Lecture__1.pdf

1. Lecture for today’s theme ry (@URyo_0213) 2020/2/10 Kubernetes Wakaran Tokyo #1
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
3. Podͱ͸ • WorkloadsϦιʔεͷ࠷খ୯Ґ • 1ͭҎ্ͷίϯςφ͔Βߏ੒͞ΕΔ • Pod಺ͷίϯςφ͸ɺωοτϫʔΫΛڞ༗͢Δ ·ͯΑ… ͲΜͳ࣌ʹPodͷதʹ ෳ਺ίϯςφೖΕΔΜͩʁʁʁ
4. جຊύλʔϯ • αΠυΧʔύλʔϯ • Ξϯόαμύλʔϯ • Ξμϓλύλʔϯ ~ Ԡ༻ ~ • ελοΫɾΪϟβʔ • etc…
5. جຊύλʔϯ • αΠυΧʔύλʔϯ • Ξϯόαμύλʔϯ • Ξμϓλύλʔϯ ~ Ԡ༻ ~ • ελοΫɾΪϟβʔ • etc…
6. αΠυΧʔύλʔϯ • PodͷதͰɺmainίϯςφ(ΞϓϦέʔγϣϯ ౳)ͷػೳ֦ு ΍ิॿΛ͢ΔίϯςφΛ૊ΈࠐΉύλʔϯ ྫ) αΠυΧʔproxy Proxy App http://10.200.100.20 http://localhost App Pod
7. Ξϯόαμύλʔϯ • ֎෦ͷαʔϏεͷ஥հ໾ͱͳΔίϯςφΛಉҰPod಺ʹ࣋ͭ ύλʔϯ ྫ) γϟʔσΟϯάΞϯόαμ App Ambassador http://localhost:port shard #3 shard #2 shard #1 App Pod
8. Ξμϓλύλʔϯ • ֎෦ͷαʔϏε(؂ࢹ΍Logging)͔Βͷ൚༻తͳΠϯλʔϑΣ ΠεΛఏڙ͢ΔίϯςφΛ૊ΈࠐΉύλʔϯ ྫ) Redis Exporter + Prometheus Redis Adapter - Exporter EternalService - Prometheus
9. Workloads Ϧιʔεͱ͸???
10. Workloads Ϧιʔε • Pod • ReplicaSet • Deployment • DaemonSet • StatefulSet • Job • CronJob
11. Workloads Ϧιʔε • Pod • ReplicaSet • Deployment • DaemonSet • StatefulSet • Job • CronJob
12. ReplicaSet ࢦఆ͞Εͨཧ૝ͷϨϓϦΧ਺ʹ͢ΔͨΊʹPodͷ࡞ ੒ͱ࡟আΛߦ͏Ϧιʔε ྫ) replica = 4
13. ReplicaSet manifest • Selector spec.template.metadata.label Λࢀর͠ɺReplicaΛੜ੒͢Δର৅ ͷPodΛબ୒͢Δɻ ɹ(spec.selector.matchLabelsͱ spec.template.labels͕Ұக͠ͳ͍ɹ ɹ৔߹ɺError͕ग़ͯ࡞੒͕Ͱ͖ͳ͍) • templateԼ͸PodͷmanifestͱҰॹ
14. Deployment Deployment͸ReplicaSetͷ؅ཧΛ͠ɺϩʔϦϯά Ξοϓσʔτ΍ϩʔϧόοΫͳͲͷએݴతͳΞοϓ σʔτػೳΛఏڙ ྫ) replica = 4 (RollingUpdateத) Deployment New Old
15. Deployment manifest • ReplicaSetͱಉ༷ • UpdateStrategy(spec.strategy) ʹؔͯ͠͸লུ
16. DaemonSet ReplicaSetͷಛघܥ ֤Nodeʹ1ͭͣͭ഑ஔ͢ΔͨΊɺReplica਺ͷࢦఆ ͕Ͱ͖ͳ͍ɻ( ഑ஔͨ͘͠ͳ͍Node͕͋Δ৔߹ɺ Node Anti-Affinity౳Ͱ੍ޚՄೳ)
17. DaemonSet manifest • ReplicaSetͷΑ͏ͳspec.replica͕ ࢦఆͰ͖ͳ͍͕ɺͦΕҎ֎͸ಉ༷
18. StatefulSet ReplicaSetͷಛघܥ εέʔϦϯά(ݮΒ࣌͢͸1൪େ͖͍ΠϯσοΫε ͔Β)΍ɺPodͷ࡞੒(1ͭͣͭॱʹ࡞੒)ͳͲڍಈʹ ҧ͍͕͋Δɻ [ReplicaSet໊] - [ϥϯμϜͳจࣈྻ] [StatefulSet໊] - [index൪߸] RepliaSet StatefulSet
19. StatefulSet manifest • جຊ͸ReplicaSetͱҰॹ • spec.serviceNameʹͯservice໊ Λࢦఆ͢Δඞཁ͕͋Δɻ
20. Replicaͷ࡞੒ ղ౴ • ΞϓϦέʔγϣϯΛಈ͔͢ࡍɺ DB౳ͱ͸ҧ͍ɺॊೈͳΞοϓ σʔτͷઓུΛऔΓ͍ͨɻ (× StatefulSet, DaemonSet) • Ϧιʔε౳Λߟྀͨ͠Node഑ஔ ౳͕ඞཁʹͳΔɻ (× DaemonSet) ΑͬͯDeploymentΛબ୒