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Cloud Native Storage Meetup #1 Longhorn

5da4f70462de256a566e68adfbb3ca03?s=47 Wenhan Shi
September 17, 2021

Cloud Native Storage Meetup #1 Longhorn

5da4f70462de256a566e68adfbb3ca03?s=128

Wenhan Shi

September 17, 2021
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  1. © Copyright 2021 Rancher. All Rights Reserved. 1 © Copyright

    2021 Rancher. All Rights Reserved. 1 Cloud Native Storage Meetup #1 Longhorn 17th Sep 2021 Wenhan Shi Support Engineer
  2. © Copyright 2021 Rancher. All Rights Reserved. 2 ⾃⼰紹介 •

    施 ⽂翰 (シ ブンカン) Wenhan Shi • 経歴 • ⽇⽴製作所 - Linux カーネルモジュールの保守サポート • Red Hat K.K. - GlusterFS/OpenShift サポート • Canonical Japan K.K. - Ubuntu/OpenStack/Kubernetes サポート • Rancher Lab -> SUSE - Rancher及び周辺製品のサポート @shi_wenhan wenhan.shi@suse.com
  3. © Copyright 2021 Rancher. All Rights Reserved. 3 Open Source

    Distributed Block Storage Software for Kubernetes https://longhorn.io/
  4. © Copyright 2021 Rancher. All Rights Reserved. 4 Longhorn Web

    UI
  5. © Copyright 2021 Rancher. All Rights Reserved. 5 5 •

    volume rebuildの仕組み • v1.2.0の紹介
  6. © Copyright 2021 Rancher. All Rights Reserved. 6 6 •

    volume rebuildの仕組み • v1.2.0の紹介
  7. © Copyright 2021 Rancher. All Rights Reserved. 7 Longhorn Web

    UI • Volumeの各コピーのStatusが確認できる • データは各ノードの /var/lib/longhorn に保存
  8. © Copyright 2021 Rancher. All Rights Reserved. 8 アーキテクチャー

  9. © Copyright 2021 Rancher. All Rights Reserved. 9 アーキテクチャー Engine

    (Data Plane) Manager (Control Plane)
  10. © Copyright 2021 Rancher. All Rights Reserved. 10 アーキテクチャー Worker

    node Longhorn node Longhorn node Pod Engine manager pod Pod Replica Manager Pod Replica Manager Pod Engine Process Replica Process Engine Process Replica Process Ext4/xfs Ext4/xfs Replica Process Ext4/xfs Replica Process Ext4/xfs PVC/PV Volume PVC/PV Volume Longhorn Manager (DS) Longhorn Manager (DS) Longhorn Manager (DS)
  11. © Copyright 2021 Rancher. All Rights Reserved. 11 エラーが突然やってくる msg="pvc-c2a86740-04cb-4982-9d41-f86e07570d5e-e-254bed26:

    time="2021-08-22T22:13:30Z" level=error msg="Setting replica tcp://10.42.6.168:10075 to ERR due to: r/w timeout""
  12. © Copyright 2021 Rancher. All Rights Reserved. 12 アーキテクチャー Worker

    node Longhorn node Longhorn node Pod Engine manager pod Pod Replica Manager Pod Replica Manager Pod Engine Process Replica Process Engine Process Replica Process Ext4/xfs Ext4/xfs Replica Process Ext4/xfs Replica Process Ext4/xfs PVC/PV Volume PVC/PV Volume Longhorn Manager (DS) Longhorn Manager (DS) Longhorn Manager (DS) msg="Prepare to delete instance pvc-c2a86740- 04cb-4982-9d41- f86e07570d5e-r-cd767c21"
  13. © Copyright 2021 Rancher. All Rights Reserved. 13 その後は •

    ディスク上のDataはまだ利用可能 • 新しいプロセスを作成 • 差分だけコピー • dead -> online Longhorn node Replica Manager Pod Replica Process Replica Process Ext4/xfs Ext4/xfs Longhorn Manager (DS) Worker node Pod Engine manager pod Pod Engine Process Engine Process PVC/PV Volume PVC/PV Volume Longhorn Manager (DS) Replica Process
  14. © Copyright 2021 Rancher. All Rights Reserved. 14 その後は •

    replica-replenishment-wait-interval (600s) 後でも回復不可 • 新しいプロセスを作成 • 健康状態のレプリカからフルコピー • dead -> online Longhorn node Replica Manager Pod Replica Process Replica Process Ext4/xfs Ext4/xfs Longhorn Manager (DS) Worker node Pod Engine manager pod Pod Engine Process Engine Process PVC/PV Volume PVC/PV Volume Longhorn Manager (DS) Replica Process Ext4/xfs
  15. © Copyright 2021 Rancher. All Rights Reserved. 15 15 •

    volume rebuildの仕組み • v1.2.0の紹介
  16. © Copyright 2021 Rancher. All Rights Reserved. 16 https://github.com/longhorn/longhorn/releases/tag/v1.2.0 Latest

    release: Longhorn 1.2.0
  17. © Copyright 2021 Rancher. All Rights Reserved. 17 v1.2.0 Hightlight

    • #1815 - [FEATURE] Support CSI volume cloning • Cloning support for the longhorn CSI driver • #1859 Volume Encryption / #902 backup encryption • #587 automatic rebalance the replicas • automatically check if a new replica can be scheduled on the new node to restore the redundancy. • #2206 Enhance Longhorn data plane on low performance enviroment
  18. © Copyright 2021 Rancher. All Rights Reserved. 18 v1.2.0 knownissue

    • #2964 [BUG] Longhorn 1.2.0 - wrong volume permissions inside container / broken fsGroup • Issue: Will get a Permission denied when access the folder. • WA: Add a --default-fstype=ext4 to the csi-provisioner container • Will be fixed in v1.2.1, which is scheduled to be released at September 24, 2021 ... containers: - args: - --v=2 - --csi-address=$(ADDRESS) - --timeout=1m50s - --leader-election - --leader-election-namespace=$(POD_NAMESPACE) - --default-fstype=ext4 env: ...
  19. © Copyright 2021 Rancher. All Rights Reserved. 19 Information •

    Homepage • https://longhorn.io/ • Documentation • https://longhorn.io/docs/ • Roadmap • https://github.com/longhorn/longhorn/wiki/Roadmap • Development updates • https://github.com/longhorn/longhorn/milestones/
  20. © Copyright 2021 Rancher. All Rights Reserved. 20 20 Thank

    you