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Kubernetes Wakaran Tokyo #1 Discussion Theme

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Prerequisite Knowledge

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What’s Kubernetes • ίϯςφԽ͞ΕͨΞϓϦέʔγϣϯ΍αʔϏεΛ ؅ཧ͢ΔͨΊͷΦʔϓϯιʔεϓϥοτϑΥʔϜ ϩʔϦϯάΞοϓσʔτ εέʔϦϯά / ΦʔτεέʔϦϯά ίϯςφͷࢮ׆؂ࢹ ো֐࣌ͷηϧϑώʔϦϯά etc…

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What’s Container • ಉ͡OS্Ͱ෼཭͞ΕͨίϯςφۭؒΛ༻ҙ͠ɺݸʑʹΞϓϦέʔ γϣϯ΍ϥΠϒϥϦΛಈ͔͢͜ͱ͕Ͱ͖Δɻ • ΞϓϦέʔγϣϯʹՃ͑ͯɺOS ͱͦͷؔ࿈πʔϧ͕༰ྔʹؚ·ΕΔ VMͱൺֱ͢ΔͱϦιʔε໘Ͱͷܰྔੑ΍ɺىಈεϐʔυͷ଎͞ͳͲ ͷϝϦοτ͕͋Δଞɺϝϯςφϯεͷ؆қԽ౳༷ʑͳར఺͕͋Δɻ ෺ཧαʔό ෺ཧαʔό ϗετOS ϋΠύʔόΠβʔ Ծ૝ԽSW ήετOS ήετOS ήετOS ήετOS app app app app app app app ෺ཧαʔό ίϯςφΤϯδϯ VM Container

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What’s Pod • KubernetesͰ࡞੒͓Αͼ؅ཧͰ͖ΔɺσϓϩΠ Մೳͳ࠷খͷίϯϐϡʔςΟϯά୯Ґɻ • 1ͭҎ্ͷίϯςφͰߏ੒͞ΕΔɻ • Podʹ͸1ͭͷNic͕༩͑ΒΕɺίϯςφؒͰͦͷ 1ͭͷNicΛڞ༗͢Δɻ

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Today’s Topic 1-1. Podͷ࡞੒ 1-2. Serviceͷ࡞੒ 1-3. Replicaͷੜ੒ ~ ൃల ~ 2-1. Updateઓུ

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Podͷ࡞੒ ྡͷmanifestʹҎԼͷࣄ߲Λ௥هͯ͠ɺ PodΛ࡞੒͠·͠ΐ͏ • Container name: nginx • Image: nginx (version 1.17.5) • Port: 80

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Serviceͷ࡞੒ ྡͷmanifestΛ༻͍ͯɺService Λ࡞੒͠·͢ɻ ͦͷޙɺlocalhost:30080ʹΞΫηεͯ͠ɺ ҎԼͷΑ͏ͳը໘͕ग़Δ͜ͱΛ֬ೝ͠·͢ɻ

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Replicaͷੜ੒ • ೚ҙͷWorkloads ResourceΛ༻͍ͯɺ[1. Podͷ࡞੒]Ͱ࡞੒ͨ͠podΛ 4 replicaͷϦιʔεͱͯ͠࡞੒͍ͯͩ͘͠͞ɻ ·ͨɺͦͷWorkloads ResourceΛબ୒ͨ͠ཧ༝ʹ͍ͭͯ·ͱΊͯΈ·͠ΐ͏ɻ Workloads Resource: Pod, ReplicaSet, Deployment, DaemonSet, StatefulSet Updateઓུ • [3. Replicaͷੜ੒]ʹͯ࡞੒͞ΕϦιʔεʹ࢖༻͞Ε͍ͯΔnginxͷversionΛ1.17.7 ʹ্͛Α͏ͱߟ͍͑ͯ·͢ɻμ΢ϯλΠϜ͕ͳ͍Α͏ʹΞοϓσʔτΛ͢Δʹ͸ɺ ɹmanifestʹ͓͍ͯɺͲͷΑ͏ͳ͜ͱΛઃఆ͢Δඞཁ͕͋ΔͰ͠ΐ͏͔ɻ ɹཧ༝΋ؚΊͯɺmanifestΛߏ੒ͯ͠Έ͍ͯͩ͘͞ɻ

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ൃද಺༰ 1. [Replicaͷੜ੒]ʹ͓͍ͯɺ 1-1. ͲͷWorkloads ResourceΛબ୒ͨ͠ͷ͔ 1-2. ͳͥͦΕΛબ୒ͨ͠ͷ͔ 2. [Updateઓུ]ʹ͓͍ͯ 2-1. ͲͷΑ͏ͳmanifestΛߏஙͨ͠ͷ͔ 2-2. manifestΛߏங͢Δʹ͋ͨΓɺԿΛߟྀͨ͠ͷ͔ (strategy΍maxSurge, maxUnavailableͳͲ)