Open-Local

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Open-Local is a local disk management system composed of multiple components. With Open-Local, using local storage in Kubernetes will be as simple as centralized storage.

Features

• Local storage pool management
• Dynamic volume provisioning
• Extended scheduler
• Volume expansion
• Volume snapshot
• Volume metrics
• Raw block volume
• IO Throttling
• Ephemeral inline volume

Overall Architecture

┌─────────────────────────────────────────────────────────────────────────────┐
│ Master                                                                      │
│                   ┌───┬───┐           ┌────────────────┐                    │
│                   │Pod│PVC│           │   API-Server   │                    │
│                   └───┴┬──┘           └────────────────┘                    │
│                        │ bound                ▲                             │
│                        ▼                      │ watch                       │
│                      ┌────┐           ┌───────┴────────┐                    │
│                      │ PV │           │ Kube-Scheduler │                    │
│                      └────┘         ┌─┴────────────────┴─┐                  │
│                        ▲            │     open-local     │                  │
│                        │            │ scheduler-extender │                  │
│                        │      ┌────►└────────────────────┘◄───┐             │
│ ┌──────────────────┐   │      │               ▲               │             │
│ │ NodeLocalStorage │   │create│               │               │  callback   │
│ │    InitConfig    │  ┌┴──────┴─────┐  ┌──────┴───────┐  ┌────┴────────┐    │
│ └──────────────────┘  │  External   │  │   External   │  │  External   │    │
│          ▲            │ Provisioner │  │   Resizer    │  │ Snapshotter │    │
│          │ watch      ├─────────────┤  ├──────────────┤  ├─────────────┤    │
│    ┌─────┴──────┐     ├─────────────┴──┴──────────────┴──┴─────────────┤GRPC│
│    │ open-local │     │                 open-local                     │    │
│    │ controller │     │             CSI ControllerServer               │    │
│    └─────┬──────┘     └────────────────────────────────────────────────┘    │
│          │ create                                                           │
└──────────┼──────────────────────────────────────────────────────────────────┘
           │
┌──────────┼──────────────────────────────────────────────────────────────────┐
│ Worker   │                                                                  │
│          │                                                                  │
│          ▼                ┌───────────┐                                     │
│ ┌──────────────────┐      │  Kubelet  │                                     │
│ │ NodeLocalStorage │      └─────┬─────┘                                     │
│ └──────────────────┘            │ GRPC                     Shared Disks     │
│          ▲                      ▼                          ┌───┐  ┌───┐     │
│          │              ┌────────────────┐                 │sdb│  │sdc│     │
│          │              │   open-local   │ create volume   └───┘  └───┘     │
│          │              │ CSI NodeServer ├───────────────► VolumeGroup      │
│          │              └────────────────┘                                  │
│          │                                                                  │
│          │                                                 Exclusive Disks  │
│          │                ┌─────────────┐                  ┌───┐            │
│          │ update         │ open-local  │  init device     │sdd│            │
│          └────────────────┤    agent    ├────────────────► └───┘            │
│                           └─────────────┘                  Block Device     │
│                                                                             │
│                                                                             │
└─────────────────────────────────────────────────────────────────────────────┘

Open-Localcontains four types of components:

• Scheduler extender: as an extended component of Kubernetes Scheduler, adding local storage scheduling algorithm
• CSI plugins: providing the ability to create/delete volume, expand volume and take snapshots of the volume
• Agent: running on each node in the K8s cluster, initializing the storage device according to the configuration list, and reporting local storage device information for Scheduler extender
• Controller: getting the cluster initial configuration of the storage and deliver a detailed configuration list to Agents running on each node

Open-Local also includes a monitoring dashboard:

Who uses Open-Local

Open-Local has been widely used in production environments, and currently used products include:

• ACK Distro
• Alibaba Cloud ECP (Enterprise Container Platform)
• Alibaba Cloud ADP (Cloud-Native Application Delivery Platform)
• CNStack Products
• AntStack Plus Products

User guide

More details here

Contact

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License

Apache 2.0 License