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明日から使える(?)逆引きKubernetes
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Aya (Igarashi) Ozawa
November 02, 2022
Technology
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明日から使える(?)逆引きKubernetes
TechFeed Experts Night #7
https://techfeed.io/events/techfeed-experts-night-7
Aya (Igarashi) Ozawa
November 02, 2022
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Transcript
໌͔Β͑Δ(?)ٯҾ͖Kubernetes Aya Igarashi (@Ladicle), SWE at CloudNatix TechFeed Experts Night
#7
? օ͞ΜɺͲͷΑ͏ʹkubernetesͱٔΕͯ·͔͢ʁ
Outline 1. Resource 1. ҙͷϑΟʔϧυΛwatch͢Δ 2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ 3. ϦιʔεΛ࿈ଓͯ͠ૢ࡞͢Δ 2.
Cluster 1. ݕূ༻ΫϥελΛ༻ҙ͢Δ 2. ૢ࡞͢ΔΫϥελΛΓସ͑Δ 3. PrometheusܗࣜͷmetricsΛJSONͱͯ͠ѻ͏ 1. KindͰखݩͷmain.goΛಈ࡞֬ೝ͢Δ 2. ίϯςφΛσόοά͢Δ 3. ίϯςφΠϝʔδͷதΛ֬ೝ͢Δ 3. Development Appendix
whoami? • ϚϧνΫϥυk8sͷίετ࠷ దԽӡ༻ͷࣗಈԽαʔϏεΛ ఏڙ͢ΔUSͷձࣾͰ͢ • ຊ͔ΒҰॹʹಇ͍ͯ͘ΕΔਓ ΛืूதͰ͢! GitHub &
Twitter: @Ladicle • Stream Deck ͓͢͢Ί • खݩʹiPad͋Δͱϖϯλϒ෩ ʹ͑ͯศར SWE at CloudNatix ࠨखσόΠεͷ͢ʍΊ
JsonPathܗࣜͰࢦఆͰ͖Δ 1-1. ҙͷϑΟʔϧυΛwatch͢Δ
1-1. ҙͷϑΟʔϧυΛwatch͢Δ file͔ΒಡΊΔ
1-2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ
1-2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ デフォルトバージョン
1-2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ 複数バージョンが提供されてい るパターン
1-2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ
1-2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ
1-2. ࢦఆͨ͠όʔδϣϯͷϦιʔεΛget͢Δ デフォルトv2 明示的に指定したv1
1-3. ϦιʔεΛ࿈ଓͯ͠ૢ࡞͢Δ
2-1. ݕূ༻ΫϥελΛ༻ҙ͢Δ
2-1. ݕূ༻ΫϥελΛ༻ҙ͢Δ con f ig.yaml FeatureGateもシュッと有効にでき る!
2-1. ݕূ༻ΫϥελΛ༻ҙ͢Δ 容量に注意!
2-2. ૢ࡞͢ΔΫϥελΛΓସ͑Δ
2-2. ૢ࡞͢ΔΫϥελΛΓସ͑Δ
2-3.PrometheusܗࣜͷmetricsΛJSONͱͯ͠ѻ͏
2-3.PrometheusܗࣜͷmetricsΛJSONͱͯ͠ѻ͏
3-1. kindͰखݩͷGoίʔυͷڍಈΛ֬ೝ͢Δ
3-1. kindͰखݩͷGoίʔυͷڍಈΛ֬ೝ͢Δ
3-1. kindͰखݩͷGoίʔυͷڍಈΛ֬ೝ͢Δ Downloadできないので ImagePullPolicyに注意!
3-2. ίϯςφΛσόοά͢Δ
3-2. ίϯςφΛσόοά͢Δ Distrolessなどをベースイメー ジに使っているとshがない
3-2. ίϯςφΛσόοά͢Δ Podにデバッグ用のエフェメラ ルコンテナが追加される
3-2. ίϯςφΛσόοά͢Δ Targetフラグ指定したコンテナ とPID Namespaceを共有※
3-2. ίϯςφΛσόοά͢Δ エフェメラルコンテナではない ㅟ ㅟ
3-3. ίϯςφΠϝʔδͷதΛ֬ೝ͢Δ
3-3. ίϯςφΠϝʔδͷதΛ֬ೝ͢Δ 各レイヤの中身
Quick Recap
DemoͰొͨ͠ίϚϯυ yq: https://github.com/mikefarah/yq jiq: https://github.com/ f iatjaf/jiq prom2json: https://github.com/prometheus/prom2json ko:
https://github.com/ko-build/ko k9s: https://github.com/derailed/k9s dive: https://github.com/wagoodman/dive kubectx(&ns): https://github.com/ahmetb/kubectx kind: https://github.com/kubernetes-sigs/kind
͓·͚ KEPs List: https://www.kubernetes.dev/resources/keps/ O ff icial CVE Feed: https://kubernetes.io/docs/reference/issues...
Thank you! GitHub & Twitter: @Ladicle