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Longhorn Storage Provisioner

Longhorn is a lightweight, reliable, and powerful distributed block storage system for Kubernetes.

Longhorn implements distributed block storage using containers and microservices. Longhorn creates a dedicated storage controller for each block device volume and synchronously replicates the volume across multiple replicas stored on multiple nodes. The storage controller and replicas are themselves orchestrated using Kubernetes.

See Documentation for more information

Installation

Simply Run

kubectl apply -f https://raw.githubusercontent.com/longhorn/longhorn/v1.3.1/deploy/longhorn.yaml

To Ensure that Everything is working

kubectl get pods --namespace longhorn-system

It should show something like this

NAME                                       READY   STATUS    RESTARTS   AGE
csi-attacher-5cc849c8dd-7s8xb              1/1     Running   0          77s
csi-attacher-5cc849c8dd-th8gj              1/1     Running   0          77s
csi-attacher-5cc849c8dd-zcfkl              1/1     Running   0          77s
csi-provisioner-74557755-9zlnt             1/1     Running   0          76s
csi-provisioner-74557755-qtc6j             1/1     Running   0          76s
csi-provisioner-74557755-sz7pv             1/1     Running   0          76s
csi-resizer-686bd4b6d7-2sl6c               1/1     Running   0          76s
csi-resizer-686bd4b6d7-v8x6z               1/1     Running   0          76s
csi-resizer-686bd4b6d7-zhfgz               1/1     Running   0          76s
engine-image-ei-eee5f438-276hq             1/1     Running   0          116s
engine-image-ei-eee5f438-284hs             1/1     Running   0          116s
instance-manager-e-64537b18                1/1     Running   0          99s
instance-manager-e-bcb82b09                1/1     Running   0          116s
instance-manager-r-55759702                1/1     Running   0          115s
instance-manager-r-8b0b972c                1/1     Running   0          99s
longhorn-csi-plugin-9w9cv                  2/2     Running   0          76s
longhorn-csi-plugin-jn7m4                  2/2     Running   0          76s
longhorn-driver-deployer-cd74cb75b-m2gpl   1/1     Running   0          2m11s
longhorn-manager-cfxk4                     1/1     Running   0          2m14s
longhorn-manager-p5h2q                     1/1     Running   0          2m14s
longhorn-ui-8486987944-lz8s5               1/1     Running   0          2m12s

If not, you need to wait until all the pods are running

You can confirm that it has been installed using

kubectl get storageclass

and you should see a storage class called longhorn

Make Longhorn the Default Storage Class

First you need to mark the other storage classes if any as non-default. replace $storageclass with the name of the storage class (e.g. nfs-provisioner) and then apply the following

NOTE: you must use bash because of the quotes. otherwise, you have to put a backslash (\) in front of every quote (")

kubectl patch storageclass $storageclass -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'

and then you mark longhorn as the default storage class

kubectl patch storageclass longhorn -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'