Kubernetes Wakaran Tokyo #1にて扱う問題です。
Kubernetes Wakaran Tokyo #1Discussion Theme
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Prerequisite Knowledge
What’s Kubernetes• ίϯςφԽ͞ΕͨΞϓϦέʔγϣϯαʔϏεΛཧ͢ΔͨΊͷΦʔϓϯιʔεϓϥοτϑΥʔϜϩʔϦϯάΞοϓσʔτεέʔϦϯά / ΦʔτεέʔϦϯάίϯςφͷࢮ׆ࢹো࣌ͷηϧϑώʔϦϯάetc…
What’s Container• ಉ͡OS্Ͱ͞ΕͨίϯςφۭؒΛ༻ҙ͠ɺݸʑʹΞϓϦέʔγϣϯϥΠϒϥϦΛಈ͔͢͜ͱ͕Ͱ͖Δɻ• ΞϓϦέʔγϣϯʹՃ͑ͯɺOS ͱͦͷؔ࿈πʔϧ͕༰ྔʹؚ·ΕΔVMͱൺֱ͢ΔͱϦιʔε໘Ͱͷܰྔੑɺىಈεϐʔυͷ͞ͳͲͷϝϦοτ͕͋Δଞɺϝϯςφϯεͷ؆қԽ༷ʑͳར͕͋Δɻཧαʔό ཧαʔόϗετOS ϋΠύʔόΠβʔԾԽSW ήετOS ήετOSήετOSήετOSappappapp appapp app appཧαʔόίϯςφΤϯδϯVM Container
What’s Pod• KubernetesͰ࡞͓ΑͼཧͰ͖ΔɺσϓϩΠՄೳͳ࠷খͷίϯϐϡʔςΟϯά୯Ґɻ• 1ͭҎ্ͷίϯςφͰߏ͞ΕΔɻ• Podʹ1ͭͷNic͕༩͑ΒΕɺίϯςφؒͰͦͷ1ͭͷNicΛڞ༗͢Δɻ
Today’s Topic1-1. Podͷ࡞1-2. Serviceͷ࡞1-3. Replicaͷੜ~ ൃల ~2-1. Updateઓུ
Podͷ࡞ྡͷmanifestʹҎԼͷࣄ߲Λهͯ͠ɺPodΛ࡞͠·͠ΐ͏• Container name: nginx• Image: nginx (version 1.17.5)• Port: 80
Serviceͷ࡞ྡͷmanifestΛ༻͍ͯɺService Λ࡞͠·͢ɻͦͷޙɺlocalhost:30080ʹΞΫηεͯ͠ɺҎԼͷΑ͏ͳը໘͕ग़Δ͜ͱΛ֬ೝ͠·͢ɻ
Replicaͷੜ• ҙͷWorkloads ResourceΛ༻͍ͯɺ[1. Podͷ࡞]Ͱ࡞ͨ͠podΛ4 replicaͷϦιʔεͱͯ͠࡞͍ͯͩ͘͠͞ɻ·ͨɺͦͷWorkloads ResourceΛબͨ͠ཧ༝ʹ͍ͭͯ·ͱΊͯΈ·͠ΐ͏ɻWorkloads Resource:Pod, ReplicaSet, Deployment, DaemonSet, StatefulSetUpdateઓུ• [3. Replicaͷੜ]ʹͯ࡞͞ΕϦιʔεʹ༻͞Ε͍ͯΔnginxͷversionΛ1.17.7ʹ্͛Α͏ͱߟ͍͑ͯ·͢ɻμϯλΠϜ͕ͳ͍Α͏ʹΞοϓσʔτΛ͢Δʹɺɹmanifestʹ͓͍ͯɺͲͷΑ͏ͳ͜ͱΛઃఆ͢Δඞཁ͕͋ΔͰ͠ΐ͏͔ɻɹཧ༝ؚΊͯɺmanifestΛߏͯ͠Έ͍ͯͩ͘͞ɻ
ൃද༰1. [Replicaͷੜ]ʹ͓͍ͯɺ1-1. ͲͷWorkloads ResourceΛબͨ͠ͷ͔1-2. ͳͥͦΕΛબͨ͠ͷ͔2. [Updateઓུ]ʹ͓͍ͯ2-1. ͲͷΑ͏ͳmanifestΛߏஙͨ͠ͷ͔2-2. manifestΛߏங͢Δʹ͋ͨΓɺԿΛߟྀͨ͠ͷ͔(strategymaxSurge, maxUnavailableͳͲ)