Continental Innovates with Rancher and Kubernetes
Longhorn is a lightweight, reliable and easy-to-use distributed block storage system for Kubernetes.
Longhorn is free, open source software. Originally developed by Rancher Labs, it is now being developed as a sandbox project of the Cloud Native Computing Foundation. It can be installed on any Kubernetes cluster with Helm, with kubectl, or with the Rancher UI. You can learn more about its architecture here.
With Longhorn, you can:
Prior to Rancher v2.5, Longhorn could be installed as a Rancher catalog app. In Rancher v2.5, the catalog system was replaced by the Apps & Marketplace, and it became possible to install Longhorn as an app from that page.
The Cluster Explorer now allows you to manipulate Longhorn’s Kubernetes resources from the Rancher UI. So now you can control the Longhorn functionality with the Longhorn UI, or with kubectl, or by manipulating Longhorn’s Kubernetes custom resources in the Rancher UI.
These instructions assume you are using Rancher v2.5, but Longhorn can be installed with earlier Rancher versions. For documentation about installing Longhorn as a catalog app using the legacy Rancher UI, refer to the Longhorn documentation.
Result: Longhorn is deployed in the Kubernetes cluster.
Result: You will be taken to the Longhorn UI, where you can manage your Longhorn volumes and their replicas in the Kubernetes cluster, as well as secondary backups of your Longhorn storage that may exist in another Kubernetes cluster or in S3.
Result: Longhorn is uninstalled.
The Longhorn project is available here.
The Longhorn documentation is here.
Longhorn creates a dedicated storage controller for each volume and synchronously replicates the volume across multiple replicas stored on multiple nodes.
The storage controller and replicas are themselves orchestrated using Kubernetes.
You can learn more about its architecture here.