Lecture__1.pdf

Transcript

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

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

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

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

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

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

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

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9. Workloads Ϧιʔεͱ͸???
   

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

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

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

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

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

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

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17. DaemonSet manifest
    • ReplicaSetͷΑ͏ͳspec.replica͕
    ࢦఆͰ͖ͳ͍͕ɺͦΕҎ֎͸ಉ༷
    

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

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19. StatefulSet manifest
    • جຊ͸ReplicaSetͱҰॹ
    • spec.serviceNameʹͯservice໊
    Λࢦఆ͢Δඞཁ͕͋Δɻ
    

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

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