Prerequisites

• Your workstation: Install the Argo CD CLI.
• Kubernetes cluster:

  • Ensure that each node fulfills the installation requirements.

  • Install Argo CD.

    kubectl create namespace argocd
    kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/core-install.yaml
    

    Allow some time for the deployment of Argo CD components in the argocd namespace.

Use this script to check the Longhorn environment for potential issues.

Installing Longhorn

1. Log in to Argo CD.

   argocd login --core
   

2. Set the current namespace to argocd.

   kubectl config set-context --current --namespace=argocd
   

3. Create the Longhorn Application custom resource.

   cat > longhorn-application.yaml <<EOF
   apiVersion: argoproj.io/v1alpha1
   kind: Application
   metadata:
     name: longhorn
     namespace: argocd
   spec:
     syncPolicy:
       syncOptions:
         - CreateNamespace=true
     project: default
     sources:
       - chart: longhorn
         repoURL: https://charts.longhorn.io/
         targetRevision: v1.6.1 # Replace with the Longhorn version you'd like to install or upgrade to
         helm:
           values: |
             preUpgradeChecker:
               jobEnabled: false
     destination:
       server: https://kubernetes.default.svc
       namespace: longhorn-system
   EOF
   kubectl apply -f longhorn-application.yaml
   

4. Deploy Longhorn with the configured settings.

   argocd app sync longhorn
   

5. Verify that Longhorn was installed successfully.

   kubectl -n longhorn-system get pod
   

   Example of a successful Longhorn installation:

   NAME                                                READY   STATUS    RESTARTS   AGE
   longhorn-ui-b7c844b49-w25g5                         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-b34d5db1fe1e2d52bcfb308be3166cfc   1/1     Running   0          114s
   engine-image-ei-df38d2e5-cv6nc                      1/1     Running   0          114s
   

6. Create an NGINX Ingress controller with basic authentication to access the Longhorn UI. Authentication to the Longhorn UI is not enabled by default.

7. Access the Longhorn UI.