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# Longhorn
Longhorn is a microservice based distribution storage system.
Longhorn is a distributed block storage system built using the idea of associating every volume with its own storage controller. Each controller functions like a typical mirroring RAID controller. The storage controller and its associated replicas are implemented using containers and are managed using a container orchestration system.
It's in experimental stage now. Comments are welcome!
See [wiki](https://github.com/rancher/longhorn/wiki) for more details.
Longhorn is experimental software. We appreciate your comments as we continue to work on it!
# Requirements
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```
Congratulation! Now you have Longhorn running on the host and can access the UI at `http://<host_ip>:8080`.
#### Setup example NFS server for backupstore
#### Setup a simple NFS server for backup store
Longhorn's backup feature requires an NFS server or an S3 endpoint. You can setup a simple NFS server on the same host and use that to store backups.
```
# Make sure you have nfs-kernel-server package installed.
@ -47,7 +45,7 @@ nfs://10.0.0.5:/opt/backupstore
```
Open Longhorn UI, go to `Setting`, fill the `Backup Target` field with the URL above, click `Save`. Now you should able to use the backup feature of Longhorn.
# Test volume creation and use
# Create Longhorn volume from Docker CLI
You can now create a persistent Longhorn volume from Docker CLI using the Longhorn volume driver and use the volume in Docker containers.
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docker volume create -d longhorn vol1
docker run -it --volume-driver longhorn -v vol1:/vol1 ubuntu bash
```
# Multi-host setup
Single-host setup is not suitable for production use. You can find instructions for multi-host setup here: https://github.com/rancher/longhorn/wiki/Multi-Host-Setup-Guide