mirror of https://git.rancher.io/charts
33 lines
1.6 KiB
Markdown
33 lines
1.6 KiB
Markdown
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# Longhorn Chart
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> **Important**: Please install the Longhorn chart in the `longhorn-system` namespace only.
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> **Warning**: Longhorn doesn't support downgrading from a higher version to a lower version.
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## Source Code
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Longhorn is 100% open source software. Project source code is spread across a number of repos:
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1. Longhorn Engine -- Core controller/replica logic https://github.com/longhorn/longhorn-engine
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2. Longhorn Instance Manager -- Controller/replica instance lifecycle management https://github.com/longhorn/longhorn-instance-manager
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3. Longhorn Share Manager -- NFS provisioner that exposes Longhorn volumes as ReadWriteMany volumes. https://github.com/longhorn/longhorn-share-manager
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4. Longhorn Manager -- Longhorn orchestration, includes CSI driver for Kubernetes https://github.com/longhorn/longhorn-manager
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5. Longhorn UI -- Dashboard https://github.com/longhorn/longhorn-ui
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## Prerequisites
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1. Docker v1.13+
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2. Kubernetes v1.16+
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3. Make sure `curl`, `findmnt`, `grep`, `awk` and `blkid` has been installed in all nodes of the Kubernetes cluster.
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4. Make sure `open-iscsi` has been installed in all nodes of the Kubernetes cluster. For GKE, recommended Ubuntu as guest OS image since it contains `open-iscsi` already.
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## Uninstallation
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To prevent damage to the Kubernetes cluster, we recommend deleting all Kubernetes workloads using Longhorn volumes (PersistentVolume, PersistentVolumeClaim, StorageClass, Deployment, StatefulSet, DaemonSet, etc).
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From Rancher Cluster Explorer UI, navigate to Apps page, delete app `longhorn` then app `longhorn-crd` in Installed Apps tab.
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---
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Please see [link](https://github.com/longhorn/longhorn) for more information.
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