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meetup_topic__1.pdf
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ry
February 10, 2020
Education
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660
meetup_topic__1.pdf
Kubernetes Wakaran Tokyo #1にて扱う問題です。
ry
February 10, 2020
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Transcript
Kubernetes Wakaran Tokyo #1 Discussion Theme
Prerequisite Knowledge
What’s Kubernetes • ίϯςφԽ͞ΕͨΞϓϦέʔγϣϯαʔϏεΛ ཧ͢ΔͨΊͷΦʔϓϯιʔεϓϥοτϑΥʔϜ ϩʔϦϯάΞοϓσʔτ εέʔϦϯά / ΦʔτεέʔϦϯά ίϯςφͷࢮ׆ࢹ
ো࣌ͷηϧϑώʔϦϯά etc…
What’s Container • ಉ͡OS্Ͱ͞ΕͨίϯςφۭؒΛ༻ҙ͠ɺݸʑʹΞϓϦέʔ γϣϯϥΠϒϥϦΛಈ͔͢͜ͱ͕Ͱ͖Δɻ • ΞϓϦέʔγϣϯʹՃ͑ͯɺOS ͱͦͷؔ࿈πʔϧ͕༰ྔʹؚ·ΕΔ VMͱൺֱ͢ΔͱϦιʔε໘Ͱͷܰྔੑɺىಈεϐʔυͷ͞ͳͲ ͷϝϦοτ͕͋Δଞɺϝϯςφϯεͷ؆қԽ༷ʑͳར͕͋Δɻ
ཧαʔό ཧαʔό ϗετOS ϋΠύʔόΠβʔ ԾԽSW ήετOS ήετOS ήετOS ήετOS app app app app app app app ཧαʔό ίϯςφΤϯδϯ VM Container
What’s Pod • KubernetesͰ࡞͓ΑͼཧͰ͖ΔɺσϓϩΠ Մೳͳ࠷খͷίϯϐϡʔςΟϯά୯Ґɻ • 1ͭҎ্ͷίϯςφͰߏ͞ΕΔɻ • Podʹ1ͭͷNic͕༩͑ΒΕɺίϯςφؒͰͦͷ 1ͭͷNicΛڞ༗͢Δɻ
Today’s Topic 1-1. Podͷ࡞ 1-2. Serviceͷ࡞ 1-3. Replicaͷੜ ~ ൃల
~ 2-1. Updateઓུ
Podͷ࡞ ྡͷmanifestʹҎԼͷࣄ߲Λهͯ͠ɺ PodΛ࡞͠·͠ΐ͏ • Container name: nginx • Image: nginx
(version 1.17.5) • Port: 80
Serviceͷ࡞ ྡͷmanifestΛ༻͍ͯɺService Λ࡞͠·͢ɻ ͦͷޙɺlocalhost:30080ʹΞΫηεͯ͠ɺ ҎԼͷΑ͏ͳը໘͕ग़Δ͜ͱΛ֬ೝ͠·͢ɻ
Replicaͷੜ • ҙͷWorkloads ResourceΛ༻͍ͯɺ[1. Podͷ࡞]Ͱ࡞ͨ͠podΛ 4 replicaͷϦιʔεͱͯ͠࡞͍ͯͩ͘͠͞ɻ ·ͨɺͦͷWorkloads ResourceΛબͨ͠ཧ༝ʹ͍ͭͯ·ͱΊͯΈ·͠ΐ͏ɻ Workloads
Resource: Pod, ReplicaSet, Deployment, DaemonSet, StatefulSet Updateઓུ • [3. Replicaͷੜ]ʹͯ࡞͞ΕϦιʔεʹ༻͞Ε͍ͯΔnginxͷversionΛ1.17.7 ʹ্͛Α͏ͱߟ͍͑ͯ·͢ɻμϯλΠϜ͕ͳ͍Α͏ʹΞοϓσʔτΛ͢Δʹɺ ɹmanifestʹ͓͍ͯɺͲͷΑ͏ͳ͜ͱΛઃఆ͢Δඞཁ͕͋ΔͰ͠ΐ͏͔ɻ ɹཧ༝ؚΊͯɺmanifestΛߏͯ͠Έ͍ͯͩ͘͞ɻ
ൃද༰ 1. [Replicaͷੜ]ʹ͓͍ͯɺ 1-1. ͲͷWorkloads ResourceΛબͨ͠ͷ͔ 1-2. ͳͥͦΕΛબͨ͠ͷ͔ 2. [Updateઓུ]ʹ͓͍ͯ
2-1. ͲͷΑ͏ͳmanifestΛߏஙͨ͠ͷ͔ 2-2. manifestΛߏங͢Δʹ͋ͨΓɺԿΛߟྀͨ͠ͷ͔ (strategymaxSurge, maxUnavailableͳͲ)