Hello, I want share the cluster volume management installation using Longhorn documentation here.

## Table of Contents
1. Reference
2. Prequisites
3. Installation
4. Access with Ingress

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### Reference
The installation based on the reference below:
https://longhorn.io/docs/1.5.3

---

### Prequisites
The longhorn must fulfill requirements in every worker node. The requirements can check automatically using by run the bash script in every worker node

$ curl -sSfL $ https://raw.githubusercontent.com/longhorn/longhorn/v1.5.3/scripts/environment_check.sh | bash

The output example if the bash script met all the requirements
> [INFO] Required dependencies 'kubectl jq mktemp sort printf' are installed.
[INFO] All nodes have unique hostnames.
[INFO] Waiting for longhorn-environment-check pods to become ready (0/3)...
[INFO] All longhorn-environment-check pods are ready (3/3).
[INFO] MountPropagation is enabled
[INFO] Checking kernel release...
[INFO] Checking iscsid...
[INFO] Checking multipathd...
[INFO] Checking packages...
[INFO] Checking nfs client...
[INFO] Cleaning up longhorn-environment-check pods...
[INFO] Cleanup completed.

``

---

### Installation
Longhorn can be installed on a Kubernetes cluster in several ways:
* **Kubectl** (using manifest)
* **Helm** (using values)

I used the kubectl method to install the Longhorn because something will be edited in the manifest file.

The manifest can be downloaded in [this link](https://raw.githubusercontent.com/longhorn/longhorn/v1.5.3/deploy/longhorn.yaml) and the output must redirect into a file.

$ curl https://raw.githubusercontent.com/longhorn/longhorn/v1.5.3/deploy/longhorn.yaml > longhorn.yaml

Edit the manifest.yaml file and change the ***numberOfReplicas*** with the actual number of worker node used

$ sudo nano manifest.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: longhorn-storageclass
  namespace: longhorn-system
  labels:
    app.kubernetes.io/name: longhorn
    app.kubernetes.io/instance: longhorn
    app.kubernetes.io/version: v1.5.3
data:
  storageclass.yaml: |
    kind: StorageClass
    apiVersion: storage.k8s.io/v1
    metadata:
      name: longhorn
      annotations:
        storageclass.kubernetes.io/is-default-class: "true"
    provisioner: driver.longhorn.io
    allowVolumeExpansion: true
    reclaimPolicy: "Delete"
    volumeBindingMode: Immediate
    parameters:
      numberOfReplicas: "2" #  <===== change with number of worker node
      staleReplicaTimeout: "30"
      fromBackup: ""
      fsType: "ext4"
      dataLocality: "disabled"

``

---
### Access the dashboard
We can access the dashboard through Ingress that we can configured before
> [https://longhorn.openetra.net/](http://longhorn.openetra.net/)

Here the dashboard view of Longhorn UI