軽量Kubernetesディストリビューションである"K3s"を支える拡張機能

Helm CLIのインストールが不要で、Helm CRDのみでアプリのライフサイクルを管理する「Helm Controller」を中心に紹介します。

Transcript

1. © Copyright 2020 Rancher Labs. All Rights Reserved. 1
   © Copyright 2020 Rancher Labs. All Rights Reserved. 1
   ܰྔK8sσΟετϦϏϡʔγϣϯͰ͋Δ
   "K3s"Λࢧ͑Δ֦ுػೳ
   2020/09/02
   Cheng
   

   View Slide

2. About me
   Jianqiang Cheng（νΣϯ）
   Field Engineer at Rancher Labs.
   cheng@rancher.com
   cheng@slack.rancher.jp
   ■Favorite technologies:
   Rancher, Kubernetes, AWS, Jenkins.
   ■Certifications:
   

   View Slide

3. © Copyright 2020 Rancher Labs. All Rights Reserved. 3
   K3sͱ͸？
   

   View Slide

4. © Copyright 2020 Rancher Labs. All Rights Reserved. 4
   ΞʔΩςΫνϟ
   

   View Slide

5. © Copyright 2020 Rancher Labs. All Rights Reserved. 5
   Helm Controller
   Helm CLIͷΠϯετʔϧ͕ෆཁͰɺ
   Helm CRDͷΈͰΞϓϦͷϥΠϑα
   ΠΫϧΛ؅ཧ
   Service LB
   ΤοδଆͳͲɺCloud Provider͕ͳ
   ͍؀ڥͰ΋ɺLBλΠϓͷserviceΛ࡞
   ੒Ͱ͖Δػೳ
   Traefik LB
   ܰྔͳIngress ControllerΛఏڙ
   local path
   provisioner
   ϩΧʔϧ؀ڥͰstorageClassͷ
   provisionerΛఏڙ
   K3sͷ֦ுػೳͷ֓ཁ
   

   View Slide

6. © Copyright 2020 Rancher Labs. All Rights Reserved. 6
   Helm Controller
   • Helm͸K8sͷύοέʔδϚωʔδϟʔ
   • k3s Helm Controller͸ɺHelmͷv2ͱv3ͷ྆ํΛαϙʔτ
   • v1.17.0+k3s1Ҏ্ͷόʔδϣϯ͸ɺv3Λαϙʔτ։࢝
   • Helm Controllerͷಛ௃
   • ϢʔβʔମݧΛ޲্
   • K3sͷػೳ֦ு͕؆୯ʹ
   https://helm.sh/docs/faq/#changes-since-helm-2
   

   View Slide

7. © Copyright 2020 Rancher Labs. All Rights Reserved. 7
   Helm Controller࢓૊Έ
   Library:
   https://github.com/rancher/helm-controller
   https://github.com/rancher/klipper-helm
   1. Helm-controller͸master nodeʹ࣮ߦ͞Ε、HelmChart CRDΛlist/watch
   2. CRD͕onChange࣌ʹɺΞϓϦߋ৽༻ͷJobΛ࣮ߦ
   3. Jobʹ͸ɺrancher/kilipper-helmΛίϯςφͰ࣮ߦ
   4. Killper-helm͸ɺ಺ଂͷhelm cliͰChatΛΠϯετʔϧΞοϓσʔτ
   

   View Slide

8. © Copyright 2020 Rancher Labs. All Rights Reserved. 8
   HelmChart CRDͷσϓϩΠํࣜ
   • 「/var/lib/rancher/k3s/server/manifestsʯʹೖ͍ͬͯΔ
   HelmChart͕ࣗಈʹσϓϩΠ͞ΕΔ
   • Kubectl applyʹΑΔHelmChart CRDͷΠϯετʔϧ
   • CRDܦ༝ͰσϓϩΠͨ͠ΞϓϦ͸ɺhelm CLI͔Β΋ૢ
   ࡞Ͱ͖Δ
   

   View Slide

9. © Copyright 2020 Rancher Labs. All Rights Reserved. 9
   Demo
   • ,T্ʹɺHelmChart CRDͰఆٛͨ͠ΞϓϦͷσϓϩΠ
   • ্هͰσϓϩΠͨ͠ΞϓϦΛɺhelm cliͰ؅ཧ
   

   View Slide

10. © Copyright 2020 Rancher Labs. All Rights Reserved. 10
    Helm Controller ·ͱΊ
    • Ϣʔβʔମݧͷ޲্
    • HelmChart CRDにより、機能拡張が簡単になる
    CI/CD integration, etc
    • Helm CLIと互換性がある
    • 利用しているOSSは下記である
    • rancher/helm-controller
    • rancher/kilipper-helm
    

    View Slide

11. © Copyright 2020 Rancher Labs. All Rights Reserved. 11
    

    View Slide

12. © Copyright 2020 Rancher Labs. All Rights Reserved. 12 12
    ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ
    

    View Slide