自宅サーバーでbottlerocketを動かしてk8sクラスタを組む

by KOBA789

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KOBA789 ࣗ୐αʔόʔͰ bottlerocket Λ  ಈ͔ͯ͠ k8s ΫϥελΛ૊Ή

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https://twitter.com/superbrothers/status/1347431085429329920 ؾܰʹਃ͠ࠐΈ·ͨ͠

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KOBA789 • ύιίϯΦλΫ • ߴଔʢஜ೾େֶதୀʣ • DBMS ͱ෼ࢄγεςϜ͕޷͖ • ࣗ୐αʔόʔ੎ • ࢓ࣄͰ͸Ұ੾ kube ͯ͠ͳ͍ Ͱɺ୭ʁ

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KOBA789 ࣗ୐αʔόʔͰ bottlerocket Λ  ಈ͔ͯ͠ k8s ΫϥελΛ૊Ή ΋͏Ұ౓λΠτϧ

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Bottlerocket ίϯςφϗετ༻ Linux σΟετϦϏϡʔγϣϯ • AWS ੡ • ίϯςφϗετಛԽ • TUF ४ڌͰݎ࿚ͳΞοϓσʔτγεςϜ • ࠷খߏ੒ Amazon Linux + Rust ੡Ϣʔβʔϥϯυ • ެࣜͷίʔυπϦʔͰ͸ EC2 Ͱ͔͠ಈ͔ͳ͍

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ࣗ୐αʔόʔͰಈ͔͍ͨ͠ • EKSͰಈ͔͢ͷ͸؆୯ • eksctl ͰҰܸʢΒ͍͠ʣ • ࣗ୐αʔόʔʢϕΞϝλϧʣͰ͸ OS ͷىಈ͢Βେม • ֨ಆه: https://diary.hatenablog.jp/entry/2020/12/19/192558 • ࠓ೔͸ kubelet Λಈ͔͢ͱ͜Ζͷ࿩

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ಥવͰ͕͢͜͜Ͱ Demo

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Bottlerocket ͷίϯϑΟάγεςϜ ઃఆϑΝΠϧ͸ςϯϓϨʔτͱύϥϝλ͔Βੜ੒ https://github.com/bottlerocket-os/bottlerocket/blob/develop/sources/api/api-system.png consul-template Έ͍ͨͳײ͡

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Bottlerocket ͷίϯϑΟάγεςϜ ͍͔ͭ͘ͷσʔλιʔε • storewolf • OS Πϝʔδʹম͖ࠐ·ΕͯΔσϑΥϧτ஋ • early-boot-con f i g • EC2 Πϯελϯεͷ user-data ͷ஋

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Bottlerocket ͷίϯϑΟάγεςϜ ͍͔ͭ͘ͷσʔλιʔε • storewolf • OS Πϝʔδʹম͖ࠐ·ΕͯΔσϑΥϧτ஋ • early-boot-con f i g • EC2 Πϯελϯεͷ user-data ͷ஋ ࣗ୐αʔόʔͰ࢖͑ΔΘ͚ͳ͍

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ํ਑:   ࣗ୐༻ઃఆΛ OS Πϝʔδʹ   ϋʔυίʔυ

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ϋʔυίʔυ͢Δ΋ͷ ҙ֎ͱগͳ͍ • Ϋϥελ PKI ͷϧʔτূ໌ॻ ca.crt • clusterDNS • clusterDomain ౰વɺϊʔυ͝ͱͷઃఆ͸Ͱ͖ͳ͍

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Q. kubelet ͷΫϥΠΞϯτূ໌ॻ͸   Ͳ͏͢Δͷʁ A. TLS Bootstrap ͢Ε͹͑͑

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ͱ͍͏Θ͚Ͱ Demo

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ϋϚΓϙΠϯτ • volumePluginDir ͕ҧͬͯͯ Calico ্͕͕ͬͯ͜ͳ͍ • bottlerocket Ͱ͸ kubelet σϑΥϧτͷ /usr/libexec ҎԼ͸ read-only • Calico ͷϚχϑΣετΛॻ͖׵͑·͠ΐ͏

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·ͱΊ • kubeadm ͕࢖͑ͳ͍؀ڥ͸ษڧʹͳΔ • Πϯετʔϥࣗ࡞͍ͨ͠ͳΒ  ·ͣ͸ kubeadm ͰΫϥελ૊ΜͰ؍࡯͢Δͱ͍͍ • ΋ͪΖΜίʔυ΋ಡΉͱ͍͍ • bootstrap token ͷड͚౉͕͠खΦϖͳͷ͸ͳΜͱ͔͍ͨ͠ • ࣗ୐ͷ LAN ͷ҆શੑΛͲ͜·Ͱ৴པ͢Δ͔