕ͸ • Virtual Box΍VM WareͳͲͷϗετܕԾ૝Խ • ओʹKubernetes͕ѻ͏΍ͭͰ͸ͳ͍(͸ͣ) • OSͷ্ʹɺผͷOSΛಈ͔͢ • Windowsͷ্ʹCent OSΛಈ͔ͨ͠Γ • Windowsͷ্ʹWindowsΛಈ͔ͨ͠ΓͰ͖Δ

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ͦΕͱ͸ผʹ • ίϯςφܕԾ૝Խ • ίϯςφͱ͍͏OSͬΆ͍؀ڥΛOS্ʹߏஙͯ͠ΞϓϦΛಈ͔͢ • Χʔωϧ౳ɺίϯςφΛಈ͢Ϛγϯͷ෺Λɺڞ༗ͯ͠࢖ͬͨΓ͢Δ • OSͬΆ͍؀ڥͰɺϦιʔεڞ༗ͨ͠Γ͢ΔͷͰൺֱతܰ͘ಈ͘ • ڞ༗͢ΔϦιʔεͱ͔ϗετ͕४උࡁΈͳͷͰɺىಈ΋ૣ͍ • Kubernetes͸ͬͪ͜ͷλΠϓͷԾ૝ԽΛѻ͏

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ίϯςφܕԾ૝ԽͷΠϝʔδ RedHatLinuxͱ͔OS DockerͳͲͷϛυϧ΢ΣΞ ίϯςφ (OSͬΆ͍΋ͷ) ίϯςφ (OSͬΆ͍΋ͷ) SpringBootͳͲ ΞϓϦέʔγϣϯ MySQLͳͲ ΞϓϦέʔγϣϯ

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OSͬΆ͍ίϯςφ͸ ɹผʑͷ OS ͷΑ͏ʹ ෼அ͞Εͯಈ͍͍ͯΔͷͰ ޓ͍ʹӨڹΛड͚ʹ͍͘

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ίϯςφ͸ ϗετOSͷϦιʔεΛ ࢖͑ΔͷͰ ൺֱత͍ܰ

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ίϯςφͷࠔΓ͝ͱ

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࣮ࡍʹӡ༻͢Δͱ͖ Ͳ͏͢Δʁ

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ྫ͑͹

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όοΫΤϯυαʔό͸3ίϯςφߏ੒ DBαʔό͸̍ίϯςφߏ੒Ͱಈ͔͍ͨ͠ ※Ͱ͖Δ͚ͩ ෳ਺ͷ஍Ҭʹۉ౳ʹ෼ࢄ͍ͤͨ͞

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AWSͱ͔ʹϚϧνAZͰίϯςφΛཱͯͯΈΔ Region AWS AZ-1 AZ-2

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AWSͱ͔ʹϚϧνAZͰίϯςφΛཱͯͯΈΔ Region AWS AZ-1 AZ-2 γεςϜશମͰ όοΫΤϯυαʔό͕Կίϯςφಈ͍ͯͯ %#͕Կίϯςφಈ͍͍ͯΔ͔ ୭͕೺Ѳ͢ΔΜͩΖ͏ʁ γεςϜશମͰ όοΫΤϯυαʔό͕ɺίϯςφಈ͍ͯͯ %#͕ɺίϯςφಈ͘Α͏ʹ͍ͨ͠ɻ ͬͯͦΕ୭͕؅ཧ͢ΔΜʁ

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ͬͯͦΕɺ୭͕؅ཧ͢ΔΜʂʁ • Ϋϥ΢υશମͰಈ͍͍ͯΔίϯςφͷ਺ͱ͔୭͕೺Ѳͯ͠Δͷ • σϓϩΠ͢Δ࣌ʹɺطଘͷίϯςφམͱͨ͠Γɾ৽نʹ্ཱͪ ͛ͨΓ͢ΔॱংɾλΠϛϯά • ίϯςφपΓͷϦιʔε • ετϨʔδͱ͔ɺϩʔυόϥϯαͱ͔ɺωοτϫʔΫͱ͔ • ίϯςφ΍ɺϦιʔεͷґଘؔ܎ • ࢭ·ͬͯΔίϯςφͷऴྃͱ࠶ىಈͱ͔

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ਓͷखͰ͸ ΍Γͨ͘ͳ͍ɻɻɻɻ

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ෳ਺ͷϦʔδϣϯɾαʔόΛލ͍Ͱ΋ ίϯςφपΓΛ Ұݩతʹ؅ཧ͍ͨ͠

