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KubernetesHandson
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Aoi Takahashi
January 31, 2020
Programming
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KubernetesHandson
Aoi Takahashi
January 31, 2020
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Transcript
Kubernetes ϋϯζΦϯ
ࣗݾհ • ͓͍͋(@_a0i) • αΠϘζגࣜձࣾSRE •
Kubernetesͱ
…ͷલʹ
ίϯςφΛຊ൪Ͱ ͏ͱ͖ʹ Ͳ͏͍͏͜ͱ͕ඞཁʁ
ίϯςφΛຊ൪ӡ༻͢Δࡍ Γͨ͘ͳΔͩΖ͏͜ͱ ɾෳίϯςφΛಉ࣌ʹ্ཱ͍ͪ͛ͨ ɾίϯςφΛԽ͍ͨ͠ ɾωοτϫʔΫΛ্ख͍͜ͱΓ͍ͨ ͳͲͳͲ
͜ΕΒΛ KubernetesͰ ղܾʂ
Kubernetesͱ • ίϯςφΦʔέετϨʔγϣϯπʔϧ • ଞʹDocker ComposeDocker Swarm • ෳίϯςφΛຊ൪ӡ༻͢ΔͨΊʹཉ͍͠ɺ ඞཁͳػೳΛ৭ʑऔΓἧ͍͑ͯΔ
Kubernetesͷಛ
Kubernetesͷಛ • એݴܕͰ͋Δ • ࣗݾճ෮ੑ • ImmutableͰ͋Δ
એݴܕͰ͋Δ
એݴܕͰ͋Δɺͱ • એݴܕ⁶खଓ͖ܕ • ঢ়ଶΛʮએݴʯ͢Δ • Kubernetesએݴ͞Εͨঢ়ଶʹۙ͘Α͏ಈ͘ ʢReconcile)
એݴܕͱ
ࣗݾճ෮ੑ
Kubernetesͷࣗݾճ෮ੑ • એݴܕͰ͋Δɺ͜ͱͷ݁ՌͰ͋Δ • Ήঢ়ଶΛએݴ͓ͯ͘͠ͱɺ్தͰো͕ى͖ ͯԿΛ͢Ε͍͍͔Kubernetes͕উखʹ அ͢Δ • खଓ͖ܕA→B→Cͷ్தͰো͕ى͖ͨΒ ࠶։͢Δͱ͜Ζ͔Βࢦࣔ͠ͳ͚Ε͍͚ͳ͍
DeploymentͰ࡞ͨ͠PodΛফ͢
Immutable
ैདྷͷΠϯϑϥ • αʔόʔΛ্ཱͪ͛ɺιϑτΣΞΛΞο ϓσʔτ͢Δӡ༻ͩͬͨ • ৭ʑͳਓ͕ӡ༻ʹؔΘΓɺஈʑԿ͕Ͳ͏ͳͬ ͍ͯΔ͔Θ͔Βͳ͘ͳ͍ͬͯ͘
ImmutableͳγεςϜ • ຖճ৽͘͠αʔόʔΛ࡞Δ • ৽نίϯςφΠϝʔδΛݩʹίϯςφΛ࡞ Γ͢
Kubernetesͷ ΞʔΩςΫνϟʔ
ਤࢀরɿIUUQTCMPHIFQUJPDPNDPSFLVCFSOFUFTKB[[JNQSPWPWFSPSDIFTUSBUJPOBFBDB
Ϧιʔεͷઆ໌
KubernetesͷදతϦιʔε • Node • Pod • Deployment • Service
Node • ίϯςφΛσϓϩΠ͢Δαʔόʔ • ཧɺԾΘͳ͍
Pod • KubernetesͰσϓϩΠ͢Δ୯Ґ • Ϋδϥͷ܈ΕΛPodͱ͍͏ • PodʹෳίϯςφͤΔ͜ͱ͕Ͱ͖Δ
Deployment • ࢦఆͨ͠PodͷΛҡ࣋͠ଓ͚ΔͨΊͷ ReplicaSetΛཧ͢Δ • ReplicaSetΛ࡞͢Δ͜ͱͰ͖Δ͕ɺجຊ DeploymentΛར༻͢Δ • ϩʔϧόοΫϩʔϦϯάΞοϓσʔτʹର Ԡ
Service • Pod֎͔ΒPodʹΞΫηε͢ΔͨΊʹར༻͢Δ Ϧιʔε
ࢀߟࢿྉ
ϦϯΫ • Kubectl cheat sheet • https://kubernetes.io/docs/reference/kubectl/cheatsheet/