In this section, you will learn how to install Longhorn with Helm.

Prerequisites

• Each node in the Kubernetes cluster where Longhorn will be installed must fulfill these requirements.
• Helm v2.0+ must be installed on your workstation.
  • 1. Refer to the official documentation for help installing Helm.
  • 2. If you’re using a Helm version prior to version 3.0, you need to install Tiller in your Kubernetes cluster with role-based access control (RBAC).

This script can be used to check the Longhorn environment for potential issues.

Installing Longhorn

Note:

• The initial settings for Longhorn can be found in customized using Helm options or by editing the deployment configuration file.
• For Kubernetes < v1.25, if your cluster still enables Pod Security Policy admission controller, set the helm value enablePSP to true to install longhorn-psp PodSecurityPolicy resource which allows privileged Longhorn pods to start.

1. Add the Longhorn Helm repository:

   helm repo add longhorn https://charts.longhorn.io
   

2. Fetch the latest charts from the repository:

   helm repo update
   

3. Install Longhorn in the longhorn-system namespace.

   To install Longhorn with Helm 2, use the command:

   helm install longhorn/longhorn --name longhorn --namespace longhorn-system --version 1.4.0
   

   To install Longhorn with Helm 3, use the commands:

   helm install longhorn longhorn/longhorn --namespace longhorn-system --create-namespace --version 1.4.0
   

4. To confirm that the deployment succeeded, run:

   kubectl -n longhorn-system get pod
   

   The result should look like the following:

   NAME                                           READY   STATUS    RESTARTS   AGE
   longhorn-ui-b7c844b49-w25g5                    1/1     Running   0          2m41s
   longhorn-conversion-webhook-5dc58756b6-9d5w7   1/1     Running   0          2m41s
   longhorn-conversion-webhook-5dc58756b6-jp5fw   1/1     Running   0          2m41s
   longhorn-admission-webhook-8b7f74576-rbvft     1/1     Running   0          2m41s
   longhorn-admission-webhook-8b7f74576-pbxsv     1/1     Running   0          2m41s
   longhorn-manager-pzgsp                         1/1     Running   0          2m41s
   longhorn-driver-deployer-6bd59c9f76-lqczw      1/1     Running   0          2m41s
   longhorn-csi-plugin-mbwqz                      2/2     Running   0          100s
   csi-snapshotter-588457fcdf-22bqp               1/1     Running   0          100s
   csi-snapshotter-588457fcdf-2wd6g               1/1     Running   0          100s
   csi-provisioner-869bdc4b79-mzrwf               1/1     Running   0          101s
   csi-provisioner-869bdc4b79-klgfm               1/1     Running   0          101s
   csi-resizer-6d8cf5f99f-fd2ck                   1/1     Running   0          101s
   csi-provisioner-869bdc4b79-j46rx               1/1     Running   0          101s
   csi-snapshotter-588457fcdf-bvjdt               1/1     Running   0          100s
   csi-resizer-6d8cf5f99f-68cw7                   1/1     Running   0          101s
   csi-attacher-7bf4b7f996-df8v6                  1/1     Running   0          101s
   csi-attacher-7bf4b7f996-g9cwc                  1/1     Running   0          101s
   csi-attacher-7bf4b7f996-8l9sw                  1/1     Running   0          101s
   csi-resizer-6d8cf5f99f-smdjw                   1/1     Running   0          101s
   instance-manager-r-371b1b2e                    1/1     Running   0          114s
   instance-manager-e-7c5ac28d                    1/1     Running   0          114s
   engine-image-ei-df38d2e5-cv6nc                 1/1     Running   0          114s
   

5. To enable access to the Longhorn UI, you will need to set up an Ingress controller. Authentication to the Longhorn UI is not enabled by default. For information on creating an NGINX Ingress controller with basic authentication, refer to this section.

6. Access the Longhorn UI using these steps.