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ͦ͜Ͱ

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Kubernetes

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters Kubernetes Node Kubernetes Node ίϯςφपΓ Ұݩతʹ ؅ཧ͢Δ΍ͭ Pod Pod ଞͷPod ଞͷPod

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters ̍αʔό୯Ґͷ ࣮ߦ؀ڥ %PDLFSͱ͔ ಈ͍ͯΔ Kubernetes Node Kubernetes Node Pod Pod ଞͷPod ଞͷPod ̍αʔό୯Ґͷ ࣮ߦ؀ڥ %PDLFSͱ͔ ಈ͍ͯΔ

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters Kubernetes Node Kubernetes Node Pod Pod ίϯςφͱ͔ͷ ू·Γ ίϯςφͱ͔ͷ ू·Γ ଞͷPod ଞͷPod

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters Kubernetes Node Kubernetes Node Pod Pod ଞͷPod ଞͷPod /PEF1PEͷঢ়گʹ Αͬͯ ίϯςφཱͯͨΓ ͢Δ ίϯςφ ࢭ·ͬͯͨΒ ࠶࡞੒ͨ͠Γ͢Δ

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters Kubernetes Node Kubernetes Node Pod Pod ଞͷPod ଞͷPod ͜Εશମ͕,VCFSOFUFT

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters Kubernetes Node Kubernetes Node yaml ZBNMܗࣜͷࢦࣔॻΛݩʹ ,VCFSOFUFT.BTUFSʹࢦࣔ /PEFΛ؅ཧͤ͞Δ

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Kubernetesͷͬ͘͟Γߏ੒ Kubernetes Masters Kubernetes Node Kubernetes Node yaml LVCFDUMͱ͍͏ίϚϯυΛ࢖ͬͯ ZBNMʹॻ͔ΕͨࢦࣔΛ ,VCFSOFUFT.BTUFSʹ ൓өͤ͞Δ

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ྫ $kubectl apply -f example-backend.yaml ※ example-backend.yamlʹ͸ɺͲΜͳײ͡ʹ ͲͷΑ͏ͳίϯςφΛཱͯΔ͔ॻ͍ͯ͋Δ ྫ͑͹ɺ͜ͷλΠϓͷίϯςφ͸͍ͭ͘࡞ͬͯɺͱ͔ɻ

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࣮ࡍ͸CI͕kubectlΛ࣮ߦͨ͠Γ͢Δ Kubernetes Masters Kubernetes Node Kubernetes Node yaml ͜Μͳײ͡ʹ͓ئ͍ ͸͍Αʔ

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ίϯςφपΓʹ͍ͭͯ • ίϯςφ্Ͱಈ͘ΞϓϦҎ֎΋؅ཧ͢Δ • ίϯςφʹׂΓ౰ͯΔετϨʔδͱ͔ • ίϯςφͷෛՙ෼ࢄͱ͔ (ϩʔυόϥϯαͱ͔࡞ΕΔ) • ίϯςφͷωοτϫʔΫͱ͔ • ίϯςφ΁ͷΞΫηεݖݶͱ͔

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Kubernatesͷ֓ཁ͸ Ұ୴ऴΘΓ

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ؾʹͳΔͱ͜Ζ

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Kubernetesͷӡ༻͕ େม͡Όͳ͍ʁ

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Ϧʔδϣϯލ͍Ͱ ίϯςφ؅ཧͨ͠Γ ϩʔυόϥϯαཱͯͨΓ ετϨʔδׂΓ౰ͯͨΓ

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େมὑ

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ͳͷͰ

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Amazon EKS Amazon Ϛωʔδυ(Amazon͕Ұ෦؅ཧͯ͘͠ΕΔ)ͷɺ KubernetesαʔϏεɻ

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Amazon EKS Kubernetes Masters Kubernetes Node Kubernetes Node ͍͍ͩͨ͜ΕΛ Ϛωʔδυ "NB[PO؅ཧ Ͱ ӡ༻ͯ͘͠ΕΔ

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Amazon EKS Amazon EKS Kubernetes Node Kubernetes Node ͬͪ͜͸ࣗ෼Ͱӡ༻͢Δඞཁ͕͋Δ ͬͪ͜͸ࣗ෼Ͱӡ༻͢Δඞཁ͕͋Δ

