Lecture__1.pdf - Speaker Deck

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Lecture for today’s theme ry (@URyo_0213) 2020/2/10 Kubernetes Wakaran Tokyo #1

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Podͷ࡞੒ ղ౴ • metadata Podʹ༩͑Δmetadata - Podʹ`nginx`ͱ͍͏໊લ - ֎෦͔Βͷ໨ҹͱͳΔlabel Λ෇༩͍ͯ͠Δɻ • spec.containers Containerͷ৘ใ Container name: nginx image: nginx (version 1.17.5) exported port: 80

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Podͱ͸ • WorkloadsϦιʔεͷ࠷খ୯Ґ • 1ͭҎ্ͷίϯςφ͔Βߏ੒͞ΕΔ • Pod಺ͷίϯςφ͸ɺωοτϫʔΫΛڞ༗͢Δ ·ͯΑ… ͲΜͳ࣌ʹPodͷதʹ ෳ਺ίϯςφೖΕΔΜͩʁʁʁ

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جຊύλʔϯ • αΠυΧʔύλʔϯ • Ξϯόαμύλʔϯ • Ξμϓλύλʔϯ ~ Ԡ༻ ~ • ελοΫɾΪϟβʔ • etc…

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جຊύλʔϯ • αΠυΧʔύλʔϯ • Ξϯόαμύλʔϯ • Ξμϓλύλʔϯ ~ Ԡ༻ ~ • ελοΫɾΪϟβʔ • etc…

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αΠυΧʔύλʔϯ • PodͷதͰɺmainίϯςφ(ΞϓϦέʔγϣϯ ౳)ͷػೳ֦ு ΍ิॿΛ͢ΔίϯςφΛ૊ΈࠐΉύλʔϯ ྫ) αΠυΧʔproxy Proxy App http://10.200.100.20 http://localhost App Pod

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Ξϯόαμύλʔϯ • ֎෦ͷαʔϏεͷ஥հ໾ͱͳΔίϯςφΛಉҰPod಺ʹ࣋ͭ ύλʔϯ ྫ) γϟʔσΟϯάΞϯόαμ App Ambassador http://localhost:port shard #3 shard #2 shard #1 App Pod

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Ξμϓλύλʔϯ • ֎෦ͷαʔϏε(؂ࢹ΍Logging)͔Βͷ൚༻తͳΠϯλʔϑΣ ΠεΛఏڙ͢ΔίϯςφΛ૊ΈࠐΉύλʔϯ ྫ) Redis Exporter + Prometheus Redis Adapter - Exporter EternalService - Prometheus

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Workloads Ϧιʔεͱ͸???

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Workloads Ϧιʔε • Pod • ReplicaSet • Deployment • DaemonSet • StatefulSet • Job • CronJob

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Workloads Ϧιʔε • Pod • ReplicaSet • Deployment • DaemonSet • StatefulSet • Job • CronJob

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ReplicaSet ࢦఆ͞Εͨཧ૝ͷϨϓϦΧ਺ʹ͢ΔͨΊʹPodͷ࡞ ੒ͱ࡟আΛߦ͏Ϧιʔε ྫ) replica = 4

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ReplicaSet manifest • Selector spec.template.metadata.label Λࢀর͠ɺReplicaΛੜ੒͢Δର৅ ͷPodΛબ୒͢Δɻ ɹ(spec.selector.matchLabelsͱ spec.template.labels͕Ұக͠ͳ͍ɹ ɹ৔߹ɺError͕ग़ͯ࡞੒͕Ͱ͖ͳ͍) • templateԼ͸PodͷmanifestͱҰॹ

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Deployment Deployment͸ReplicaSetͷ؅ཧΛ͠ɺϩʔϦϯά Ξοϓσʔτ΍ϩʔϧόοΫͳͲͷએݴతͳΞοϓ σʔτػೳΛఏڙ ྫ) replica = 4 (RollingUpdateத) Deployment New Old

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Deployment manifest • ReplicaSetͱಉ༷ • UpdateStrategy(spec.strategy) ʹؔͯ͠͸লུ

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DaemonSet ReplicaSetͷಛघܥ ֤Nodeʹ1ͭͣͭ഑ஔ͢ΔͨΊɺReplica਺ͷࢦఆ ͕Ͱ͖ͳ͍ɻ( ഑ஔͨ͘͠ͳ͍Node͕͋Δ৔߹ɺ Node Anti-Afﬁnity౳Ͱ੍ޚՄೳ)

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DaemonSet manifest • ReplicaSetͷΑ͏ͳspec.replica͕ ࢦఆͰ͖ͳ͍͕ɺͦΕҎ֎͸ಉ༷

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StatefulSet ReplicaSetͷಛघܥ εέʔϦϯά(ݮΒ࣌͢͸1൪େ͖͍ΠϯσοΫε ͔Β)΍ɺPodͷ࡞੒(1ͭͣͭॱʹ࡞੒)ͳͲڍಈʹ ҧ͍͕͋Δɻ [ReplicaSet໊] - [ϥϯμϜͳจࣈྻ] [StatefulSet໊] - [index൪߸] RepliaSet StatefulSet

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StatefulSet manifest • جຊ͸ReplicaSetͱҰॹ • spec.serviceNameʹͯservice໊ Λࢦఆ͢Δඞཁ͕͋Δɻ

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Replicaͷ࡞੒ ղ౴ • ΞϓϦέʔγϣϯΛಈ͔͢ࡍɺ DB౳ͱ͸ҧ͍ɺॊೈͳΞοϓ σʔτͷઓུΛऔΓ͍ͨɻ (× StatefulSet, DaemonSet) • Ϧιʔε౳Λߟྀͨ͠Node഑ஔ ౳͕ඞཁʹͳΔɻ (× DaemonSet) ΑͬͯDeploymentΛબ୒