https://github.com/blampe/longhorn-scheduler

A Kubernetes scheduler for data locality with Longhorn volumes.
https://github.com/blampe/longhorn-scheduler

Last synced: 16 days ago
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A Kubernetes scheduler for data locality with Longhorn volumes.

• Host: GitHub
• URL: https://github.com/blampe/longhorn-scheduler
• Owner: blampe
• License: apache-2.0
• Created: 2023-02-23T22:11:32.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-04-30T19:26:00.000Z (9 months ago)
• Last Synced: 2024-06-21T08:12:11.007Z (7 months ago)
• Language: Go
• Homepage:
• Size: 428 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# 🐮 longhorn-scheduler

This is a fork of [linstor-scheduler-extender] modified to work with [Longhorn]

volumes. It uses [Stork] to schedule pods alongside existing replicas for

optimal performance.

This is in contrast to Longhorn's built-in [data locality] functionality, which

only affects pods that have already been scheduled, and which re-allocates

replicas to achieve locality.

## Behavior

Scheduling is best-effort -- if no replica nodes have capacity the pod will be

scheduled without locality.

In situations where a pod has multiple Longhorn volumes attached, preference is

given to nodes with more replicas.

RWX volumes will attempt to schedule pods on the same node as the NFS share

manager, but the share manager may not have data locality _unless_ the admission

controller is also deployed (see below).

## Deployment

```

kubectl apply -f deploy/longhorn-scheduler.yaml

```

## Usage

Use `schedulerName: longhorn` in your pod spec to take advantage of the

scheduler.

## Admission controller

You can also deploy the admission controller to automatically assign

`schedulerName: longhorn` to all pods with Longhorn volumes:

```

kubectl apply -f deploy/longhorn-scheduler-admission.yaml

```

[linstor-scheduler-extender]: https://github.com/piraeusdatastore/linstor-scheduler-extender

[Longhorn]: http://longhorn.io

[Stork]: https://github.com/libopenstorage/stork

[data locality]: https://longhorn.io/docs/1.4.0/high-availability/data-locality/#data-locality-settings