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ҊͣΔΑΓੜΉ͕қ͠ νϡʔτϦΞϧΛ৮ͬͯΈΔʂ ■ Amazon EKSͷ࢖༻։࢝ https://docs.aws.amazon.com/ja_jp/eks/latest/userguide/getting-started.html

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ϝϦοτ • Kubernetes MastersͷεέʔϧͳͲɺӡ༻ΛҰ෦AWSʹ೚ͤΒΕΔ • ϩʔυόϥϯα΍ετϨʔδɺωοτϫʔΫͳͲAWS Ϛωʔδυͷ෺ Λ࢖༻Ͱ͖Δ • ͭ·ΓɺͦΕΒͷӡ༻ΛҰ෦AWSʹ೚ͤΒΕΔ • Kubernetesͷݖݶ؅ཧͳͲΛIAMϕʔεͰ؅ཧͰ͖Δ • Ϧιʔεͷݖݶ؅ཧ΍࢖͍৺஍Λ౷ҰͰ͖Δ • ͳͲͳͲ

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EKSͱ ࣅͯ ඇͳΔ΋ͷ

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Ұ෦ڝ߹ͱͷൺֱ • Amazon ECS (Elastic Container Service) • EKSಉ༷ʹAWS ϚωʔδυͰίϯςφΛ؅ཧͰ͖ΔαʔϏε • KubernetesΑΓൺֱతγϯϓϧʹίϯςφΛӡ༻Ͱ͖Δ • ίϯςφΛಈ͔͢αʔόΛɺ؅ཧ͠ͳ͍͍ͯ͘ڧྗͳFargete͕࢖͑Δ • ෳ਺ͷίϯςφΛѻΘͳ͍͍ͯ͘γϯϓϧߏ੒ͳΒɺECSָ͕ͦ͏ • ϩʔυόϥϯαͳͲɺωοτϫʔΫपΓ΍ετϨʔδ͸ผαʔϏεͱ͠ ͯ؅ཧ͢Δඞཁ͕͋Δ Amazon ECS

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·ͱΊ • Kubernetes͸ෳ਺ίϯςφΛ؅ཧ͢Δඞཁ͕͋Δ࣌ʹɺཔΕΔ • ίϯςφपΓͷωοτϫʔΫ΍ετϨʔδ΋Ұݩతʹ؅ཧͰ͖ Δɻ • ͳͷͰɺଟ਺ͷෳ਺ίϯςφΛѻ͏ɺϚΠΫϩαʔϏεӡ༻͢ Δ৔߹ͱ͔ʹศརͦ͏ • AWSͰίϯςφͷछྨ͕ͦΜͳʹଟ͘ͳ͚Ε͹ɺ΋͏ͪΐͬͱ ؆ૉͳECSͷํ͕γϯϓϧͰྑͦ͞͏

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͝੩ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠

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νϡʔτϦΞϧΛߦ͏্Ͱͷ஫ҙ • ݱঢ়౦ژϦʔδϣϯͰ΋ɺEKSͷνϡʔτϦΞϧ͸Ͱ͖Δ • aws-cliͱɺEKSߏஙʹඞཁͳcredential(ೝূ৘ใ)͕ઃఆࡁΈͰ͋ Δඞཁ͕͋Δ • ϊʔυΛߏங͢ΔͨΊͷɺEKS༻AMI (EKS࠷దԽAMI) ͸ • ౦ژϦʔδϣϯʹͳ͍ɻϦʔδϣϯؒίϐʔ͢Δඞཁ͕͋Δɻ • ৄ͘͠͸ʮAMI ϦʔδϣϯؒίϐʔʯͰݕࡧʂ ※ CloudFormationͰɺVPSͷߏஙͳͲओ୊͡Όͳ͍ͱ͜Ζ͸ָʹεΩοϓͰ͖ΔͷΊͬͪΌؾ͍͍࣋ͪ

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νϡʔτϦΞϧΛ΍Δલʹ • ʮKubernetes ׬શΨΠυʯΛಡΜͰ͍͍ͩͨͷ શ๴Λ௫ΜͰ͍ΔͱɺΘ͔Γ΍͔ͬͨ͢    (͋ʔɺͦʔΏʔ͜ͱͶɺ׬શʹཧղͨ͠ɻˡΘ͔ͬͯͳ͍ ) 