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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.
- Local storage pool management
- Dynamic volume provisioning
- Extended scheduler
- Volume expansion
- Volume snapshot
- Volume metrics
- Raw block volume
- IO Throttling
- Ephemeral inline volume
┌─────────────────────────────────────────────────────────────────────────────┐
│ 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:
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
More details here
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