KubernetesHandson - Speaker Deck

KubernetesHandson

by aoi

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Kubernetes ϋϯζΦϯ

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ࣗݾ঺հ • ͓͍͋(@_a0i) • αΠϘ΢ζגࣜձࣾSRE •

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Kubernetesͱ͸

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…ͷલʹ

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ίϯςφΛຊ൪Ͱ ࢖͏ͱ͖ʹ Ͳ͏͍͏͜ͱ͕ඞཁʁ

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ίϯςφΛຊ൪ӡ༻͢Δࡍ ΍Γͨ͘ͳΔͩΖ͏͜ͱ ɾෳ਺ίϯςφΛಉ࣌ʹ্ཱ͍ͪ͛ͨ ɾίϯςφΛ৑௕Խ͍ͨ͠ ɾωοτϫʔΫΛ্ख͍͜ͱ΍Γ͍ͨ ͳͲͳͲ

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͜ΕΒΛ KubernetesͰ ղܾʂ

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Kubernetesͱ͸ • ίϯςφΦʔέετϨʔγϣϯπʔϧ • ଞʹ΋Docker Compose΍Docker Swarm • ෳ਺ίϯςφΛຊ൪ӡ༻͢ΔͨΊʹཉ͍͠ɺ ඞཁͳػೳΛ৭ʑऔΓἧ͍͑ͯΔ

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Kubernetesͷಛ௃

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Kubernetesͷಛ௃ • એݴܕͰ͋Δ • ࣗݾճ෮ੑ • ImmutableͰ͋Δ

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એݴܕͰ͋Δ

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એݴܕͰ͋Δɺͱ͸ • એݴܕ⁶खଓ͖ܕ • ঢ়ଶΛʮએݴʯ͢Δ • Kubernetes͸એݴ͞Εͨঢ়ଶʹۙ͘Α͏ಈ͘ ʢReconcile)

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એݴܕͱ͸

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ࣗݾճ෮ੑ

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Kubernetesͷࣗݾճ෮ੑ • એݴܕͰ͋Δɺ͜ͱͷ݁ՌͰ΋͋Δ • ๬Ήঢ়ଶΛએݴ͓ͯ͘͠ͱɺ్தͰো֐͕ى͖ ͯ΋ԿΛ͢Ε͹͍͍͔͸Kubernetes͕উखʹ ൑அ͢Δ • खଓ͖ܕ͸A→B→Cͷ్தͰো֐͕ى͖ͨΒ ࠶։͢Δͱ͜Ζ͔Βࢦࣔ͠ͳ͚Ε͹͍͚ͳ͍

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DeploymentͰ࡞੒ͨ͠PodΛফ͢

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Immutable

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ैདྷͷΠϯϑϥ • αʔόʔΛ্ཱͪ͛ɺ౎౓ιϑτ΢ΣΞΛΞο ϓσʔτ͢Δӡ༻ͩͬͨ • ৭ʑͳਓ͕ӡ༻ʹؔΘΓɺஈʑԿ͕Ͳ͏ͳͬ ͍ͯΔ͔Θ͔Βͳ͘ͳ͍ͬͯ͘

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ImmutableͳγεςϜ • ຖճ৽͘͠αʔόʔΛ࡞Δ • ৽نίϯςφΠϝʔδΛݩʹίϯςφΛ࡞ Γ௚͢

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Kubernetesͷ ΞʔΩςΫνϟʔ

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ਤࢀরɿIUUQTCMPHIFQUJPDPNDPSFLVCFSOFUFTKB[[JNQSPWPWFSPSDIFTUSBUJPOBFBDB

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Ϧιʔεͷઆ໌

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Kubernetesͷ୅දతϦιʔε • Node • Pod • Deployment • Service

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Node • ίϯςφΛσϓϩΠ͢Δαʔόʔ • ෺ཧɺԾ૝໰Θͳ͍

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Pod • KubernetesͰσϓϩΠ͢Δ୯Ґ • Ϋδϥͷ܈ΕΛPodͱ͍͏ • Podʹ͸ෳ਺ίϯςφ৐ͤΔ͜ͱ͕Ͱ͖Δ

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Deployment • ࢦఆͨ͠Podͷ਺Λҡ࣋͠ଓ͚ΔͨΊͷ ReplicaSetΛ؅ཧ͢Δ • ReplicaSetΛ࡞੒͢Δ͜ͱ΋Ͱ͖Δ͕ɺجຊ DeploymentΛར༻͢Δ • ϩʔϧόοΫ΍ϩʔϦϯάΞοϓσʔτʹର Ԡ

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Service • Pod֎͔ΒPodʹΞΫηε͢ΔͨΊʹར༻͢Δ Ϧιʔε

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ࢀߟࢿྉ

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ϦϯΫ • Kubectl cheat sheet • https://kubernetes.io/docs/reference/kubectl/cheatsheet/