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Lecture__1.pdf
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ry
February 10, 2020
Education
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300
Lecture__1.pdf
ry
February 10, 2020
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Transcript
Lecture for today’s theme ry (@URyo_0213) 2020/2/10 Kubernetes Wakaran Tokyo
#1
Podͷ࡞ ղ • metadata Podʹ༩͑Δmetadata - Podʹ`nginx`ͱ͍͏໊લ - ֎෦͔ΒͷҹͱͳΔlabel Λ༩͍ͯ͠Δɻ
• spec.containers Containerͷใ Container name: nginx image: nginx (version 1.17.5) exported port: 80
Podͱ • WorkloadsϦιʔεͷ࠷খ୯Ґ • 1ͭҎ্ͷίϯςφ͔Βߏ͞ΕΔ • PodͷίϯςφɺωοτϫʔΫΛڞ༗͢Δ ·ͯΑ… ͲΜͳ࣌ʹPodͷதʹ ෳίϯςφೖΕΔΜͩʁʁʁ
جຊύλʔϯ • αΠυΧʔύλʔϯ • Ξϯόαμύλʔϯ • Ξμϓλύλʔϯ ~ Ԡ༻ ~
• ελοΫɾΪϟβʔ • etc…
جຊύλʔϯ • αΠυΧʔύλʔϯ • Ξϯόαμύλʔϯ • Ξμϓλύλʔϯ ~ Ԡ༻ ~
• ελοΫɾΪϟβʔ • etc…
αΠυΧʔύλʔϯ • PodͷதͰɺmainίϯςφ(ΞϓϦέʔγϣϯ )ͷػೳ֦ு ิॿΛ͢ΔίϯςφΛΈࠐΉύλʔϯ ྫ) αΠυΧʔproxy Proxy App http://10.200.100.20
http://localhost App Pod
Ξϯόαμύλʔϯ • ֎෦ͷαʔϏεͷհͱͳΔίϯςφΛಉҰPodʹ࣋ͭ ύλʔϯ ྫ) γϟʔσΟϯάΞϯόαμ App Ambassador http://localhost:port shard
#3 shard #2 shard #1 App Pod
Ξμϓλύλʔϯ • ֎෦ͷαʔϏε(ࢹLogging)͔Βͷ൚༻తͳΠϯλʔϑΣ ΠεΛఏڙ͢ΔίϯςφΛΈࠐΉύλʔϯ ྫ) Redis Exporter + Prometheus Redis
Adapter - Exporter EternalService - Prometheus
Workloads Ϧιʔεͱ???
Workloads Ϧιʔε • Pod • ReplicaSet • Deployment • DaemonSet
• StatefulSet • Job • CronJob
Workloads Ϧιʔε • Pod • ReplicaSet • Deployment • DaemonSet
• StatefulSet • Job • CronJob
ReplicaSet ࢦఆ͞ΕͨཧͷϨϓϦΧʹ͢ΔͨΊʹPodͷ࡞ ͱআΛߦ͏Ϧιʔε ྫ) replica = 4
ReplicaSet manifest • Selector spec.template.metadata.label Λࢀর͠ɺReplicaΛੜ͢Δର ͷPodΛબ͢Δɻ ɹ(spec.selector.matchLabelsͱ spec.template.labels͕Ұக͠ͳ͍ɹ ɹ߹ɺError͕ग़ͯ࡞͕Ͱ͖ͳ͍)
• templateԼPodͷmanifestͱҰॹ
Deployment DeploymentReplicaSetͷཧΛ͠ɺϩʔϦϯά ΞοϓσʔτϩʔϧόοΫͳͲͷએݴతͳΞοϓ σʔτػೳΛఏڙ ྫ) replica = 4 (RollingUpdateத) Deployment
New Old
Deployment manifest • ReplicaSetͱಉ༷ • UpdateStrategy(spec.strategy) ʹؔͯ͠লུ
DaemonSet ReplicaSetͷಛघܥ ֤Nodeʹ1ͭͣͭஔ͢ΔͨΊɺReplicaͷࢦఆ ͕Ͱ͖ͳ͍ɻ( ஔͨ͘͠ͳ͍Node͕͋Δ߹ɺ Node Anti-AffinityͰ੍ޚՄೳ)
DaemonSet manifest • ReplicaSetͷΑ͏ͳspec.replica͕ ࢦఆͰ͖ͳ͍͕ɺͦΕҎ֎ಉ༷
StatefulSet ReplicaSetͷಛघܥ εέʔϦϯά(ݮΒ࣌͢1൪େ͖͍ΠϯσοΫε ͔Β)ɺPodͷ࡞(1ͭͣͭॱʹ࡞)ͳͲڍಈʹ ҧ͍͕͋Δɻ [ReplicaSet໊] - [ϥϯμϜͳจࣈྻ] [StatefulSet໊] -
[index൪߸] RepliaSet StatefulSet
StatefulSet manifest • جຊReplicaSetͱҰॹ • spec.serviceNameʹͯservice໊ Λࢦఆ͢Δඞཁ͕͋Δɻ
Replicaͷ࡞ ղ • ΞϓϦέʔγϣϯΛಈ͔͢ࡍɺ DBͱҧ͍ɺॊೈͳΞοϓ σʔτͷઓུΛऔΓ͍ͨɻ (× StatefulSet, DaemonSet) •
ϦιʔεΛߟྀͨ͠Nodeஔ ͕ඞཁʹͳΔɻ (× DaemonSet) ΑͬͯDeploymentΛબ